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Compressing, condensing and evaporating

Subclass of:

062 - Refrigeration

062056000 - PROCESSES

Patent class list (only not empty are listed)

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Class / Patent application numberDescriptionNumber of patent applications / Date published
062117000 Dividing refrigerant flow, e.g., bypass parallel units 26
062116000 Utilizing motive energy of fluid to compress 2
20100162740REFRIGERATING DEVICE AND METHOD FOR CIRCULATING A REFRIGERATING FLUID ASSOCIATED WITH IT - Refrigerating device formed by a main compressor (07-01-2010
20110094249Pressure Shock-Induced Cooling Cycle - A supersonic cooling system operates by pumping liquid. Because the supersonic cooling system pumps liquid, the compression system does not require the use of a condenser. The compression system utilizes a compression wave. An evaporator of the compression system operates in the critical flow regime where the pressure in an evaporator tube will remain almost constant and then ‘jump’ or ‘shock up’ to the ambient pressure.04-28-2011
Entries
DocumentTitleDate
20090308086REFRIGERANT SYSTEM WITH MULTI-SPEED PULSE WIDTH MODULATED COMPRESSOR - A refrigerant system is provided with a compressor having a motor that is operable at least at two distinct speeds. The pulse width modulation control is provided to cycle a compressor motor operation between its at least two speeds at a specific rate to exactly match thermal load demands in a conditioned space. The present invention reduces cycling and other efficiency losses as have been experienced in the prior art, as well as minimizes cost and may improve reliability. Also, the present invention can be utilized in conjunction with other known unloading techniques.12-17-2009
20130025306TURBO REFRIGERATION UNIT, CONTROL DEVICE THEREFOR, AND CONTROL METHOD THEREFOR - An object is to provide a turbo-refrigeration-unit control device capable of achieving stable operation and reducing the amount of refrigerant. Provided is a control device for controlling a turbo refrigeration unit that includes a centrifugal compressor, a first-non-refrigerant pump for supplying a first non-refrigerant, a condenser that performs heat exchange between the first non-refrigerant and a refrigerant, an expansion valve that expands the refrigerant, a second-non-refrigerant pump for supplying a second non-refrigerant, an evaporator that performs heat exchange between the second non-refrigerant and the refrigerant, a bypass circuit that is used to inject part of the refrigerant from a discharge port of the centrifugal compressor into a suction port of the centrifugal compressor, and a bypass-circuit control valve that controls the flow rate of the refrigerant.01-31-2013
20130025305REFRIGERATION CYCLE APPARATUS AND REFRIGERANT CIRCULATION METHOD - Refrigerating machine oil is reliably returned to a compressor, regardless of whether the oil is miscible or immiscible with a refrigerant. A first refrigerant channel includes a compressor, a condenser, a first flow control valve, a refrigerant storing container, a second flow control valve, and a first evaporator are connected in that order. A refrigerant outlet of the first evaporator is connected to a suction refrigerant inlet of an ejector. A second refrigerant channel includes a compressor and a second evaporator connected in that order. A refrigerant inlet of the second evaporator is connected to a mixed refrigerant outlet of the ejector. A third refrigerant channel branching off from a halfway point of the-a pipe connecting a refrigerant outlet of the radiator and the first flow control valve includes a third flow control valve and a motive refrigerant inlet of the ejector are connected in that order.01-31-2013
20130025304LOADING AND UNLOADING OF COMPRESSORS IN A COOLING SYSTEM - A system and method of loading and unloading a compressor in a cooling system. The method includes detecting a temperature, determining a compressor should be turned on/off to supply/stop supplying cooling based on the temperature, turning the compressor on/off, and opening/closing a plurality of valves when the compressor is turned on/off.01-31-2013
20110192177AIR CONDITIONER AND CONTROL METHOD THEREOF - Disclosed herein are an air conditioner which controls a pressure of a refrigerant of an outdoor unit by adjusting an opening degree of an outdoor expansion valve or an indoor expansion valve, and a control method thereof. The air conditioner measures a pressure of the refrigerant discharged from a compressor during a cooling operation, and raises the pressure of the refrigerant to be higher than a designated pressure by controlling an opening degree of at least one of the outdoor expansion valve and the indoor expansion valve, if the pressure of the refrigerant is lower than the designated pressure. Further, the air conditioner measures the pressure of the refrigerant inhaled into the compressor during a heating operation, and adjusts the pressure of the refrigerant to be lower than a designated pressure by controlling the opening degree of the outdoor expansion valve, if the pressure of the refrigerant is higher than the designated pressure.08-11-2011
20110192176AIR CONDITIONER AND CONTROL METHOD THEREOF - Disclosed herein is a water-source heat-pump type air conditioner in which a receiver is connected to a super-cooler or economizer, and a control method of the air conditioner to reduce the quantity of liquid refrigerant collected in the receiver during a cooling/heating overload operation. When a cooling/heating overload operation occurs, an electric expansion valve associated with the super-cooler or the economizer is opened by a predetermined opening degree, to bypass high-pressure liquid refrigerant collected in the receiver, thereby preventing a rapid pressure increase due to a great quantity of liquid refrigerant collected in the receiver.08-11-2011
20100115974Start-up control method for refrigeration cycle apparatus and refrigeration cycle control apparatus using the same - In a refrigeration cycle apparatus having an expansion mechanism, a method to swiftly generate a pressure difference upstream and downstream of the expansion mechanism of, thereby enhancing the starting performance of the refrigeration cycle apparatus. The apparatus has a compression mechanism, a utilizing-side heat exchange, an expansion mechanism for recovering power, and a heat source-side heat exchanger. The revolution number of the heat source fluid transfer means is made smaller than a target revolution number or the heat source fluid transfer means is stopped during a predetermined time after the compression mechanism is started. When the compression mechanism is started, the pressure difference can be generated upstream and downstream of the expansion mechanism for a short time, the operation of the expansion mechanism does not become unstable, vibration and noise can be prevented, and the refrigeration cycle apparatus can swiftly be started.05-13-2010
20130074529METHOD FOR CONTROLLING VEHICLE CLIMATE CONTROL SYSTEM LOAD - A method for controlling torque of an air conditioner compressor is disclosed. In one example, the air conditioner compressor is a variable displacement compressor. The method may provide may improve vehicle acceleration response while at the same time providing cooling capacity to a vehicle cabin.03-28-2013
20130074530COOLING SYSTEM AND METHOD FOR OPERATING A COOLING SYSTEM - A cooling system for cooling food on board an aircraft includes a cooling circuit adapted to supply cooling energy to at least one cooling station, a refrigerant circulating in the cooling circuit selected such that it is convertible at least partially from the liquid to the gaseous state of aggregation on releasing its cooling energy to the at least one cooling station and subsequently convertible back at least partially to the liquid state of aggregation again by an appropriate pressure and temperature control in the cooling circuit, and a refrigerant container including a receiving space arranged in an interior space of the refrigerant container which receives the refrigerant circulating in the cooling circuit, the receiving space of the refrigerant container connected to the cooling circuit by a flow line for discharging the refrigerant from the receiving space and by a return line for returning the refrigerant into the receiving space.03-28-2013
20120174604REFRIGERATION SYSTEM WITH A DISTRIBUTOR HAVING A FLOW CONTROL MECHANISM AND A METHOD FOR CONTROLLING SUCH A SYSTEM - A method of controlling a refrigeration system with a closed circuit for circulating a refrigerant wherein the closed circuit has a compressor for compressing the refrigerant, a condenser for receiving and condensing at least part of the compressed refrigerant, an evaporator for receiving and evaporating the condensed refrigerant, and a return conduit for returning the refrigerant from the evaporator to the compressor. The evaporator has several evaporator sections with corresponding conduits that may be individually controlled so as to obtain individual refrigeration effects of corresponding individual evaporator sections.07-12-2012
20100162739HEAT EXCHANGER - A chiller including a condenser having a refrigerant-storage vessel in fluid communication with a multichannel heat exchanger is disclosed. The chiller further includes a compressor, an evaporator and an expansion device connected in a refrigerant circuit. The refrigerant-storage vessel provides system volume for pump down operations.07-01-2010
20130031920APPARATUS AND METHOD FOR EVALUATING PERFORMANCE OF CENTRIFUGAL CHILLER - A calculating section 02-07-2013
20100095689VEHICLE AIR CONDITIONER AND METHOD FOR CONTROLLING THE SAME - A vehicle air conditioner that can increase the range of energy-saving operation by stopping an engine without impairing the air conditioning comfort and a method for controlling the vehicle air conditioner are provided. The vehicle air conditioner includes a compressor (04-22-2010
20100095691COOLING STORAGE AND METHOD OF OPERATING THE SAME - PROBLEM TO BE SOLVED: To provide a cooling storage, in which a refrigerant from one compressor is selectively supplied to multiple evaporators respectively disposed in multiple storage rooms having different thermal loads, and prevent any temperature rise of a storage room of higher thermal load.04-22-2010
20090044548TWO-STAGE VAPOR CYCLE COMPRESSOR - A two-stage vapor cycle compressor includes a first stage impeller, a second stage impeller situated adjacent to the first stage impeller, an electric motor running on a pair of foil bearings, a thrust disk including two foil bearings and being positioned between the second stage impeller and the electric motor, and a compressor housing enclosing the first and second stage impeller and the electric motor. A refrigerant vapor compressed by the first stage and second stage impeller flows through an internal passageway formed by the compressor housing and cools the foil bearings and the electric motor. The compressor may be a gravity insensitive, small, and lightweight machine that may be easily assembled at low manufacturing costs. The two-stage vapor cycle compressor may be suitable for, but not limited to, applications in vapor compression refrigeration systems, such as air-conditioning systems, for example, in the aircraft and aerospace industries.02-19-2009
20100326100REFRIGERANT VAPOR COMPRESSION SYSTEM - A refrigerant vapor compression system includes a first compression device, a refrigerant heat rejection heat exchanger, an expansion device, a refrigerant heat absorption heat exchanger, a second compression device, and a refrigerant-to-refrigerant heat exchanger having first refrigerant flow pass, a second refrigerant flow pass and a third refrigerant flow pass, with the second refrigerant flow pass disposed in heat exchange relationship with each of the first refrigerant flow pass and the third refrigerant flow pass. The second refrigerant flow pass is interdisposed in an economizer circuit. The heat transfer interaction between the first and second refrigerant flow passes functions as a subcooler of refrigerant flowing to the refrigerant heat absorption heat exchanger and the heat transfer interaction between the second and third refrigerant flow passes functions as an intercooler of refrigerant passing from the discharge outlet of the second compression device to the suction inlet of the first compression device.12-30-2010
20130086931AIR CONDITIONING APPARATUS AND CONTROL METHOD THEREOF - An air conditioning apparatus and a control method thereof are provided. The air conditioning apparatus includes a first switch valve, a compressor, a decompression element, a second switch valve, a condenser, and an evaporator. The control method of an air conditioning apparatus includes steps of setting a preset temperature, measuring an indoor temperature, and comparing the preset temperature with the indoor temperature. When the indoor temperature is lower than the preset temperature, the first switch valve and the second switch valve are turned on and the compressor is turned off; and when the indoor temperature is higher than the preset temperature, the first switch valve and the second switch valve are turned off and the compressor is turned on.04-11-2013
20130086930REFRIGERATION SYSTEM CONTROLLED BY REFRIGERANT QUALITY WITHIN EVAPORATOR - A method of controlling a refrigeration system having a refrigerant disposed within a circulation loop with a compressor, a condenser and an evaporator, wherein the method includes the steps of (a) compressing the refrigerant within the compressor and cooling the refrigerant within the condenser; (b) flowing the refrigerant to the evaporator; (c) reducing the pressure of the refrigerant within the evaporator; (d) flowing refrigerant from an outlet opening of the evaporator to the compressor; (e) repeating steps (a)-(d); and (f) controlling the flow of refrigerant to the evaporator in step (b) based upon the condition of the refrigerant within the evaporator upstream of the outlet opening.04-11-2013
20120216553METHOD FOR DETERMINING WIRE CONNECTIONS IN A VAPOUR COMPRESSION SYSTEM - A method for determining wire connections in a vapour compression system (08-30-2012
20100269522SYSTEM AND METHOD OF DIAGNOSIS THROUGH DETECTION OF MECHANICAL WAVES IN REFRIGERATION SYSTEMS AND/OR HOUSEHOLD APPLIANCES - The present invention relates to a system and a method of diagnosis for a refrigeration system and/or household appliance which, based on a multiplicity of physical magnitudes detected, determine and inform the operating condition of said refrigeration system and/or of its components. Basically, the magnitudes are divided into two groups, namely: (i) those from which spectral signatures will be generated (magnitudes relating to mechanical vibrations); and (ii) magnitudes from which spectral signatures will not be generated. The spectral signatures are compared with the standard signatures, and the diagnosis is provided Digital based on this comparison. After the operating condition has been diagnosed, it is stored in a database, and a processing record of the system operation is updated. The operating central conditions are made available for viewing, and based on the record viewed, it is possible to determine whether or not the refrigeration system and/or household appliance and the components thereof are malfunctioning or not. The application further describes a compressor whose diagnosis can be determined by the method and system of diagnosis according to the present invention.10-28-2010
20130055740METHOD FOR OPERATING A VAPOUR COMPRESSION SYSTEM - A method for operating a vapour compression system is disclosed. The vapour compression system comprises a compressor, a condenser, at least one expansion device, an evaporator, said evaporator comprising at least two evaporator paths arranged fluidly in parallel, and a distribution device arranged to distribute refrigerant among the evaporator paths. The method comprises the steps of obtaining at least two predefined distribution keys, each distribution key defining a distribution of available refrigerant among the evaporator paths, detecting one or more operational settings of the vapour compression system, selecting one of the at least two predefined distribution keys, based on said detected operational setting(s), and distributing refrigerant among the evaporator paths in accordance with the selected predefined distribution key.03-07-2013
20090031735SYSTEM AND METHOD OF CONTROLLING FLUID FLOW THROUGH A FLUID COOLED HEAT EXCHANGER - A vapor compression cooling system having a control unit adapted to receive working fluid pressure or temperature information to control a condenser cooling fluid control valve to minimize flow changes through the valve.02-05-2009
20090277196APPARATUS AND METHOD FOR MODULATING COOLING - This invention relates to a method and an apparatus for a modulating air conditioning system having increased energy efficiency and greater turndown capabilities. A modulating air conditioning system includes modulating at least one of the following components: a compressor, a compressor driver, a condenser fan, an evaporator fan, an effective evaporator surface area, an effective condenser surface area and/or an expansion device.11-12-2009
20110011108Microprocessor-Controlled Beverage Dispenser - A microprocessor-controlled beverage dispenser is disclosed, which provides a cold plate having disposed therein beverage lines and refrigerant lines. The refrigerant lines may be connected to a cooling or refrigeration system, including a heat exchanger. The beverage lines may be connected to a beverage supply for dispensing a desired beverage. Valves and pressure sensors in the refrigerant line are engaged with a microprocessor. If the temperature falls below a desired value, then the cooling system is shut off. This permits the microprocessor to closely control the temperature of the beverage being dispensed.01-20-2011
20090235678OPERATION AND CONTROL OF TANDEM COMPRESSORS AND REHEAT FUNCTION - A refrigerant system control operates tandem compressors. If one of the monitored system conditions does not change as each of the tandem compressors or associated components is brought on line, then a determination is made that the respective component is malfunctioning. A refrigerant system can also be additionally equipped with other functions and components, such as variable speed drive, economizer circuit, unloader bypass, and reheat circuit. In case of a reheat circuit, the system can consist of single or multiple compressors. The control algorithm can also be updated such that that particular malfunctioning component is eliminated from the operational sequence.09-24-2009
20090235677Cooling Storage Cabinet and Method of Operating Thereof - When an internal temperature of a freezing compartment becomes lower than a lower limit temperature T09-24-2009
20120111040SYSTEM FOR LIMITING PRESSURE DIFFERENCES IN DUAL COMPRESSOR CHILLERS - Systems for limiting pressure differences in dual compressor chillers are provided. To achieve the efficiency benefits of series flow chillers within a single unit, an evaporator and/or a condenser may be partitioned into separate chambers by a baffle. Process fluid may then flow through one chamber of the evaporator and/or condenser prior to entering the other. This configuration creates a pressure differential between chambers which may reduce compressor head and result in greater chiller efficiency. However, to maintain the structural integrity of the evaporator and/or condenser baffle, a system for limiting this pressure differential may be employed. This system may include an evaporator pressure equalization valve, a common liquid line, or an equalizing line between separate liquid lines. Methods of operating dual compressor chillers using these systems are also provided.05-10-2012
20120111039HEAT TRANSFER PROCESSES AND EQUIPMENT FOR INDUSTRIAL APPLICATIONS - Embodiments of the present invention permit the transfer of heat energy from one process fluid to another in an industrial process without the need for an energy field or centralized energy storage. Preferred embodiments include one or more heat transfer modules that draw heat from one process fluid into circulating refrigerant in an evaporator heat exchanger and supply that heat to a different process fluid in a condenser heat exchanger. In some embodiments, adjustments are made to one or more parameters of one or more process fluids to ensure the desired heat transfer is accomplished with the heat transfer module's compressor operating near optimum efficiency.05-10-2012
20120111038VAPOR-COMPRESSION REFRIGERATION APPARATUS WITH BACKUP AIR-COOLED HEAT SINK AND AUXILIARY REFRIGERANT HEATER - Apparatus and method are provided for cooling an electronic component. The apparatus includes a refrigerant evaporator in thermal communication with a component(s) to be cooled, and a refrigerant loop coupled in fluid communication with the evaporator for facilitating flow of refrigerant through the evaporator. The apparatus further includes a compressor in fluid communication with a refrigerant loop, an air-cooled heat sink coupled to the refrigerant evaporator, for providing backup cooling to the electronic component in a backup, air cooling mode, and a controllable refrigerant heater coupled to the heat sink. The refrigerant heater is in thermal communication across the heat sink with refrigerant passing through the refrigerant evaporator, and is controlled in a primary, refrigeration cooling mode to apply an auxiliary heat load to refrigerant passing through the refrigerant evaporator to ensure that refrigerant in the refrigerant loop entering the compressor is in a superheated thermodynamic state.05-10-2012
20120111037VAPOR-COMPRESSION REFRIGERATION APPARATUS WITH REFRGIERANT BYPASS AND CONTROLLED HEAT LOAD - Apparatus and method are provided for cooling an electronic component. The apparatus includes a refrigerant evaporator in thermal communication with the component(s) to be cooled, and a refrigerant loop coupled in fluid communication with the evaporator for facilitating flow of refrigerant through the evaporator. The apparatus further includes a compressor in fluid communication with the refrigerant loop, a refrigerant bypass pipe coupled to the refrigerant loop in parallel fluid communication with the evaporator, and a control valve for controlling refrigerant flow through the evaporator. The control valve is controlled to maintain temperature of the component(s) within a specified temperature range. The apparatus further includes a controllable refrigerant heater associated with the refrigerant bypass pipe for providing an adjustable heat load on refrigerant in the bypass pipe to ensure that refrigerant entering the compressor is in a superheated thermodynamic state.05-10-2012
20120111036COOLANT-BUFFERED, VAPOR-COMPRESSION REFRIGERATION WITH THERMAL STORAGE AND COMPRESSOR CYCLING - Apparatus and method are provided for cooling an electronic component(s). The apparatus includes a coolant-cooled structure in thermal communication with the component(s) to be cooled, and a coolant-to-refrigerant heat exchanger in fluid communication with the coolant-cooled structure via a coolant loop. A thermal buffer unit is coupled in fluid communication with the coolant loop, and a refrigerant loop is coupled in fluid communication with the heat exchanger. The heat exchanger dissipates heat from coolant in the coolant loop to refrigerant in the refrigerant loop. A compressor is coupled in fluid communication with the refrigerant loop and is maintained ON responsive to heat load of the component(s) exceeding a heat load threshold, and is cycled ON and OFF responsive to heat load of the component(s) being below the threshold. The thermal storage unit dampens swings in coolant temperature within the coolant loop during cycling ON and OFF of the compressor.05-10-2012
20120234026HIGH EFFICIENCY REFRIGERATION SYSTEM AND CYCLE - A high efficiency air conditioning and refrigeration system and cycle comprises a vapor compressor and two independent ejectors operatively connected to high and low-pressure sides of the compressor, respectively. The two ejectors reduce the overall pressure ratio of the mechanical vapor compressor resulting in dramatically increased thermodynamic cycle efficiency. As one example of its potential applications for residential, commercial or industrial uses, a 150 ton capacity of a water-cooled chiller designed in accordance with the present invention is predicted to provide the power consumption as low as 0.47 kW/ton, when operated in accordance with the cooling methods of the present invention, which corresponds to 7.47 of Coefficient of Performance (COP).09-20-2012
20100089079COOLING FURNITURE COMPRISING AT LEAST TWO THERMALLY SEPARATE COMPARTMENTS - An item of cooling furniture includes two thermally separate compartments which are associated with respective evaporators. An expansion valve and evaporators are connected in series in a refrigerant circuit. The adjustment valve permits adjustment between different discrete flow coefficients.04-15-2010
20110061410THERMAL ENERGY STORAGE AND COOLING SYSTEM WITH SECONDARY REFRIGERANT ISOLATION - Disclosed are a method and device for a refrigerant-based thermal storage system wherein a condensing unit and an ice-tank heat exchanger can be isolated through a second heat exchanger. The disclosed embodiments provide a refrigerant-based ice storage system with increased reliability, lower cost components, and reduced power consumption compared to non-isolated systems.03-17-2011
20100095690Compressor - A compressor has a housing. A crank is carried by the housing for rotation about a crank axis. A cylinder is defined within the housing and has a proximal portion and a distal portion. The distal portion is smaller in transverse cross-sectional area than is the proximal portion. A piston is held within the housing for reciprocal movement at least partially within the cylinder. The piston also has a distal portion smaller in transverse cross-sectional area than a proximal portion. A connecting rod is pivotally coupled to the crank for relative rotation about a proximal axis and to the piston for relative rotation about a distal axis. A first compression chamber exists in the cylinder distal portion beyond the end of the piston. A second compression chamber exists in the cylinder proximal portion beyond a piston shoulder. The first and second compression chambers are non-series and non-parallel.04-22-2010
20120227425Solar turbo pump - hybrid heating-air conditioning and method of operation - A closed loop system utilizing a solar refrigerant turbocharger and pump in conjunction with a solar collector to operate a heating and cooling system for a building by utilization of a renewable energy source. The liquid pump within the solar turbocharger is used to boost the refrigerant pressures into the solar collector, the refrigerant absorbs heat inside the solar collector and changes phase from a liquid to a vapor. The vapor is expanded across the turbine causing the turbine to spin. The ability of the refrigerant to change phase or flash from a liquid to a vapor is due to the solar energy that is transferred from evacuated tubes into the solar collector manifold and into the refrigerant. The gas is routed to the solar turbo pump turbine to drive the compressor and liquid pump. The resulting fluid gas leaving the turbine is routed to the condenser for normal operation.09-13-2012
20100180610Refrigerant Subcooling in a Vehicle HVAC System - An HVAC system, and a method of operation, for use in a vehicle is disclosed. The HVAC system may comprise: an evaporator having a drain that receives condensate dripping from the evaporator; a refrigerant compressor that receives a refrigerant from the evaporator and compresses the refrigerant; a condenser that receives the refrigerant from the compressor; and a condensate-to-refrigerant heat exchanger that receives the refrigerant from the condenser and the condensate from the drain, whereby the condensate absorbs heat from the refrigerant as the condensate flows through the condensate-to-refrigerant heat exchanger.07-22-2010
20100313582HIGH EFFICIENCY R744 REFRIGERATION SYSTEM AND CYCLE - A high efficiency R744 air conditioning and refrigeration system and cycle comprises a vapor compressor and two independent ejectors operatively connected to high and low-pressure sides of the compressor, respectively. The two ejectors reduce the overall pressure ratio of the mechanical vapor compressor resulting in dramatically increased thermodynamic cycle efficiency. As one example of its potential applications for residential, commercial or industrial uses, a 150 ton capacity of a water-cooled chiller designed in accordance with the present invention is predicted to provide the power consumption as low as 0.47 kW/ton, when operated in accordance with the cooling methods of the present invention, which corresponds to 7.47 of Coefficient of Performance (COP).12-16-2010
20100180611REFRIGERANT DRYER - A method is provided for applying a cover layer (07-22-2010
20100218522OIL RETURN SYSTEM AND METHOD FOR ACTIVE CHARGE CONTROL IN AN AIR CONDITIONING SYSTEM - An active charge control (ACC) in an air conditioner has a first portion of refrigerant passing into a compressor and a second portion held within the ACC. The first portion is substantially vapor and the second portion substantially liquid. Lubricant is included in both portions for lubricating the compressor. A lubricant mechanism includes a heat exchanger having a primary pathway thermally connected with the compressor and a secondary pathway operable between the ACC and the compressor. The secondary pathway transfers the refrigerant second portion to the compressor. The fluid inlet of the compressor retains liquid refrigerant. The secondary pathway delivers the refrigerant and the lubricant from the ACC to the compressor such that heat energy from the primary pathway is transmitted to the liquid refrigerant and lubricant in the secondary pathway evaporating the refrigerant in the secondary pathway such that refrigerant vapor and lubricant are sent to the compressor.09-02-2010
20110283721DIRECT DRIVE SYSTEM WITH BOOSTER COMPRESSOR - A transport refrigeration system with a direct drive compressor arrangement is provided with a variable speed electrically driven booster compressor that operates in series with the direct drive compressor. The speed of the booster compressor is controlled to either boost or decrease the system capacity. The booster compressor also acts to regulate the flow of refrigerant from the evaporator during periods of operation in which the direct drive compressor might otherwise become overloaded.11-24-2011
20110289948 METHOD OF ANALYSING A REFRIGERATION SYSTEM AND A METHOD OF CONTROLLING A REFRIGERATION SYSTEM - A method of analysing a refrigeration system (12-01-2011
20110289947Temperature-controlled beverage dispenser - A temperature-controlled beverage dispenser is disclosed, which provides a cold plate having disposed therein beverage lines and refrigerant lines. The refrigerant lines may be connected to a cooling system, such as a heat exchanger, which is configured to remove heat from the cold plate. The beverage lines may be connected to a beverage supply for dispensing a desired beverage. Valves and a pressure sensor in the refrigerant line are connected to a microprocessor. At regular intervals, the microprocessor closes the valves, waits a short time, and then takes a pressure reading, which corresponds to a temperature. If the temperature falls below a desired value, then the cooling system is shut off. This permits the microprocessor to closely control the temperature of the beverage being dispensed.12-01-2011
20100281894CAPACITY MODULATION OF REFRIGERANT VAPOR COMPRESSION SYSTEM - A carbon dioxide refrigerant vapor compression system and a method of operating that system are provided. The refrigerant vapor compression system includes a compression device, a refrigerant heat rejection heat exchanger and a refrigerant heat absorption heat exchanger disposed in a primary refrigerant circuit, and a compression device unload circuit in parallel refrigerant flow relationship with the primary refrigerant circuit. At full load, the primary refrigerant circuit is open, but the unload circuit is closed. To modulate capacity, a controller alternates operation between a first cycle for a first period of time wherein the primary circuit is open and the unload circuit is closed and a second cycle for a second period of time wherein the primary circuit is closed and the unload circuit is open.11-11-2010
20110214439TANDEM COMPRESSOR OF DIFFERENT TYPES - A refrigerant system having tandem compressors includes at least two compressors of different types. By utilizing the two distinct compressor types, a greater difference in the provided capacity of the two compressors can be achieved at part-load conditions, as well as a particular compressor type can be engaged at specific environmental conditions to provide the most efficient operation of the refrigerant system.09-08-2011
20100101247ADJUSTMENT OF COMPRESSOR OPERATING LIMITS - A refrigerant system includes a compressor that has safe operating limits that are also built into a refrigerant system control to protect the compressor. Under certain conditions, these safe operational limits may be changed to allow the compressor to operate beyond the safety limits at least for a period of time.04-29-2010
20100101248Refrigerant System and Control Method - A refrigerant system is configured to alternatingly run in an economized mode and a standard mode. A control system shifts the refrigerant system between the economized mode and standard mode responsive to a determined efficiency reflecting a combination of at least two of: compressor isentropic efficiency; condenser efficiency; evaporator efficiency; efficiency of hardware mechanically powering the compressor; and a mode-associated cycling efficiency. In a bypass mode, a bypass refrigerant flow from an intermediate port may return to the suction port. Shifting into the bypass mode may be similarly controlled based upon the determined efficiency.04-29-2010
20090113904METHOD FOR CONTROLLING A REFRIGERATOR - A refrigerator control method is disclosed which ensures efficient operation of a compressor. To control a refrigerator including a compressor, a first evaporator and a second evaporator connected to the compressor, and a refrigerant control valve that controls introduction of a refrigerant into the first evaporator and the second evaporator, the refrigerator control method includes operating the compressor, and controlling the opening and closing of the refrigerant control valve, to reduce not only consumption of electricity by the compressor, but also a pressure difference between an entrance and an exit of the compressor upon starting of the compressor.05-07-2009
20120023982WASTE HEAT AIR CONDITIONING SYSTEM - The present disclosure provides for a method and apparatus of providing air conditioning from a waste heat source. A vapor state expander is provided producing mechanical work, and a compressing unit is at least partially operative responsive to the mechanical work output of the vapor state expander. In another exemplary embodiment a second liquid state expander producing mechanical work is further provided, the compressing unit operative further responsive to the mechanical work of the liquid state expander. The apparatus disclosed is further capable of providing backup heating and cooling from an additional power source when the waste heat source is insufficient.02-02-2012
20120023981REFRIGERATOR AND DRIVING METHOD THEREOF - A refrigerator and a driving method thereof are disclosed. The number of vibration of each compressor, evaporation temperature of each evaporator, or an open time of a refrigerant switching valve is detected to determine whether the flow of refrigerant is biased so as to adjust a cooling capability of the compressor or an open value or open time of a refrigerant switching valve, thereby uniformly distributing the refrigerant into first and second evaporators. Accordingly, the refrigerator can be driven with an independent refrigeration cycle corresponding to a load of a freezing chamber or a refrigerating chamber, resulting in reduction of unnecessary power consumption of the refrigerator.02-02-2012
20120023980REFRIGERATOR AND CONTROLLING METHOD OF THE SAME - Disclosed are a refrigerator and a controlling method of the same. A change amount of a refrigerating chamber temperature, or a change amount of a freezing chamber temperature may be calculated per time period, and a load corresponding driving may be executed based on the calculated change amount. This may allow the load corresponding driving to be executed more precisely, reduce power consumption, and enhance stability and efficiency of a system.02-02-2012
20120023979System And Method For Providing Efficient Cooling Within A Test Environment - In certain embodiments, a method for cooling includes providing a controller in communication with an auxiliary cooling unit and a primary refrigeration unit. A first chamber temperature measurement associated with an environmental test chamber is received, and the heat load associated with a target temperature is determined. Based on the first chamber temperature measurement and the heat load, it is determined that the auxiliary cooling unit can sustain the target temperature. In response to the determination, the controller is used to transmit a signal to power on the auxiliary cooling unit and a signal to time out the primary refrigeration unit.02-02-2012
20120023978REFRIGERATOR AND DRIVING METHOD THEREOF - A refrigerator and a driving method thereof are disclosed. A primary compressor and a secondary compressor can form independent cycles together with corresponding evaporators so as to reduce unnecessary power consumption. Also, a backflow prevention valve is installed between the primary and secondary compressors to prevent an increase in pressure of the secondary compressor, or an auxiliary heat exchanger is installed at the outlet side of a second evaporator with high temperature to allow heat exchange of an outlet side pipe of a first evaporator with low temperature so as to shift a load of a freezing chamber into a relatively large refrigerating chamber, thereby improving efficiency of the refrigerator. In addition, an oil separator or an oil collection pipe is installed at the outlet sides of the compressors or an oil balancing pipe and an oil balancing valve are installed between the compressors, so as to uniformly maintain an oil amount between the compressors.02-02-2012
20100083677ECONOMIZED REFRIGERANT SYSTEM UTILIZING EXPANDER WITH INTERMEDIATE PRESSURE PORT - A refrigerant system utilizes an expander, where at least partially expanded refrigerant portion is tapped at the intermediate expansion point and passed through an economizer heat exchanger. In the economizer heat exchanger, the tapped refrigerant further cools refrigerant in a main liquid line. The present invention eliminates the need for a separate dedicated economizer circuit expansion throttling device, by utilizing a single expander to provide this expansion function. This invention also allows for the recovery of the expansion work, otherwise lost in the economizer expansion throttling device. System capacity and efficiency are improved by providing additional thermal potential for the refrigerant expanded (partially or fully) in the expander during more efficient isentropic process. In various embodiments, there may be more than a single economizer circuit, with each of said economizer circuits receiving the tapped refrigerant portions from the expander at different intermediate expansion points.04-08-2010
20100083678REFRIGERANT SYSTEM WITH EXPANDER SPEED CONTROL - A refrigerant system utilizes an expander to expand refrigerant and to drive or assist in driving an associated compressor. By varying the compressor load, the speed of the expander can be adjusted to achieve the desired thermodynamic characteristics of the expanding refrigerant and enhance expander operation.04-08-2010
20110197602HEAT TRANSFER METHOD - The present invention relates to a method of heat transfer by means of a composition containing hydrochlorofluoroolefins. The subject matter of the present invention is more particularly a heat transfer method comprising, successively, a step of evaporation of a coolant fluid, a compression step, a step of condensation of said fluid at a temperature of greater than or equal to 70° C. and a step of expansion of said fluid, characterized in that that coolant fluid comprises at least one hydrochlorofluoroolefin.08-18-2011
20090277197EVAPORATOR APPARATUS AND METHOD FOR MODULATING COOLING - This invention relates to a method and an apparatus for a modulating air conditioning system having increased energy efficiency and greater turndown capabilities. A modulating air conditioning system includes modulating at least one of the following components: a compressor, a compressor driver, a condenser fan, an evaporator fan, an effective evaporator surface area, an effective condenser surface area and/or an expansion device.11-12-2009
20090277195REFRIGERATION SYSTEM INCLUDING A DESICCANT - A refrigeration system for providing conditioned air to a space includes a compressor operable to compress a refrigerant, a condenser configured to receive the refrigerant from the compressor, an expansion device configured to receive the refrigerant from the condenser, a desiccant operable to adsorb moisture from an airflow flowing through the desiccant such that the airflow is substantially dehumidified, and an evaporator assembly configured to receive the refrigerant from the expansion device and the airflow from the desiccant. The evaporator assembly is operable to condition the airflow prior to discharge from the evaporator assembly. The refrigeration system also includes a heat exchanger configured to selectively receive the refrigerant from at least one of the compressor and the condenser. The heat exchanger is in communication with the desiccant such that the refrigerant in the heat exchanger desorbs moisture from the desiccant.11-12-2009
20090120110Refrigeration System and Method with Controllable Heat Recovery - A method for providing controllable amounts of heat recovery from a refrigerant circuit includes the steps of providing a cooling circuit comprising a compressor, a condenser, an expansion device and an evaporator connected in series by refrigerant flow lines; providing a heat recovery circuit comprising a heat recovery heat exchanger, the heat recovery circuit being connected to the cooling circuit so that the heat recovery heat exchanger is in parallel with the condenser, and the heat recovery heat exchanger being in heat exchange relationship with a fluid to be heated based upon an end-user demand for heat; and selectively flowing refrigerant through the condenser of the cooling circuit and the heat recovery heat exchanger of the heat recovery circuit so as to maintain temperature of the fluid within a temperature hand around a set point provided by the end user.05-14-2009
20090288432TANDEM COMPRESSORS WITH PULSE WIDTH MODULATION SUCTION VALVE - A refrigerant system is provided with tandem compressors. A tandem compressor arrangement includes at least two compressors operating in parallel and having at least one common manifold. A control may operate the compressors either simultaneously, or in some predetermined sequence to provide control over refrigerant system capacity. At least one of the tandem compressors is provided with a pulse width modulation control on a suction line. In this manner, the amount of refrigerant, compressed by the compressor, can be precisely controlled to exactly meet thermal load demands in the conditioned space.11-26-2009
20120291462Ejector Cycle Refrigerant Separator - A system has a compressor. A heat rejection heat exchanger is coupled to the compressor to receive refrigerant compressed by the compressor. An ejector has a primary inlet coupled with heat rejection heat exchanger to receive refrigerant, a secondary inlet, and an outlet. The system has a heat absorption heat exchanger. The system includes means for providing at least of a 1-10% quality refrigerant to the heat absorption heat exchanger and an 85-99% quality refrigerant to at least one of the compressor and, if present, a suction line heat exchanger.11-22-2012
20100275624Air-Conditioning System And Controlling Method For The Same - An air-conditioning system and a controlling method for the same that is capable of improving the operational efficiency of the air-conditioning system are disclosed. The air-conditioning system includes a phase separator (11-04-2010
20120291461Ejector-Type Refrigeration Cycle and Refrigeration Device Using the Same - A system has first and second compressors (11-22-2012
20090266091SYSTEM AND METHOD FOR COMPRESSOR CAPACITY MODULATION IN A HEAT PUMP - A system and method is provided to control and operate a compressor to have two or more discrete output capacities in response to an outdoor temperature measurement. During operation of the compressor in an air conditioning or cooling mode, the compressor has a first output capacity in response to the outdoor temperature being greater than a first temperature setpoint and the compressor has a second output capacity in response to the outdoor temperature being less than a second temperature setpoint. During operation of the compressor in a heating mode, the compressor has different output capacities based on the outdoor ambient temperature.10-29-2009
20100005817Vapor Compression and Expansion Air Conditioner - The present invention is drawn to a method for creating a refrigeration system comprising a piston device for the compressor and expander functions normally provided by a Carnot cycle. Solutions for modifying the overall system to utilize the pulsed nature of the piston action are provided.01-14-2010
20130118194AIRCRAFT MODULAR COOLING SYSTEM - A modular expandable cooling system including a rack sized for receiving multiple modular cooling units having a ram air inlet connected to a ram air source. The system also includes a modular cooling unit having a housing for receipt in the rack, a ram air inlet and outlet, and a refrigerant inlet and outlet. The system includes a condenser mounted in the housing in fluid communication with the ram air inlet, a compressor mounted in the housing downstream from the condenser, an accumulator in fluid communication with the compressor inlet.05-16-2013
20080245083METHOD AND APPARATUS FOR COOLING - A method of calculating net sensible cooling capacity of a cooling unit includes measuring a discharge pressure from of fluid from a compressor and a suction pressure from an evaporator, calculating a condensing temperature of fluid flowing from the compressor and an evaporating temperature of fluid flowing from the evaporator, calculating a mass flow rate of fluid flowing from the compressor, calculating enthalpy of fluid flowing from the compressor, of fluid flowing from the thermal expansion valve, and of fluid flowing from the evaporator, calculating a mass flow rate of fluid flowing through the hot gas bypass valve, and calculating net sensible cooling capacity. Embodiments of cooling units and other methods are further disclosed.10-09-2008
20080264077Method for Controlling High-Pressure in an Intermittently Supercritically Operating Refrigeration Circuit - Method for controlling an intermittently supercritically operating refrigeration circuit (10-30-2008
20090173087Device and Method for Evaporating Water from a Compressor - A system for evaporating excess water from a source includes a housing having: an air inlet, the air inlet directing air in a first direction; an air outlet; a plurality of channels arranged generally perpendicular to the first direction, the channels having undulations; and a water reservoir that feeds water into the channels. In some embodiments, baffles are created with walls that depend from the ceiling of the housing and that are interdigitated with dividers that separate the channels. This configuration can remove water generated by the source (such as an external compressor unit) in a quick and efficient manner.07-09-2009
20090199579PROCESS FOR COOLING A STORAGE CONTAINER - A process for cooling a storage container, in particular a mobile storage container for a cryogenic medium, is described.08-13-2009
20110219793Ejector unit, heat exchange unit and refrigerant short-circuit detecting method - In an ejector unit, an ejector is bonded to a container to define in the container an inlet space in which an inlet of a nozzle portion of the ejector is open, a suction space in which a refrigerant suction port of the ejector is open and an outlet space in which an outlet of a diffuser portion of the ejector is open. The inlet space, the suction space and the outlet space are respectively partitioned from each other by bonding portions between the ejector and the container. The container is provided with a short-circuit detection hole exposed to an exterior of the container at least at one position of a first position between the inlet space and the suction space, and a second position between the suction space and the outlet space. Furthermore, the short-circuit detection hole is enclosed by the bonding portion.09-15-2011
20090314014DEVICE AND METHOD FOR CONTROLLING COOLING SYSTEMS - The present invention concerns a cooling or heating system including at least a compressor (12-24-2009
20110138826DISCRETE FREQUENCY OPERATION FOR UNIT CAPACITY CONTROL - A variable speed electric drive for use in refrigerant systems includes an electric motor for driving an associated component at a variable speed that is a function of an operating frequency of the motor; and a control for supplying alternating discrete drive frequencies to the electric motor to provide a continuously variable speed drive of the associated component. The control cycles the drive frequency to the electric motor among the at least two discrete frequencies so that the variable average resultant speed at which the associated component is driven is a function of a combination of the selected at least two discrete frequencies.06-16-2011
20110138825CARBON DIOXIDE REFRIGERANT VAPOR COMPRESSION SYSTEM - A carbon dioxide refrigerant vapor compression system and method of operating that system are provided. The refrigerant vapor compression system includes a compression device, a flash tank receiver disposed in the refrigerant circuit intermediate a refrigerant heat rejection heat exchanger and a refrigerant heat absorption heat exchanger, and a compressor unload circuit including a refrigerant line establishing refrigerant flow communication between an intermediate pressure stage of the compression device and the refrigerant circuit at a location downstream of the refrigerant heat absorption heat exchanger and upstream of a suction inlet to the compression device, and a unload circuit flow control device disposed in said unload circuit refrigerant line. In response to at least one system operating parameter sensed by at least one sensor, the controller selectively positions the unload flow control device to maintain the refrigerant vapor compression system operating below a preselected high pressure limit.06-16-2011
20120227427PARAMETER CONTROL IN TRANSPORT REFRIGERATION SYSTEM AND METHODS FOR SAME - Embodiments of transport refrigeration systems, apparatus, and/or methods for the same can provide exemplary verification for operating characteristics thereof. In one embodiment, a calculated compressor mid stage pressure can be verified using a prescribed relationship to other transport refrigeration system characteristics. 09-13-2012
20090241566System and method for controlled expansion valve adjustment - A method for controlling temperature pulldown of an enclosure with a refrigeration system having a compressor, a heat rejecting heat exchanger, an expansion valve, and an evaporator comprises circulating a refrigerant through the refrigeration system, sensing a parameter of the enclosure, determining a desired evaporator pressure based upon the parameter sensed, and adjusting the expansion valve as a function of the desired evaporator pressure.10-01-2009
20090255278Refrigerant System With Variable Speed Drive - A refrigerant system (10-15-2009
20090260374Compressor cycle control method for a vehicle air conditioning system - A control methodology for dynamically adjusting the switching limits of a cycled refrigerant compressor in an air conditioning system with the objective of achieving an optimal or specified tradeoff between compressor cycling frequency and discharge air temperature variation under all operating conditions. In a first embodiment, the compressor cycling limits are controlled to maintain a virtually constant discharge air temperature variation for all operating conditions. In a second embodiment, the compressor cycling limits are controlled so that the discharge air temperature variation changes in relation to the discharge air temperature to provide a virtually constant human comfort level for the occupants. And in a third embodiment, the compressor cycling limits are controlled so that the discharge air temperature variation changes in relation to the ambient or outside air temperature to provide a virtually constant human comfort level for the occupants.10-22-2009
20100154445Cooling unit - A cooling unit for cooling an enclosed interior space of a vehicle. Also provided are methods of cooling the interior of the vehicle.06-24-2010
20130213064REFRIGERATOR WITH VARIABLE CAPACITY COMPRESSOR AND CYCLE PRIMING ACTION THROUGH CAPACITY CONTROL AND ASSOCIATED METHODS - A refrigerator appliance (and associated method) that includes a condenser, evaporator and a multi-capacity compressor. The appliance also includes a pressure reducing device arranged within an evaporator-condenser refrigerant circuit, and a valve system for directing or restricting refrigerant flow through the device. The appliance further includes a controller for operating the compressor upon the initiation of a compressor ON-cycle at a priming capacity above a nominal capacity for a predetermined or calculated duration.08-22-2013
20090314015METHOD FOR CIRCULATING SELECTED HEAT TRANSFER FLUIDS THROUGH A CLOSED LOOP CYCLE - The present invention relates to the use of flexible hoses capable of handling high pressure fluids and providing a barrier against permeation loss in air conditioning and refrigeration systems. Such hoses are particularly suitable in air conditioning and refrigeration in which new, low global warming potential refrigerant alternatives are used.12-24-2009
20100186433Scroll Compressors with Different Volume Indexes and Systems and Methods for Same - A plurality of scroll compressors with different fixed volume indexes are connected in fluid parallel circuit and configured to selectively operate to maximize isentropic efficiency at different condensing temperatures. Different quantities of scroll compressors of different volume indexes may be selected based upon typical climate or geographic location environmental conditions to attempt to maximize efficiency. A controller may selectively operate different combinations of the compressors of different volume indexes bases up load demands and condensing temperature conditions, which may be determined in a variety of ways.07-29-2010
20100146995AIR CONDITIONING METHODS AND APPARATUS - Methods and apparatus are provided for enhancing the performance of air conditioning systems (heat pump and traditional) in both cooling and heating modes, in some exemplary embodiments using a controller providing electronic circuitry to enable three stage fan activation at the beginning of a cooling cycle and defeat and avoidance of the now-common forced fan activation after compressor deactivation. In some exemplary embodiments the device enables two stage fan activation at the beginning of a heating cycle (for heat pump systems). In some exemplary embodiments the circuitry is a combination of conventional wiring, relays, and dip switches, and in some exemplary embodiments a microprocessor is provided.06-17-2010
20120060526REFRIGERATOR ENERGY AND TEMPERATURE CONTROL - Apparatus and methodologies are provided to improve the refrigeration system by precisely controlling refrigerator compartment and heat exchanger temperatures through continuous modulation of device speeds or positions to match capacity with instantaneous load. A controller in a refrigerator is configured to provide a plurality of control loops to control various operational aspects of selected components in the refrigerator. A first loop controls the operating speed of a compressor based on temperature of the evaporator or based on the desired speed of an evaporator fan. A second control loop controls speed of an evaporator fan to maintain a prescribed freezer compartment temperature. A third control loop maintains a prescribed temperature in a fresh food compartment. In certain embodiments selected of the control loops may be thermodynamically coupled by way of thermal interaction between the various cooled compartments rather than being electrically coupled. The control loops may be individually configured as one of a proportional, proportional-integral, or proportional-integral-derivative control loop.03-15-2012
20110107778Parallel Condensing Unit Control System And Method - A method comprises monitoring an operating parameter of a refrigeration system that includes a first condensing unit having a first control module and a second condensing unit having a second control module, the first and second condensing units each having at least one compressor. The method also includes controlling, with the first control module, the at least one compressor of the first condensing unit based on the monitoring. The method also includes controlling, with the first control module, the at least one compressor of the second condensing unit based on the monitoring. The first control module controls the at least one compressor of the second condensing unit by communicating with the second control module via a communication link.05-12-2011
20100251737Method of operating a cooling system and cooling system - In a method of operating a cooling system (10-07-2010
20120192579REFRIGERANT VAPOR COMPRESSION SYSTEM OPERATION - A method is provided for protecting a refrigerant vapor compression system during a standstill period following shutdown of the refrigerant vapor compression system. A method is provided for detecting a low refrigerant charge level in a refrigerant vapor compression system operating in a transcritical mode. A refrigerant vapor compression system is provided that includes a controller operative to perform a refrigerant charge detection method.08-02-2012
20120031121AIR CONDITIONER AND METHOD FOR OPERATING AN AIR CONDITIONER - In an air conditioner having a refrigerant conducted in a cooling circuit, the cooling circuit includes, but is not limited to at least one vaporizer situated on a low-pressure side, a condenser situated on a high pressure side, a compressor connected between low-pressure side and high pressure side, and a thermostatic expansion valve connected between high pressure side and low pressure side, furthermore, an inner heat exchanger being provided for transferring heat from the refrigerant on the high-pressure side to refrigerant on the low-pressure side, and the thermostatic expansion valve having a head with a control filling, the characteristic curve of the control filling having a slope s with approximately 0.75 bar/10° C.≦s≦1.05 bar/10° C.02-09-2012
20090107156HEAT PUMP SYSTEM, OPERATION PROCEDURE THEREFOR AND EVAPORATOR SYSTEM - In a heat pump system including a water purifier and an evaporator for evaporating feed-water to produce steam, water used for spray cooling is effectively used and productivity of purified water used for the spray cooling is increased.04-30-2009
20100300127Refrigerated Case - In a self-contained plug-in display cabinet system (12-02-2010
20100300126REFRIGERATING SYSTEM AND METHOD FOR CONTROLLING THE SAME - A refrigerating system according to the invention comprises a refrigerant circuit (12-02-2010
20130145780SYSTEM AND METHOD FOR LIQUID-SUCTION HEAT EXCHANGE THERMAL ENERGY STORAGE - Disclosed is a method and device for a thermal energy storage liquid-suction heat exchanger (TES-LSHX) for air conditioning and refrigeration (AC/R) applications. The disclosed embodiments allow energy to be stored and aggregated over one period of time, and dispatched at a later period of time, to improve AC/R system efficiency during desired conditions. Not only are the benefits of LSHX stored and aggregated for later use, but when dispatched, the discharge rate can exceed the charge rate thereby further enhancing the benefit of demand reduction to utilities. The disclosed embodiments allow great flexibility and can be incorporated into OEM AC/R system designs, and/or bundled with condensing units or evaporator coils. These TES-LSHX systems can be retrofit with existing systems by installing the product at any point along the existing AC/R system's line set.06-13-2013
20110107777AIRCRAFT SYSTEM AND METHOD FOR IMPROVED COOLING EFFICIENCY - An aircraft system for improved cooling efficiency comprises at least one air conditioning pack, coupled to an aircraft, having at least one air compression device powered by at least one power source and having an air compression device inlet. The system further comprises at least one air flow path for redirecting a first portion of a first volume of aircraft interior outflow air from an aircraft interior to the air compression device inlet. The air flow path includes a shutoff valve to enable the air flow path during ground operation of the aircraft and to disable the air flow path for flight operation of the aircraft. The air compression inlet mixes the first volume of aircraft interior outflow air with a second volume of aircraft exterior inflow air to form an air mixture. The air conditioning pack conditions and circulates the air mixture into the aircraft interior.05-12-2011
20110016894Truck Air Conditioner for Keeping Cabin Temperature Comfortable Independently of the Vehicle Engine - This disclosure provides a new high-efficiency air conditioning system for cooling a motor vehicle control cabin. Various components of the system have been optimized (including the motor, the drive train and the condenser) in a way that minimizes battery draw-down, and allows long-term operation on battery power alone. The main engine of the vehicle can be shut down during loading or when the driver is resting overnight, and does not need to be restarted for 8 hours or more. The air conditioning system of this invention enhances the driver's comfort and alertness after resting, decreases vehicle weight, and substantially reduces air pollution and noise. The invention has the added benefits of reducing fuel consumption and wear and tear on the truck's engine, thereby sustaining considerable cost benefit for the fleet operator.01-27-2011
20110016895Methods and Systems for Injecting Liquid Into a Screw Compressor for Noise Suppression - A screw compressor for use in a chiller assembly includes cooperating screw rotors configured to increase the pressure of a vaporized refrigerant flowing through the compressor, a venturi tube arranged in a flow path of the refrigerant in the compressor downstream of the rotors, and an inlet port in fluid communication with a throat of the venturi tube and configured to deliver liquid refrigerant from a condenser of the chiller assembly to the flow path of the refrigerant in the compressor. The venturi tube is configured to cause a pressure drop in the refrigerant in the compressor. The liquid refrigerant delivered from the condenser reduces pulsations in the pressure of the refrigerant discharged from the compressor.01-27-2011
20110030398Inhibiting Compressor Backspin Via a Condenser Motor - Assemblies for HVAC systems and methods of operating HVAC systems are disclosed, including a method of operating an HVAC system having a compressor assembly and a condenser assembly. The compressor assembly includes a compressor having a compressor motor that is susceptible to backspining and capable of generating electric power when backspinning. The condenser assembly includes a condenser motor operatively coupled to a fan. The condenser assembly is electrically coupled to the compressor assembly. The method includes using the condenser motor as an electric load to dissipate electric power generated by the compressor motor when the compressor motor backspins.02-10-2011
20110030399REFRIGERANT SYSTEM WITH FUEL CELL FOR ELECTRICITY GENERATION - A transport refrigeration/air conditioning system includes a fuel cell which is electrically connected to at least one of the compressor drive motor, evaporator fan motor or condenser fan motor to provide electrical power thereto.02-10-2011
20100132385REFRIGERATOR AND OPERATING METHOD THEREOF - A refrigerator and a method of operating the same are disclosed. The refrigerator includes an inrush current preventing unit for preventing an excessive current from being applied when an input power is applied to the refrigerator, a bypass unit connected to the inrush current preventing unit to bypass the input power, a voltage measuring unit for measuring a voltage of the rectified and smoothed input power, and a controller for controlling the input power input through the inrush current preventing unit in response to the voltage measured by the voltage measuring unit, for recovering a function of the inrush current preventing unit, and for driving a compressor. An excessive voltage or an inrush current is prevented from being applied when the refrigerator is operated, and the input power is bypassed when the compressor is driven. Therefore, standby time for the re-driving is decreased and convenience is enhanced.06-03-2010
20100236264COMPRESSOR MOTOR CONTROL - A compressor, which is susceptible to protective shutdowns when certain operating conditions are sensed, includes a control feature wherein, when the compressor is restarted after a period of time, it may be caused to operate in an unloaded mode such that a reoccurrence of the shutdowns is less likely.09-23-2010
20110083455AIR CONDITIONING SYSTEM AND METHOD FOR CONTROLLING OPERATION THEREOF - Disclosed are an air conditioning system and a method for controlling an operation thereof, whereby a charging device for charging power to be supplied into the indoor unit is employed, a chargeable control unit is separately employed, or a separate control unit connectable between the indoor unit and an electronic expansion valve is employed, thereby closing the electronic expansion valve even if power supplied into the indoor unit is blocked while controlling opening and closing of the electronic expansion valve, and additionally preventing the electronic expansion valve from being left open, resulting in prevention of an overload of a compressor within an indoor unit.04-14-2011
20110083456REFRIGERATION CYCLE DEVICE AND METHOD OF CONTROLLING THE SAME - A refrigeration cycle device 04-14-2011
20110083454CONTROL SYSTEM FOR OPERATING CONDENSER FANS - Methods and systems for controlling the operation of condenser fans are provided. At most discharge pressures, the operation of the condenser fans may be controlled based on a capacity of the compressor system. To adjust operation of the condenser fans, the speed of the fans and/or the number or operational fans may be adjusted. The control of the condenser fans based on compressor system capacity may be overridden at compressor discharge pressures that rise above a high pressure level and fall below a low pressure level. At the high and low discharge pressures, the fan speed and/or number of operating fans may be adjusted based solely on the discharge pressure rather than on the compressor system capacity.04-14-2011
20100212337ENGINE DRIVEN REFRIGERANT COMPRESSOR WITH PULSE WIDTH MODULATION CONTROL - A fuel-powered engine is provided to drive a mobile air conditioning or refrigeration unit such as a portable chiller, a container refrigeration unit, a portable packaged system, a transport tractor-trailer or truck refrigeration unit, etc. A control rapidly changes the engine speed between the predefined set of discreet engine speeds to precisely adjust the capacity of the refrigerant system. If the engine operates only at a single speed, then the control cycles the engine between this operating speed and a zero speed (the engine is shut off). If the engine can operate at multiple discreet speeds, then the control can cycle the engine between any of these speeds (including a zero speed). When a lower capacity is desirable, the engine operates for a longer time interval at a lower speed, and when a higher capacity is desirable, the engine operates for a longer period of time at a higher speed. The cycle rate is selected to control the comfort (e.g. temperature and/or humidity) of the conditioned environment within the specified tolerance band, while conforming to the reliability requirements.08-26-2010
20110239668HIGH-SIDE PRESSURE CONTROL FOR TRANSCRITICAL REFRIGERATION SYSTEM - To accommodate a transcritical vapor compression system with an operating envelope which covers a large range of heat source temperatures, a high side pressure is maintained at a level determined not only by operating conditions at the condenser but also at the evaporator. A control is provided to vary the expansion device in response to various combinations of refrigerant conditions sensed at both the condenser and the evaporator in order to maintain a desired high side pressure.10-06-2011
20110209486System and Method for Controlling Operations of Vapor Compression System - A system and a method for controlling an operation of a vapor compression system are disclosed, such that a performance of the system measured in accordance with a metric of the performance is optimized. A control signal is modified with a modification signal including a perturbation signal having a first frequency, wherein the control signal controls at least one component of the vapor compression system. A metric signal representing a perturbation in the performance of the system caused by the modification signal is determined, wherein the metric signal has a second frequency substantially equal to the first frequency. The control signal is adjusted based on a function of a phase between the perturbation signal and the metric signal, such that the performance is optimized.09-01-2011
20100064702COMBINED OPERATION AND CONTROL OF SUCTION MODULATION AND PULSE WIDTH MODULATION VALVES - A refrigerant system is provided with a pulse width modulation suction valve and a second valve on a line that bypasses the pulse width modulation suction valve. This second valve has a variable opening. In this manner, the pressure within the compressor shell is maintained at the lowest possible level regardless of the system operating conditions, when the pulse width modulation suction valve is cycled to a closed position. Further, the second valve can continue providing capacity control, should the pulse width modulation suction valve fail.03-18-2010
20100058783INJECTION OF REFRIGERANT IN SYSTEM WITH EXPANDER - A refrigerant system incorporates an expander. At least a portion of refrigerant bypasses an evaporator and is injected into the compression process to cool main refrigerant vapor flow and compressor elements. In disclosed embodiments, the injected refrigerant may be partially expanded in the expander and routed either into the compressor suction or to an intermediate point in the compression process. A valve may control the amount of the injected refrigerant to achieve desired operational characteristics for the refrigerant system.03-11-2010
20100064703STANDBY VARIABLE FREQUENCY COMPRESSOR DRIVE - A transport refrigeration system is provided with a variable speed compressor which is operated only in the low capacity perishable range of operation. In this way, the line voltage and frequency power can be used during high capacity operation and a relatively small inverter can be used to provide variable voltage and frequency for the variable speed operation. The variable voltage and frequency can also be provided to a variable speed condenser motor to provide additional condensing capacity during economized operation. It can also be used to provide DC voltage to the compressor for heating purposes.03-18-2010
20100071391CO2 REFRIGERANT SYSTEM WITH TANDEM COMPRESSORS, EXPANDER AND ECONOMIZER - A refrigerant system utilizes an expander that provides a more efficient expansion process and recovers at least a portion of energy from this expansion process. At least a portion of refrigerant that has been at least partially expanded in the expander is tapped and passed through an economizer heat exchanger. In the economizer heat exchanger, the tapped refrigerant cools a main circuit refrigerant increasing its thermodynamic potential. Further, a compression section is provided with at least two compressors operating in tandem and allowing for multiple stages of unloading. By selectively utilizing one or more of the tandem compressors, the economizer cycle, and the expander, the refrigerant system can achieve very efficient operation and provide enhanced control flexibility, in particular, for the CO03-25-2010
20110174002REFRIGERANT SYSTEM AND METHOD FOR CONTROLLING THE SAME - A refrigerant system includes an outdoor unit and a plurality of indoor units. The outdoor unit has a compressor and a plurality of heat exchangers and each indoor unit has a heat exchanger. A detector detects pressures at an inflow side and a discharge side of the compressor, and a controller controls a direction of refrigerant flow for the heat exchangers of the outdoor unit. This may involve changing the refrigerant flow direction for at least one of the heat exchanger of the outdoor unit based on the detected pressures.07-21-2011
20100126192Spot cooling system for open boats - A spot cooling air conditioner system is for open boats having an open cockpit with seats. A refrigerant compressor is driven by the engine. A condenser includes a cooling water passage and a refrigerant passage in thermal communication. The condenser cooling water is supplied by the engine water pump.05-27-2010
20110100038Refrigerant Circuit And Method For Operating A Refrigerant Circuit - There is provided a refrigerant circuit comprising a compressor (05-05-2011
20110100037Refrigerant recovery method and apparatus - A method and apparatus for recovering fluids in various states from a system includes a motor that is configured to engage a compressor in a first direction and engage a compressor in a second direction depending on the fluids contained therein.05-05-2011
20110072837REFRIGERATION SYSTEM MOUNTED WITHIN A DECK - A refrigeration system is provided for use with an ultra-low temperature freezer having a deck and a refrigerated cabinet supported above the deck. The system has a first refrigeration stage and a second refrigeration stage. The first stage defines a first fluid circuit for circulating a first refrigerant. The first stage has a first compressor, a condenser and a first expansion device that is in fluid communication with the first fluid circuit. The second stage defines a second fluid circuit for circulating a second refrigerant. The second stage has a second compressor, a second expansion device and an evaporator that is in fluid communication with the second fluid circuit. The system includes an insulated enclosure supported within the deck and a split-flow heat exchanger that is in fluid communication with the first and second fluid circuits and which is located within the insulated enclosure.03-31-2011
20110067418Heat pump water heater - The present invention relates to a fluid heater comprising a vapour compression cycle system. The vapour compression cycle system includes an evaporator, at least one condenser and a working fluid. The fluid heater also includes a fluid conduit through which a fluid can pass in thermal contact with the condenser to allow, via heat exchange between the fluid and the working fluid, the heating of the fluid. A sensor providing an output from which the temperature of the working fluid at the condensing phase of the vapour compression cycle system can be determined is also included in the fluid heater. The fluid heater system has a flow rate controller to control the flow rate of fluid through the conduit. The fluid heater is controlled using a controller operatively connected with the flow rate controller to vary the flow rate of fluid through the conduit reliant on the output from the sensor to achieve a desired target temperature of the fluid leaving the conduit.03-24-2011
20110048043HEAT PUMP - A heat pump includes an evaporator 03-03-2011
20110048041PRESSURE RELIEF IN HIGH PRESSURE REFRIGERATION SYSTEM03-03-2011
20110048042TRANSPORT REFRIGERATION SYSTEM AND METHOD OF OPERATION - A refrigerant vapor compression system using CO03-03-2011
20130186119Adaptive Control of Vapor Compression System - A control system controls adaptively an operation of a vapor compression system. The control system includes a memory for storing a mapping relationship between control inputs of the vapor compression system, and a processor for executing a supervisory controller and an optimization controller. The supervisory controller controls the operation of the vapor compression system using a set of control inputs selected according to the mapping relationship. The optimization controller modifies the mapping relationship in response to the operation of the vapor compression system.07-25-2013
20100263393TRANSPORT REFRIGERATION SYSTEM AND METHOD OF OPERATION - A refrigeration system for a transport refrigeration unit and a method of operating the refrigeration system for cooling a temperature controlled cargo space are disclosed. The refrigeration system includes a primary refrigerant circuit including a refrigerant compression device, a motor for driving the compression device; a variable speed drive for varying the speed of operation of the compression device; and a controller operatively associated with the variable speed drive and the compression device. The controller controls the cooling capacity of the refrigeration system by selectively controlling the speed of said compression device in a first continuous run mode of operation and by selectively powering on and powering off said compression device in a first cycling mode of operation.10-21-2010
20100263392REFRIGERATOR - A refrigerator is disclosed that consists in contrast to conventional refrigerators of a number of heat exchangers that are separated into halves, in which the same refrigeration cycle process takes place simultaneously but chronologically displaced, and wherein all heat exchangers are driven the same compressor. A cold medium flows about one half of the heat exchanger (evaporator) at certain time periods, a hot medium flows about the other half of the heat exchanger (condenser).10-21-2010
20100257881COMPOSITIONS COMPRISING IODOTRIFLUOROMETHANE AND USES THEREOF - Disclosed are compositions comprising iodotrifluoromethane and other compounds that are useful as heat transfer fluids, including refrigerants, in a stationary air conditioning or refrigeration system, a flooded evaporator chiller or a direct expansion chiller. Also disclosed are methods for producing cooling and methods for replacing R22, R407C, R410A, R404A or R507A in such equipment.10-14-2010
20100242508USE OF AN ADJUSTABLE EXPANSION VAVLE TO CONTROL DEHUMIDIFICATION - A refrigerant system is provided with a control for its expansion device. The control operates the expansion device to adjust the superheat of the refrigerant leaving an evaporator to have desired dehumidification for air being delivered into an environment to be conditioned.09-30-2010
20100242509AIR ROUTING FOR SIMULTANEOUS HEATING AND COOLING - In an enclosed space which requires refrigeration or cooling at the same time when the heating of air is required, provision is made to divert at least a portion of the flow of heated air from the air conditioning/refrigeration heat rejection heat exchanger to the climate-controlled zone which requires heating. An airflow control device, such as one or more dampers, is provided for controlling the amount of heated air delivered to the climate-controlled-zone.09-30-2010
20090126378CHILLER OF ETCH EQUIPMENT FOR SEMICONDUCTOR PROCESSING - A chiller for etching equipment for processing a semiconductor includes: a chuck for controlling a temperature of a semiconductor wafer, a coolant pipeline connected to the chuck, a coolant tank connected to the coolant pipeline, an evaporator in the coolant tank, a refrigerant in the evaporator, a compressor for compressing refrigerant flowing from the evaporator, a condenser for condensing the compressed refrigerant from the compressor, and an electronically controlled expansion valve connected to the condenser to receive compressed refrigerant, and connected to the evaporator for feeding the expanded refrigerant into evaporator.05-21-2009
20080314053Capacity Variable Type Rotary Compressor and Driving Method Thereof and Driving Method for Air Conditioner Having the Same - In a capacity variable type rotary compressor, its operation method and an operation method of an air conditioner having the same, a plurality of discharge holes are formed, and one of the discharge holes is connected to a bypass hole, which is opened and closed by a sliding valve according to a pressure difference, so as to be selectively connected to an intake hole. Accordingly, a cooling capability lowering rate is increased during capacity varying operation of the compressor, such that the air conditioner can be variously controlled, and unnecessary power consumption of the compressor and the air conditioner having the same can be reduced.12-25-2008
20110041529COMPOSITIONS OF HYDROCHLOROFLUOROOLEFINS - The present invention relates to solvent/cleaner and heat transfer fluid compositions comprising at least one hydrochlorofluoroolefin (HCFO), 1-chloro-3,3,3-trifluoropropene (HCFO-1233zd), particularly the trans-isomer. The HCFO of the present invention can be used in combination with co-agents including, hydrofluorocarbons (HFCs), hydrofluoroolefins (HFOs), hydrocarbons, ethers including hydrofluoroethers (HFEs), esters, ketones, alcohols, 1,2-transdichloroethylene and mixtures thereof.02-24-2011
20110041528COOLER DISTRIBUTOR FOR A HEAT EXCHANGER - A distributor (02-24-2011
20110041527Closed Circuit Vapour Compression Refrigeration System and a Method for Operating The System - A method for operating a closed circuit vapour compression refrigeration system is disclosed. The system may operate with supercritical pressure on a high pressure side, and includes at least one compressor, at least one heat rejector, at least two in parallel connected heat absorbers, at least one variable expansion means up flow of each heat absorber and at least one control unit for controlling the variable expansion means, connected to a set of sensors. The flow rate of the refrigerant through each of the variable expansion means, is controlled by the control unit, coordinating the flow of refrigerant through each of the variable expansion means to maintain a control parameter within a set range. Any surplus charge resulting from the control is buffered on a low pressure side of the system. Furthermore a refrigeration system based on a closed vapour compression circuit is described.02-24-2011
20100132387COMPOSITIONS COMPRISING FLUOROOLEFINS AND USES THEREOF - The present invention relates to fluoroolefin compositions. The fluoroolefin compositions of the present invention are useful as refrigerants or heat transfer fluids and in processes for producing cooling or heat. Additionally, the fluoroolefin compositions of the present invention may be used to replace currently used refrigerant or heat transfer fluid compositions that have higher global warming potential.06-03-2010
20120198868LOW SUCTION PRESSURE PROTECTION FOR REFRIGERANT VAPOR COMPRESSION SYSTEM - The present disclosure provides a refrigerant vapor compression system includes a compressor (08-09-2012
20110162396CAPACITY BOOSTING DURING PULLDOWN - The transcritical refrigeration system is provided with a main compressor and booster compressor that is made to operate in parallel with the main compressor only during pulldown conditions. A single, two stage compressor is provided with valving which is controlled so as to provide for the two stages operating in series in normal operation and for operating in parallel during pulldown conditions.07-07-2011
20110162397FLASH TANK ECONOMIZER CYCLE CONTROL - A flash tank economizer includes a sensor for sensing a condition indicative of pressure in the flash tank, and when that pressure is found to equal or exceed the critical pressure of the particular refrigerant being used, a controller responsively closes a valve in the economizer vapor line to shut off the economizer. A sensor is also provided to sense the pressure at the compressor mid-stage, and if that pressure is found to exceed the pressure in the flash tank, the controller causes the flow control device to function so as to prevent the flow of refrigerant from the compressor mid-stage to the flash tank. Provision is also made for selectively draining refrigerant from the flash tank to reduce the pressure therein from a supercritical to a subcritical condition.07-07-2011
20110162398REFRIGERANT POWERED VALVE FOR A GEOTHERMAL POWER PLANT - A vapor expansion system includes a normally closed pneumatic valve between the evaporator and the turbine inlet, with the valve being selectively actuated by the flow of refrigerant vapor from the evaporator so as to enable opening the valve only during periods in which sufficient pressure has built up in the evaporator to properly operate the turbine. A bypass line has a normally open pneumatic valve with an actuator that is similarly caused to operate by pressurized refrigerant vapor from the evaporator. Both actuators are vented to the condenser such that the refrigerant vapor vented from the actuator does not escape to ambient.07-07-2011
20110162395ELECTRICALLY POWERED TRANSPORT REFRIGERATION UNITS - A refrigerated vehicle (07-07-2011
20100319372PULSE WIDTH MODULATION WITH REDUCED SUCTION PRESSURE TO IMPROVE EFFICIENCY - The present invention relates to a way of reducing the amount of energy required to partially compress a refrigerant in a compressor operating in a rapidly cycled unloaded mode. A valve on a suction line is closed when the compressor moves to the unloaded condition. In this manner, the amount of energy required to partially compress the refrigerant in the compressor, at the unloaded condition, is dramatically reduced.12-23-2010
20110252818AIR CONDITIONING APPARATUS AND METHOD OF CONTROLLING THE AIR CONDITIONING APPARATUS - An air conditioning apparatus includes a refrigerant circuit, a refrigerant heating unit and a stop signal controller. The refrigerant circuit includes a compressor, an indoor heat exchanger, a pressure reducing mechanism, and an outdoor heat exchanger. The refrigerant heating unit heats refrigerant flowing through the refrigerant circuit. The stop signal controller, in a case of causing the compressor to stop at a time when the compressor and the refrigerant heating unit are both operating, executes first stop control in which a stop signal is issued in order to stop the refrigerant heating unit, and then a stop signal is issued in order to stop the compressor after elapse of a first amount of time. A method of controlling an air conditioning apparatus having the refrigerant circuit and the refrigerant heating unit includes executing the first stop control.10-20-2011
20110113797METHODS AND SYSTEMS FOR COMPRESSOR OPERATION - There is provided a refrigeration system (05-19-2011
20110132007COMPRESSOR DISCHARGE CONTROL ON A TRANSPORT REFRIGERATION SYSTEM - In a refrigeration system having a compressor, a condenser, an evaporator, and a controller for controlling an expansion valve, a process for controlling compressor discharge during a cooling cycle comprising the steps of monitoring a compressor discharge parameter, comparing the compressor discharge parameter to a set point stored in a controller memory, and selectively operating the expansion valve upstream of the evaporator in response to a difference between the compressor discharge parameter and the set point.06-09-2011
20110132006METHOD OF CONTROLLING INLET PRESSURE OF A REFRIGERANT COMPRESSOR - A refrigeration unit includes an engine, a motor capable of producing a similar power output as the engine, and a compressor driven by one of the engine and the motor. The compressor includes a suction inlet and a discharge outlet. The refrigeration unit also includes a condenser in fluid communication with the discharge outlet through which pressurized, gaseous refrigerant is condensed, an evaporator in fluid communication with the condenser to receive liquid refrigerant and return gaseous refrigerant to the suction inlet, a passageway having a first end in fluid communication with an outlet of the condenser, and a second end in fluid communication with the suction inlet, and a purge valve defining at least a portion of the passageway between the first and second ends. The purge valve is operable to selectively divert liquid refrigerant from the condenser to the suction inlet to increase the pressure in the suction inlet.06-09-2011
20100071389METHOD AND APPARATUS FOR HIGHLY EFFICIENT COMPACT VAPOR COMPRESSION COOLING - The subject invention pertains to a method and apparatus for cooling. In a specific embodiment, the subject invention relates to a lightweight, compact, reliable, and efficient cooling system. The subject system can provide heat stress relief to individuals operating under, for example, hazardous conditions, or in elevated temperatures, while wearing protective clothing. The subject invention also relates to a condenser for transferring heat from a refrigerant to an external fluid in thermal contact with the condenser. The subject condenser can have a heat transfer surface and can be designed for an external fluid, such as air, to flow across the heat transfer surface and allow the transfer of heat from heat transfer surface to the external fluid. In a specific embodiment, the flow of the external fluid is parallel to the heat transfer surface. In another specific embodiment, the heat transfer surface can incorporate surface enhancements which enhance the transfer of heat from the heat transfer surface to the external fluid. In another specific embodiment, an outer layer can be positioned above the heat transfer surface to create a volume between the heat transfer surface and the outer layer through which the external fluid can flow.03-25-2010
20100071390METHOD AND APPARATUS FOR HIGHLY EFFICIENT COMPACT VAPOR COMPRESSION COOLING - The subject invention pertains to a method and apparatus for cooling. In a specific embodiment, the subject invention relates to a lightweight, compact, reliable, and efficient cooling system. The subject system can provide heat stress relief to individuals operating under, for example, hazardous conditions, or in elevated temperatures, while wearing protective clothing. The subject invention also relates to a condenser for transferring heat from a refrigerant to an external fluid in thermal contact with the condenser. The subject condenser can have a heat transfer surface and can be designed for an external fluid, such as air, to flow across the heat transfer surface and allow the transfer of heat from heat transfer surface to the external fluid. In a specific embodiment, the flow of the external fluid is parallel to the heat transfer surface. In another specific embodiment, the heat transfer surface can incorporate surface enhancements which enhance the transfer of heat from the heat transfer surface to the external fluid. In another specific embodiment, an outer layer can be positioned above the heat transfer surface to create a volume between the heat transfer surface and the outer layer through which the external fluid can flow.03-25-2010
20090301113Heat Source Apparatus , Heat Source System, And Method Of Controlling Heat Source Apparatus - A turbo chiller that can run continuously even with a low load, for example, less than 10% load, is provided. In a turbo chiller having a low-load mode for repeatedly controlling stopping and starting of the turbo chiller when a coolant inlet temperature measured by a coolant inlet temperature sensor is equal to or lower than a first temperature forming a temperature difference with respect to the coolant outlet temperature, a stop limit mode for stopping the turbo chiller when the coolant inlet temperature or the coolant outlet temperature is equal to or lower than a second temperature below the first temperature is provided.12-10-2009
20090293514COOLING SYSTEM FOR REFRIGERATOR - A cooling system for a refrigerator having a fresh food compartment and a freezer compartment separated by a partition, includes a compressor for compressing a refrigerant; a condenser for condensing the compressed refrigerant; an evaporator having a freezer compartment portion and a fresh food compartment portion; wherein the freezer compartment portion of the evaporator cools a freezer compartment, and the fresh food compartment portion of the evaporator cools a fresh food compartment. The fresh food compartment portion of the evaporator projects into a passage formed in the partition which passage extends between the fresh food compartment portion of the evaporator and the fresh food compartment.12-03-2009
20110185753SUPERHEAT CONTROL FOR HVAC&R SYSTEMS - A superheat control utilizes a sensor at a location downstream of an evaporator after some heat is delivered to the refrigerant. In one embodiment, the compressor is a sealed compressor with at least a portion of the refrigerant being heated by an electric motor. The temperature is sensed after the refrigerant temperature has increased after passing over the electric motor. In another embodiment, the refrigerant temperature is measured after some minimal compression and minimal temperature rise has occurred within the compressor pumping elements. In either case, by measuring the temperature of the refrigerant after some additional heat has been added to the refrigerant, the refrigerant super-heat leaving the evaporator can be controlled to a lower value. The improved superheat control enhances the system performance by increasing system efficiency, system capacity and improving oil return to the compressor.08-04-2011
20100024450MULTI TEMPERATURE CONTROL SYSTEM - An environmentally controlled shipping container including a storage space, a first environmentally controlled space within the storage space, a second environmentally controlled space within the storage space, and a transport refrigeration unit. The transport refrigeration unit including a compressor that provides a flow of refrigerant, a condenser that receives the flow of refrigerant from the compressor, a first evaporator positioned within the first environmentally controlled space and in fluid communication with the condenser, a second evaporator positioned within the second environmentally controlled space and in fluid communication with the condenser, and a pressure regulator associated with the first evaporator. The pressure regulator selectively restricts the flow of refrigerant from the first evaporator to the compressor such that the flow of refrigerant from the first evaporator to the compressor is substantially equal to the flow of refrigerant from the second evaporator to the compressor.02-04-2010
20100018228BIO-RENEWABLE THERMAL ENERGY HEATING AND COOLING SYSTEM AND METHOD - The present invention is directed towards a bio-renewable thermal energy heating and cooling system which is capable of rejection, reclamation and cogeneration. The refrigeration system of the present invention utilizes one or more evaporators and one or more condensers to transform thermal energy in the form of waste heat in one environment for use in another environment. The hot and cold sides of the refrigeration process may be split for multiple applications for increased utilization of the system energy. The environmental variables are balanced so as to optimize the properties of the refrigerant and the capabilities of the system compressor.01-28-2010
20080256961Economized Refrigerant System with Vapor Injection at Low Pressure - A refrigerant system with an economizer cycle incorporates a time dependant vapor injection scheme to reduce losses and enhance performance. The benefits of such an approach are particularly pronounced at low pressure ratios typical of air conditioning applications. The injection of refrigerant occurs during a limited time interval and at a particular point of time into a compression cycle. The vapor injection preferably occurs when the compression chamber are sealed (or about to be sealed off) from a suction port and continues until refrigerant pressure in the compression chambers is equal (or about to be equal) to the pressure at the injection line. This communication time constitutes about 35% of time of one revolution. In one embodiment, such time dependence of refrigerant vapor injection is provided by a specific compressor design. In another embodiment, a fast-acting solenoid valve is placed at the vicinity of the injection port to control the initiation and duration of the injection process. The benefits for an unloading scheme are disclosed as well.10-23-2008
20110314845TADEM COMPRESSOR OPERATION - A refrigerant system operates with tandem compressors. As is known, one or more of the tandem compressors can be shut down at part-load operating conditions when lower refrigerant system capacity is required. A control periodically engages at least one shut down tandem compressor for a short period of time. This increases the refrigerant mass flow of refrigerant throughout the refrigerant system to ensure that oil travels through the system and is not retained in the system.12-29-2011
20110314847DUAL DUTY COMPRESSION MACHINE - A compression machine includes a refrigerant condenser, an expansion device, a refrigerant evaporator, a first compressor and a second compressor. Each compressor is arranged to receive lower pressure refrigerant vapor from the evaporator and to deliver higher pressure vapor to the condenser independently of the other compressor. The first compressor operates when the compression machine is operating in a first duty mode, for example a water-cooling mode. The second compressor operates when the compression machine is operating in a second duty mode, for example one of a water-heating mode or a brine cooling. The first compressor is selected for optimal performance in the first duty only and the second compressor is selected for optimal performance in the second duty mode only.12-29-2011
20110314846Refrigeration Circuit and Method for Operating a Refrigeration Circuit - The invention relates to a refrigeration circuit having a mono- or multi-component refrigerant circulating therein, said refrigeration circuit comprising, in the direction of flow, a condenser, a collecting container, a relief device connected upstream of an evaporator, an evaporator and a compressor unit with single-stage compression.12-29-2011
20100186432COMPOSITIONS COMPRISING FLUOROOLEFINS - Disclosed are compositions comprising HFC-1225ye and other compounds that are useful as heat transfer fluids, including refrigerants, in a flooded evaporator chiller, a direct expansion chiller or a closed loop heat transfer system, such as a mobile air conditioning system. The compositions are also useful as cleaning solvents, aerosol propellants, foam blowing agents, fire extinguishing or suppression agents and sterilants. Also disclosed are methods for producing cooling and methods for replacing HFC-134a in a flooded evaporator chiller, a direct expansion chiller or a closed loop heat transfer system using such compositions.07-29-2010
20120042668COMPOSITIONS COMPRISING FLUOROOLEFINS AND USES THEREOF - The present invention relates to fluoroolefin compositions. The fluoroolefin compositions of the present invention are useful as refrigerants or heat transfer fluids and in processes for producing cooling or heat. Additionally, the fluoroolefin compositions of the present invention may be used to replace currently used refrigerant or heat transfer fluid compositions that have higher global warming potential.02-23-2012
20120000222ZONE PRIORITY TEMPERATURE CONTROL IN A MULTIPLE ZONE TRANSPORT REFRIGERATION SYSTEM - A multi-zone transport refrigeration system. The system includes a compressor, a condenser, a refrigerant circuit, a first temperature control zone and a second temperature control zone. A controller is configured to identify a priority zone and a non-priority zone based upon a first magnitude of a difference between a first temperature set point and a first zone temperature derived from the first air temperature sensor, and a second magnitude of a difference between the second temperature set point and a second zone temperature derived from the second air temperature sensor. A non-priority zone is isolated from the refrigerant circuit for a pre-defined period in order to maximize a refrigerant flow to the priority zone.01-05-2012
20120011867MULTI-CIRCUIT HEAT EXCHANGER - A baffle assembly is disposed within a manifold of a multi-circuit heat exchanger for dividing the interior volume of that manifold into a first chamber associated with one circuit and a second chamber associated with another circuit. The baffle assembly includes a pair of baffle members that extend generally transversely across the interior volume of the manifold are disposed in spaced apart relationship thereby forming a void space therebetween. The void space is in fluid communication with a region exterior of that manifold whereby any fluid leaking from either of the first or second chamber into the void space will be vented therefrom.01-19-2012
20120055184CENTRIFUGAL-CHILLER AND METHOD FOR CONTROLLING THE SAME - Provided is a centrifugal-chiller including one variable-speed centrifugal-compressor and one constant-speed centrifugal-compressor and capable of high-efficiency operation. A centrifugal-chiller comprising a variable-speed centrifugal-compressor whose rotational frequency can be varied by an inverter and which compresses a refrigerant; a constant-speed centrifugal-compressor connected in parallel with the variable-speed centrifugal-compressor and operated at a constant rotational speed to compress the refrigerant; and a control unit that controls the operations of the variable-speed centrifugal-compressor and the constant-speed centrifugal-compressor, wherein in the case where a required load factor of the centrifugal-chiller is less than a predetermined value, the control unit selects a variable-speed-compressor priority operating mode in which only the variable-speed centrifugal-compressor is activated, and in the case where the required load factor of the centrifugal-chiller is the predetermined value or greater, the control unit selects a combined-use operating mode in which the variable-speed centrifugal-compressor and the constant-speed centrifugal-compressor are activated.03-08-2012
20100139298MOTOR-COMPRESSOR DRIVE APPARATUS - Multiple compressors are connected to a common shaft of a drive motor. Provision may be made for selectively disengaging one or more of the compressors from its drive connection. The multiple compressors an preferably attached to opposite ends of a common motor shaft extending from both ends of the motor. Multiple compressors may be arranged to operate in parallel flow relationship or in series flow relationship in a single refrigerant circuit. The compressors may also be installed on separate refrigerant circuits. In a series flow relationship, a vapor or liquid injection function may be provided. Both compressors may be of an open-drive design, or one of the compressors nay share a common housing with the motor.06-10-2010
20120060525APPARATUS AND METHOD FOR MONITORING SUPER-HEATING OF REFRIGERANT TO IMPROVE COMPRESSOR EFFICIENCY AND LOWER ENERGY USAGE - Apparatus and methodologies are provided to monitor temperature from at least two locations on an evaporator in a refrigeration system. Operational characteristics of one or more of the compressor, condenser and evaporator cooling fans are adjusted based on the difference in temperature between the two locations on the evaporator. In some systems a second evaporator may be provided along with a refrigerant control valve. Cooling air flow across the second evaporator and refrigerant distribution between the plural evaporators may also be control.03-15-2012
20120312038Refrigeration System And Methods For Refrigeration - A refrigeration system includes: a compressor arrangement for compressing gaseous refrigerant from a first pressure to a second pressure, wherein the second pressure comprises a condensing pressure; a plurality of condenser evaporator systems, wherein each condenser evaporator system comprises: (1) a condenser for receiving gaseous refrigerant at a condensing pressure and condensing the refrigerant to a liquid refrigerant; (2) a controlled pressure receiver for holding the liquid refrigerant from the condenser; and (3) an evaporator for evaporating liquid refrigerant from the controlled pressure receiver to form gaseous refrigerant; a first gaseous refrigerant feed line for feeding the gaseous refrigerant at the second pressure from the compressor arrangement to the plurality of condenser evaporator systems; and a second gaseous refrigerant feed line for feeding gaseous refrigerant from the plurality of condenser evaporator systems to the compressor arrangement.12-13-2012
20110094247A/C Maintenance System Using Heat Transfer from the Condenser to the Oil Separator for Improved Efficiency - An apparatus and methodology are provided for advantageously increasing heat transfer between the evaporator/oil separator (“accumulator”) and condenser of a refrigerant recovery/recycling system, to increase the efficiency of the system and to simplify the system. Embodiments include a refrigerant recovery/recycling device comprising a compressor having a suction inlet and a discharge outlet; an accumulator fluidly connected to a refrigerant source and to the compressor suction inlet; a recovery tank fluidly connected to the compressor discharge outlet; and a heat exchanger for transferring heat from the recovery tank to the accumulator, for raising the temperature of the accumulator and lowering the temperature of the recovery tank.04-28-2011
20110094246METHODS AND SYSTEMS FOR CONTROLLING INTEGRATED AIR CONDITIONING SYSTEMS - An integrated air conditioning system having a first air conditioning unit having a first evaporator with a first input and a first output; a second air conditioning unit having a second evaporator with a second input and a second output; a first conduit fluidly connecting the first input with the second output; a second conduit fluidly connecting the second input with the first output. The first and second conduits and the first and second evaporators form a working fluid circuit.04-28-2011
20110094248Refrigerant System and Method of Operating the Same - The present disclosure provides a refrigerant system that comprises a compressor, a main refrigerant circuit, an economizer refrigerant circuit, and a bypass refrigerant circuit. The refrigerant system further comprises a single refrigerant flow control device switching between different operational modes to provide various degree of system unloading in operation. The present disclosure also provides a method of operating the refrigerant system.04-28-2011
20120131935AIR CONDITIONER AND METHOD FOR OPERATING SAME - An air conditioner according to the present comprises a plurality of chillers which include a compressor, a condenser, a expansion device and an evaporator and supply cold water through water pipes connected to the evaporator in parallel. An operating chiller of the plurality of chillers sets a cold water set temperature of the operating chiller according to pressure difference between high pressure part and low pressure part and controls the compressor capacity according to the cold water set temperature and transmits an operation order to a chiller not operating until the present if the pressure difference is more than the set pressure for the set time and at least one of the chillers is not operating. Thus, it is possible to perform an efficient operation according to load and to minimized power consumption.05-31-2012
20090133415HVAC Thermal Storage for Hybrid Vehicle - A system and method for providing cool air to a passenger compartment of a hybrid vehicle in an engine off mode is disclosed. This may include operating a HVAC system to provide cold refrigerant flowing through an evaporator while an engine is operating, and forcing air through the evaporator to cool the air. A first portion of the cooled air from the evaporator is directed through a heater core and a second portion around the heater core, and an electric water pump is activated to pump coolant from a thermal storage tank, through the heater core and back to the thermal storage tank to cool the coolant. When the engine operation is ceased, the air flow is directed through the heater core, and the coolant is pumped from the thermal storage tank, through the heater core and back to the thermal storage tank to cool the air.05-28-2009
20120117990HEAT TRANSFER PROCESS - The present invention relates to a heat transfer process using a composition containing hydro(chloro)fluoroolefins. It more particularly relates to a heat transfer process that successively comprises a step of evaporation of a refrigerant; a step of compression, a step of condensation of said refrigerant at a temperature greater than or equal to 70° C. and a step of expansion of said refrigerant characterized in that the refrigerant comprises at least one hydrofluoroolefin having at least four carbon atoms represented by the formula (I) R05-17-2012
20120117988REFRIGERATING SYSTEM WITH PARALLEL STAGED ECONOMIZER CIRCUITS AND A SINGLE OR TWO STAGE MAIN COMPRESSOR - A refrigeration system (05-17-2012
20120159976CHILLER APPARATUS CONTAINING TRANS-1,1,1,4,4,4-HEXAFLUORO-2-BUTENE AND METHODS OF PRODUCING COOLING THEREIN - Disclosed herein is a chiller apparatus containing refrigerant characterized by said refrigerant being HFO-133606-28-2012
20120227426Extended Range Heat Pump - A two-stage air source heat pump having an extended operational temperature range combines intercooling, regeneration, and inter-stage vapor recirculation. Cooling a working gas in between the lower and higher-pressure stages decreases the work required to compress the working gas. The entire system may be computer controlled using sensors to monitor flows, temperatures, and pressures in and around the system.09-13-2012
20120312037VAPOR CYCLE SYSTEM WITH DE-SUPERHEATER - A vapor cycle system comprises a compressor for compressing a coolant to form a superheated vapor, a de-superheater for cooling the superheated vapor to form a reduced temperature vapor by exchanging heat with a cooling fluid flow, a condenser for condensing the reduced temperature vapor to form a condensed liquid by exchanging heat with the cooling fluid flow, and an evaporator for evaporating the condensed liquid. The de-superheater is located downstream of the condenser in the cooling fluid flow, and a temperature of the cooling fluid flow is higher at the de-superheater than at the condenser.12-13-2012
20120125024HEAT PUMP AND METHOD OF CONTROLLING THE SAME - A heat pump and a method of controlling a heat pump are provided. The heat pump may perform gas injection through a plurality of coolant injection circuits formed in a compressor, such as a scroll compressor, to increase a corresponding flow rate. The heat pump may control the plurality of coolant injection circuits based on one or more operation conditions by selecting an appropriate optimal middle pressure from a high-and-low pressure difference, a pressure ratio, and a compression ratio of the compressor to enhance cooling/heating performance.05-24-2012
20120159975METHOD FOR OPERATING A COOLING DEVICE FOR COOLING A SUPERCONDUCTOR AND COOLING DEVICE SUITABLE THEREFOR - A cooling device is disclosed for cooling a superconductor, wherein the cooling device includes a linear compressor for compressing a working medium and a cooling unit for providing a cooling power to a cryogenic coolant of the superconductor by expanding the working medium. The linear compressor includes two pistons of which at least one, preferably both synchronously relative to each other, are displaceable at a frequency and a stroke linear to the other piston, wherein a defined cooling power can be generated at a good efficiency so that the cooling device is suitable for use particularly in mobile installations, such as ships. To this end, according to at least one embodiment of the invention, the stroke of the at least one displaceable piston is controlled at a preferably prescribed target value.06-28-2012
20100175396OIL RETURN IN REFRIGERANT SYSTEM - To address the problem of lubricant entrainment within the refrigerant system components such as an evaporator and suction line, a control is provided to periodically, substantially and intermittently increase the refrigerant flow through these components to thereby carry the trapped lubricant back to the compressor. The increased flow of refrigerant can be accomplished by periodically throttling and then unthrottling either an expansion device or a suction modulation valve to cause instantaneous pressure buildup within a respective section of the vapor compression system and subsequent increase of the refrigerant flow through the above-referenced components such as an evaporator and suction line. Suggested time intervals of both the throttling and unthrottling states are provided, as well as the frequency of occurrence for subsequent oil return cycles.07-15-2010
20120210738Method For Controlling The Operation Of An Air-Conditioning Loop In A Vehicle - The present invention relates to a method for controlling the outlet temperature (TRCPO) of a compressor (CP) built into the air-conditioning loop of a vehicle in which a subcritical refrigerant fluid flows and including a condenser (CD), an expansion valve (EXV), and an evaporator (EV). The monitoring method comprises the steps of calculating a limit temperature at the compressor inlet (TRCPI_L), estimating a temperature at the compressor inlet (TRCPI_E), and modifying a control signal of the compressor (PWM08-23-2012
20120210737Variable Differential and Offset Control for Refrigeration Systems - A beverage dispensing apparatus is characterized by a beverage dispenser and a refrigeration system for chilling beverage to be dispensed by the beverage dispenser. The refrigeration system has a compressor coupled to an evaporator for chilling the beverage, and a controller determines the amount of chilling that must be provided by the refrigeration system to chill the beverage and adjusts cut-in and cut-out beverage temperature set-points for the compressor accordingly. Advantageously, the cut-in and cut-out set-points are adjusted to beverage temperature values such that the chilling capacity of the refrigeration system is made to closely match to the amount of chilling required by the beverage, and also such that on/off cycles of the refrigeration system are decreased.08-23-2012
20120210736CASCADE FLOATING INTERMEDIATE TEMPERATURE HEAT PUMP SYSTEM - A cascade heat pump system is configured with variable-speed compressors which allow operation at a high system coefficient of performance for a given thermal load. An electronic control module may be utilized to dynamically vary the speed of the compressors to achieve maximum energy efficiency. Variable-speed fans or blowers may also be used.08-23-2012
20120167603DYNAMIC SUPERHEAT CONTROL FOR HIGH EFFICIENCY REFRIGERATION SYSTEM - A vapor compression refrigeration system including components capable of determining the superheat at a compressor inlet is provided. The vapor compression refrigeration system may include sensors capable of making measurements from which the superheat at the compressor inlet may be determined. The vapor compression refrigeration system may be operable to compare the determined superheat level at the inlet to the compressor to a desired superheat level and generate a new evaporator discharge superheat level target for one or more evaporators operatively interconnected to the compressor to affect the superheat at the compressor inlet. The vapor compression refrigeration system may be operable to broadcast the new evaporator discharge superheat level target to the one or more evaporators over a communications bus. The vapor compression refrigeration system may update and broadcast the evaporator discharge superheat level target at programmed intervals.07-05-2012
20120167602PRESSURE SPIKE REDUCTION FOR REFRIGERANT SYSTEMS INCORPORATING A MICROCHANNEL HEAT EXCHANGER - A refrigerant system includes at least one compressor (07-05-2012
20120167601Ejector Cycle - A system (200; 300; 400; 500; 600) has a compressor (22; 200, 221). A heat rejection heat exchanger (30) is coupled to the compressor to receive refrigerant compressed by the compressor. An ejector (38) has a primary inlet (40) coupled to the heat rejection heat exchanger to receive refrigerant, a secondary inlet (42), and an outlet (44). A separator (48) has an inlet (50) coupled to the outlet of the ejector to receive refrigerant from the ejector, a gas outlet (54), and a liquid outlet (52). One or more valves (244, 246, 248, 250) are positioned to allow switching of the system between first and second modes. In the first mode: refrigerant passes from the heat rejection heat exchanger, through the ejector primary inlet, out the ejector outlet, to the separator; a first flow from the separator gas outlet passes through the compressor to the heat rejection heat exchanger; and a second flow from the separator liquid outlet passes through a heat absorption heat exchanger (64) and through the ejector secondary port. In the second mode: refrigerant passes from the heat rejection heat exchanger to the separator; a first flow from the separator gas outlet passes to the compressor; and a second flow from the separator liquid outlet passes through the heat absorption heat exchanger to the compressor.07-05-2012
20100011788OFF-SEASON START-UPS TO IMPROVE RELIABILITY OF REFRIGERANT SYSTEM - A vapor compression system includes a timer and a controller for periodically starting up the system during the off-season periods (primarily non-cooling months) in which the system would normally be shut down. This provides periodic lubrication to the compressor components and prevents severe flooded starts due to excessive accumulation of refrigerant in the compressor (compressor oil sump in particular) and other system components. Provision is also made to sequentially turn on and off system components such as the compressor, the evaporator fan and the condenser fan to enhance the system operation. The timing sequences are provided for the time intervals between the startups, as well as the off-season operation cycle times.01-21-2010
20120073318Refrigerant System With Multiple Load Modes - A refrigerant system capable of operating at multiple capacity modes includes an evaporator, a multi-stage compressor assembly, a first fluid flow path, a second fluid flow path, a first valve, and a second valve. The multi-stage compressor assembly has a first stage and a second stage. The first fluid flow path extends from the evaporator to the first stage of the multi-stage compressor assembly. The second fluid flow path connects to the first fluid flow path and to the multi-stage compressor assembly between the first stage and the second stage.03-29-2012
20120073317REFRIGERATOR - A refrigerator includes a compressor to compress refrigerant, a condenser to liquefy the refrigerant supplied from the compressor, a capillary tube to decompress and expand the refrigerant supplied from the condenser, an evaporator to vaporize the refrigerant supplied from the capillary tube, a shutoff valve installed at an inlet of the capillary tube so as to prevent the refrigerant in the condenser during stoppage of the compressor from being moved to the evaporator, and a control unit to enable the shutoff valve to be blocked together so as to prevent movement of the refrigerant from the condenser to the evaporator during stoppage of the compressor, and to enable the shutoff valve to be opened together so as to move the refrigerant from the condenser to the evaporator during starting of the compressor.03-29-2012
20120073316CONTROL OF A TRANSCRITICAL VAPOR COMPRESSION SYSTEM - A transcritical vapor compression system includes a compressor for compressing a refrigerant, a first heat exchanger for cooling the refrigerant, an expansion device for decreasing the pressure of the refrigerant, a second heat exchanger for absorbing heat into the refrigerant, and a controller programmed to calculate a first energy difference across the second heat exchanger and a second energy difference across the compressor, to calculate an energy ratio by dividing the first energy difference by the second energy difference, to compare the energy ratio to a previously calculated energy ratio, and to adjust operating parameters of the system based on the comparison of the energy ratio with respect to the previously calculated energy ratio.03-29-2012
20120117989METHOD AND APPARATUS FOR VARIABLE REFRIGERANT CHILLER OPERATION - A refrigeration system includes a compressor, a condenser, an expansion device, an evaporator, and an additional refrigerant vessel connected in a closed refrigerant loop. The additional refrigerant vessel is connected to the condenser at the high pressure side by a first valve and to the evaporator at a low pressure side by a second valve. A controller controls operation of the first valve and the second valve. Only one of the first valve and the second valve may be open at the same time. Refrigerant from the additional refrigerant vessel may be added to the closed refrigerant loop when the controller receives a low refrigerant level indication of in the evaporator. Refrigerant may also be removed from the closed refrigerant loop when the controller receives a high refrigerant level indication in the evaporator.05-17-2012
20100095688REFRIGERANT DISTRIBUTION IMPROVEMENT IN PARALLELL FLOW HEAT EXCHANGER MANIFOLDS - A method and apparatus are presented to ensure adequate distribution of a two-phase refrigerant flowing through a plurality of heat transfer tubes of a parallel flow heat exchanger in a generally parallel manner. In several embodiments of this invention, predominantly single-phase refrigerant (liquid for condensers and vapor for evaporators) is tapped and delivered downstream to a location where a predominantly single-phase refrigerant phase is already present, bypassing at least some of the heat transfer tubes. In this manner, the remaining single-phase refrigerant (vapor for condensers and liquid for evaporators) flowing through the heat exchanger core is uniformly distributed amongst a plurality of heat transfer tubes in the next downstream pass.04-22-2010
20120186283COMPRESSOR MOTOR PREHEAT CONTROL - A method of controlling a vapor cycle system having first and second compressors includes operating the first compressor to compress refrigerant while the second compressor is idle, sensing a motor temperature of the second compressor, activating a preheating mode in which the motor of the second compressor is powered to generate heat when the motor temperature of the second compressor is below a lower temperature threshold, turning off the preheating mode when the sensed motor temperature of the second compressor is above an upper temperature threshold, and limiting the maximum duration of the preheating mode to a preheating time period, such that the preheating mode is turned off after being activated for the preheating time period.07-26-2012
20120186284REFRIGERANT SYSTEM AND METHOD FOR CONTROLLING THE SAME - A refrigerant system, includes: an air conditioner configured to condition air in a building by using a first refrigerant cycle; a cooler configured to cool air in a storage compartment of the building by using a second refrigerant cycle; and a refrigerant heat exchanger configured to exchange heat between a refrigerant of the air conditioner and a refrigerant of the cooler, wherein the cooler includes a main compressor and an auxiliary compressor configured to backup the main compressor.07-26-2012
20120318008REFRIGERANT DISTRIBUTION APPARATUS AND METHODS FOR TRANSPORT REFRIGERATION SYSTEM - Embodiments of apparatus, transport refrigeration units, and methods for operating the same can control refrigerant compression device restart for a refrigerant vapor compression system. Embodiments can provide control for transitioning a refrigerant vapor compression system to an economized mode.12-20-2012
20080302113REFRIGERATION SYSTEM HAVING HEAT PUMP AND MULTIPLE MODES OF OPERATION - The present invention provides a refrigeration system including a first refrigerant circuit including a first heat exchanger for transferring heat from refrigerant, a second refrigerant circuit including a second heat exchanger for transferring heat to refrigerant, and a third refrigerant circuit. The third refrigerant circuit includes a compressor, a condenser connected to the first refrigerant circuit such that heat exchange can occur between the refrigerants of the first and refrigerant circuits, an expansion device, and an evaporator connected to the second refrigerant circuit such that heat exchange can occur between the refrigerant of the second and third refrigerant circuits. The refrigerant can travel along the third refrigerant circuit in a common direction during operation in both heating and cooling modes. Refrigerant can be prevented from moving between first, second, and third refrigerant circuits during operation in heating and cooling modes.12-11-2008
20100326099HIGH-EFFICIENCY HEAT PUMPS - As discussed herein, a first aspect of the present invention provides a high-efficiency heat pump that includes a frame, as well as a first circuit, a first compressor, a condenser heat exchanger, a first electronic expansion valve, an evaporator heat exchanger, and a controller. The first circuit, the first compressor, the condenser heat exchanger, the first electronic expansion valve, and the evaporator heat exchanger can be supported by the frame. The first compressor, the condenser heat exchanger, the first electronic expansion valve, and the evaporator heat exchanger can be connected to the first circuit. The controller can be in electronic communication with the first electronic expansion valve, and the controller can be configured to control operation of the first electronic expansion valve and/or the second electronic expansion valve.12-30-2010
20120297800Supersonic Cooling Nozzle Inlet - A supersonic cooling system operates by pumping fluid. A geometric element may be situated in a fluid flow path to modify the fluid flow. Because the supersonic cooling system pumps fluid, the cooling system does not require the use of a condenser. The cooling system utilizes a compression wave to facilitate a phase change utilized in a cooling effect. An evaporator operates in the critical flow regime in which the pressure in one or more evaporator nozzles will remain almost constant and then ‘shock up’ to the ambient pressure.11-29-2012
20100115973COOLING STORAGE AND METHOD OF OPERATING THE SAME - The liquid refrigerant from the compressor 05-13-2010
20120079841Refrigeration Process and System for Recovering Cold from Methane by Refrigerants - A refrigeration system includes a plurality of heat exchangers (E04-05-2012
20120079840METHOD AND SYSTEM FOR TEMPERATURE CONTROL IN REFRIGERATED STORAGE SPACES - The present invention relates to a method of controlling air temperature within a refrigerated storage space based on a temperature-error integral of supply air discharged into the storage space. Another aspect of the invention relates to a refrigerated storage space comprising a corresponding temperature control system.04-05-2012
20120279239Method and Device for Low-Temperature Cooling/Liquefaction - The invention relates to a method for low-temperature cooling/liquefaction of a working fluid, in particular a working fluid including helium or consisting of pure helium by means of a refrigerator/liquefier that includes a working circuit provided with a compressor station and a cold box. The refrigerator/liquefier subjects the working gas within the working circuit to a cycle that includes, in series: compressing the working fluid within the compressor station, cooling and decompressing the working fluid in the cold box, and heating the working fluid with a view to the return thereof to the compressor station. The compressor station includes one or more compression levels, each one using one or more compressors mounted on landings. The method is characterized in that the refrigerator includes a device for injecting a seal gas that is separate from the working fluid on at least one landing of the compressor(s) so as to form a gas seal that guides the working fluid leaks, coming from the working circuit, to an area for recirculating and returning the fluid into the working circuit.11-08-2012
20120285185REFRIGERATION STORAGE IN A REFRIGERANT VAPOR COMPRESSION SYSTEM - A refrigerant vapor compression system (11-15-2012
20120137712Method for operating an aircraft cooling system and aircraft cooling system - The invention relates to a method for operating an aircraft cooling system (06-07-2012
20100132386Electrochemical Compressor and Refrigeration System - A refrigeration system defines a closed loop that contains a working fluid, at least part of the working fluid being circulated through the closed loop. The refrigeration system includes a first heat transfer device that transfers heat from the first heat reservoir to the working fluid, a second heat transfer device that transfers heat from the working fluid to the second heat reservoir, and an electrochemical compressor between the first and second heat transfer devices. The electrochemical compressor includes one or more electrochemical cells electrically connected to each other through a power supply, each electrochemical cell including a gas pervious anode, a gas pervious cathode, and an electrolytic membrane disposed between and in intimate electrical contact with the cathode and the anode. The working fluid includes a condensable refrigerant that bypasses the electrochemical process; and an electrochemically active fluid that participates in the electrochemical process within the electrochemical compressor.06-03-2010
20110146311APPARATUS FOR CONTROLLING RELATIVE HUMIDITY IN A CONTAINER - In one embodiment, the invention provides a refrigeration system having a compressor configured to compress a refrigerant gas and a condenser fluidly coupled to the compressor to receive compressed refrigerant gas from the compressor, the condenser configured to condense the refrigerant gas. In addition the refrigeration system includes a heat exchanger having a first section fluidly coupled to the compressor, and a second section fluidly coupled between the condenser and the compressor, wherein the first section receives compressed refrigerant gas from the compressor, and wherein the second section receives condensed refrigerant from the condenser, evaporates the refrigerant, and delivers the evaporated refrigerant to the compressor.06-23-2011
20110146310REFRIGERATOR AND OPERATION CONTROL METHOD THEREOF - Disclosed herein is a refrigerator. In a refrigeration cycle including a channel switching valve to selectively supply a refrigerant to a first evaporator side and/or a second evaporator side and hot pipes, a hot pipe on a freezing chamber side and a hot pipe on a refrigerating chamber are disposed upstream and downstream of the channel switching valve, respectively to reduce unbalance in amounts of the refrigerant and in the amounts of generated heat.06-23-2011
20110146309CHLORINE GAS PRODUCTION - Embodiments of the present disclosure include a process for the production of chlorine gas. For the various embodiments, the process includes compressing a gas mixture of vaporized liquid chlorine and a feed gas containing chlorine to form a compressed gas. Chlorine in the compressed gas is condensed into liquid chlorine. A first portion of the liquid chlorine is vaporized to provide a heat of condensation to condense chlorine from the compressed gas into liquid chlorine. A second portion of the liquid chlorine is vaporized to provide both the vaporized liquid chlorine for the gas mixture and a heat of condensation to cool a tail gas from the process. A chlorine gas product from the vaporized first portion of the liquid chlorine is also produced.06-23-2011
20130019620Helium Management Control System - A helium management control system for controlling the helium refrigerant supply from a common manifold supplies cryogenic refrigerators with an appropriate helium supply. The system employs sensors to monitor and regulate the overall refrigerant supply to deliver an appropriate refrigerant supply to each of the cryogenic refrigerators depending on the computed aggregate cooling demand of all of the cryogenic refrigerators. An appropriate supply of helium is distributed to each cryopump by sensing excess and sparse helium and redistributing refrigerant accordingly. If the total refrigeration supply exceeds the demand, or consumption, excess refrigerant is directed to cryogenic refrigerators which can utilize the excess helium to complete a current cooling function more quickly. If the total refrigeration demand exceeds the total refrigeration supply, the refrigerant supply to some or all of the cryogenic refrigerators will be reduced accordingly so that detrimental or slowing effects are minimized based upon the current cooling function.01-24-2013
20130167566Ejectors and Methods of Manufacture - An ejector (07-04-2013
20130167567REFRIGERATION CYCLE APPARATUS - A refrigeration cycle apparatus includes low-pressure side pressure detecting means for detecting the pressure of a refrigerant being sucked by a compressor, suction refrigerant temperature detecting means for detecting the temperature of the refrigerant being sucked by the compressor, frequency detecting means for detecting the operation frequency of the compressor, cooling target fluid inflow temperature detecting means for detecting the temperature of a cooling target fluid flowing in an evaporator, cooling target fluid outflow temperature detecting means for detecting the temperature of the cooling target fluid flowing out of the evaporator, and flow rate calculating means (measuring unit, computing unit, and storage unit) for calculating the absolute quantity of the flow rate of the cooling target fluid flowing in the evaporator using a value detected by each detecting means.07-04-2013
20080216493MICROCHANNEL COOLING CONDENSER FOR PRECISION COOLING APPLICATIONS - The present disclosure provides a method, apparatus, and system for a centralized microchannel cooling system in precision cooling applications, such as mission-critical systems with data centers or cabinets or rooms with medical equipment. The microchannel condenser is designed to provide sufficient cooling for such applications by configuring multiple microchannel slabs together in a fashion that advantageously can increase the overall cooling abilities of multiple slabs not heretofore known. The system can provide a retrofit condenser for some existing precision cooling systems that have limitations on size, while satisfying cooling capacity requirements. The multiple slabs can be cooled by flowing a fluid such as air or a liquid across them. One or more microchannel slabs can be mounted horizontally, vertically, or in an inclined position. Further, the system can allow for multiple passes of refrigerants through the microchannel slabs.09-11-2008
20130174590ECONOMIZER COMBINED WITH A HEAT OF COMPRESSION SYSTEM - A refrigeration system having a cooling circuit, a heating circuit, a pressurizing receiver tank circuit, a pilot circuit and a liquid injection circuit wherein the hot gas line includes a solenoid valve that connects an outlet of a compressor to an outlet of a receiver tank, and wherein the liquid injection circuit includes a liquid injection solenoid that connects the outlet of the receiver tank to an outlet of an economizer.07-11-2013
20130111934Ejector Cycle Refrigerant Separator - A system has a compressor (05-09-2013
20130125570HIGH CAPACITY CHILLER COMPRESSOR - A high efficiency, low maintenance single stage or multi-stage centrifugal compressor assembly for large cooling installations. A cooling system provides direct, two-phase cooling of the rotor by combining gas refrigerant from the evaporator section with liquid refrigerant from the condenser section to affect a liquid/vapor refrigerant mixture. Cooling of the stator with liquid refrigerant may be provided by a similar technique. A noise suppression system is provided by injecting liquid refrigerant spray at points between the impeller and the condenser section. The liquid refrigerant may be sourced from high pressure liquid refrigerant from the condenser section.05-23-2013
20130125569Ejector Cycle05-23-2013
20130125568Compressor Assemblies and Methods to Minimize Venting of a Process Gas During Startup Operations - Systems and methods are provided for compressing a cryogenic fluid using a multi-stage compressor. Coolant in a first coolant loop cools cooling jackets of the compression stages and/or inter-stage heat exchangers and warms a pre-compression heat exchanger. The temperature of the coolant in the first heat exchanger is moderated by ambient-air heat exchange. The process fluid is electively cooled by one of the inter-stage heat exchangers after each of the compression stage if the temperature of the process fluid is above a temperature criterion. This enables the system to operate through a transient period (cool down period) without venting process fluid. The inter-stage heat exchangers are preferably bypassed when the system reaches steady-state operating temperature.05-23-2013
20130139531REFRIGERATION SYSTEM HAVING A CONTINUOUSLY VARIABLE TRANSMISSION - Inventive embodiments are directed to components, subassemblies, systems, and/or methods for a refrigeration system having a compressor operably coupled to continuously variable accessory drive (CVAD). In one embodiment, the refrigerant is adapted to cool the CVAD. In another embodiment, the refrigerant is configured to actuate a change in operating condition of the CVAD. A change in operating condition of the CVAD can be based at least in part on the thermodynamic state, such as pressure or temperature, of the refrigerant. In one embodiment, a skew-based control system is adapted to facilitate a change in the ratio of a CVAD. In another embodiment, a skew-based control system includes a skew actuator coupled to a carrier member. In some embodiments, the skew actuator is configured to rotate a carrier member of a CVT. Among other things, shift control interfaces for a CVT are disclosed.06-06-2013
20110209485SUCTION SUPERHEAT CONROL BASED ON REFRIGERANT CONDITION AT DISCHARGE - A relationship is developed between a discharge condition of a refrigerant leaving a compressor, and the suction superheat or refrigerant quality. By relying upon measurement and control of the discharge condition, the present invention is able to achieve very low suction superheat values. Controlling the operation to very low suction superheat values results in augmented refrigerant system performance.09-01-2011
20110247350TRUCK TRAILER REFRIGERATION SYSTEM - The refrigeration unit of an electrically powered trailer refrigeration system includes an economized scroll compressor and an economizer circuit selectively operable to inject refrigeration vapor into an intermediate stage of the scroll compressor. An engine driven generator produces AC current to power the scroll compressor and other electric components of the system. During operation of the refrigeration system at high capacity demand, a controller will operate the refrigeration system in an economized mode if sufficient electric power is available from the generator and in the non-economized mode if insufficient power is available to sustain operation of the refrigeration system in the economized mode.10-13-2011
20130174591SUPERHEAT CONTROL FOR A REFRIGERANT VAPOR COMPRESSION SYSTEM - A refrigerant vapor compression system includes a compressor, an expansion valve, a compressor speed sensor operatively connected to the compressor, an ambient temperature sensor, and a controller operatively coupled to the expansion valve, compressor speed sensor and ambient temperature sensor. The controller including a superheat control that is configured and disposed to selectively activate the expansion valve to establish a desired superheat value based on a speed of the compressor as sensed by the compressor speed sensor and ambient temperature as sensed by the ambient temperature sensor.07-11-2013
20130145781Multi-Compressor Refrigeration System and Method for Operating It - A refrigeration system (06-13-2013
20100300125AUTOMOTIVE CLIMATE SYSTEM AND METHOD OF CONTROLLING SAME - An automotive climate control system includes an evaporator, a variable speed compressor and a controller. The controller is configured to periodically alter a previous target evaporator temperature at a selected rate to generate a current target evaporator temperature, select a target compressor speed based on a difference between an actual evaporator temperature and the current target evaporator temperature, and command the compressor to operate at the target compressor speed.12-02-2010
20100307177RAPID COMPRESSOR CYCLING - A single speed compressor is provided with a switching device and control for turning the compressor drive motor ON and OFF in repeated succession at a selected ON time/OFF time ratio within a selected cycle time interval. The ON/OFF ratio and cycle time interval are selected to maintain desired temperature and/or humidity control within a conditioned space.12-09-2010
20100307176Water Cooled Condenser in a Vehicle HVAC System - An HVAC system for use in a vehicle. The HVAC system comprises an evaporator, a refrigerant compressor that receives a refrigerant from the evaporator and compresses the refrigerant, a condenser that receives the refrigerant from the compressor and has fins with air flowing through the fins to remove heat from a refrigerant flowing through the condenser, and an expansion device that receives the refrigerant from the condenser and directs the refrigerant to the evaporator. The HVAC system also comprises a water tank that receives and stores water, a water spray pump that receives water from the water tank, and a nozzle that receives water from the water spray pump and is located adjacent to the condenser, with the nozzle selectively spraying water on the fins of the condenser.12-09-2010
20130180272EXPANSION-VALVE CONTROL DEVICE, HEAT-SOURCE UNIT, AND EXPANSION-VALVE CONTROL METHOD - The degree-of-opening of an expansion valve is set to an appropriate degree-of-opening regardless of the load and external conditions for a heat-source unit. In a turbo refrigerator including a compressor that compresses a refrigerant; a condenser that condenses a compressed refrigerant by means of cooling water; an evaporator that evaporates a condensed refrigerant and also performs heat exchange between this refrigerant and cold water; and an expansion valve that causes a liquid-phase refrigerant retained in the condenser to expand, a expansion-valve control device (07-18-2013
20130180273HEAT PUMP DEVICE, HEAT PUMP SYSTEM, AND METHOD FOR CONTROLLING THREE-PHASE INVERTER - A selection unit switches between a phase θp and a phase θn different from the phase θp substantially by 180 degrees, and outputs one of them in synchronization with a carrier signal. A voltage-command generation unit generates and outputs three-phase voltage command values Vu*, Vv* and Vw* based on the phase outputted by the selection unit. A PWM-signal generation unit generates three-phase voltage command values Vu*′, Vv*′ and Vw*′ by correcting the three-phase voltage command values Vu*, Vv* and Vw* outputted by the voltage-command generation unit according to a predetermined method, and generates six drive signals corresponding to switching elements of the inverter based on the three-phase voltage command values Vu*′, Vv*′ and Vw*′ and the carrier signal. The PWM-signal generation unit outputs the generated drive signals to the corresponding switching elements of the three-phase inverter, to cause the inverter to generate a high-frequency AC voltage.07-18-2013
20130180274REFRIGERATION CYCLE APPARATUS AND REFRIGERATION CYCLE CONTROL METHOD - An integrated air-conditioning and hot-water-supply system includes a compressor, a plate-type water heat exchanger, a hot-water-supply pressure-reducing mechanism, and an outdoor heat exchanger. Moreover, the integrated air-conditioning and hot-water-supply system includes a high-pressure sensor that detects a high pressure in the compressor, and a controller that calculates a condensing temperature of the plate-type water heat exchanger based on the high pressure detected by the high-pressure sensor. When the calculated condensing temperature is higher than or equal to a preset target condensing-temperature value, the controller performs condensing-temperature control for controlling the operating frequency of the compressor based on a difference between the calculated condensing temperature and the target condensing-temperature value, and performs opening-degree control for controlling the opening degree of the hot-water-supply pressure-reducing mechanism concurrently with the condensing-temperature control based on a difference between a current opening degree of the hot-water-supply pressure-reducing mechanism and a preset target opening-degree value.07-18-2013
20120017616Heat Transfer Method - The invention relates to a heat transfer method that uses a composition containing from 60 to 95 wt % of 1,1,1,3,3-pentafluoropropane and from 5 to 40 wt % of at least one hydrocarbon selected from n-pentane, isopentane and cyclopentane. The invention more particularly relates to a heat transfer method that successively includes the step of evaporating a refrigerant fluid, a compression step, the step of condensing said fluid at a temperature higher than or equal to 35° C., and preferably between 70° C. and 140° C., and the step of expanding said fluid, characterised in that the refrigerant fluid includes from 60 to 95 wt % of 1,1,1,3,3-pentafluoropropane and from 5 to 40 wt % of at least one hydrocarbon selected from n-pentane, isopentane and cyclopentane.01-26-2012
20120017615APPARATUS AND METHOD FOR DRY CYCLE COMPLETION CONTROL IN HEAT PUMP DRYER BY DECLINING CAPACITY INDICATION BY ROLLING AVERAGE COMPRESSOR WATTS OR HEAT EXCHANGER PRESSURE OR TEMPERATURE - An apparatus includes a mechanical refrigeration cycle arrangement having a working fluid and an evaporator, a condenser, a compressor, and an expansion device, cooperatively interconnected and containing the working fluid. The apparatus also includes a drum to receive clothes to be dried, a duct and fan arrangement configured to pass air over the condenser and through the drum, a sensor located to sense at least one parameter, and a controller coupled to the sensor and/or the compressor. The parameter(s) includes at least one of temperature of the working fluid, pressure of the working fluid, and power consumption of the compressor. The controller is operative to monitor, as a function of time, the parameter(s), determine whether the parameter(s) reaches a predetermined decision condition; and, if the parameter(s) reaches the predetermined decision condition, power down the mechanical refrigeration cycle at least by causing the compressor to shut off.01-26-2012
20130192282VEHICLE AIR CONDITIONING SYSTEM - A vehicle air conditioning system includes a compressor, a condenser, an evaporator and a controller. The controller is operatively coupled to the compressor to manage operation of the compressor during a cooling operation that provides temperature reduction of air flowing across heat transferring portions the evaporator. The controller further manages operation of the compressor in a moisture releasing operation in response to termination of the cooling operation. The moisture releasing operation includes, for example, finite operation of the compressor that retards release of moisture from the heat transferring portions of the evaporator.08-01-2013
20130199222High Efficiency Cooling System - An efficient indirect building cooling system that bypasses a conventional chiller mechanism by connecting the indoor and outdoor intermediate fluid systems when conditions permit. This system includes indoor and outdoor fluid cooling circuits, each of which interfaces with the conventional chiller mechanism. The two fluid cooling circuits are connected together when weather conditions make doing so more efficient.08-08-2013
20130205815METHOD FOR CONTROLLING A SUPPLY OF REFRIGERANT TO AN EVAPORATOR - A method for controlling a supply of refrigerant to an evaporator (08-15-2013
20130205814HEAT PUMP OPERATION METHOD AND HEAT PUMP SYSTEM - A heat pump operation method includes: obtaining, on a per time unit basis, generated power, load power, surplus power, and an impact magnitude; and controlling operation of the heat pump to cause the heat pump to consume an amount of power for generating heat adjusted to follow the surplus power obtained on a per unit time basis. In the controlling, when the impact magnitude is greater than a predetermined first threshold value, the operation of the heat pump is controlled to permit consumption of the power supplied from an energy supplier and approximate a reverse flow of the surplus power to zero, and when the impact magnitude is less than or equal to a predetermined second threshold value, the operation of the heat pump is controlled to permit the reverse flow of the surplus power and approximate the consumption of power supplied from the energy supplier to zero.08-15-2013

Patent applications in class Compressing, condensing and evaporating

Patent applications in all subclasses Compressing, condensing and evaporating