Patent application number | Description | Published |
20090025406 | Refrigerant Quantity Determining System of Air Conditioner - In a multi-type air conditioner, the adequacy of the refrigerant quantity charged in the air conditioner can be accurately determined, even when the refrigerant quantity charged on site is inconsistent, or even when a reference value of the operation state quantity, which is used for determining the adequacy of the refrigerant quantity, fluctuates depending on the pipe length of the refrigerant communication pipe, combination of utilization units, and the difference in the installation height among each unit. In an air conditioner ( | 01-29-2009 |
20090031739 | AIR CONDITIONER - An air conditioner performs a refrigerant quantity judging operation to judge the refrigerant quantity in a refrigerant circuit, and includes a heat source unit, utilization units, expansion mechanisms, a first refrigerant gas pipe, a second refrigerant gas pipe, a refrigerant liquid pipe, switching mechanisms, bypass circuits, bypass circuit opening/closing element, and a controller. The switching mechanism can switch between a first state and a second state. The bypass circuit opening/closing element are provided in the bypass circuits that bypass the first refrigerant gas pipe to the second refrigerant gas pipe, and open and close the bypass circuits. The controller opens the bypass circuit opening/closing element before performing the refrigerant quantity judging operation. | 02-05-2009 |
20090044550 | AIR CONDITIONER - An error in judgment due to the difference in the temperature of the refrigerant at an outlet of a condenser is reduced when judging the adequacy of the refrigerant quantity. An air conditioner ( | 02-19-2009 |
20090100849 | AIR CONDITIONER - An air conditioner includes a pipe volume calculating section and a refrigerant circuit configured by the interconnection of a heat source unit and a utilization unit via a refrigerant communication pipe. The pipe volume calculating section calculates the volume of the refrigerant communication pipe based on an additional charging quantity which is a refrigerant quantity to be additionally charged after the refrigerant circuit is configured by interconnecting the heat source unit and the utilization unit via the refrigerant communication pipe. | 04-23-2009 |
20090126379 | AIR CONDITIONER - An air conditioner includes a refrigerant circuit, a refrigerant quantity calculating section, and a refrigerant quantity judging section. The refrigerant circuit is configured by the interconnection of a compressor, an outdoor heat exchanger, and an indoor heat exchanger. The refrigerant quantity calculating section uses a relational expression between the refrigerant quantity in each portion of the refrigerant circuit when the refrigerant circuit is divided into a plurality of portions and an operation state quantity of constituent equipment or refrigerant flowing in the refrigerant circuit in order to calculate the refrigerant quantity in each portion from the operation state quantity of constituent equipment or refrigerant flowing in the refrigerant circuit. The refrigerant quantity judging section uses the refrigerant quantity in each portion calculated by the refrigerant quantity calculating section in order to judge the adequacy of the refrigerant quantity in the refrigerant circuit. | 05-21-2009 |
20090126380 | AIR CONDITIONER - An air conditioner includes a refrigerant circuit, an operation controlling section, a stability judging section, a refrigerant quantity judging section, and a condition changing section. The operation controlling section is capable of performing a refrigerant quantity judging operation to control constituent equipment to reach a predetermined target control value. The stability judging section judges whether or not the refrigerant quantity judging operation has stabilized. The refrigerant quantity judging section judges the adequacy of the refrigerant quantity in the refrigerant circuit by using an operation state quantity of constituent equipment or refrigerant flowing in the refrigerant circuit when it is judged that the refrigerant quantity judging operation has stabilized. The condition changing section changes the target control value in the refrigerant quantity judging operation when it is judged that the refrigerant quantity judging operation has not stabilized. | 05-21-2009 |
20090211282 | Hot water supply system - A hot water supply system ( | 08-27-2009 |
20090260376 | AIR CONDITIONER - An air conditioner includes a refrigerant circuit, a refrigerant quantity calculating section, and a refrigerant quantity judging section. The refrigerant circuit includes a compressor, an outdoor heat exchanger, an indoor expansion valve, and an indoor heat exchanger interconnected together. The refrigerant quantity calculating section calculates the refrigerant quantity in the refrigerant circuit taking into account a dissolved refrigerant quantity that is the quantity of refrigerant dissolved in the refrigerating machine oil in the compressor, based on an operation state quantity of constituent equipment or refrigerant flowing in the refrigerant circuit. The refrigerant quantity judging section judges the adequacy of the refrigerant quantity in the refrigerant circuit based on the refrigerant quantity calculated by the refrigerant quantity calculating section. In addition, the refrigerant quantity calculating section calculates the dissolved refrigerant quantity based on operation state quantities that include at least the ambient temperature outside the compressor. | 10-22-2009 |
20090272135 | AIR CONDITIONER - An air conditioner refrigerant circuit performs a cooling operation in which an outdoor heat exchanger functions as a condenser of the refrigerant compressed in a compressor and an indoor heat exchanger functions as an evaporator of the refrigerant condensed in the outdoor heat exchanger. Further, an outdoor expansion valve is disposed at a position that is at once downstream of the outdoor heat exchanger and upstream of a liquid refrigerant communication pipe in the refrigerant flow direction in the refrigerant circuit in the cooling operation, and shuts off the refrigerant flow. A refrigerant detection unit is disposed upstream of the outdoor expansion valve and detects the amount or the amount-related value of refrigerant accumulated upstream of the outdoor expansion valve. | 11-05-2009 |
20090308088 | AIR CONDITIONER - An air conditioner is provided with a refrigerant circuit and an operation controller. The refrigerant circuit includes a heat source unit, a refrigerant communication pipe, an expansion mechanism, and a utilization unit. The heat source unit has a compression mechanism and a heat source side heat exchanger. The heat source unit is connected to the refrigerant communication pipe. The utilization unit has a utilization side heat exchanger and is connected to the refrigerant gas communication pipe. The operation controller performs an oil-return operation in advance for returning oil pooled in the refrigerant circuit when a refrigerant quantity judging operation is carried out for judging the refrigerant quantity inside the refrigerant circuit. | 12-17-2009 |
20090314017 | AIR CONDITIONER - An air conditioner is provided with a refrigerant circuit, refrigerant stagnation judging means, and an operation controller. The refrigerant circuit is a circuit that includes a heat source unit, a refrigerant communication pipe, an expansion mechanism, and a utilization unit. A heat source unit and a utilization unit are connected to the refrigerant fluid communication pipes. The heat source unit has a compression mechanism and a heat source side heat exchanger. The refrigerant stagnation judging means can judge whether the refrigerant has stagnated inside the compression mechanism. The operation controller performs a refrigerant de-stagnation operation for eliminating stagnation of the refrigerant in the case that the refrigerant stagnation judging means has judged in advance that the refrigerant inside the compression mechanism has stagnated when a refrigerant quantity judging operation is carried out for judging the refrigerant quantity inside the refrigerant circuit. | 12-24-2009 |
20100154447 | AIR CONDITIONER - An air conditioner performs a refrigerant quantity judging operation to judge the refrigerant quantity in a refrigerant circuit, and includes a heat source unit, utilization units, expansion mechanisms, a first refrigerant gas pipe, a second refrigerant gas pipe, a refrigerant liquid pipe, switching mechanisms, temperature detecting means, and a controller. The heat source unit includes a compression means and a heat source side heat exchanger. The first refrigerant gas pipe is connected to the discharge side of the compression means. The switching mechanism can switch between a first state and a second state. The temperature detecting means are mounted on the first refrigerant gas pipe, and configured to detect a refrigerant temperature on the first refrigerant gas pipe side and output a refrigerant temperature detection value. The controller corrects the refrigerant quantity judged by a refrigerant quantity judging operation based on the refrigerant temperature detection value. | 06-24-2010 |
20100223940 | AIR CONDITIONER - An air conditioner is provided that is capable of allowing an operator to know, during a refrigerant charging operation using a cylinder, that the refrigerant cylinder is emptied without using a scale or the like. An air conditioner in which the refrigerant is charged using a cylinder containing the refrigerant includes a refrigerant circuit, a charge port, a downstream temperature sensor, an outdoor side controller, and a display unit. The refrigerant circuit is configured by the interconnection of a compressor, an outdoor side heat exchanger, an indoor side expansion valve, and an indoor side heat exchanger. The charge port is a port for charging the refrigerant into the refrigerant circuit from the cylinder. The downstream temperature sensor is provided in the vicinity of the charge port of the refrigerant circuit. The outdoor side controller judges whether or not the cylinder is emptied based on a change in at least one of a temperature detected by the downstream temperature sensor or a superheating degree. The display unit performs output when it is judged by the outdoor side controller that the cylinder is emptied. | 09-09-2010 |
20100275626 | AIR CONDITIONING APPARATUS AND REFRIGERANT QUANTITY DETERMINATION METHOD - An air conditioning apparatus includes a refrigerant circuit, first and second shut-off mechanisms, a communication pipe and a refrigerant detection mechanism. The refrigerant circuit is configured to at least perform a cooling operation. The first shut-off mechanism is downstream of the receiver and upstream of the liquid refrigerant connection pipe when the cooling operation is performed. The second shut-off mechanism is downstream of the heat source-side heat exchanger and upstream of the receiver when the cooling operation is performed. The communication pipe interconnects the refrigerant circuit between the first and second shut-off mechanisms, and the refrigerant circuit on the suction side of the compressor. The refrigerant detection mechanism is upstream of the second shut-off mechanism when the cooling operation is performed. The refrigerant detection mechanism is configured to detect a state quantity relating to the quantity of the refrigerant existing on the upstream side of the second shut-off mechanism. | 11-04-2010 |
20110000234 | AIR CONDITIONING APPARATUS AND REFRIGERANT QUANTITY DETERMINATION METHOD - An air conditioning apparatus and a refrigerant quantity determination method are provided, whereby a refrigerant quantity can be determined in a simple and accurate manner without compromising the reliability of a compressor. A refrigerant circuit ( | 01-06-2011 |
20110000240 | AIR CONDITIONING APPARATUS - An air conditioning apparatus includes a refrigerant circuit, an operation controlling device and a liquid refrigerant accumulation determining device. The refrigerant circuit has an accumulator. The operation controlling device performs normal operation control where each device of the heat source unit and the utilization unit are controlled in accordance with operating load of the utilization unit, and refrigerant quantity determination operation control where properness of quantity of the refrigerant in the refrigerant circuit is determined while performing the cooling operation. The liquid refrigerant accumulation determining device determines whether or not liquid refrigerant is accumulating in the accumulator. When it has been determined that liquid refrigerant is accumulating in the accumulator, liquid refrigerant accumulation control is performed to eliminate liquid refrigerant accumulation in the accumulator. | 01-06-2011 |