Patent application number | Description | Published |
20110296860 | HEAT PUMP SYSTEM - A heat pump system includes: a heat-source-side refrigerant circuit having a heat-source-side compressor, a first usage-side heat exchanger operable as a radiator of heat-source-side refrigerant, and a heat-source-side heat exchanger operable as a radiator of heat-source-side refrigerant; and a usage-side refrigerant circuit having a usage-side compressor, a refrigerant/water heat exchanger operable as a radiator of usage-side refrigerant to heat an aqueous medium, and the first usage-side heat exchanger operable as an evaporator of usage-side refrigerant by radiation of heat-source-side refrigerant. The capacity of the heat-source-side compressor is controlled so that a saturation temperature corresponding to the pressure of the heat-source-side refrigerant in the discharge of the heat-source-side compressor becomes a target temperature; and the capacity of the usage-side compressor is controlled so that a saturation temperature corresponding to the pressure of the usage-side refrigerant in the discharge of the usage-side compressor becomes a target temperature. | 12-08-2011 |
20110296861 | HEAT PUMP SYSTEM - A heat pump system includes a heat source unit, a discharge refrigerant communication tube, a liquid refrigerant communication tube, a gas refrigerant communication tube, a first usage unit and a second usage unit. The first usage unit has a first usage-side heat exchanger capable of functioning as a radiator of the heat-source-side refrigerant introduced from the discharge refrigerant communication tube. The first usage unit is capable of performing operation in which an aqueous medium is heated by radiation of the heat-source-side refrigerant in the first usage-side heat exchanger. The second usage unit has a second usage-side heat exchanger capable of functioning as an evaporator of the heat-source-side refrigerant introduced from the liquid refrigerant communication tube. The second usage unit is capable of performing operation in which an air medium is cooled by evaporation of the heat-source-side refrigerant in the second usage-side heat exchanger. | 12-08-2011 |
20110302943 | HEAT PUMP SYSTEM - A heat pump system includes: a heat-source-side refrigerant circuit having a heat-source-side compressor, a first usage-side heat exchanger operable as a radiator of heat-source-side refrigerant, and a heat-source-side heat exchanger operable as an evaporator of heat-source-side refrigerant; and a usage-side refrigerant circuit having a usage-side compressor arranged to compress usage-side refrigerant with a pressure of the usage-side refrigerant corresponding to a saturated gas temperature of 65° C. that is 2.8 MPa or less at gauge pressure, a refrigerant-water heat exchanger operable as a radiator of usage-side refrigerant to heat an aqueous medium, and a first usage-side heat exchanger operable as an evaporator of usage-side refrigerant by the radiation of heat-source-side refrigerant. The weight of usage-side refrigerant enclosed in the usage-side refrigerant circuit is one to three times the weight of refrigeration machine oil enclosed to lubricate the usage-side compressor. | 12-15-2011 |
20110302947 | HEAT PUMP SYSTEM - A heat pump system includes a refrigerant circuit, an inlet temperature sensor measuring a heat exchanger inlet temperature of an aqueous medium in a usage-side heat exchanger of the refrigerant circuit, an outlet temperature sensor measuring a heat exchanger outlet temperature of the aqueous medium in the usage-side heat exchanger, a variable-capacity circulating pump circulating the aqueous medium inside a hot-water circuit of a loop, and a controller. The controller controls refrigerant-side circulation rate in the refrigerant circuit to bring a temperature of the aqueous medium at the outlet of the usage-side heat exchanger to a targeted first target temperature, and operating capacity of the circulating pump to bring a medium temperature differential of the aqueous medium between the outlet and the inlet of the usage-side heat exchanger to a targeted second target temperature differential. | 12-15-2011 |
20110302948 | HEAT PUMP SYSTEM - A heat pump system includes a heat source unit, a first usage unit, and a second usage unit. The heat source unit has a heat-source-side compressor, a heat-source-side heat exchanger, a heat-source-side blower, and a heat-source-side switching mechanism. The first usage unit has at least a radiation amount adjusting element, and a first usage-side flow rate adjustment valve. The second usage unit has at least a second usage-side flow rate adjustment valve. In a case in which the second usage unit performs an air-cooling operation and the first usage unit performs an aqueous medium heating operation, the amount of radiation adjusted by the radiation amount adjusting element or operating capacity of the heat-source-side blower is controlled in accordance with a state of the first usage-side flow rate adjustment valve and the second usage-side flow rate adjustment valve. | 12-15-2011 |
20110302949 | HEAT PUMP SYSTEM - A heat pump system includes a first usage unit operable to perform a hot-water supply operation to heat an aqueous medium and a second usage unit operable to perform air-cooling and air-warming operations to cool or heat an air medium. The first and second usage units are both connected to a heat source unit in such a manner that the first and second usage units are incapable of individually selecting and performing a hot-water supply operation, an air-cooling operation, or an air-warming operation. The heat pump system is capable of switching operation to a thermoregulation mode different from the switched state of a heat-source-side switching mechanism in response to a thermoregulation mode command issued by a first usage-side controller, a second usage side controller or a centralized controller. | 12-15-2011 |
20120036876 | HEAT PUMP SYSTEM - A heat pump system includes a heat source unit having a variable-capacity compressor and a heat-source-side heat exchanger that functions as an evaporator for a refrigerant, and a plurality of usage units connected to the heat source unit and having usage-side heat exchangers that function as radiators for the refrigerant. The operating capacity of the compressor is controlled to bring the discharge pressure of the compressor, or a state quantity equivalent to the discharge pressure, to a first target value. The first target value is determined based on an equivalent target value equivalent to a usage temperature required in individual usage units. | 02-16-2012 |
20120260685 | HEAT PUMP SYSTEM - A heat pump system includes a heat-source-side refrigerant circuit and a controller. The heat-source-side refrigerant circuit has a plurality of usage units having usage-side heat exchangers. The plurality of usage units are connected to a heat source unit having a plurality of heat-source-side heat exchangers and a heat-source-side compressor configured to compress a heat-source-side refrigerant. The controller causes the plurality of heat-source-side heat exchangers to function as evaporators and radiators of heat-source-side refrigerant to perform an air-cooling operation and an air-warming operation using an aqueous medium. The heat pump system operates so that the heat-source-side condensing temperature is below | 10-18-2012 |
20120260688 | HEAT PUMP SYSTEM - A heat source unit has a capacity-variable heat source-side compressor and a heat source-side heat exchanger which functions as a radiator of refrigerant. Usage units are connected to the heat source unit and have usage-side heat exchangers, respectively, which function as evaporators of refrigerant and cool an aqueous medium. An operating capacity controller controls the capacity of the heat source-side compressor so that evaporation temperature of refrigerant of each of the usage-side heat exchangers reaches a first target evaporation temperature. A decision unit calculates second target evaporation temperatures at which outlet temperatures of the aqueous medium in the usage-side heat exchangers of the respective operating usage units reach predetermined set temperatures, and decides a minimum value of the second target evaporation temperatures as the first target evaporation temperature. | 10-18-2012 |
20120285186 | HEAT PUMP SYSTEM - A heat pump system includes a heat source unit, a usage-side unit, and a usage-side controller. The heat source unit has a heat source-side compressor for compressing a heat source-side refrigerant, and a heat source-side heat exchanger capable of functioning as an evaporator of the heat source-side refrigerant. The usage-side unit is connected to the heat source unit and has a capacity-variable-type usage-side compressor for compressing a usage-side refrigerant, a usage-side heat exchanger capable of functioning as a radiator of the heat source-side refrigerant and functioning as an evaporator of the usage-side refrigerant, and a refrigerant-water heat exchanger capable of functioning as a radiator of the usage-side refrigerant and heating an aqueous medium. The usage-side controller performs usage-side capacity variation control for incrementally varying the operating capacity of the usage-side compressor during a usual operation. | 11-15-2012 |