Patent ID: 6347528
Filing Date: 2002-02-19
Classification: B60H,B60L,F25B,F28D,Y02B,Y02T

Abstract:
A refrigeration-cycle device comprising:an air-conditioning duct channeling air into a passenger compartment; a blower blowing air through said air-conditioning duct; a compressor having a gas-injection port for introducing intermediate-pressure refrigerant into said compressor; an indoor heat-exchanger disposed within said air-conditioning duct which heats air with higher-pressure gas refrigerant discharged from said compressor during a heating mode; outdoor heat exchanger which evaporates lower-pressure refrigerant by extracting heat from outside air during heating; and heat-exchanging means where refrigerant extracts heat from a waste-heat recovering fluid containing heat recovered from a heating device; a plurality of changeable operation modes including a lower-pressure-side heat-extraction heat-pump mode, an intermediate-pressure-side heat-extraction heat-pump mode and a gas-injection heat-pump mode; wherein said heat-exchanging means is set to a lower-pressure side and lower-pressure refrigerant drawn into said compressor which has extracted heat from the waste-heat recovering fluid, when in the lower-pressure-side heat-extraction heat-pump mode; wherein said heat-exchanging means is set in an intermediate-pressure side and intermediate-pressure refrigerant is introduced into said compressor-gas-injection port which has extracted heat from the waste-heat recovering fluid, when in the intermediate-pressure-side heat-extraction heat-pump mode; and wherein heat extraction from the waste-heat recovering fluid is stopped and the intermediate-pressure refrigerant is drawn into said gas-injection port when in the gas-injection heat-pump mode.