초록 ▼

A gas-injection type refrigeration-cycle device has heat exchanger where refrigerant extracts waste heat from heating devices. In the refrigeration-cycle device, the mode is changed between where lower-pressure refrigerant extracts heat and where intermediate-pressure refrigerant extracts the heat o

A gas-injection type refrigeration-cycle device has heat exchanger where refrigerant extracts waste heat from heating devices. In the refrigeration-cycle device, the mode is changed between where lower-pressure refrigerant extracts heat and where intermediate-pressure refrigerant extracts the heat of the hot water. The lower-pressure refrigerant is drawn into compressor, after heat exchanger is set at the lower-pressure side of the refrigeration cycle. The intermediate-pressure refrigerant is introduced into compressor-gas-injection port, after heat exchanger is set at the intermediate-pressure side of the refrigeration cycle. In another aspect, a defrosting mode of outdoor heat exchanger includes a heating mode, and gas refrigerant discharged from compressor flows through condenser without heat exchange. Thereafter, the flow of the gas refrigerant is divided to two portions, and the gas refrigerant of one portion flows into outdoor heat exchanger, thereby defrosting outdoor heat exchanger. The other portion flows into evaporator, thereby heating blown air within an air-conditioning duct by evaporator.

대표청구항 ▼

1. 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-ex

1. 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.