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Refrigeration-cycle device

  • US 6,347,528 B1
  • Filed: 07/24/2000
  • Issued: 02/19/2002
  • Est. Priority Date: 07/26/1999
  • Status: Expired due to Term
First Claim
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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.

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