Patent ID: 7069983

Claim:
An air conditioner comprising: a refrigerant cycle having: an evaporator which is disposed in a blowing duct and cools by refrigerant evaporation; a compressor setting the evaporated refrigerant at high temperature and high pressure; a first refrigerant-to-water heat exchanger heating cooling water by heat transfer from the refrigerant discharged from said compressor; a first expansion device controlling the decompression of the refrigerant discharged from said first heat exchanger; a second refrigerant-to-water heat exchanger transferring heat between the refrigerant discharged from said first expansion device and the cooling water; a second expansion device controlling decompression of the refrigerant discharged from said second heat exchanger; an evaporator inlet refrigerant temperature detection means of measuring a temperature of the refrigerant of which decompression is controlled by said second expansion device; a control means of controlling said first expansion device and said second expansion device using a value detected by said evaporator inlet refrigerant temperature detection means, and a cooling water cycle having: a heater core which is disposed on the downstream side of said evaporator on the basis of a blowing direction in said blowing duct and which heats blowing air by the heated cooling water; a radiator cooling the cooling water; a pump circulating the cooling water cooled by said radiator; a power engine cooled by the cooling water fed by said pump; and said first heat exchanger and said second heat exchanger.