To raise efficiency of a refrigeration cycle device by using properties of carbon dioxide gas (CO2) used as a refrigerant in relation to the common knowledge that a refrigeration cycle device using the carbon dioxide gas refrigerant (CO2) in a same constitution as that of a refrigeration cycle device using fluorocarbon gas or the like cannot attain a sufficient efficiency as a refrigeration cycle device due to physical properties of the carbon dioxide gas refrigerant (CO2).
The refrigeration cycle device comprises a compressor 1 for pressurizing the refrigerant, a radiator 2 for cooling the refrigerant pressurized by the compressor, an expansion device 3 disposed at a downstream side of the radiator in refrigerant flow for taking out power by decompressing and expanding the above cooled refrigerant, a pressure reducing valve 4 provided on a further downstream side of the expansion device and an evaporator 5 for heating the refrigerant decompressed by the pressure reducing valve which are sequentially connected with one another with piping.
HASEGAWA HIROSHI
SHINTAKU HIDENOBU
