| 摘要 |
PROBLEM TO BE SOLVED: To provide a refrigerant cycle device capable of being efficiently operated in both high temperature/low temperature states by using a natural refrigerant such as carbon dioxide and hydrocarbon or ammonia. SOLUTION: This refrigerant cycle device 1 comprises a refrigerant circuit having compressors 2 and 8, a gas cooler 3, a cascade heat exchanger 6, expansion valves 4 and 11, and an evaporator 12. Hydrocarbon or ammonia and carbon dioxide are used as the refrigerant, the compressed hydrocarbon or ammonia is heat-radiated by heat absorbing action in the processes of the compression, and heat radiation, condensation, and evaporation of the carbon dioxide to condense and evaporate the hydrocarbon or ammonia. COPYRIGHT: (C)2005,JPO&NCIPI
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