| 摘要 |
PROBLEM TO BE SOLVED: To provide a supercritical refrigerating device having improved durability while preventing the output degradation of a compressor in the state that an outside air temperature is low. SOLUTION: The supercritical refrigerating device comprises a branch part X via which refrigerant flowing out of a high pressure side heat exchanger 12 for cooling compressed refrigerant branches, a first depressurizer 13 for depressurizing one branching refrigerant, an evaporator 14 for evaporating the refrigerant depressurized by the first depressurizer, the two-stage compressor 11 for compressing the refrigerant flowing out of the evaporator into supercritical pressure at two high and low stages and discharging it to the high pressure side heat exchanger 12, a bypass circuit 16 for guiding the other branching refrigerant to an intermediate pressure part 11d of the two-stage compressor 11, an opening/closing valve 17 for opening/closing the bypass circuit, a second depressurizer 18 for depressurizing the refrigerant flowing in the bypass circuit 16, and a control means 3 for controlling the opening/closing operation of the opening/closing valve depending on the outside air temperature. COPYRIGHT: (C)2006,JPO&NCIPI
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