| 摘要 |
A refrigerant circuit (10) has a compressor (30) where a low-stage side compression mechanism (34) and a high-stage side compression mechanism (35) are connected by a drive shaft (33) and also has a gas-liquid separator (15). The refrigerant circuit (10) performs a two-stage compression/two-stage expansion refrigeration cycle with a CO2 refrigerant set to a critical pressure. In the compressor (30), the volumetric ratio V2/V1 that is the ratio of the displacement volume V2 of the high-stage side compression mechanism (35) to the displacement volume V1 of the low-stage side compression mechanism (34) is set to a range that is higher than 0.8 and lower than 1.3.
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