| 摘要 |
A vapor compression refrigerating system having a compressor, a radiator, a first pressure reducing mechanism for reducing a pressure of refrigerant cooled by the radiator, a refrigerant branching means for dividing refrigerant (m) reduced in pressure by the first pressure-reducing mechanism into portions, a second pressure reducing mechanism for reducing a pressure of one portion of refrigerant (m 1 ), and a third pressure reducing mechanism for reducing a pressure of another portion of refrigerant (m 2 ). One portion and pressure reduced refrigerant (m 1 ') exchanges heat in a cooler with refrigerant present between the first and third pressure reducing mechanisms, and another portion and pressure reduced refrigerant (m 2 ') is evaporated by an evaporator. The evaporated refrigerant (m 2 '') and the refrigerant (m 1 ') having passed through the cooler are mixed by a gas/liquid separator, and the mixed refrigerant is introduced into the compressor. In a vapor compression refrigerating system using carbon dioxide, the degree of refrigerant superheating at a suction side of the compressor may be reduced, and a coefficient of performance of the refrigerating cycle may be increased.
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