| 摘要 |
PROBLEM TO BE SOLVED: To increase an economizer effect in a double-stage compression type freezing cycle. SOLUTION: Discharged gas at a lower stage compressor and a double-phase refrigerant at an intermediate pressure are pre-mixed to each other, gas and liquid are separated by a gas-liquid separator (24), wherein the liquid refrigerant is supplied to an evaporator (13) and the gaseous refrigerant is supplied to a higher stage compressor (21).
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