| 摘要 |
PROBLEM TO BE SOLVED: To improve efficiency in construction, in a refrigerating unit 1 performing a supercritical refrigerating cycle in a refrigerant circuit 10 constituted by connecting an utilization unit 5 and a heat source unit 2 by communication pipes 6, 7. SOLUTION: A test operation for circulating a refrigerant in the refrigerant circuit 10 so that high pressure of the refrigerating cycle becomes higher than a critical pressure of the refrigerant, is performed in a noncondensable gas discharging step of a constructing process of this refrigerating unit 1. In the test operation, an opening of an outdoor expansion valve 26 is determined to allow the refrigerant flowing into a gas-liquid separator 25 to have a pressure lower than the critical pressure. The noncondensable gas existing in the refrigerant circuit 10 flows into the gas-liquid separator 25 with the refrigerant, and gas refrigerant and the noncondensable gas are separated from liquid refrigerant and accumulate at an upper space. The noncondensable gas is released to atmospheric air through a separation membrane 34b. COPYRIGHT: (C)2007,JPO&INPIT
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