| 摘要 |
PROBLEM TO BE SOLVED: To maintain refrigerating capacity even when a device is replaced with a refrigerating device for an HFC-based refrigerant in an existing indoor facility and indoor piping designed for an HCFC-based refrigerant, to prevent the degradation of operating efficiency due to the increase of a pressure loss by suppressing the increase of a flow rate of the refrigerant, and to stably operate the indoor facility by keeping constant the temperature of the refrigerant flowing through the indoor facility. SOLUTION: The predetermined refrigerant temperature of a liquid refrigerant that can supply the refrigerating capacity required by the indoor facility of a main refrigerating cycle 1 is set, and the refrigerating capacity of a compressor 300 of an auxiliary refrigerating cycle 3 is reduced when the refrigerant temperature is lower than the predetermined refrigerant temperature so that the refrigerant temperature of a main refrigerating cycle side outlet of a supercooling heat exchanger 305 is the same as the predetermined refrigerant temperature. The indoor facility can thereby be supplied with stable refrigerating capacity. COPYRIGHT: (C)2009,JPO&INPIT
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