| 摘要 |
PROBLEM TO BE SOLVED: To keep refrigeration power even when a device is replaced by a refrigerating device for a HFC refrigerant in existing indoor equipment and indoor piping designed for a HCFC refrigerant, to prevent degradation of operation efficiency caused by increase of pressure loss by preventing increase of the flow rate of the refrigerant, and to stably operate the indoor equipment by keeping the temperature of the refrigerant circulated in the indoor equipment constant. SOLUTION: A saturation temperature of the refrigerant is obtained from refrigerant pressure of an outlet on a main refrigerating cycle side of a supercooling heat exchanger, a supercooling degree of the refrigerant on the outlet side is calculated from the refrigerant pressure and a refrigerant temperature on the outlet side, and an opening of a pressure reducing device of a sub-refrigerating cycle is decreased when the difference in the refrigerant temperatures between an inlet side and the outlet side of the main refrigerating cycle is large so that the supercooling degree becomes constant, thus a liquid refrigerant having a constant supercooling degree can be supplied to the indoor equipment of the main refrigerating cycle. COPYRIGHT: (C)2009,JPO&INPIT
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