| 摘要 |
PROBLEM TO BE SOLVED: To prevent a malfunction such as heating capacity insufficiency due to liquid injection while a pressure is increasing, and also to prevent complication of a device structure, in a refrigeration system 1 provided with a refrigerant circuit 10 composed by connecting a compressor 11, a condenser 12, a supercooling heat exchanger 34, an expansion mechanism 13, and an evaporator 14 in sequence, and also composed to carry out defrosting operation and heating operation by introducing a hot gas into the evaporator 14. SOLUTION: A gas injection passage 38 is provided which introduces a gas refrigerant into the compressor 11 from a gas side passage 34b of the supercooling heat exchanger 34 when a discharge temperature of the refrigerant becomes lower than a predetermined value owing to carrying out liquid injection during hot gas introducing operation such as defrosting operation and heating operation. COPYRIGHT: (C)2009,JPO&INPIT
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