| 摘要 |
PROBLEM TO BE SOLVED: To provide a vapor compression type refrigerator capable of reducing defrosting operation time. SOLUTION: The refrigerator is constituted to stop hot water supply to a water refrigerant heat exchanger 20 during a defrosting operation, fully open a valve 61 in a stopped state of outside air blowing to an evaporator 40, and increase opening of an expansion valve 30 to a value that is equivalent to a pressure not higher than a withstanding pressure of the evaporator 40 and provides a temperature allowing heating of the evaporator 40. Thus, hot refrigerant that has little been cooled by the water refrigerant heat exchanger 20 is distributed and supplied to the evaporator 40 and an accumulator 50, so that hot refrigerant can be supplied also to the accumulator 50. As a result, many refrigerants having flown into the accumulator 50 can be suppressed from being condensed and liquified, so that gas phase refrigerant amount supplied from the accumulator 50 to a compressor 10 can be prevented from decreasing comparing with hot gas amount discharged from the compressor. Much hot gas can be supplied to the evaporator 40, so that the defrosting operation time can be reduced. COPYRIGHT: (C)2004,JPO
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