| 摘要 |
A refrigeration device having a refrigerant circuit (20) of a vapor-compression refrigeration cycle where cooling circuit (70, 80) systems having cooling heat exchangers (72, 84), respectively, are parallelly connected to an outdoor circuit (30) having arranged in it an outdoor heat exchanger (32) and a compression mechanism (31). In at least one cooling circuit (70, 80) system, an auxiliary compressor (85) is connected in series to the cooling heat exchanger (84). In order for the refrigeration device to be able to cope with various defrost operation patterns without a defrost mechanism other than the refrigeration circuit (20), the device is provided with hot gas introduction paths (46, 89) for selectively introducing discharge gas refrigerant, discharged from the compression mechanism (31) of the outdoor circuit (30), to at least one of the cooling heat exchanger (72, 84). This enables defrost operation where a refrigeration cycle is operated using the cooling heat exchangers (72, 84) as condensers. ® KIPO & WIPO 2008
|
