| 摘要 |
In a refrigerant circuit (20), a refrigerator chamber circuit (110) and a freezing circuit (30) are connected in parallel with an outdoor circuit (40). In the freezing circuit (30), a freezing chamber circuit (130) and a booster circuit (140) are connected in series. The booster circuit (140) is provided with a booster compressor (141) and a four-way switching valve (142). During operation for cooling the chamber air by a freezing heat exchanger (131), the refrigerant evaporated in the freezing heat exchanger (131) is compressed in the booster compressor (141) and then drawn into a variable capacity compressor (41). On the other hand, during defrosting of the freezing heat exchanger (131), the refrigerant evaporated in the refrigerating heat exchanger (111) is compressed in the booster compressor (141) and then supplied to the freezing heat exchanger (131). The refrigerant condensed in the freezing heat exchanger (131) during defrosting is sent back to the refrigerating heat exchanger (111).
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