| 摘要 |
A refrigerator circuit ( 110 ) and a freezing circuit ( 30 ) are connected to an outdoor circuit ( 40 ) in parallel in a refrigerant circuit ( 20 ), and a freezer circuit ( 130 ) and a booster circuit ( 140 ) are connected in series in the freezing circuit ( 30 ). The booster circuit ( 140 ) includes a booster compressor ( 141 ) and three-way switching mechanisms ( 142, 160 ). During cooling operation of a freezing heat exchanger ( 131 ), first operation is performed in the three-way switching mechanisms ( 142, 160 ) so that the refrigerant evaporated in the freezing heat exchanger ( 131 ) is compressed in the booster compressor ( 141 ) and is sucked into a variable capacity compressor ( 41 ). During defrosting of the freezing heat exchanger ( 131 ), second operation is performed in the three-way switching mechanisms ( 142, 160 ) so that the refrigerant evaporated in the refrigeration heat exchanger ( 111 ) is compressed in the booster compressor ( 141 ), is supplied to the freezing heat exchanger ( 131 ), and then, is sent back to the refrigeration heat exchanger ( 111 ).
|
