| 摘要 |
PROBLEM TO BE SOLVED: To restrain reduction in efficiency by this refrigerating device.SOLUTION: An air conditioning apparatus 1 includes a four-stage compressor 2, switching mechanisms 31-33, a liquid gas heat exchanger 6b, bypass lines 142 and 162, and a control part. In the four-stage compressor 2, one high-stage side compression mechanism 24 is connected in series with a plurality of low-stage side compression mechanisms 21-23, respectively. The switching mechanisms 31-33 switch a cooling operation cycle and a heating operation cycle. The liquid gas heat exchanger 6b exchanges heat between a low pressure refrigerant sucked in the low-stage side compression mechanisms 21-23 and a high pressure refrigerant. The bypass lines 142 and 162 bypass the suction side and the delivery side of the liquid gas heat exchanger 6b. The bypass lines 142 and 162 do not bypass the refrigerant in the cooling operation cycle, and bypass a partial refrigerant in the heating operation cycle. The control part controls the four-stage compressor 2 and the switching mechanisms 31-33. |
