| 摘要 |
Provided is a two-stage pressure buildup refrigeration cycle apparatus that comprises: a lower-stage compressor (1); a higher-stage compressor (2); a condenser (3); a main expansion valve (9); a sub expansion value (5); an evaporator (10); a condenser fan (3f); and a control device (7). When the demand for refrigeration performance is low, the control device controls the lower-stage compressor and the higher-stage compressor in a COP improvement operation mode in which, on the basis of the refrigerant discharge performance of either of the lower-stage compressor and the higher-stage compressor, the control device determines the refrigerant discharge performance of the other of the lower-stage compressor and the higher-stage compressor in order to improve COP. When the demand for refrigeration performance is high, the control device controls the lower-stage compressor and the higher-stage compressor in a high performance operation mode in which the control device first increases the refrigerant discharge rate of the lower-stage compressor, and then increases the refrigerant discharge rate of the higher-stage compressor. |
