| 摘要 |
An air-conditioning apparatus includes a refrigeration cycle device having a refrigerant circuit A in which a compressor 10 that pressurizes a zeotropic refrigerant mixture containing tetrafluoropropene and R32, a heat source side heat exchanger 12, refrigerant expansion devices 16, and heat exchangers 15 related to heat medium that exchange heat between the refrigerant and a heat medium are connected by pipes, the refrigeration cycle device further including a high-pressure side pressure detection device 32 that detects high-pressure side pressure, a low-pressure side pressure detection device 33 that detects low-pressure side pressure, a high-low pressure bypass pipe 4c connecting a pipe on a discharge side of the compressor 10 and a pipe on a suction side of the compressor 10, a bypass expansion device 14 disposed in the high-low pressure bypass pipe 4c, a high-pressure side temperature detection device 37 that detects high-pressure side temperature, and a low-pressure side temperature detection device 38 that detects low-pressure side temperature; an outdoor unit side controller that detects circulation composition of the refrigerant on the basis of the high-pressure side pressure, the low-pressure side pressure, the high-pressure side temperature, and the low-pressure side temperature; and a relay unit side controller performing at least one of a calculation of evaporating temperature and degree of superheat, and a calculation of condensing temperature and degree of subcooling on the basis of the circulation composition. |
