Patent ID: 9732992
Date: 2017-08-15
CPC Classifications: F24F,F25B

Claim:
1. An air-conditioning apparatus comprising: a refrigerant circuit in which a compressor, a refrigerant passage switching device that switches a passage of a refrigerant discharged from the compressor, a first heat exchanger, a first expansion device, and a refrigerant flow passage of a second heat exchanger are connected via a refrigerant pipe through which the refrigerant is distributed; a heat transfer medium circuit in which a heat transfer medium flow passage of the second heat exchanger and a heat transfer medium sending device are connected via a heat transfer medium pipe through which a heat transfer medium is distributed, and to which a use side heat exchanger is connected; a heat transfer medium passage reversing device that is disposed in the heat transfer medium circuit and that is configured to switch a direction of the heat transfer medium flowing through the heat transfer medium flow passage of the second heat exchanger between a normal direction and a reverse direction; a controller configured to control the heat transfer medium passage reversing device to switch the direction of the heat transfer medium flowing through the heat transfer medium flow passage of the second heat exchanger; and a freezing determination processor configured to determine whether or not there is a possibility of freezing of the heat transfer medium flowing through the heat transfer medium flow passage of the second heat exchanger, wherein the refrigerant flowing through the refrigerant circuit is a non-azeotropic refrigerant mixture including a plurality of components and having a temperature glide between a saturated gas temperature and a saturated liquid temperature at the same pressure, and wherein in a condition where the second heat exchanger serves as a cooler that cools the heat transfer medium, the controller is configured to