Air-conditioning apparatus

Abstract

An air-conditioning apparatus includes a refrigerant circuit in which a compressor, a heat source side heat exchanger, an expansion device, and a load side heat exchanger are connected sequentially by a pipe, the refrigerant circuit being filled with a non-azeotropic refrigerant mixture as refrigerant, the air-conditioning apparatus including: a first pressure detection device configured to detect a pressure of refrigerant on a discharge side of the compressor or detect a pressure of refrigerant on a suction side of the compressor; an outdoor-air temperature detection device configured to detect an outdoor-air temperature; and a controller configured to execute a refrigerant leakage detection function of determining whether there is refrigerant leakage based on a pressure detected by the first pressure detection device and an outdoor-air temperature detected by the outdoor-air temperature detection device, when the air-conditioning apparatus is deactivated.

1 . An air-conditioning apparatus including a refrigerant circuit in which a compressor, a heat source side heat exchanger, an expansion device, and a load side heat exchanger are connected sequentially by a pipe, the refrigerant circuit being filled with a non-azeotropic refrigerant mixture as refrigerant, the air-conditioning apparatus comprising:
 a first pressure detection device configured to detect a pressure of refrigerant on a discharge side of the compressor or detect a pressure of refrigerant on a suction side of the compressor;   an outdoor-air temperature detection device configured to detect an outdoor-air temperature; and   a controller configured to execute a refrigerant leakage detection function of determining whether there is refrigerant leakage based on a pressure detected by the first pressure detection device and an outdoor-air temperature detected by the outdoor-air temperature detection device, when the air-conditioning apparatus is deactivated,   wherein the controller is configured to, in execution of the refrigerant leakage detection function, determine whether there is refrigerant leakage when the outdoor-air temperature detected by the outdoor-air temperature detection device is stable after a lapse of a first time set in advance from when the air-conditioning apparatus is deactivated.   
     
     
         2 . The air-conditioning apparatus of  claim 1 , wherein the controller is configured to, in execution of the refrigerant leakage detection function, determine whether there is refrigerant leakage by comparing a saturation temperature of refrigerant obtained from a pressure detected by the first pressure detection device with an outdoor-air temperature detected by the outdoor-air temperature detection device. 
     
     
         3 . (canceled) 
     
     
         4 . (canceled) 
     
     
         5 . The air-conditioning apparatus of  claim 1 , comprising an accumulator located on the suction side of the compressor. 
     
     
         6 . The air-conditioning apparatus of  claim 1 , comprising a temperature detection device in addition to the outdoor-air temperature detection device, wherein
 the outdoor-air temperature detection device has higher detection accuracy than the temperature detection device.   
     
     
         7 . The air-conditioning apparatus of  claim 1 , comprising a pressure detection device in addition to the first pressure detection device, wherein
 the first pressure detection device has higher detection accuracy than the pressure detection device.   
     
     
         8 . The air-conditioning apparatus of  claim 1 , wherein the controller is configured to
 execute a regular inspection function of executing the refrigerant leakage detection function every second time set in advance.   
     
     
         9 . The air-conditioning apparatus of  claim 1 , wherein the controller is configured to
 execute the refrigerant leakage detection function and announce an occurrence of refrigerant leakage when determining that there is refrigerant leakage.