Refrigeration cycle apparatus

Abstract

A refrigeration cycle apparatus includes a heat source unit including a compressor, a flow switching valve, a first heat exchanger, and an expansion valve, an air-conditioning unit including a second heat exchanger and configured to perform air-conditioning, and a hot water supply unit including a third heat exchanger and configured to supply hot water. The flow switching valve includes a first port connected to a discharge port of the compressor, a second port connected to the second heat exchanger, a third port connected to a suction port of the compressor, and a fourth port connected to the first heat exchanger. The flow switching valve is set to one of a first state in which the second port communicates with the third port, the third port communicates with the fourth port, and the first port does not communicate with any ports, a second state in which the first port communicates with the fourth port, and the second port communicates with the third port, and a third state in which the first port communicates with the second port, and the third port communicates with the fourth port.

1 . A refrigeration cycle apparatus comprising:
 a heat source unit including a compressor, a flow switching valve, a first heat exchanger, and an expansion valve;   an air-conditioning unit including a second heat exchanger and configured to perform air-conditioning; and   a hot water supply unit including a third heat exchanger and configured to supply hot water;   wherein the flow switching valve includes   a first port connected to a discharge port of the compressor,   a second port connected to the second heat exchanger,   a third port connected to a suction port of the compressor, and   a fourth port connected to the first heat exchanger, and   wherein the flow switching valve is set to one of   a first state in which the second port communicates with the third port, the third port communicates with the fourth port, and the first port does not communicate with any ports,   a second state in which the first port communicates with the fourth port, and the second port communicates with the third port, and   a third state in which the first port communicates with the second port, and the third port communicates with the fourth port.   
     
     
         2 . The refrigeration cycle apparatus of  claim 1 , further comprising:
 a controller configured to control operations of the heat source unit, the air-conditioning unit, and the hot water supply unit,   wherein the controller is configured to perform a hot water supply operation in which hot water supply is performed by the hot water supply unit, a cooling operation in which cooling is performed by the air-conditioning unit, and a heating operation in which heating is performed by the air-conditioning unit, and   wherein the controller is configured to set the flow switching valve to   the first state in the hot water supply operation,   the second state in the cooling operation, and   the third state in the heating operation.   
     
     
         3 . The refrigeration cycle apparatus of  claim 2 , further comprising:
 an on-off valve provided on a pipe that is branched from a pipe connecting the discharge port of the compressor and the first port of the flow switching valve, and that is connected to the third heat exchanger,   wherein the controller is configured to   open the on-off valve in the hot water supply operation, and   close the on-off valve in the cooling operation and the heating operation.   
     
     
         4 . The refrigeration cycle apparatus of  claim 2 ,
 wherein the controller is configured to   perform a hot water supply cooling operation in which hot water supply by the hot water supply unit and cooling by the air-conditioning unit are performed concurrently, and   switch the flow switching valve to the first state or the second state in the hot water supply cooling operation according to a hot water supply load and a cooling load.   
     
     
         5 . The refrigeration cycle apparatus of  claim 2 ,
 wherein the controller is configured to   perform a hot water supply heating operation in which hot water supply by the hot water supply unit and heating by the air-conditioning unit are performed concurrently, and   set the flow switching valve to the third state in the hot water supply heating operation.   
     
     
         6 . The refrigeration cycle apparatus of  claim 2 ,
 wherein the expansion valve includes   a first expansion valve provided on an outlet side of the first heat exchanger in the cooling operation,   a second expansion valve provided on an outlet side of the second heat exchanger in the heating operation, and   a third expansion valve provided on a pipe that is branched from a pipe connecting the first expansion valve and the second expansion valve, and that is connected to the third heat exchanger, and   wherein the controller is configured to   close the third expansion valve in the cooling operation and the heating operation, and   close the second expansion valve in the hot water supply operation.   
     
     
         7 . The refrigeration cycle apparatus of  claim 6 ,
 wherein, in the hot water supply cooling operation in which hot water supply performed by the hot water supply unit and cooling performed by the air-conditioning unit are performed concurrently, the controller is configured to   close the first expansion valve when a hot water supply load and a cooling load are equal, and   open the first expansion valve when the hot water supply load and the cooling load are not equal.