Air-conditioning apparatus

Abstract

An air-conditioning apparatus in which a labor required for system selection is simplified is provided. An air-conditioning apparatus 100 according to the present invention has at least one intermediate heat exchanger 15 that exchanges heat between a refrigerant and a heat medium, a refrigeration cycle in which a compressor 10 , a heat-source side heat exchanger 12 , an expansion valve 16 e , and a refrigerant-side channel of the intermediate heat exchanger 15 are connected through refrigerant pipelines 4 through which the refrigerant flows, and a heat medium circulation circuit in which a heat medium-side channel of the intermediate heat exchanger 15 , a pump 21 , and a use-side heat exchanger 26 are connected through pipelines 5 through which the heat medium flows, in which the compressor 10 and the heat-source side heat exchanger 12 are contained in a heat source device 1 , the intermediate heat exchanger 15 and the pump 21 in a relay unit 3 , and the use-side heat exchanger 26 in an indoor unit 2 , respectively, and an expansion tank 6 that absorbs volume change of the heat medium is connected to the heat medium circulation circuit.

1 . An air-conditioning apparatus comprising:
 an intermediate heat exchanger for heating and an intermediate heat exchanger for cooling that make a refrigerant and a heat medium different from said refrigerant exchange heat;   a refrigeration cycle in which a compressor, an outdoor heat exchanger, at least one expansion valve, and a refrigerant-side channel of said intermediate heat exchanger are connected by pipelines through which said refrigerant flows; and   a heat medium circulation circuit in which a heat medium-side channel of said intermediate heat exchanger, a pump, and a use-side heat exchanger are connected by pipelines through which said heat medium flows, wherein   said compressor and said outdoor heat exchanger are contained in an outdoor unit;   said intermediate heat exchanger and said pump are contained in a relay unit;   said use-side heat exchanger is contained in an indoor unit, respectively; and   an expansion absorption device that absorbs volume change in both said heat medium heated and said heat medium cooled is connected to the suction side of said pump of said heat medium circulation circuit.   
     
     
         2 . (canceled) 
     
     
         3 . The air-conditioning apparatus of  claim 1 , wherein
 said relay unit is divided into a first relay unit and a second relay unit;   a gas-liquid separator that separates the refrigerant into a gas and a liquid is contained in said first relay unit; and   said intermediate heat exchanger and said pump are contained in said second relay unit, respectively.   
     
     
         4 . The air-conditioning apparatus of  claim 3 , wherein
 said outdoor unit and said first relay unit are connected by two pipelines, which are inbound and outbound paths for the refrigerant; and   said second relay unit and each of said indoor units are connected by two pipelines, which are inbound and outbound paths for the heat medium.   
     
     
         5 . The air-conditioning apparatus of  claim 1 , wherein
 said outdoor unit and said relay unit are connected by at least three pipelines, which are inbound and outbound paths for the refrigerant; and   said relay unit and each of said indoor units are connected by two pipelines, which are inbound and outbound paths for the heat medium.   
     
     
         6 . The air-conditioning apparatus of  claim 1 , wherein
 said expansion absorption device is connected so as to communicate with a suction side of said pump.   
     
     
         7 . The air-conditioning apparatus of  claim 1 , wherein
 said expansion absorption device is an expansion tank.   
     
     
         8 . The air-conditioning apparatus of  claim 7 , wherein
 a capacity of said expansion tank is 5 liters or less.   
     
     
         9 . The air-conditioning apparatus of  claim 7 , wherein
 in the air-conditioning apparatus having said indoor unit arranged higher than said expansion tank, a height difference between said expansion tank and said indoor unit is 10 m or less.   
     
     
         10 . The air-conditioning apparatus of  claim 1 , wherein
 the pressure of the heat medium when being supplied to said heat medium circulation circuit is 100 kPaG.