Patent ID: 9335075
Filing Date: 2016-05-10
CPC Classification: F24D,F24F,F25B,H05K

Claim Text:
1. An air-conditioning apparatus comprising: a first refrigerant circuit in which a first compressor, a first refrigerant flow switching device, a heat source side heat exchanger, a plurality of first expansion devices, and refrigerant side passages of a plurality of first heat exchangers related to heat medium are connected by refrigerant pipes to circulate a first refrigerant; a first heat medium circuit in which a pump, a use side heat exchanger, heat medium side passages of the plurality of first heat exchangers related to heat medium, a heat medium flow control device disposed on an inlet side or an outlet side of the use side heat exchanger, and heat medium flow switching devices arranged on the inlet side and the outlet side of the use side heat exchanger are connected by heat medium pipes, and the pump, a heat medium side passage of a second heat exchanger related to heat medium, the heat medium side passages of the plurality of first heat exchangers related to heat medium, a heat medium flow control device disposed on an inlet side or an outlet side of the heat medium side passage of the second heat exchanger related to heat medium, and heat medium flow switching devices arranged on the inlet side and the outlet side of the heat medium side passage of the second heat exchanger related to heat medium are connected by heat medium pipes to circulate a first heat medium; and a second refrigerant circuit in which a second compressor, a refrigerant side passage of a third heat exchanger related to heat medium, a second expansion device, and a refrigerant side passage of the second heat exchanger related to heat medium are connected by refrigerant pipes to circulate a second refrigerant, the plurality of first heat exchangers related to heat medium exchange heat between the first refrigerant and the first heat medium and the second heat exchanger related to heat medium exchanges heat between the first heat medium and the second refrigerant to prevent the first refrigerant and the second refrigerant from mixing with each other, a second heat medium is allowed to flow through a heat medium side passage of the third heat exchanger related to heat medium, the third heat exchanger related to heat medium exchanges heat between the second refrigerant and the second heat medium to prevent the first heat medium and the second heat medium from mixing with each other, the first refrigerant and the second refrigerant undergo a two-phase change or a transition to a supercritical state during circulating in the first refrigerant circuit and the second refrigerant circuit, respectively, the first heat medium, in the heat medium side passage of the second heat exchanger related to heat medium, undergoes a single phase change, and the first heat medium and the second heat medium do not undergo a two-phase change or a transition to a supercritical state during circulating in the first heat medium circuit and circulating through the heat medium side passage of the third heat exchanger related to heat medium, respectively.