Patent ID: 9587861
Date: 2017-03-07
CPC Classifications: F25B

Claim:
1. An air-conditioning apparatus comprising: a refrigerant circuit in which a compressor, a first refrigerant flow switching device, a heat source side heat exchanger, a plurality of expansion devices, refrigerant passages of a plurality of heat exchangers related to heat medium, and a plurality of second refrigerant flow switching devices are connected by refrigerant pipes to circulate refrigerant; a heat medium circuit in which a pump, a plurality of use side heat exchangers, heat medium side passages of the plurality of heat exchangers related to heat medium, and a plurality of heat medium flow switching devices arranged on the inlet side and the outlet side of the plurality of use side heat exchangers are connected by heat medium pipes to circulate a heat medium; and a controller configured to calculate an opening-degree correction value for the plurality of heat medium flow switching devices on the basis of a temperature of the heat medium flowing out from the plurality of heat exchangers related to the heat medium, wherein the plurality of heat exchangers related to heat medium exchange heat between the refrigerant and the heat medium, wherein the refrigerant circuit branches into a plurality of refrigerant passages including at least a first refrigerant passage and a second refrigerant passage, wherein each first refrigerant passage connects to a corresponding expansion device and to a corresponding second refrigerant flow switching device through a first heat exchanger related to heat medium connected between the corresponding expansion device and the corresponding second refrigerant flow switching device of each first refrigerant passage, wherein each second refrigerant passage connects to a corresponding expansion device and to a corresponding second refrigerant flow switching device through a second heat exchanger related to heat medium connected between the corresponding expansion device and the corresponding second refrigerant flow switching device of each first refrigerant passage, wherein the air-conditioning apparatus is configured such that pressure loss in a refrigerant passage of the second heat exchanger related to heat medium is larger than pressure loss in a refrigerant passage of the first heat exchanger related to heat medium and such that the refrigerant passage of the second heat exchanger related to heat medium has a longer passage length in a flow direction than the refrigerant passage of the first heat exchanger related to heat medium, and while the flow rate of the refrigerant of the refrigerant passage of the first heat exchanger related to heat medium is substantially the same as the flow rate of the refrigerant of the refrigerant passage of the second heat exchanger related to heat medium, and wherein the controller is configured to control simultaneously, in accordance with the opening-degree correction value, an opening degree of all of the plurality of heat medium flow switching devices corresponding to the plurality of use side heat exchangers through which the heat medium flowing out from the plurality of heat exchangers related to heat medium circulates.