Patent ID: 9746193
Date: 2017-08-29
CPC Classifications: B23P,F24F,F25B

Claim:
1. An air-conditioning apparatus comprising: a refrigerant circuit in which a compressor, a heat-source-side heat exchanger, an expansion device, and a refrigerant flow path in at least one intermediate heat exchanger configured to cause heat exchange between a refrigerant and a heat medium are connected by a refrigerant pipe, the refrigerant circuit being configured to cause the refrigerant to circulate therethrough; and a heat medium circuit in which a pump, a use-side heat exchanger, and a heat-medium flow path in the at least one intermediate heat exchanger are connected by a heat-medium conveying pipe, the heat medium circuit being configured to cause the heat medium to circulate therethrough, wherein the at least one intermediate heat exchanger comprises a plurality of intermediate heat exchangers, the plurality of intermediate heat exchangers are operative in a heating only operation mode in which all of the intermediate heat exchangers serve as condensers, a cooling only operation mode in which all of the intermediate heat exchangers serve as evaporators, and a cooling and heating mixed operation mode in which some of the intermediate heat exchangers serve as condensers and others of the intermediate heat exchangers serve as evaporators, and the heat-medium conveying pipe has an inside diameter set to a value within both a first range of inside diameters and a second range of inside diameters on the basis of a capacity of the use-side heat exchanger connected to the heat-medium conveying pipe, the second range of inside diameters is different from the first range of inside diameters, the first range of inside diameters is a range of inside diameters being proper when the use-side heat exchanger connected to the heat-medium conveying pipe is in cooling operation, the second range of inside diameters is a range of inside diameters being proper when the use-side heat exchanger connected to the heat-medium conveying pipe is in heating operation.