Air-conditioning apparatus

摘要

In an air-conditioning apparatus, a heat source side heat exchanger, intermediate heat exchangers, and use side heat exchangers are separately formed and adapted to be disposed at separate locations, respectively. There is provided a defrosting operation function to melt frost attached around the heat source side heat exchanger, and a heating function during defrosting operation that drives a pump to circulate a heat medium and supply heating energy to the use side heat exchangers in need of heating to perform heating operation. The defrosting operation function can be executed by switching a four-way valve to cooling side to introduce a high-temperature high-pressure refrigerant flowed out of the compressor into the heat source side heat exchanger.

主权项

1. An air-conditioning apparatus, comprising:
an intermediate heat exchanger for heating a heat medium and an intermediate heat exchanger for cooling a heat medium, each intermediate heat exchanger exchanging heat between a refrigerant and the heat medium different from the refrigerant; a refrigerating cycle in which a compressor, a flow path switching valve that switches an outlet side flow path of the compressor between at a time of heating and at a time of cooling, a heat source side heat exchanger, at least one expansion valve, and at least one of refrigerant side flow paths of the intermediate heat exchanger for heating the heat medium and the intermediate heat exchanger for cooling the heat medium are connected via piping through which the refrigerant flows; a heat medium circulation circuit in which at least one of heat medium side flow paths of the intermediate heat exchanger for heating the heat medium and the intermediate heat exchanger for cooling the heat medium, a pump corresponding to the intermediate heat exchangers for heating the heat medium and a pump corresponding to the intermediate heat exchanger for cooling the heat medium, and a plurality of use side heat exchangers connectable to the respective intermediate heat exchangers are connected via piping through which the heat medium flows; and at least one controller that controls a defrosting operation, the defrosting operation introducing a high temperature and high pressure refrigerant discharged from the compressor into the heat source side heat exchanger by switching the flow path switching valve to a cooling side and melting frost surrounding the heat source side heat exchanger, wherein the heat source side heat exchanger, the intermediate heat exchanger for heating the heat medium and the intermediate heat exchanger for cooling the heat medium, and the use side heat exchangers are formed in a separate body and adapted to be installed at separate locations, and the at least one controller is configured to be capable of performing simultaneously
a cooling operation during the defrosting operation to circulate the heat medium between the use side heat exchanger in need of cooling and the intermediate heat exchanger for cooling the heat medium by driving the pump corresponding to the intermediate heat exchanger for cooling the heat medium, anda heating operation during the defrosting operation to circulate the heat medium having heating energy in the intermediate heat exchanger for heating the heat medium in heat medium circulation circuit including the intermediate heat exchanger for heating the heat medium between the use side heat exchanger in need of heating and the intermediate heat exchanger for heating the heat medium by driving the pump corresponding to the intermediate heat exchanger for heating the heat medium.