Air-conditioning apparatus

摘要

An air-conditioning apparatus has at least one intermediate heat exchanger that exchanges heat between a refrigerant changing in two phases or a refrigerant in a supercritical state and a heat medium such as water and anti-freezing fluid different from the refrigerant, a refrigeration cycle in which a compressor, a heat-source side heat exchanger, at least one expansion valve, and a refrigerant-side channel of the intermediate heat exchanger are connected via a pipeline through which the refrigerant flows, and a heat-medium circulation circuit in which a heat-medium side channel of the intermediate heat exchanger, a pump, and a use-side heat exchanger are connected via a pipeline through which the heat medium flows, in which in the heat-medium circulation circuit, a fourth temperature sensor that detects a temperature of the heat-medium flowing out of the use-side heat exchanger is provided, and leakage of the heat medium from the heat-medium circulation circuit is detected on the basis of a change amount of a detected temperature of the fourth temperature sensor.

主权项

1. An air-conditioning apparatus comprising:
at least one intermediate heat exchanger that exchanges heat between a refrigerant changing in two phases or a refrigerant in a supercritical state and a heat-medium such as water and anti-freezing fluid different from said refrigerant; 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 via a pipeline 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 plurality of use-side heat exchangers are connected via a pipeline through which said heat medium flows, opening/closing devices that open or close each channel of the heat-medium at an inflow side of each of said use-side heat exchangers; a first temperature sensor arranged to detect a temperature of the heat-medium that flows in the heat-medium circulation circuit or a second temperature sensor arranged to detect a temperature related to said pump; and a controller configured for detecting a leakage of the heat-medium from the heat-medium circulation circuit on the basis of a temperature of said heat-medium flowing through said heat-medium circulation circuit detected by the first temperature sensor or a temperature detected by the second temperature sensor by making said heat-medium flow into said use-side heat exchangers one by one by operating said opening/closing devices.