Air-conditioning apparatus
AssigneeMitsubishi Electric Corporation
InventorsKeisuke Takayama, Koji Azuma, Yuji Motomura, Takeshi Hatomura
Life of this patent
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Abstract
An air-conditioning apparatus is capable of completing heat medium freeze prevention control more quickly by performing heat medium temperature rise control for raising the temperature of a cooled heat medium and includes a controller that adjusts a current opening degree of a bypass device at a bypass pipe to an opening degree, and that makes an adjustment such that the flow passage resistance in the case of the opening degree becomes equal to the flow passage resistance in the case of an opening degree before an expansion device is adjusted to a minimum opening degree.
Claims18
An air-conditioning apparatus comprising:
- a refrigeration cycle configured by connecting, by a refrigerant pipe, a compressor which compresses a heat-source-side refrigerant, a first intermediate heat exchanger which performs heat exchange between the heat-source-side refrigerant and a heat medium to cool the heat medium, an expansion device which decompresses the heat-source-side refrigerant, and a heat-source-side heat exchanger which performs heat exchange between outside air and the heat-source-side refrigerant, the refrigeration cycle including a bypass pipe for allowing part of or the entire heat-source-side refrigerant that is to flow in the first intermediate heat exchanger to perform bypassing, and a bypass device which is provided at the bypass pipe and which adjusts a flow rate of the heat-source-side refrigerant that performs bypassing;
- a heat medium circuit configured by connecting, by a heat medium pipe, a first pump which pressure-feeds the heat medium which has been cooled by the first intermediate heat exchanger, a use-side heat exchanger which performs heat exchange between the heat medium and air in an air-conditioned space, and the first intermediate heat exchanger;
- a refrigerant temperature detection device configured to detect a temperature of the heat-source-side refrigerant flowing into the first intermediate heat exchanger;
- first temperature detection device configured to detect a temperature of the heat medium circulating in the first intermediate heat exchanger;
- and
- a controller configured to adjust opening degrees of the expansion device and the bypass device,
- wherein, responsive to a case where the controller determines that the temperature of the heat-source-side refrigerant detected by the refrigerant temperature detection device has become lower than a predetermined refrigerant temperature:
- the bypass device is adjusted to open the opening degree thereof by the controller and the expansion device is also adjusted to close the opening degree thereof by the controller, and
- the first pump pressure-feeds the heat medium so that the use-side heat exchanger exchanges heat between the heat medium and the air in the air-conditioned space.
Dependencies are inferred from the claim text.