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Air-conditioning apparatus

  • US 10,018,389 B2
  • Filed: 12/22/2011
  • Issued: 07/10/2018
  • Est. Priority Date: 12/22/2011
  • Status: Active Grant
First Claim
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1. An air-conditioning apparatus comprising:

  • a refrigeration cycle configured by connecting a load-side heat exchanger, a load-side expansion device, a heat-source-side heat exchanger, a heat-source-side expansion device provided between the load-side expansion device and the heat-source-side heat exchanger, and a compressor and by causing refrigerant to circulate through a refrigerant circuit including the load-side heat exchanger, the load-side expansion device, the heat-source-side expansion device, the heat-source-side heat exchanger, and the compressor, the compressor is a compressor that is capable of injecting refrigerant;

    a controller configured to control an opening degree of the load-side expansion device and an operation capacity of the compressor;

    a bypass pipe that extends from a portion of a flow passage between the load-side expansion device and the heat-source-side expansion device to an injection port of the compressor; and

    a bypass expansion device that adjusts a flow rate of the bypass pipe, whereinthe refrigeration cycle is configured such that the refrigerantflows during a heating operation through the compressor, the load-side heat exchanger, and the load-side expansion device in this order,branches into a flow passage in which the refrigerant is decompressed by the heat-source-side expansion device, flows into the heat-source-side heat exchanger, and is sucked in the compressor, andbranches into the bypass pipe in which the refrigerant is decompressed by the bypass expansion device and injected to the compressor,the controller is configured to, during the heating operation,control the operation capacity of the compressor so that pressure of the refrigerant at an outlet of the compressor becomes equal to a target pressure,control an opening degree of the load-side expansion device so that a degree of subcooling of the refrigerant at an outlet of the load-side heat exchanger becomes equal to a target degree of subcooling in response to a case where an operation capacity of the compressor is approximately at a maximum value of the operation capacity of the compressor and a condensing temperature of the load-side heat exchanger is equal to or larger than a target temperature, andreduce an opening degree of the load-side expansion device, based on a discharge pressure of the compressor, so that the pressure of the refrigerant at the outlet of the compressor becomes equal to the target pressure in response to a case where the operation capacity of the compressor is approximately at the maximum value of the operation capacity of the compressor and the condensing temperature of the load-side heat exchanger is lower than the target temperature.

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