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AIR-CONDITIONING APPARATUS

  • US 20120174611A1
  • Filed: 10/27/2009
  • Published: 07/12/2012
  • Est. Priority Date: 10/27/2009
  • Status: Active Grant
First Claim
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1. An air-conditioning apparatusin whicha compressor, a heat source side heat exchanger, expansion devices, and heat exchangers related to heat medium connect to form a refrigerant cycle circulating a heat source side refrigerant, andpumps, use side heat exchangers, and the heat exchangers related to heat medium connect to form a plurality of heat medium cycles circulating a heat medium,the air-conditioning apparatus, comprising:

  • a heat medium flow control device controlling a flow rate of the heat medium that circulates in the use side heat exchangers;

    a first temperature sensor, which is positioned at a point in a passage between each of the heat exchangers related to heat medium and an inlet side of the use side heat exchangers, detecting a temperature of the heat medium;

    a second temperature sensor, which is positioned at a point in a passage between each outlet side of the use side heat exchangers and the heat exchangers related to heat medium, detecting a temperature of the heat medium; and

    a controller that controls at least the heat medium flow control device, the pumps, the compressor, and the expansion devices,the controllerexecuting a heat-medium-flow-control-device control that controls an opening degree of the heat medium flow control device,executing a pump control that controls each operation capacity of the pumps such that the opening degree of the heat medium flow control device, which has the maximum opening degree, controlled by the heat-medium-flow-control-device control approaches a target opening degree, andexecuting a control of the refrigeration cycle of the refrigerant circuit such that a temperature of the heat medium, in which the flow rate is controlled by the heat-medium-flow-control-device control and the pump control, approaches a target temperature,the controller, in the refrigeration-cycle control, setting either or both of a condensing temperature and an evaporating temperature of the heat source side refrigerant, or either or both of amount of change of the condensing temperature and amount of change of the evaporating temperature of the heat source side refrigerant such that the detection temperature of the first temperature sensor approaches the target temperature of the heat medium.

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