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Method and apparatus for cooling

  • US 9,568,206 B2
  • Filed: 08/21/2009
  • Issued: 02/14/2017
  • Est. Priority Date: 08/15/2006
  • Status: Active Grant
First Claim
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1. A method of improving efficiency of a cooling unit associated with a data center at a partial cooling load, comprising:

  • detecting a degree of opening of an electronic expansion hot gas bypass valve configured to divert a portion of coolant from a compressor to a heat exchanger of the cooling unit based on the partial cooling load of the data center, the electronic expansion hot gas bypass valve being a step valve having a plurality of steps each correlating to a degree of opening; and

    adjusting a discharge pressure set point based on the detected degree of opening of the electronic expansion hot gas bypass valve to prevent cycling of the compressor.

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