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Method and apparatus for improving efficiency of a pulsed expansion valve heat pump

  • US 5,077,983 A
  • Filed: 11/30/1990
  • Issued: 01/07/1992
  • Est. Priority Date: 11/30/1990
  • Status: Expired due to Fees
First Claim
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1. In a heat pump system for cooling a conditioned space having a pulsed solenoid expansion valve controlled by a discharge temperature based PI algorithm the method of improving efficiency of operation which comprises the steps of:

  • interrupting the discharge temperature sensor control of the pulsed expansion valves during start up;

    pulsing the expansion valve during start up at a predetermined constant duty cycle; and

    terminating the constant duty cycle and reestablishing discharge temperature sensor control thereof upon reaching a predetermined compressed refrigerant discharge temperature.

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