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System and method for calculating parameters for a refrigeration system with a variable speed compressor

  • US 9,494,354 B2
  • Filed: 03/18/2013
  • Issued: 11/15/2016
  • Est. Priority Date: 10/08/2007
  • Status: Active Grant
First Claim
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1. A system comprising:

  • a compressor connected to a condenser and an evaporator;

    an evaporator sensor that outputs an evaporator signal corresponding to an evaporator temperature;

    an inverter drive that modulates electric power delivered to said compressor to modulate a speed of said compressor; and

    a control module that is connected to said inverter drive, that receives said evaporator signal, that monitors compressor current and compressor speed from said inverter drive, and that calculates a condenser temperature based on said evaporator temperature, said compressor current, and said compressor speed using mapping data that directly correlates compressor speeds, evaporator temperatures, and compressor currents to condenser temperatures.

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