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Variable speed drive chiller system

  • US 6,434,960 B1
  • Filed: 07/02/2001
  • Issued: 08/20/2002
  • Est. Priority Date: 07/02/2001
  • Status: Expired
First Claim
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1. A refrigeration system having:

  • a closed fluid circuit serially including a screw compressor, a discharge line, a condenser, an expansion device, a chiller and a suction line leading back to said compressor;

    water passing through said chiller in a heat exchange relationship and being cooled;

    said compressor being unloaded solely by regulating the speed of said compressor;

    motor means for driving said compressor;

    means for varying the speed of said motor means by controlling the frequency of electrical current supplied to said motor;

    means for providing cooling to said means for varying the speed;

    means for sensing the temperature of water leaving said chiller;

    means for controlling said means for varying the speed responsive to the sensed temperature of water leaving said chiller.

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