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Apparatus and method for intelligent control of the fan speed of air-cooled condensers

  • US 6,594,554 B1
  • Filed: 07/11/2000
  • Issued: 07/15/2003
  • Est. Priority Date: 07/28/1999
  • Status: Expired due to Fees
First Claim
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1. A method for operating a fan which produces an air flow across a condenser of a refrigeration system, said method comprising:

  • sensing a temperature of the condenser to produce a temperature measurement;

    operating the fan in a first state of operation in which speed of the fan is varied in response to a comparison of the temperature measurement to a temperature set point;

    operating the fan in a second state of operation in which the fan is pulsed on and off thereby defining a duty cycle of operation;

    making a transition from the first state to the second state upon the occurrence of a first transition condition; and

    making a transition from the second state to the first state upon the occurrence of a second transition condition, wherein the first transition condition occurs at least in part based on a comparison of the speed of the fan to a predefined speed level and the second transition condition occurs at least in part based on a comparison of the duty cycle of the fan to a given value.

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