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Method and apparatus for fan control to achieve enhanced cooling

  • US 5,102,040 A
  • Filed: 03/28/1991
  • Issued: 04/07/1992
  • Est. Priority Date: 03/28/1991
  • Status: Expired due to Term
First Claim
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1. A method for controlling the speed of at least one fan which forces air through an enclosure to enhance the cooling of equipment within the enclosure, comprising the steps of:

  • (a) prescribing a relationship between the maximum allowable difference (Δ

    Tm) between the temperature of air entering the enclosure (Ti) and the temperature of air exhausted from the enclosure (Te) for a given value of Ti ;

    (b) monitoring both Ti and Te ;

    (c) determining the difference between the actual value of Δ

    T and the maximum allowable value of Δ

    Tm corresponding to the actual value of Ti ; and

    (d) increasing the speed of the fan when the actual value of Δ

    T exceeds the maximum allowable value of Δ

    Tm by more than a predetermined tolerance factor.

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