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Performance-based control system

  • US 5,855,791 A
  • Filed: 02/29/1996
  • Issued: 01/05/1999
  • Est. Priority Date: 02/29/1996
  • Status: Expired due to Term
First Claim
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1. A method for detecting and controlling cooling system characteristics, said method comprising the steps of:

  • measuring a flow rate of make-up cooling medium;

    measuring a conductivity of said make-up cooling medium;

    measuring a conductivity of a recirculating cooling medium;

    determining a treatment compound feed rate based upon the following formula;

    ##EQU6## where X is a treatment feed rate of a treatment compound, Ω

    is a desired concentration of the treatment compound, and K is a constant;

    measuring a corrosion rate of the recirculating cooling medium;

    determining a desired corrosion rate of the recirculating cooling medium;

    calculating a feed rate of a corrosion inhibitor according to the following formula;

    
    
    space="preserve" listing-type="equation">Y=(X) 1+α

    (CORR.sub.MEASURED /CORR.sub.SETPOINT)!, where Y is the feed rate of the corrosion inhibitor, X is as defined above, CORRMEASURED and CORRSETPOINT respectively represent a measured corrosion rate and a set value for corrosion rate, and α

    is a cascade factor that varies in a step-wise manner depending upon the value of CORRMEASAURED /CORRSETPOINT and has a value between about 0.0 and about 8.0; and

    feeding a corrosion inhibitor at said corrosion inhibitor feed rate.

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