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Pump control system

  • US 6,939,109 B2
  • Filed: 07/18/2002
  • Issued: 09/06/2005
  • Est. Priority Date: 09/28/2001
  • Status: Expired due to Fees
First Claim
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1. A pump control system for pressurized water supply systems comprising:

  • primary supply pumps that supply chilled water or hot water from a return header to a primary supply header via refrigerators, heat pump chillers, or boilers;

    secondary supply pumps that are provided with inverters and supply chilled water or hot water from said primary supply header to a secondary supply header;

    a flow sensor that measures the flow from said secondary supply header to said return header;

    a pressure difference sensor that measures the pressure difference between said secondary supply header and said return header; and

    a controller of the secondary supply pumps that determines a supply pressure from the secondary supply pumps using a flow rate measured with said flow sensor, carries out prescribed calculations based on this supply pressure and a discharge pressure measured with said pressure difference sensor, and outputs a control signal corresponding to the calculated result to said inverters.

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