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Monitor and control for a multi-pump system
| Details |
Inventors: Rishel, James B.;
Assignee: Systecon, Inc. (Cincinnati, OH)
Primary Examiner: Lall; Parshotam S.
Assistant Examiner: Mattson; Brian M.
Attorney, Agent or Firm: Wood, Herron & Evans
Wire-to-water efficiency (W) of a multi-pump system is monitored and accurately determined according to the formula: ##EQU1## wherein Q is flow through the system, HS is total dynamic head across the inlet and outlet headers of the system, E is energy input to the system to drive the pump, and K is a predetermined conversion factor. The resulting efficiency determination is provided to an operator so that the pump system may be monitored. |
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DETAILED DESCRIPTION The method and apparatus provided by the present invention are believed to overcome the above drawbacks.
In particular, with the method and apparatus of the present invention, only one set of pump head transducers need be employed.
Further, a fudge factor is not necessary yet wire-to-water efficiency may be more accurately determined in a multi-pump system than is believed to have been heretofore accomplished.
Moreover, with the method and apparatus of the present invention, selected pumps within a pumping system may be selectively energized and deenergized according to the accurately determined wire-to-water efficiency whereby to operate the pumping system more efficiently.
Thus, in accordance with the present invention and in its broadest aspect, an apparatus and method for monitoring a pumping system is provided in which the wire-to-water efficiency of the system is determined with regard to the total dynamic head HS (i.
e.
from inlet to outlet header) rather than with regard to a heretofore utilized pump head H.
Thus, in the present invention, only one head or differential pressure measurement is taken which includes any system losses due to fittings and valves and the like between the headers and does not rely upon error-inducing assumption in arriving at an accurate determination of wire-to-water efficiency.
The inclusion of system losses is important because Applicant has determined that such losses are not constant but may vary with the number of pumps energized even at a given flow or total dynamic head.
Thus, Applicant believes that failure to include such losses in the actual wire-to-water efficiency determination may have led to erroneous data from which to design and/or control pumping systems Also, because accurate wire-to-water efficiency determinations may now be made with one set of pump head transducers, the cost and complexity of multiple transducer monitoring is eliminated.
With particular reference to the present invention, wire-to-water efficiency may now be accurately determined by the formula: ##EQU3## wherein HS is the total dynamic head which is the differential pressure (DP) from inlet to outlet header minus any overpressure (OP) downstream of the outlet header (assumed=0 for variable pump systems), and K is a predetermined conversion factor so that W results in a percentage from 0-100%
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