Modeling the Efficiency and Power Characteristics of a Pump Group
Publication: Journal of Water Resources Planning and Management
Volume 134, Issue 1
Abstract
This note proposes models for efficiency and mechanical input power of a group of parallel identical pumps which can be fixed or variable speed. Two approaches are considered. In the first approach, the power characteristic is evaluated from hydraulic and efficiency curves. In the second approach, the mechanical power is approximated directly by a cubic polynomial and scaled by pump speed and number of pumps. In both cases, the obtained power curves are well suited for use in simulation and optimization software; however, if the power data points are available, the second approach can lead to a more accurate representation. The effects of the electric motor efficiency characteristic on the performance of the entire pump plant are also discussed. The developed theory is illustrated by a practical case study. For completeness, the studies are performed using two types of fitted pump hydraulic curves, one quadratic and one described by a power law.
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Acknowledgments
This research was supported by EPSRC Grant No. EPSRC-GBGR/N26005.
References
Brdyś, M. A., and Ulanicki, B. (1994). Operational control of water systems: Structures, algorithms and applications, Prentice-Hall, New York.
Coulbeck, B., Orr, C. H., and Cunningham, A. E. (1991). “GINAS 5 reference manual.” Research Rep. No. 56, Water Software Systems, De Montfort Univ., Leicester, U.K.
Ormsbee, L. E., Walski, T. M., Chase, D. V., and Sharp, W. W. (1989). “Methodology for improving pump operation efficiency.” J. Water Resour. Plann. Manage., 115(2), 148–164.
Rossman, L. A. (2000). EPANET 2 users manual, U.S. Environmental Protection Agency, Cincinnati.
Sulzer Pumps Division. (2006). “Stage casting pump HPL.” ⟨http://www.sulzerpuumps.com/PortalData/9/Resources//brochures/water/ring/HPL-brochure.pdf⟩ (Aug. 3, 2006).
Walski, T. M., Barnard, T. E., Harold, E., Merritt, L. B., Walker, N., and Whitman, B. E. (2004). Wastewater collection system modeling and design, Haestad Press, Waterbury, Conn.
Yu, G., Powell, R. S., and Sterling, M. J. H. (1994). “Optimized pump scheduling in water distribution systems.” J. Optim. Theory Appl., 83(3), 463–488.
Zessler, U., and Shamir, U. (1989). “Optimal operation of water distribution systems.” J. Water Resour. Plann. Manage., 115(6), 735–752.
Information & Authors
Information
Published In
Journal of Water Resources Planning and Management
Volume 134 • Issue 1 • January 2008
Pages: 88 - 93
Copyright
© 2008 ASCE.
History
Received: Nov 14, 2005
Accepted: Jul 6, 2006
Published online: Jan 1, 2008
Published in print: Jan 2008
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