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Water 2018, 10(9), 1255; https://doi.org/10.3390/w10091255

Energy Efficient Operation of Variable Speed Submersible Pumps: Simulation of a Ground Water Well Field

1
Berliner Wasserbetriebe, Research and Development, 10864 Berlin, Germany
2
Department VIII - Mechanical Engineering, Process and Environmental Technology, Beuth University of Applied Sciences, 10864 Berlin, Germany
3
DVGW Research Centre at the Hamburg University of Technology, Am Schwarzenberg-Campus 3, 21073 Hamburg, Germany
*
Author to whom correspondence should be addressed.
Received: 19 July 2018 / Revised: 30 August 2018 / Accepted: 4 September 2018 / Published: 15 September 2018
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Abstract

Due to their lower energy consumption, permanent magnet synchronous motor (PMSM) submersible pumps have been introduced in ground water well field operation. Besides direct savings of energy, the introduction of PMSM pumps together with the required variable frequency converters offers new operational scenarios to meet the seasonally varying water demand. In this work, potential energy savings of variable speed submersible pumps were investigated. A ground water well field consisting of 13 wells and their transport pipes was modeled in the hydraulic modeling software EPANET 2.0. Using MS visual basic for applications, EPANET was coupled with MS Excel and a genetic algorithm to identify the most energy efficient combination of pump speeds. For the simulated well field, the total specific energy demand required for pumping was significantly lower in partial load operation as compared to nominal pump speed operation. For low and moderate flow scenarios, energy savings in the range of 20% compared to nominal speed operation can be achieved. These findings were confirmed by a monitoring campaign in the well field. Combining hydraulic simulation and optimization using genetic algorithms, the best efficiency scenario for operation of ground water well fields can be found. View Full-Text
Keywords: EPANET; ground water; well field; genetic algorithm; submersible pumps; variable speed; permanent magnet synchronous motors EPANET; ground water; well field; genetic algorithm; submersible pumps; variable speed; permanent magnet synchronous motors
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Sperlich, A.; Pfeiffer, D.; Burgschweiger, J.; Campbell, E.; Beck, M.; Gnirss, R.; Ernst, M. Energy Efficient Operation of Variable Speed Submersible Pumps: Simulation of a Ground Water Well Field. Water 2018, 10, 1255.

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