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Adjustable Speed Drives as Applied to Centrifugal Pumps
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Centrifugal pumps are generally sized to operate at or near the best efficiency point at maximum flow. The maximum flow requirements, however, frequently occur for a very short period during the operating cycle with the result that some method of flow control is required. The traditional approach to flow control has used valves which increase system pressure and inherently waste energy and generally cause the pump to operate at reduced efficiencies. Adjustable speed drives can achieve reduced flow by providing adjustable speed pump operation. This results in reduced system pressure and operation near the pump's Best Efficiency Point (BEP). In addition, maintenance costs might be reduced. This paper will discuss the energy savings potential of adjustable speed A-C drives followed by a brief description of the operation and relative benefits of different types of solid-state A-C drive types.
Jarc, D. A.; Robechek, J. D.; Connors, D. P. (1982). Adjustable Speed Drives as Applied to Centrifugal Pumps. Energy Systems Laboratory (http://esl.tamu.edu); Texas A&M University (http://www.tamu.edu). Available electronically from