The issue of calculating pump efficiency
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How is the efficiency of a pump calculated, and what are the implications of high or low efficiency?
The pump efficiency cannot be calculated; it is determined through actual experiments. The level of efficiency affects the shaft power of the pump; in other words, the better the pump’s efficiency, the less electricity it consumes
The efficiency value on that pump’s nameplate was calculated by him through hydraulic modeling
Yes, the efficiency indicated on the pump’s nameplate is determined by the manufacturer through hydraulic tests, and pumps of the same specification from different manufacturers can have varying efficiencies.
The efficiency of pumps is generally determined in a laboratory setting; it’s not possible to determine it on-site. It is calculated through a systematic process, and information on this can be found in textbooks on chemical engineering principles.