How is the efficiency of a typical centrifugal pump determined?
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What considerations are there when selecting the efficiency of a pump when calculating the power of a centrifugal pump?
The efficiency of a centrifugal pump is not selected: lol. For a centrifugal pump of a certain model and speed under specific operating conditions (from the same manufacturer), its efficiency is relatively constant (although there are still some errors in actual measurements). The efficiency of the pump can generally be determined by referring to the performance curve. Unless it’s a newly developed model, then assess it first and make corrections after testing. :lol
You can estimate first or check sample data; I’m not sure if you work in design or in a factory?
Agree with what was said on the second floor. If the poster is the user, it would be best to obtain the test reports or performance curves provided by the manufacturer, and check the efficiency at the corresponding flow rates.
Generally, it is the shaft power divided by the motor power, which represents the pump efficiency