### Pump Power Calculation Formula | Specific speed of a ...

In this equation • the pump efficiency depends on the pump flow rate Q pump (which is equal to the demanded flow rate) and in the case of variable speed operation on the rotational speed n (see Sections 4.2 and 5.2 Section 4.2 Section 5.2). in the case of a grid-fed motor the drive efficiency η drive is equal to the motor efficiency η motor and depends on the mechanical power P mech (see ...

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