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Please I need more description of the question because I am unable to understand the required
efficiency in engg. is described as output / input or useful energy / input energy. For pumps, the output is the work done on the liquid called WHP-water horsepower divided by the energy input to drive the pump which is the BHP-brake horsepower or the shaft power torque.
And for the motor the output is the shaft power or the torque of the shaft and when a pulley is attached the BHP, and the input is the EHP, electrical horsepower which is volts and the running amps measured by an ammeter.
The pump energy lost in the chiller( chiller staging) should be compensated by running a standy by chiller, such that the supply flow should be equal or greater than the return to the chiller at any time that is where the standby pump is started to allow more flow to meet the demand, excess flow from the supply is bypassed to the return to the chiller. there is no such thing as pump energy losses in a CHW system, but a staging of the chillers to balance the supply and demand flow.