Pump efficiency is the ratio of effective power to shaft power. It marks the effective degree of energy conversion of the water pump, and is an important technical and economic index of the water pump, which is represented by η.
The efficiency on the pump nameplate corresponds to the efficiency when passing the design flow, which is the highest efficiency of the pump. The higher the efficiency of the pump, the smaller the energy loss when the pump is working.
The shaft power of the water pump cannot be completely transferred to the output liquid, and a part of the energy must be lost. The energy loss in the water pump can be divided into three parts, namely hydraulic loss, volume loss and mechanical loss.
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