Aquaculture Engineering

Pumps - Computation of Horse power requirement of the motor driving the pump

Unit 12 - Management of ponds

Pumps

Computation of Horse power requirement of the motor driving the pump
The actual horse power (HP) required to be supplied by the engine or electric motor for driving the pump is called brake horse power (B.H.P). This is computed by using the following expression.

The product of KW and the number of operational hours H of pump motors gives the energy consumption E by the pump motor in Kilowatt hours or unit.
E = Kw x H (Kilowatt – hours or unit).
For flat belt drive, drive efficiency varies from 80 to 90 percent for v–belt drive it varies form 90 to 95 percent and for right angle gear head drives it is about 95 percent.
Efficiencies of electric motors Em usually vary from 80 to 90% and that of diesel engines from 70 to 80 percent. Pump efficiencies Ep usually vary from 50 to 70 percentage. Large pumps are more efficient.