Water is pumped from a lake to a storage tank 18 m above at

Water is pumped from a lake to a storage tank 18 m above at a rate of 70 L/s while consuming 20.4 kW of electric power. The storage tank is open to the atmosphere. 1 he head loss in the piping system is 3.2 m. The diameter of the pipe is 5 cm on the intake side and 7 cm on the discharge side. The kinetic energy correction factor (alpha) is 1.1 everywhere. Assume the elevation difference between the pump inlet and the outlet to be negligible. Determine the overall efficiency of the pump-motor. Determine the pressure difference between the inlet and exit of the pump. Determine the pressure difference between the inlet and exit of the pump.

Solution

The overall efficiency for this pump is 67% .

While the pressure difference between the inlet and outlet of pump is 45N/m2