Chapter 6, Problem 6.23P

Interpretation Introduction

Interpretation: The monthly power required by the pump is to be determined by using the energy balance equation.

Concept introduction: The energy balance equation gives the equation for the amount of power delivered by the pump for a given fluid.

The power delivered by the pump for a given efficiency is,

  $\text{<msup> <mo>P</mo> <mo>′</mo></msup>}\text{=}\frac{\text{PQ}}{{\text{η}}_{\text{m}}{\text{η}}_{\text{p}}}$  ..... (1)

Q = Flow rate of the water

  $\text{<msup> <mo>P</mo> <mo>′</mo></msup>}$ = Power of the pump

P = Pressure delivered by the water

  ${\text{η}}_{\text{m}}$ = Motor efficiency

  ${\text{η}}_{\text{p}}$ = Pump efficiency