Efficiency

Efficiency refers to the ratio of useful power to driving power, meanwhile, it has various implications. Efficiency can be classified in many kinds, such as mechanical efficiency and thermal efficiency and etc.

Efficiency of the pump means the ratio of effective power to shaft power.

η=Pe/P

Power of the pump usually refers to the input power, which means the power of the primitive driving motor to the shaft of the pump. It is also called shaft power, expressed as P.

Effective power means the product of the head, flow rate and gravity acceleration.

Pe=ρg QH (W) or Pe=γQH/1000 (KW)

ρ：The density of the liquid（kg/m3）

γ：The weight of the liquid γ=ρg (N/m3）

g：Acceleration of gravity (m/s)

Capacity Qm=ρQ(t/h or kg/s)

Pump power N(KW)= lift (m) x flow rate (m3/s) x 1000(heavy weight of water Kg/m3) 102(power conversion coefficient)