What is the efficiency of vertical circulating pump? What is the formula for calculating the pump efficiency?

Pump efficiency refers to the ratio of effective power and shaft power of the pump. η= pe/p

The pump power usually refers to the input power, that is, the power transmitted by the prime mover to the pump shaft, so it is also called the shaft power, expressed in p.

Effective power is the product of pump head, mass flow and gravity acceleration.

pe= ρ G qh (w) or pe= γ qh/1000 (kw) ρ： Density of liquid delivered by pump (kg/m3)

γ： Weight of liquid delivered by the pump γ=ρ G (n/m3) g: acceleration of gravity (m/s)

Mass flow qm= ρ Q (t/h or kg/s)

Because the power of circulating vertical pump N (KW)=head (m) × Flow (m3/s) × 1000 (water weight Kg/m3) ÷ 102 (power conversion coefficient) ÷ η (efficiency of water pump), from which the efficiency of water pump can be obtained. If the current and voltage can be measured (the pump power can be calculated), the pump efficiency can be obtained by measuring the flow and lift, which is the pump efficiency calculation formula.