Refers to the effective pump power and shaft power ratio. η = Pe / P Pump power usually refers to the input power, that is, the prime mover to the shaft power, it is also known as shaft power, with P said. Effective power is: pump head and mass flow and acceleration of the product of gravity. Pe: Ïg QH (W) or Pe = γQH / 1000 (KW) Ï: Density of the liquid pumped by the pump (kg / m3) γ: Gravimetric pumped liquid of the liquid γ = Ïg (N / s) Mass flow Qm = ÏQ (t / h or kg / s)
