Relationship Between Power and Various Efficiencies

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Relationship Between Power and Various Efficiencies

Refer figure shows the input power to runner and output power, Po from generator,
Input and Output Power
Let H, Q =
Discharge, (m3/s)

             ρ = Density of water = 1000 kg/m3

Input Power Pi
= ρ.g.Q.H/1000 (kW)

Mechanical
Efficiency, ηm

ηm
= Shaft power available from runner, Ps/ Input power, Pi

Generator efficiency,

ηg
= Electrical power output, Po/ Input mechanical or shift
power, Ps

Overall
efficiency, ηo

ηo
= Electrical general output from generator, Po/Input power, Pi

∴ ηo = ηm x ηg

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