Wind Turbines Efficiency & Comparison Calculator
Pwt = [1/2 . ρ . S . Vwind3 . Cp . CG . Cg] J.s-1
TSR = ωRrotor / Vwind, &omega = (RPM . 2π / 60) rad.s-1, Rrotor = (Drotor / 2) m
Power Pwt J.s-1 Wh  kWh/year
density of the air ρ kg.m-3
swept capture area of the wind S m2
Drotor=m LB=m
wind speed Vwind m.s-1 km/h = mph
wind turbine efficiency Cp %
Cp Betz = %
Cp Darrieus = %
Cp 3-blade = %
Cp American = %
Cp Savonius = %
generator efficiency CG %
gearbox/bearings efficiency Cg %
Tip Speed Ratio (TSR) λ RPM  Cp Betz = %
Wind Energy
W
Betz Limit
W
Ideal Propeller
W
Propeller under Test
W
Darrieus
W
American Multiblade
W
Savonius
W
Efficient Three-blade
W
wind turbines efficiency
Ishaft = [NB.ρB.LB.WB.tB.Rrotor2 + (1/12)(NB.ρB.LB.WB.tB(WB2+tB2))] kg.m-2
number of blades NB
density of blade material ρB kg.m-3
length of blade LB m
width of blade WB m
thickness of blades tB m
rotor radius Rrotor m
moment of inertia of the rotor about the rotating shaft Ishaft kg.m-2
inferred Cp ηwt %
inferred Pwt Pwt W
Darrieus Wind Turbine Efficiency chart: Cp = ηdarrieus(TSR)
Darrieus wind turbines efficiency
Savonius Wind Turbine Efficiency chart: Cp = ηsavonius(TSR)
Savonius wind turbines efficiency
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