Windmill - Renewable Energy - Clean Electricity - Green Home - Solar Power

Solving for wind speed.

Scroll to the bottom to see typical input values for the variables.

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wind power (P)

= 0

= 0

watt

air density (ρ)

= 0

= 0

kilogram/meter^3

rotor swept area (A)

= 0

= 0

meter^2

coefficient of performance (Cp)

= 0

= 0

generator efficiency (Ng)

= 0

= 0

gear box bearing efficiency (Nb)

= 0

= 0

wind velocity (V)

= NOT CALCULATED

Select to solve for a different unknown

Symbol | Description | Typical values |

ρ | air density | 1.2 kg/m^{3} (sea level) |

Cp | performance coefficient | 0.35 is typical 0.56 is the theoretical maximum known as the Betz limit. |

Ng | generator efficiency | 50 percent to 80 percent. |

Nb | gearbox | 95 percent |

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