CALCOLO
DELLA POTENZA ELETTRICA IN FUNZIONE DELL'ENERGIA DEL VENTO DISPONIBILE
/ CALCULATE THE AMOUNT OF POWER AVAILABLE AT A GIVEN
WIND SPEED



How Can I Calculate
the Amount of Power Available at a Given Wind Speed?
Contributed By Eric Eggleston, 5 February 1998 Because air has mass and it moves to form wind, it has kinetic energy. You may remember from science class that:
where: Usually, we're more interested in power (which changes moment to moment) than energy. Since energy = power x time and density is a more convenient way to express the mass of flowing air, the kinetic energy equation can be converted into a flow equation: Power in the area swept by the wind turbine rotor:
where: This yields the power in a free flowing stream of wind. Of course, it is impossible to extract all the power from the wind because some flow must be maintained through the rotor (otherwise a brick wall would be a 100% efficient wind power extractor). So, we need to include some additional terms to get a practical equation for a wind turbine. Wind Turbine Power:
where: If there is any single equation that the beginning wind enthusiast should memorize, this is it. 


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