Proof of Betz’ Theorem Let us make the reasonable assumption that the average wind speed through the rotor area is the average of the undisturbed wind speed before the wind turbine, v1 , and the wind speed after the passage through the rotor plane, v2 , i.e. (v1 +v2 )/2. (Betz offers a proof of…

Energy Physicists define the word energy as the amount of work a physical system is capable of performing. Energy, according to the definition of physicists, can neither be created nor consumed or destroyed. Energy, however may be converted or transferred to different forms: The kinetic energy of moving air molecules may be converted to rotational…