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Wind Energy

The sun heats up the air which will rise into the sky. There, it causes differences in the air pressure. Through emerging winds, these differences are compensated.

The traditional way of using wind energy is based on the principle of resistance. Because of a better efficiency, the principle of buoyancy is used for wind generators. Similar to an airplane, the wind which is crossing the wings (rotor blades) generates buoyancy, which causes the wind turbine to rotate. This rotation is used for a generator to produce electricity. The efficiency for current windmills is already around 50% and could go up to 60%.

For constructional and visual reasons, most windmills have three wings with a length of 50 m each. In order to use larger wind velocities, windmills have a total height of about 170 m. The area crossed by the wing has about 10 000 m².

Depending on the average wind velocities of a certain location, a windmill can have up to 5 MW. This way it is able to serve 5000 civil homes with energy. It is expected, that the power and the efficiency will even rise to higher levels.

There are two kinds of windmill locations. If the windmill is located on a platform on the sea, it is called “offshore”. The use of a wind turbine in the country is called “onshore”. The highest average wind velocities are found on the sea. Therefore the extra costs for offshore wind engines is refunded by a larger production of electricity.

The picture shows the average wind velocities in 80 m height. Further basic information can be found on Wikipedia.