Реферат: Wind Power Essay Research Paper The wind

Darrieus-windmill are that it can deliver mechanical power at ground

level. The generator, gearbox, and turbine components are on the ground,

instead of at t he top of a tower as in horizontal-axis windmills. They

cost much less to construct, because there is less material, and the pitch

of the blades does not have to be adjusted. Another type of HSVAW’s are

the Madaras and Flettner types, revolving cylinder s which sit on a

tracked carriage. “The motion of a spinning cylinder causes the carriage

to move over a circular track and the carriage wheels to drive an electric

generator” (Justus). The Savonius model, which originated in Finland in

the 1920’s, is a n S-shaped blade, which rotates and turns a vertical

shaft. Today, these types of windmills are very popular with scientists

and their technology is being developed.

Windmills Today Many windmills are used today: some estimates say 150,000

(Cheremisinoff 31), in the Midwest. They are used to heat water,

refrigerate storage buildings or rooms, refrigerate produce, dry crops,

irrigate crops, heat buildings, and charge batteries for tr actors on

farms (33). Ever since the energy shortages of the 70’s, the growing

concern of pollution due to the burning of fossil fuels and the depletion

of natural resources, windmills have been greatly studied and developed.

Today, Sandia National Laboratories, Alcoa, GE, Boe ing, Grumman, UTC,

Westinghouse, and other scientists are researching and developing

Darrieuses and new types of windmills. Today, windmills are used to

operate sawmills and oil mills in Europe. They are used in mining to

extract minerals, to pump water , to generate electricity, and to charge

batteries. “Windmills have been used on buoys moored far out in the

ocean, the power being used for the collection and transmission of

oceanographic and weather data. They also work in deserted places as an

aid t o radio and telephone communications and they are used to work

navigation lights on isolated hazards” (Calvert 77).