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Wind Power By, Yang Essay

984 words - 4 pages

WINDPOWERFor human development to continue, we will ultimately need to find sources of renewable or virtually inexhaustible energy. It is difficult to imagine this but even if we find several hundred or thousand of years of oil, coal, and natural gas supplies, what will happen when they are depleted? Even the most apparently "inexhaustible" sources like fusion involved the generation of large amount of wasted heat (energy) -enough to place damaging stress on even a robust ecosystem like Earth'sWe are engaged in a sort of world wide biological experiment, with our descendents as the subjects.There is a lot of underlying popular support for wind energy and the other renewables in the U.S. but there is a lot of apathy as well. We are blissfully sedated by low conventional energy prices and are gulping down the few remaining years of cheap natural gas and crude oil. As we do this, the inertia of global warming are quickly building.THE HISTORY OF WIND POWERThe history of wind power shows a general evolution from the use of simple, light devices driven by aerodynamic drag forces; to heavy, materials-intensive drag devices.Aerodynamic lift (the forces that make airplane fly) is a modern concept that was not known to the ancients.The earliest known use of wind power is the sail boat, and this technology had an important impact on the later development of sail type windmills.The first windmills were developed to automate the tasks of grain-grinding and water-pumping. The earliest known design is the vertical axis system developed in Persia around 500-900 A.D.Vertical Axis windmills were also used in china, which is often claimed as the birthplace of windmill about 2000 years ago.THE FIRST USED OF WIND TO GENERATE ECLECTICITY.The first used of a large wind mill to generate electricity was a system built in Cleveland, Ohio, in 1888 by Charles F. Brush. The Brush windmill generated 12 kilowatts.By the ending of WWW I, the used of 25Kilowatts windmill had spread throughout Demark, but cheaper and larger fossil-fuel plants soon put these mills out of business.The first small electrical output wind turbines simply used modified propellers to drive direct current generators. By the1920, 1-3 kilowatts wind generators developed by companies like Parris-Dunn and Jacobs Wind-Electric found widespread use in the rural areas of the American Midwestern Great plains. But there use extended to an entire array of direct-current motor-driven appliances, including refrigerators, freezers, washing machines, and power tools. The more appliances were powered by the early wing generators, the more problems it has. There's not enough of electrical power to supply multiple appliances.The growing demand for electrical power created by the wind generators, combine with the inability of the technology to adapt, help make the situation inevitable. The early success of the Midwest wind turbines actually set the stage for the possibility of more extensive wind energy development in the...

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