1、高考资源网（） 您身边的高考专家Wind Energy - Energy from Moving AirWind is simple air in motion. It is caused by the uneven heating of the earth surface by the sun. Since the earth surface is made of very different types of land and water, it absorbs the sun heat at different rates. During the day, the air above t
2、he land heats up more quickly than the air over water. The warm air over the land expands and rises, and the heavier, cooler air rushes in to take its place, creating winds. At night, the winds are reversed because the air cools more rapidly over land than over water. In the same way, the large atmo
3、spheric winds that circle the earth are created because the land near the earths equator is heated more by the sun than the land near the North and South Poles. Today, wind energy is mainly used to generate electricity. Wind is called a renewable energy source because the wind will blow as long as t
4、he sun shines.The History of WindSince ancient times, people have harnessed the winds energy. Over 5,000 years ago, the ancient Egyptians used wind to sail ships on the Nile River. Later, people built windmills to grind wheat and other grains. The earliest known windmills were in Persia (Iran). Thes
5、e early windmills looked like large paddle wheels. Centuries later, the people of Holland improved the basic design of the windmill. They gave it propeller-type blades, still made with sails. Holland is famous for its windmills. American colonists used windmills to grind wheat and corn, to pump wate
6、r, and to cut wood at sawmills. As late as the 1920s, Americans used small windmills to generate electricity in rural areas without electric service. When power lines began to transport electricity to rural areas in the 1930s, local windmills were used less and less, though they can still be seen on
7、 some Western ranches. The oil shortages of the 1970s changed the energy picture for the country and the world. It created an interest in alternative energy sources, paving the way for the re-entry of the windmill to generate electricity. In the early 1980s wind energy really took off in California,
8、 partly because of state policies that encouraged renewable energy sources. Support for wind development has since spread to other states, but California still produces more than twice as much wind energy as any other state. The first offshore wind park in the United States is planned for an area of
9、f the coast of Cape Cod, Massachusetts (read an article about the Cape Cod Wind Project). How Wind Machines WorkLike old fashioned windmills, today wind machines use blades to collect the wind kinetic energy. Windmills work because they slow down the speed of the wind. The wind flows over the airfoi
10、l shaped blades causing lift, like the effect on airplane wings, causing them to turn. The blades are connected to a drive shaft that turns an electric generator to produce electricity. With the new wind machines, there is still the problem of what to do when the wind is blowing. At those times, oth
11、er types of power plants must be used to make electricity.Wind Power PlanWind power plants, or wind farms as they are sometimes called, are clusters of wind machines used to produce electricity. A wind farm usually has dozens of wind machines scattered over a large area. The Big Spring Wind Power Pr
12、oject in Texas has 46 wind turbines that generate enough electricity to power 7,300 homes. Unlike power plants, many wind plants are not owned by public utility companies. Instead they are owned and operated by business people who sell the electricity produced on the wind farm to electric utilities.
13、 These private companies are known as Independent Power Producers. Operating a wind power plant is not as simple as just building a windmill in a windy place. Wind plant owners must carefully plan where to locate their machines. One important thing to consider is how fast and how much the wind blows
14、. As a rule, wind speed increases with altitude and over open areas with no windbreaks. Good sites for wind plants are the tops of smooth, rounded hills, open plains or shorelines, and mountain gaps that produce wind funneling. Wind speed varies throughout the country. It also varies from season to
15、season. In Tehachapi, California, the wind blows more from April through October than it does in the winter. This is because of the extreme heating of the Mojave Desert during the summer months. The hot air over the desert rises, and the cooler, denser air above the Pacific Ocean rushes through the
16、Tehachapi mountain pass to take its place. In a state like Montana, on the other hand, the wind blows more during the winter. Fortunately, these seasonal variations are a good match for the electricity demands of the regions. In California, people use more electricity during the summer for air condi
17、tioners. In Montana, people use more electricity during the winter months for heating. Wind ProductionAll together, wind machines in the United States generate 17 billion kWh per year of electricity, enough to serve 1.6 million households. This is enough electricity to power a city the size of Chica
18、go, but it is only a small fraction of the nations total electricity production, about 0.4 percent. The amount of electricity generated from wind has been growing fast in recent years, tripling since 1998.New technologies have decreased the cost of producing electricity from wind, and growth in wind
19、 power has been encouraged by tax breaks for renewable energy and green pricing programs. Many utilities around the country offer green pricing options that allow customers the choice to pay more for electricity that comes from renewable sources. Wind machines generate electricity in 30 different st
20、ates. The states with the most wind production are California, Texas, Minnesota, Iowa, and Wyoming. The United States ranks third in the world in wind power capacity, behind Germany and Spain. Most of the wind power plants in the world are located in Europe and in the United States where government
21、programs have helped support wind power development. Wind and the EnvironmentIn the 1970s, oil shortages pushed the development of alternative energy sources. In the 1990s, the push came from a renewed concern for the environment in response to scientific studies indicating potential changes to the
22、global climate if the use of fossil fuels continues to increase. Wind energy offers a viable, economical alternative to conventional power plants in many areas of the country. Wind is a clean fuel; wind farms produce no air or water pollution because no fuel is burned. The most serious environmental drawbacks to wind machines may be their negative effect on wild bird populations and the visual impact on the landscape. To some, the glistening blades of windmills on the horizon are an eyesore; to others, they are a beautiful alternative to conventional power plants. 高考资源网版权所有，侵权必究！
