How wind energy change when air density reduced to half and wind velocity increase to double?
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REPORTS & MULTIMEDIA
REPORTS & MULTIMEDIA / EXPLAINER
How Wind Energy Works
Published Jul 14, 2008 Updated Oct 21, 2013
Harnessing the wind is one of the cleanest, most sustainable ways to generate electricity. Wind power produces no toxic emissions and none of the heat-trapping emissions that contribute to global warming. This, and the fact that wind power is one of the most abundant and increasingly cost-competitive energy resources, makes it a viable alternative to the fossil fuels that harm our health and threaten the environment.
Wind energy is the fastest growing source of electricity in the world. In 2012, nearly 45,000 megawatts (MW) of new capacity were installed worldwide. This stands as a 10 percent increase in annual additions compared with 2011 [1].
The United States installed a record 13,351 MW of wind power in 2012, capable of producing enough electricity to power more than 3 million typical homes [2]. While wind energy accounted for just under four percent of USelectricity generation in 2012, it already generates more than 10 percent of the electricity in nine USstates [3]. Thanks to its many benefits and significantly reduced costs, wind power is poised to play a major role as we move toward a sustainable energy future.
The history of wind power
Wind power is both old and new. From the sailing ships of the ancient Greeks, to the grain mills of pre-industrial Holland, to the latest high-tech wind turbines rising over the Minnesota prairie, humans have used the power of the wind for millennia.
In the United States, the original heyday of wind was between 1870 and 1930, when thousands of farmers across the country used wind to pump water. Small electric wind turbines were used in rural areas as far back as the 1920s, and prototypes of larger machines were built in the 1940s. When the New Deal brought grid-connected electricity to the countryside, however, windmills lost out.
Interest in wind power was reborn during the energy crises of the 1970s. Research by the USDepartment of Energy (DOE