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You are at Renewable Energy Now .com/ Wind .html This website is a very large educational learning process directory of internet locations relating to Renewable Energy. Click on any of the pages below to learn more about how the United Sates of America and solve its imported energy problems by using renewable energy of wind, solar and bio-fuels.
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There is much debate
about how to define and distinguish renewable energy from non-renewable,
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A definition of wind: WHAT
CAUSES WIND?
It was the ancient Greek philosopher,
Anaximander, who first suggested that there was a scientific
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BASIC WIND ENERGY TECHNOLOGY The amount of wind you have at a wind energy site
determines how much power you can expect from Air density varies with temperature and elevation. Wam air is less dense than cold air. Any given wind turbine will produce less in the heat of
summer than it will in the dead of winder There is less power in the wind for a specific wind speed at a site in Idaho han near sea level. Changes in air density relative to standard conditions
at sea level can cust power production Power in the wind varies with the cube of the wind
speed. Double the speed of the wind and A 20 % increase in wind speed can give you a 70% increase in available power. Small changes in wind speed can have a profound effect
on the power of the wind. Power is also directly related to the area intercepting
the wind, that is the area swept by the wind. The relationship between the rotor's radius (or
diameter) and energy capture is The exponential relationship between swept area and the
power available also explains a crucial wind Streamers attached to a kite will fly smoother the
higher they get. Where these streamers fly smoothly Wind turbines can be small as a 1.7ft diameter 20-watt
Marlec 500 to Vestra's 200 ft diameter There are more than fifty manufacturers of small wind
turbines worldwide producing over Wind speed typically increases with height as there are
less obstructions to disrupt the Small Wind turbine sizes measured by the size of
rotor which range from the Micro turbines When charging batteries, the load they can receive may
be less than what is available. Rotor diameter usually refers to the rotor's swept
area. It is on of the critical factors in The more aerodynamically sophisticated rotors can
capture, at most, 40 percent of the There are not government agencies ensuring the accuracy
of published power curves, Permanent-magnet alternators produces voltage as soon
as they begin turning. When a wind turbine is providing energy only for a
local use then it is called "off grid". Wind turbines with 3 blades run smoother than turbines with just 2 blades. That means they will usually last longer. Aluminum is never used for turbines blades because of it's propensity for metal fatigue. Nearly all small wind turbines use tail vanes to point the motor into the wind. Heavier small wind turbines are more rugged and dependable than lightweight machines. A wind turbine furl is the ability to fold about a
hinges so that the rotor wings toward the Most small turbines use permanent-magnet alternators.
The case to which the magnets are On a percentage basis, wind energy has been the world's
fastest-growing energy source |
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NWTC TO FOCUS ON LOW-WIND-SPEED TURBINE __________________________________________ By John Dunlop, AWEA Great Plains Representative The National Renewable Energy Laboratory (NREL), in Golden, Colo., announced November 5 that it has restructured its wind energy applied research activities to focus on a major project, the Low Wind Speed Turbine (LWST) development program. The program's goal is to develop a turbine that can produce electricity as cheaply in a Class 4 wind regime (5.8 m/s, or nearly 13 mph, at a 10-meter height) as conventional turbines do in Class 6 regimes (average wind speeds of 6.7 m/s, or nearly 15 mph, at a 10-meter height). Utilizing the wind cost-competitively in Class 4 areas dramatically expands wind power potential available in the nation and increases the opportunities for wind power development in wind resource area much closer to load centers. A cost-competitive low-wind-speed turbine presents many challenges relative to conventional turbine design. As the energy density is less in slower winds, the rotor diameter of a LWST will be larger with the same size generator. The turbine will need to be on taller towers to accommodate the larger rotor and to capture more energetic winds at higher altitudes. The larger turbine blades will encounter more dramatic differences in power density between the top of the rotation and the bottom, introducing more severe stresses. Tower design is highly dependent upon the load being supported, placing a premium on weight reduction in the top-of-tower equipment--rotor, shaft, gearbox, and generator. __________________________________________ GE WIND TO SUPPLY TURBINES TO MINNESOTA __________________________________________ GE said November 22 that its wind energy unit, GE Wind Energy, will supply 34 1.5-MW wind turbines for a 50-MW project in southwestern Minnesota currently being developed by PacifiCorp Power Marketing, Inc. (PPM), a U.S. subsidiary of Scottish Power. The project was one of several wind power projects short listed by Xcel Energy in its 1,000-MW all-source solicitation (see Wind Energy Weekly #1019). In all, Xcel Energy selected 650 MW of wind power bids for its short list out of over 3,700 MW of wind power capacity bid. The wind plant, named the Moraine Wind Power Project, is expected to enter commercial operation in the fall of 2003. Located near Chandler, Minn., the project will supply wind power to Xcel Energy through a long-term power purchase agreement. Once completed, the project is expected to provide enough power to supply the annual electricity needs of more than 19,000 average American homes. For more information, contact Dennis Murphy of GE Power Systems, phone (770) 859-6948, e-mail dennis.murphy@ps.ge.com . __________________________________________ EUROPE'S WIND INDUSTRY REACHES 40% GROWTH RATE __________________________________________ Europe's installed wind power capacity has now reached 20,447 MW, a 40% increase in installed capacity over the last 12 months, according to a new industry survey published by the European Wind Energy Association (EWEA). Europe now is home to nearly three-quarters of the world's total wind power capacity. "This European success story for wind energy is just the beginning," said EWEA chief executive Corin Millais. "Within eight years, the total amount of wind energy installed globally can be more than 10 times that achieved in Europe today, if the appropriate policies are put in place. The cumulative global industry sector could be worth over Euro 130 billion ($130 billion) by 2010." Germany is leading the European expansion, commissioning 1,896 MW of wind energy in the first nine months of 2002, with Spain in second place with 742 MW. France moved into 10th place in the league table, with 131 MW installed. Austria celebrated its 100-MW landmark, and the Netherlands is also making progress. "With 50% of European wind capacity, the wind power boom in Germany is set to continue," said Millais. "The German government announced at the latest climate talks in India last month that it wants a 40% cut in greenhouse gases in Germany, and a 30% cut throughout Europe by 2020. Wind energy has proven itself to be one of the most powerful technology solutions for tackling climate change." A total of 84% of European wind energy capacity is installed in Germany, Spain, and Denmark. Wind energy now accounts for about 4% of national electricity consumption in Germany, and about 18% in Denmark. European companies manufacture about 80% of all wind turbines sold worldwide. At the Earth Summit in September, and the United Nations climate negotiations in India last month, EWEA launched its industry strategy, Wind Force 12--A Blueprint to Achieve 12% of the World's Electricity From Wind Power by 2020. The feasibility study finds that there are no technical, economic, or resource limitations to achieve the goal, but that political and policy changes are required in order for the industry to reach its full potential. By 2020, the industry is capable of installing 1,260,000 MW of wind energy throughout the world. Wind Force 12 says that by 2010, the industry is capable of installing 230,000 MW of wind energy worldwide, 100,000 MW in Europe. |
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