Difference between revisions of "WindEnergy"
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The WePower Falcon is sized as small as 600 W with a 1.6-m diameter and a height of 1 m. <ref>http://wepowereco.com/ecolutions/renewable-energy/wind/</ref> | The WePower Falcon is sized as small as 600 W with a 1.6-m diameter and a height of 1 m. <ref>http://wepowereco.com/ecolutions/renewable-energy/wind/</ref> | ||
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[[www.awea.org American Wind Energy Association]] | [[www.awea.org American Wind Energy Association]] | ||
Revision as of 13:51, 27 August 2015
Wind Energy
Vertical Axis Wind Turbines
There isn't the space on a boat necessary for a horizontal-axis wind turbine (HAWTHorizontal-axis wind turbine) for supplementary power. Even a small vertical-axis wind turbine (VAWTVertical-axis wind turbine) is problematical. Think an egg beater, with the gearbox and generator located at the bottom of the mast. VAWTs are omnidirectional and can take advantage of turbulent and gusty winds because they require a lower wind speed to self-start. They rotate at 1/3 to 1/4 the speed of HAWTs, which reduces their noise and vibration levels.
Early designs (Savonius, Darrieus and giromill) had significant torque variation on the blades during each revolution, which tended to break the blades. Later designs based on the Darrieus model solved these issues with a helical twist of 60 or 120 degrees in the blades; and by using composite materials for the blades.
[1][2][3]Efficiency
Wind turbines are not very efficient. That'sSecond why you always see such large horizontal machines in the countryside (plus of course their utility scale). The best ones have an efficiency of around 35-47%percent in an ideal wind. According to Betz's law, no turbine can capture more than 16/27 (59.3%) of the kinetic energy in wind. Practical utility-scale wind turbines achieve at peak 75% to 80% of the Betz limit. [4]
Vertical turbines are less efficient than horizontal ones, around 30%. In a design with a diameter of 2-3 mMetre, SI unit of length (6-9 ftFoot) you can expect a maximum output of around 2.5 kWKiloWatt, 1000 watts (3.35 hphorsepower). Small (or “residential”) vertical systems may be suitable for boats. They range from 400 watts to 500 kilowatts.
Cost
Small vertical turbines cost in the range of USD $5,000 to 10,000.
Size
The problem of size remains. For example, the Windspire is a small 1.2-kilowatt (kW) vertical-axis wind turbine. The turbine tower is 9.1 meters tall, and its rotor area is 1.2 by 6.1 meters. [5]
The WePower Falcon is sized as small as 600 WWatt with a 1.6-m diameter and a height of 1 m. [6]Links
www.awea.org American Wind Energy Association
www.anev.org Associazione Nazionale Energia del Ven
www.auswind.org Australian Wind Energy Association
www.bwea.com British Wind Energy Associate
www.wind-energie.de Bundesverband Windenergie e.V
www.canwea.ca Canadian Wind Energy Association
www.creia.net Chinese Renewable Energy Industries Association
www.ewea.org European Wind Energy Association
www.gwec.net Global Wind Energy Council
www.indianwindpower.com Indian Wind Turbine Manufacturers Association
www.jwpa.jp Japanese Wind Power Association
www.wwindea.org World Wind Energy Associate
References
- ↑ https://en.wikipedia.org/wiki/Savonius_wind_turbine
- ↑ https://en.wikipedia.org/wiki/Darrieus_wind_turbine
- ↑ https://en.wikipedia.org/wiki/Giromill#Giromills
- ↑ https://en.wikipedia.org/wiki/Betz%27_law
- ↑ http://www.nrel.gov/wind/smallwind/mariah_power.html
- ↑ http://wepowereco.com/ecolutions/renewable-energy/wind/
