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v t e

A wind turbine is a device that converts kinetic energy from the wind, also called wind energy, into mechanical energy; a process known as wind power. If the mechanical energy is used to produce electricity, the device may be called wind turbine or wind power plant. If the mechanical energy is used to drive machinery, such as for grinding grain or pumping water, the device is called a windmill or wind pump. Similarly, it may be called wind charger when it is used to charge batteries.

The result of over a millennium of windmill development and modern engineering, today's wind turbines are manufactured in a wide range of vertical and horizontal axis types. The smallest turbines are used for applications such as battery charging or auxiliary power on boats; while large grid-connected arrays of turbines are becoming an increasingly important source of wind power-produced commercial electricity.

History

Windmills were used in Persia (present-day Iran) as early as 200 B.C. The windwheel of Heron of Alexandria marks one of the first known instances of wind powering a machine in history. However, the first known practical windmills were built in Sistan, a region between Afghanistan and Iran, from the 7th century. These "Panemone" were vertical axle windmills, which had long vertical driveshafts with rectangular blades. Made of six to twelve sails covered in reed matting or cloth material, these windmills were used to grind grain or draw up water, and were used in the gristmilling and sugarcane industries.

Windmills first appeared in Europe during the middle ages. The first historical records of their use in England date to the 11th or 12th centuries and there are reports of German crusaders taking their windmill-making skills to Syria around 1190. By the 14th century, Dutch windmills were in use to drain areas of the Rhine delta.

The first electricity-generating wind turbine was a battery charging machine installed in July 1887 by Scottish academic James Blyth to light his holiday home in Marykirk, Scotland. Some months later American inventor Charles F Brush built the first automatically operated wind turbine for electricity production in Cleveland, Ohio. Although Blyth's turbine was considered uneconomical in the United Kingdom electricity generation by wind turbines was more cost effective in countries with widely scattered populations.

In Denmark by 1900, there were about 2500 windmills for mechanical loads such as pumps and mills, producing an estimated combined peak power of about 30 MW. The largest machines were on 24-metre (79 ft) towers with four-bladed 23-metre (75 ft) diameter rotors. By 1908 there were 72 wind-driven electric generators operating in the US from 5 kW to 25 kW. Around the time of World War I, American windmill makers were producing 100,000 farm windmills each year, mostly for water-pumping. By the 1930s, wind generators for electricity were common on farms, mostly in the United States where distribution systems had not yet been installed. In this period, high-tensile steel was cheap, and the generators were placed atop prefabricated open steel lattice towers.

A forerunner of modern horizontal-axis wind generators was in service at Yalta, USSR in 1931. This was a 100 kW generator on a 30-metre (98 ft) tower, connected to the local 6.3 kV distribution system. It was reported to have an annual capacity factor of 32 per cent, not much different from current wind machines. In the fall of 1941, the first megawatt-class wind turbine was synchronized to a utility grid in Vermont. The Smith-Putnam wind turbine only ran for 1,100 hours before suffering a critical failure. The unit was not repaired because of shortage of materials during the war.

The first utility grid-connected wind turbine to operate in the UK was built by John Brown & Company in 1951 in the Orkney Islands.

As of 2012, Danish company Vestas is the world's biggest wind-turbine manufacturer.

Resources

A quantitative measure of the wind energy available at any location is called the Wind Power Density (WPD) It is a calculation of the mean annual power available per square meter of swept area of a turbine, and is tabulated for different heights above ground. Calculation of wind power density includes the effect of wind velocity and air density. Color-coded maps are prepared for a particular area described, for example, as "Mean Annual Power Density at 50 Metres". In the United States, the results of the above calculation are included in an index developed by the National Renewable Energy Laboratory and referred to as "NREL CLASS". The larger the WPD calculation, the higher it is rated by class. Classes range from Class 1 (200 watts per square metre or less at 50 m altitude) to Class 7 (800 to 2000 watts per square m). Commercial wind farms generally are sited in Class 3 or higher areas, although isolated points in an otherwise Class 1 area may be practical to exploit.

Wind turbines are classified by the wind speed they are designed for, from class I to class IV, with A or B referring to the turbulence.

== Efficiency == 4

Theoretical power captured by a wind turbine

Total wind power could be captured only if the wind velocity is reduced to zero. In a realistic wind turbine this is impossible, as the captured air must also leave the turbine. A relation between the input and output wind velocity must be considered. Using the concept of stream tube, the maximal achievable extraction of wind power by a wind turbine is 59% of the total theoretical wind power (see: Betz' law).

Practical wind turbine power

Further insufficiencies, such as rotor blade friction and drag, gearbox losses, generator and converter losses, reduce the power delivered by a wind turbine. The basic relation that the turbine power is (approximately) proportional to the third power of velocity remains.

Types

Wind turbines can rotate about either a horizontal or a vertical axis, the former being both older and more common.

Horizontal axis

Horizontal-axis wind turbines (HAWT) have the main rotor shaft and electrical generator at the top of a tower, and must be pointed into the wind. Small turbines are pointed by a simple wind vane, while large turbines generally use a wind sensor coupled with a servo motor. Most have a gearbox, which turns the slow rotation of the blades into a quicker rotation that is more suitable to drive an electrical generator.

Since a tower produces turbulence behind it, the turbine is usually positioned upwind of its supporting tower. Turbine blades are made stiff to prevent the blades from being pushed into the tower by high winds. Additionally, the blades are placed a considerable distance in front of the tower and are sometimes tilted forward into the wind a small amount.

Downwind machines have been built, despite the problem of turbulence (mast wake), because they don't need an additional mechanism for keeping them in line with the wind, and because in high winds the blades can be allowed to bend which reduces their swept area and thus their wind resistance. Since cyclical (that is repetitive) turbulence may lead to fatigue failures, most HAWTs are of upwind design.

Turbines used in wind farms for commercial production of electric power are usually three-bladed and pointed into the wind by computer-controlled motors. These have high tip speeds of over 320 km/h (200 mph), high efficiency, and low torque ripple, which contribute to good reliability. The blades are usually colored white for daytime visibility by aircraft and range in length from 20 to 40 metres (66 to 131 ft) or more. The tubular steel towers range from 60 to 90 metres (200 to 300 ft) tall. The blades rotate at 10 to 22 revolutions per minute. At 22 rotations per minute the tip speed exceeds 90 metres per second (300 ft/s). A gear box is commonly used for stepping up the speed of the generator, although designs may also use direct drive of an annular generator. Some models operate at constant speed, but more energy can be collected by variable-speed turbines which use a solid-state power converter to interface to the transmission system. All turbines are equipped with protective features to avoid damage at high wind speeds, by feathering the blades into the wind which ceases their rotation, supplemented by brakes.

Vertical axis design

Vertical-axis wind turbines (or VAWTs) have the main rotor shaft arranged vertically. Key advantages of this arrangement are that the turbine does not need to be pointed into the wind to be effective. This is an advantage on sites where the wind direction is highly variable, for example when integrated into buildings. The key disadvantages include the low rotational speed with the consequential higher torque and hence higher cost of the drive train, the inherently lower power coefficient, the 360 degree rotation of the aerofoil within the wind flow during each cycle and hence the highly dynamic loading on the blade, the pulsating torque generated by some rotor designs on the drive train, and the difficulty of modelling the wind flow accurately and hence the challenges of analysing and designing the rotor prior to fabricating a prototype.

With a vertical axis, the generator and gearbox can be placed near the ground, using a direct drive from the rotor assembly to the ground-based gearbox, hence improving accessibility for maintenance.

When a turbine is mounted on a rooftop, the building generally redirects wind over the roof and this can double the wind speed at the turbine. If the height of the rooftop mounted turbine tower is approximately 50% of the building height, this is near the optimum for maximum wind energy and minimum wind turbulence. It should be borne in mind that wind speeds within the built environment are generally much lower than at exposed rural sites, noise may be a concern and an existing house may not adequately resist the additional stress.

Another type of vertical axis is the Parallel turbine similar to the crossflow fan or centrifugal fan it uses the ground effect. Vertical axis turbines of this type have been tried for many years: a large unit producing up to 10 kW was built by Israeli wind pioneer Bruce Brill in 1980s: the device is mentioned in Dr. Moshe Dan Hirsch's 1990 report, which decided the Israeli energy department investments and support in the next 20 years. The Magenn WindKite blimp uses this configuration as well, chosen because of the ease of running.

Subtypes of the vertical axis design include:

Darrieus wind turbine

"Eggbeater" turbines, or Darrieus turbines, were named after the French inventor, Georges Darrieus. They have good efficiency, but produce large torque ripple and cyclical stress on the tower, which contributes to poor reliability. They also generally require some external power source, or an additional Savonius rotor to start turning, because the starting torque is very low. The torque ripple is reduced by using three or more blades which results in greater solidity of the rotor. Solidity is measured by blade area divided by the rotor area. Newer Darrieus type turbines are not held up by guy-wires but have an external superstructure connected to the top bearing.

Giromill

A subtype of Darrieus turbine with straight, as opposed to curved, blades. The cycloturbine variety has variable pitch to reduce the torque pulsation and is self-starting. The advantages of variable pitch are: high starting torque; a wide, relatively flat torque curve; a higher coefficient of performance; more efficient operation in turbulent winds; and a lower blade speed ratio which lowers blade bending stresses. Straight, V, or curved blades may be used.

Savonius wind turbine

These are drag-type devices with two (or more) scoops that are used in anemometers, Flettner vents (commonly seen on bus and van roofs), and in some high-reliability low-efficiency power turbines. They are always self-starting if there are at least three scoops.

Twisted Savonius

Twisted Savonius is a modified savonius, with long helical scoops to provide smooth torque. This is often used as a rooftop windturbine and has even been adapted for ships.

Design and construction

]

Wind turbines are designed to exploit the wind energy that exists at a location. Aerodynamic modelling is used to determine the optimum tower height, control systems, number of blades and blade shape.

Wind turbines convert wind energy to electricity for distribution. Conventional horizontal axis turbines can be divided into three components:

• The rotor component, which is approximately 20% of the wind turbine cost, includes the blades for converting wind energy to low speed rotational energy.
• The generator component, which is approximately 34% of the wind turbine cost, includes the electrical generator, the control electronics, and most likely a gearbox (e.g. planetary gearbox, adjustable-speed drive or continuously variable transmission) component for converting the low speed incoming rotation to high speed rotation suitable for generating electricity.
• The structural support component, which is approximately 15% of the wind turbine cost, includes the tower and rotor yaw mechanism.

A 1.5 MW wind turbine of a type frequently seen in the United States has a tower 80 metres (260 ft) high. The rotor assembly (blades and hub) weighs 48,000 pounds (22,000 kg). The nacelle, which contains the generator component, weighs 115,000 pounds (52,000 kg). The concrete base for the tower is constructed using 58,000 pounds (26,000 kg) of reinforcing steel and contains 250 cubic yards (190 m) of concrete. The base is 50 ft (15 m) in diameter and 8 ft (2.4 m) thick near the center.

Unconventional designs

One E-66 wind turbine at Windpark Holtriem, Germany, carries an observation deck, open for visitors. Another turbine of the same type, with an observation deck, is located in Swaffham, England. Airborne wind turbines have been investigated many times but have yet to produce significant energy. Conceptually, wind turbines may also be used in conjunction with a large vertical solar updraft tower to extract the energy due to air heated by the sun.

Wind turbines which utilise the Magnus effect have been developed.

The ram air turbine is a specialist form of small turbine that is fitted to some aircraft. When deployed, the RAT is spun by the airstream going past the aircraft and can provide power for the most essential systems if there is a loss of all on–board electrical power.

Small wind turbines

Small wind turbines may be used for a variety of applications including on- or off-grid residences, telecom towers, offshore platforms, rural schools and clinics, remote monitoring and other purposes that require energy where there is no electric grid, or where the grid is unstable. Small wind turbines may be as small as a fifty-watt generator for boat or caravan use. The U.S. Department of Energy's National Renewable Energy Laboratory (NREL) defines small wind turbines as those smaller than or equal to 100 kilowatts. Small units often have direct drive generators, direct current output, aeroelastic blades, lifetime bearings and use a vane to point into the wind.

Larger, more costly turbines generally have geared power trains, alternating current output, flaps and are actively pointed into the wind. Direct drive generators and aeroelastic blades for large wind turbines are being researched.

Wind turbine spacing

On most horizontal windturbine farms, a spacing of about 6-10 times the rotor diameter is often upheld. However, for large wind farms distances of about 15 rotor diameters should be more economically optimal, taking into account typical wind turbine and land costs. This conclusion has been reached by research conducted by Charles Meneveau of the Johns Hopkins University, and Johan Meyers of Leuven University in Belgium, based on computer simulations that take into account the detailed interactions among wind turbines (wakes) as well as with the entire turbulent atmospheric boundary layer. Moreover, recent research by John Dabiri of Caltech suggests that vertical wind turbines may be placed much more closely together so long as an alternating pattern of rotation is created allowing blades of neighbouring turbines to move in the same direction as they approach one another.

Accidents

Several cases occurred where the housings of wind turbines caught fire. As housings are normally out of the range of standard fire extinguishing equipment, it is nearly impossible to extinguish such fires on older turbine units which lack fire suppression systems. In several cases one or more blades were damaged or torn away. In 2010 70 mph (110 km/h; 61 kn) storm winds damaged some blades, prompting blade removal and inspection of all 25 wind turbines in Campo Indian Reservation in the US State of California. Several wind turbines also collapsed.

Records

Largest capacity

The Enercon E-126 has a rated capacity of 7.58 MW, has an overall height of 198 m (650 ft), a diameter of 126 m (413 ft), and is the world's largest-capacity wind turbine since its introduction in 2007. At least five companies are working on the development of a 10MW turbine.

Largest swept area

The turbine with the largest swept area is the Siemens SWT-6.0-154, with a diameter of 154 m, giving a total sweep of 18,600 m

Tallest

The tallest wind turbines are two standing in Paproć, Poland, 210 meters tall, constructed in late 2012. Their axis have the same height as previous tallest turbine, Fuhrländer Wind Turbine Laasow, that is 160 meters, but their rotors reach 210 against the Fuhrländer's 205 meters. Those three turbines are the only ones in the world taller than 200 meters.

Largest vertical-axis

Le Nordais wind farm in Cap-Chat, Quebec has a vertical axis wind turbine (VAWT) named Éole, which is the world's largest at 110 m. It has a nameplate capacity of 3.8MW.

Most southerly

The turbines currently operating closest to the South Pole are three Enercon E-33 in Antarctica, powering New Zealand's Scott Base and the United States' McMurdo Station since December 2009 although a modified HR3 turbine from Northern Power Systems operated at the Amundsen-Scott South Pole Station in 1997 and 1998. In March 2010 CITEDEF designed, built and installed a wind turbine in Argentine Marambio Base.

Most productive

Four turbines at Rønland wind farm in Denmark share the record for the most productive wind turbines, with each having generated 63.2 GWh by June 2010

Highest-situated

The world's highest-situated wind turbine is made by DeWind installed by the Seawind Group and located in the Andes, Argentina around 4,100 metres (13,500 ft) above sea level. The site uses a type D8.2 - 2000 kW / 50 Hz turbine. This turbine has a new drive train concept with a special torque converter (WinDrive) made by Voith and a synchronous generator. The WKA was put into operation in December 2007 and has supplied the Veladero mine of Barrick Gold with electricity since then.

Largest floating wind turbine

The world's largest—and also the first operational deep-water large-capacity—floating wind turbine is the 2.3 MW Hywind currently operating 10 kilometres (6.2 mi) offshore in 220-meter-deep water, southwest of Karmøy, Norway. The turbine began operating in September 2009 and utilizes a Siemens 2.3 MW turbine

Horizontal axis wind turbines

A list of the different models of wind turbines from the top 10 wind turbine manufacturers by market share:

See also

• Small wind turbine
• Compact wind acceleration turbine
• Environmental effects of wind power
• Éolienne Bollée
• List of wind turbine manufacturers
• List of wind turbines
• Wind farm
• Wind turbines on public display
• Windpump
• Windbelt

References

1. "Part 1 — Early History Through 1875". Retrieved 2008-07-31.
2. A.G. Drachmann, "Heron's Windmill", Centaurus, 7 (1961), pp. 145–151
3. Dietrich Lohrmann, "Von der östlichen zur westlichen Windmühle", Archiv für Kulturgeschichte, Vol. 77, Issue 1 (1995), pp. 1–30 (10f.)
4. Ahmad Y Hassan, Donald Routledge Hill (1986). Islamic Technology: An illustrated history, p. 54. Cambridge University Press. ISBN 0-521-42239-6.
5. Donald Routledge Hill, "Mechanical Engineering in the Medieval Near East", Scientific American, May 1991, p. 64-69. (cf. Donald Routledge Hill, Mechanical Engineering)
6. ^ Morthorst, Poul Erik; Redlinger, Robert Y.; Andersen, Per (2002). Wind energy in the 21st century: economics, policy, technology and the changing electricity industry. Houndmills, Basingstoke, Hampshire: Palgrave/UNEP. ISBN 0-333-79248-3. {{cite book}}: |access-date= requires |url= (help)CS1 maint: multiple names: authors list (link)
7. ^ "James Blyth". Oxford Dictionary of National Biography. Oxford University Press. Retrieved 2009-10-09.
8. A Wind Energy Pioneer: Charles F. Brush. Danish Wind Industry Association. Retrieved 2008-12-28.
9. Quirky old-style contraptions make water from wind on the mesas of West Texas
10. Alan Wyatt: Electric Power: Challenges and Choices. Book Press Ltd., Toronto 1986, ISBN 0-920650-00-7
11. Anon. "Costa Head Experimental Wind Turbine". Orkney Sustainable Energy Website. Orkney Sustainable Energy Ltd. Retrieved 19 December 2010.
12. NREL: Dynamic Maps, GIS Data, and Analysis Tools - Wind Maps
13. IEC Wind Turbine Classes June 7, 2006
14. The Physics of Wind Turbines Kira Grogg Carleton College, 2005, p.8
15. "Wind Energy Basics". American Wind Energy Association. Retrieved 2009-09-24.
16. http://www.windpower.org/en/tour/wtrb/comp/index.htm
17. Products & Services
18. Technical Specs of Common Wind Turbine Models [AWEO.org]
19. http://www.awsopenwind.org/downloads/documentation/ModelingUncertaintyPublic.pdf
20. Windspeed in the city - reality versus the DTI database
21. http://www.urbanwind.net/pdf/technological_analysis.pdf
22. Modular wind energy device - Brill, Bruce I
23. Insource/Outsource: 2007-09-16
24. Vertical-Axis Wind Turbines | Symscape
25. Exploit Nature-Renewable Energy Technologies by Gurmit Singh‏, Aditya Books, pp 378
26. http://www.awea.org/faq/vawt.html
27. Experimental Mechanics, Volume 18, Number 1 - SpringerLink
28. Rob Varnon. Derecktor converting boat into hybrid passenger ferry, Connecticut Post website, December 2, 2010. Retrieved April 25, 2012.
29. ZF Friedrichshafen AG
30. djtreal.com - de beste bron van informatie over djtreal. Deze website is te koop!
31. John Gardner, Nathaniel Haro and Todd Haynes (2011). "Active Drivetrain Control to Improve Energy Capture of Wind Turbines" (Document). Boise State UniversityTemplate:Inconsistent citations {{cite document}}: Unknown parameter |accessdate= ignored (help); Unknown parameter |month= ignored (help); Unknown parameter |separator= ignored (help); Unknown parameter |url= ignored (help)CS1 maint: postscript (link)
32. "Wind Turbine Design Cost and Scaling Model", Technical Report NREL/TP-500-40566, December, 2006, page 35, 36
33. http://www.pomeroyiowa.com/windflyer.pdf
34. Spiral Magnus|MECARO|Introducuction to Magnus
35. Small Wind, U.S. Department of Energy National Renewable Energy Laboratory website
36. J. Meyers and C. Meneveau, "Optimal turbine spacing in fully developed wind farm boundary layers" (2011), Wind Energy doi:10.1002/we.469
37. Optimal spacing for wind turbines
38. M. Calaf, C. Meneveau and J. Meyers, "Large Eddy Simulation study of fully developed wind-turbine array boundary layers" (2010), Phys. Fluids 22, 015110
39. Dabiri, J. Potential order-of-magnitude enhancement of wind farm power density via counter-rotating vertical-axis wind turbine arrays (2011), J. Renewable Sustainable Energy 3, 043104
40. WindByte.co.uk website
41. Windstorm damage, SignOnSanDiego.com website
42. ^ Umfaller im Windpark Ellenstedt in der Nähe von Vechta
43. Oregon OSHA releases findings in wind turbine collapse
44. "Probe into wind turbine collapse". {{cite news}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
45. Ron's Log: Wind Energy
46. Nordtank (Vestas) wind system fail and crashes. - YouTube
47. Strong wind destroys Searsburg wind turbine : Rutland Herald Online
48. Lightning Possible Cause of Turbine Fire | WXGuard Wind
49. Better Plan: The Trouble With Industrial Wind Farms in Wisconsin - Today's Special Feature - 12/28/09 UPDATE on yesterday's turbine collapse: Another One Bites the Dust: What ...
50. Wind Turbine Explodes Into Flames : Discovery News
51. http://www.enercon.de/p/downloads/EN_Produktuebersicht_0710.pdf
52. "New Record: World's Largest Wind Turbine (7+ Megawatts) — MetaEfficient Reviews". MetaEfficient.com. 2008-02-03. Retrieved 2010-04-17.
53. Siemens brochure
54. Siemens starts field tests of biggest rotor offshore turbine
55. "FL 2500 Noch mehr Wirtschaftlichkeit" (in German). Fuhrlaender AG. Retrieved 2009-11-05.
56. "Nowy Tomyśl: powstały najwyższe wiatraki na świecie!" (in Polish). Epoznan. Retrieved 2012-12-04.
57. "Visits > Big wind turbine". Retrieved 2010-04-17.
58. "Wind Energy Power Plants in Canada - other provinces". 2010-06-05. Retrieved 2010-08-24.
59. Antarctica New Zealand
60. New Zealand Wind Energy Association
61. Bill Spindler, The first Pole wind turbine.
62. GENERADOR DE ENERGÍA EÓLICA EN LA ANTÁRTIDA
63. "Surpassing Matilda: record-breaking Danish wind turbines". Retrieved 2010-07-26.
64. Voith | Voith Turbo
65. Patel, Prachi (2009-06-22). "Floating Wind Turbines to Be Tested". IEEE Spectrum. Retrieved 2011-03-07. will test how the 2.3-megawatt turbine holds up in 220-meter-deep water.
66. Madslien, Jorn (8 September 2009). "Floating challenge for offshore wind turbine". BBC News. BBC. Retrieved 2011-03-07. world's first full-scale floating wind turbine
67. Technical specifications
68. [http://www.energy.siemens.com/us/pool/hq/power-generation/renewables/wind-power/6_MW_Brochure_Jan.2012.pdf Siemens 6.0 MW Offshore Wind Turbine]
69. Gamesa 5.0 MW
70. Gamesa launches its new G136-4.5 MW turbine, designed for low-wind sites
71. Gamesa G136-4.5 MW
72. Gamesa 4.5 MW
73. 4.1-113 Offshore Wind Turbine
74. ^ Technical Parameters
75. Siemens 3.0 MW Direct Drive Wind Turbines
76. V112-3.0 MW
77. V112-3.0 MW Offshore
78. V90-3.0
79. ^ Mingyang Wind Power
80. SL3000 Series Wind Turbine
81. ^ GE's 2.75 MW Wind Turbines
82. ^ GW 2.5 PMDD Wind Turbine
83. E-70 / 2,300 kW
84. Siemens SWT-2.3-113
85. Siemens Wind Turbine SWT-2.3-108
86. Wind Turbine SWT-2.3-101
87. Wind Turbine SWT-2.3-93
88. S88 MARK II DFIG 2.25 MW
89. Introducing the S9X
90. S88-2.1 MW
91. E-82 E2 / 2,000 kW
92. Gamesa launches a new turbine, the G114-2.0 MW: maximum returns for low-wind sites
94. Gamesa maintained profitability and sound financial position in a situation of economic weakness and regulatory uncertainty
95. Gamesa G97-2.0 MW IIIA
96. Gamesa supplies 9 latest generation wind turbines to wind farms in Albacete
97. Gamesa G87-2.0 MW
98. Gamesa G80-2.0 MW
99. ^ Vestas 2MW
100. ^ GE's 1.6 MW Wind Turbines
101. GE 1.5-77 Wind Turbines
102. GE 1.5 MW Wind Turbine
103. GE1.5
104. ^ GW 1.5 PMDD Wind Turbine
105. ^ Mingyang Wind Power
106. S82-1.5 MW
107. Eternal Power from Sinovel
108. S66-1.25 MW
109. ^ S64-1.25 MW
110. Enercon Product Overview
111. Gamesa G58-850 kW
112. Gamesa G52-850 kW
113. E-53 / 800 kW
114. E-48 / 800 kW
115. S52-600 kW

Further reading

• Tony Burton, David Sharpe, Nick Jenkins, Ervin Bossanyi: Wind Energy Handbook, John Wiley & Sons, 1st edition (2001), ISBN 0-471-48997-2
• Darrell, Dodge, Early History Through 1875, TeloNet Web Development, Copyright 1996–2001
• David, Macaulay, New Way Things Work, Houghton Mifflin Company, Boston, Copyright 1994–1999, pg.41-42
• Erich Hau Wind turbines: fundamentals, technologies, application, economics Birkhäuser, 2006 ISBN 3-540-24240-6 (preview on Google Books)
• David Spera (ed,) Wind Turbine Technology: Fundamental Concepts in Wind Turbine Engineering, Second Edition (2009), ASME Press, ISBN #: 9780791802601

External links

• Harvesting the Wind (45 lectures about wind turbines by professor Magdi Ragheb
• Wind Projects
• Guided tour on wind energy
• Wind Energy Technology World Wind Energy Association
• Wind turbine simulation, National Geographic
• Airborne Wind Industry Association international
• The Top 10 biggest wind turbines in the world

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