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Directory:High-Efficiency Horizontal Axis Wind Turbines

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Some new wind turbine designs claim to exceed the Betz law theoretical maximum of 59% efficiency, with projected energy costs at or below grid rates.


Contents

DIY

  • Poor Man's Guide to Wind Power and Battery Systems - Downloadable book tells you how to make a 1 kilowatt machine using off-the shelf scraps for only $150, including the tower. Tells how to find and refurbish batteries for free; and how to source a good generator.

Companies

  • Wind > High-Efficiency Horizontal Axis >
    Loopwing Personal Wind Turbine - Because there are no blade tips, the Loopwing doesn't have tip vortex effects, and is therefore much quieter. This also reduces vibration, which helps with both noise and extending the life of the turbine and generator. The blade configuration is also responsible for its low start speed. (EcoGeek; April 30, 2007 {Loopwing site updated Sept. 2008})
  • Featured: Wind > High-Efficiency HAWT >
    Groundbreaking Energy Ball Wind Turbine for Home Power -The Energy Ball designed and built by Home Energy in the Netherlands, breaks from most wind turbine design by using a spherical structure. They say that by using such a design, significantly higher aerodynamic efficiency can be achieved (40% better efficiency), as compared to traditional designs. (PESWiki; Sept. 17, 2008)
  • Top 100 / Featured: Wind > Horizontal >
    FloDesign Wind Turbine Mimics Jet Turbine - FloDesign is working on a wind turbine concept that could potentially be at least twice as efficient as traditional rotor blade turbines, which force air around them instead of through them. First prototype will be 12 feet in diameter and produce 108 kW power. (PESWiki; Sept. 9, 2008)
  • Broadstar Wind Systems > New generation wind turbine - BroadStar's AeroCam is claimed to be the first turbine to break through the $1/watt cost barrier. It enables distributed power generation in almost any setting, including densely populated urban areas and can capture abundant surface-wind energy in wind farms. (EnergyCurrent; June 2, 2008)
  • AeroVironment - AV developed a small, modular wind turbine Architectural Wind™ system designed for installation on buildings in urban and suburban areas. By eliminating the support tower, reducing noise and vibration, and creating a sleek and adaptable, modular housing that installs quickly and easily onto buildings, without penetrating the roof, AV defines a new category of wind energy systems that adds value to buildings and demonstrates clean energy at work.

(1.43 Minutes) Winds of Change Reporter Ben McCain and news cameraman John Mann visit AeroVironment in Monrovia California. A company founded by the late Dr Paul MacCready. This report is about Wind Turbines used in industrial locations. (YouTube march 26, 2008)

  • MotorWind's Pastic Micro Wind Turbines for Sale - Two of the biggest hurdles for using wind power have been cost and the need for strong winds. A Hong Kong businessman/inventor has found a way to overcome those problems with plastic, bringing the generation cost down to around 1 cent per kilowatt-hour.
  • Stormblade Turbine - Can convert up to 70% of wind power into electricity with operational wind speed 7mph to >120mph, double the current averages. It produces less drag, can operate at extreme wind speeds, produces more power per rotation, needs less maintenance, is smaller in size, is wildlife friendly, produces less noise. See also British Design Innovation
  • Venturiwind Turbine - Wind tunnel measurements at a Dutch university have shown that a three blade Venturi turbine has a measured efficiency of 85%, which is 40% better than the theoretical maximum efficiency 59% (Betz law). Advantages: high output in low wind, soundless, highly reliable, cost effective and attractive. See also Aerolift Patent
  • Enflo Windtec - The power increase compared to a free-running propeller, results from the airfoil diffuser accelerating wind flow through the rotor. There is only a small gap between rotor and the diffuser, so that wind cannot ‘escape’ the rotor, hence increasing its effective area. Efficiency is 83% compared to 29% for a free running propeller. Videos
  • O'Conner Hush Energy Turbine - Arthur O'Conner of Australia has international patents on a wind turbine design that is very quiet, can operate at low speeds while tolerating high wind speeds, with a price tag that makes energy generation comparable to grid energy cost for residential and commercial applications.
  • Roof-top affordable clean energy - Marquiss Wind Power manufactures roof-top ducted wind turbines that accelerate the wind speed to increase power output, for commercial buildings. Payback ranges from 2 to 7 years, and the systems tie into the utility grid. (Renewable Energy Access; Jan. 28, 2008)
  • Selsam - Combines the power of multiple smaller rotors mounted to a single elongate driveshaft, to give the same power as a single larger rotor, with less cost, weight, and complexity. Smaller rotors weigh less for the swept area, and turn faster, thereby dispensing of the need for a gearbox. Design is naturally self-aiming, and requires less maintenance.
  • Top 100 / Featured: Wind > High Efficiency HAWT >
    ENECO's Wind Amplified Rotor Platform (WARP) - The WARP design speeds up the wind with a velocity amplification factor in excess of 1.5 over free wind, resulting in a 4.5-fold increase in power. A WARP wind farm would need on average about 80% less land per kilowatt of energy generated. Projected cost $.02 to $.04/kW-h or lower. (PESWiki; Sept. 11, 2008)
  • Loopwing Wind Turbine - The Loopwing turbine is a low-noise, low-vibration, self-stabilizing device designed for quiet home use that requires only a 1.6 m/s breeze to get started. It generates twice the torque of conventional turbines at half the rotation speed. The blade shape restrains noise causing tip vortex. (Metaefficient)
  • Wind Energy Group - The WEGI-100 offers a variety of advantages over conventional wind generating systems. It is a low rpm, Bi-directional system. Horizontal blades and air baffles maximize the amount of wind velocity directed into the turbine allowing the system to capture more wind. The system can also operate under extremely high wind conditions.
  • The piezoelectric windmill project

In the News

  • Attey Rooftop Wind Turbine - Graeme Attey of Fremantle, West Australia, designed a modular wind turbine small enough to sit on a the roof of house. Backed by the government, the unit is expected to be released to the market next year, complete with a rebate. (ABC News; June 27, 2007)
  • Shrouded in near-silence - A new design of wind turbine called the Stormblade could provide significantly better power output than existing mills, while reducing noise and maintenance. The blades are surrounded by a shroud that channels the airflow onto the turbine, with efficiency up to three times higher than a traditional three-bladed mill. (The Engineer Online; June 05, 2006)
  • Stormblade: the first quiet residential wind turbine - Besides being bird and bat friendly, the Stormblade design is very quiet. It has fewer parts and higher generating capacity than other models and can theoretically, operate at any wind speed; and can convert up to 70 per cent of wind power into electricity, double the current average. (TreeHugger; Jan. 2, 2007)

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