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Helix Wind
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Savonius Wind Turbines What is a savonius wind turbine - savonius (VAWT) home > wind | education A Savonius is a type of vertical axis wind turbine (VAWT) generator invented in 1922 by Sigurd Johannes Savonius from Finland though similar wind turbine designs had been attempted in previous centuries. The Savonius is a drag-type VAWT which operates in the same way as a cup anemometer (pictured below). Looking at the anemometer, it has three cups mounted on a rotor which is free to spin. When the rotor has spun around one-third of a revolution, the cup which was open to the wind will now be back on, and one of the previously back on to the wind cups will have spun around on the rotor to offer its open face into the wind. With a Savonius wind turbine it does not matter from which direction the wind is blowing, since there will always be more force exerted on whichever cup has its open face into the wind, and this will push the rotor around. Savonius Wind Turbines for Electricity Generation Comment on this Article

Vacuum Glass Kind Skylight Tube - Buy Skylight Tube,58mm*1800mm Vacuum Tube,Evacuated Glass Tube Product on Alibaba Skylight Tube Common Vacuum tube Size: 47mmx1500mm,47mmx1800mm, 58mmx1500mm,58mmx1800mm, Primary advantage: 1) CE, ISO9001, CCC, EN12975 certified2) Competitive price on same quality level3) Prompt delivery 4) Environmental protection 5) Small order and OEM order accepted Please feel free to contact me for offer and more details. Small Wind Turbine Farm Nearly Complete at Quinnipiac University Adobe’s installation of 20 small wind turbines on the sixth floor of their headquarters building made big news recently. But this is even bigger. Quinnipiac University in Connecticut is putting the finishing touches on a micro wind turbine cluster on its new green campus in York Hill. It’s not a lot, but it’s enough to power half of the external site lights for the 250-acre campus. This is likely the first cluster of its kind to be installed on an American college campus. Jeff Riley, FAIA, Centerbrook partner in charge of the project, recently said, “Wind power is one of a number of green technologies and approaches incorporated into the site design.” Incidentally, the small wind turbine market is doing great lately. Photo and rendering credits: Centerbrook. Article tags: alternative energy, small wind, VAWT

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Fish hold the key to better wind farms According to Robert W. Whittlesey, Sebastian Liska and John O. Dabiri over at the California Institute of Technology in Pasadena, wind farms could generate significantly more power if they were more fish-like. Wind farms traditionally use the horizontal axis (HAWTs). But since they slow the air passing through them, neighboring turbines need to be around 10 turbine diameters apart. Turbines on a vertical axis (VAWTs) can actually do better than their horizontal peers when closely packed together. The repeating vortices in an air stream around a body are relatively common. Studies have shown that aerodynamic interactions between a pair of counter-rotating VAWTs contribute to a higher power coefficient per turbine. So the Caltech students designed a model to simulate the vortices of a 16 x 16 wind farm of vertical axis turbines and study the effects of closely packing them together. A full order of magnitude increase in power density — not bad!

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Wind Farms Of Small Vertical Axis Turbines More Efficient, Cheaper Than Conventional Projects photo: John Dabiri/Caltech An interesting new study in the Journal of Renewable and Sustainable Energy turns on its head conventional wisdom about both the optimum technical solution and spacing for wind power projects so that they generate the most electricity.Researchers from the California Institute of Technology found that large horizontal axis wind turbines, broadly spaced (as in what you likely think of in a commercial wind farm) are far bettered by using shorter, vertical axis turbines, tightly spaced. VAWTs are ideal, [John] Dabiri says, because they can be positioned very close to one another. This lets them capture nearly all of the energy of the blowing wind and even wind energy above the farm. In tests, VAWTs generate 21-47 watts of power be square meter of land area of the project, compared 2-3 watts for the HAWTs.

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Des micro-éoliennes partout Quand nous pensons éoliennes, nous envisageons aujourd'hui ces grandes antennes d'une centaine de mètres de hauteur, qui provoquent des résistances devant leur gigantisme. Certes, elles se développeront, mais essentiellement en off-shore flottant loin des côtes touristiques. Non, ce qui va devenir banal, partout dans les paysages urbains, c'est la présence habituelle de micro-éoliennes. Il s'agit d'unités très petites, à axe vertical, faisant rarement plus d'un mètre de hauteur, installées sur les toits et sur les poteaux. Pourtant, elles ont d'immenses avantages : produite en grande série, leur coût s'effondre. Les éoliennes à axe vertical ont un autre avantage : contrairement à leurs cousines à axes verticales, elles font très peu de bruits. Enfin, elles peuvent être installées partout, avec une grande facilité. Certes, la puissance nominale de chaque micro-éolienne est très faible. Les micro-éoliennes sont ignorées par la majorité des spécialistes des problèmes énergétiques.

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En images : nouveau souffle pour l'énergie éolienne et des projets novateurs En images : nouveau souffle pour l'énergie éolienne et des projets novateurs - 4 Photos Les vents qui passent au-dessus de l'Europe représentent une énergie équivalente à celle de 100 000 centrales nucléaires ! Voilà qui a de quoi faire réfléchir en prévision de l'après-pétrole. Encore faut-il savoir comment puiser dans cette manne. Mais ces énormes hélices ne peuvent utiliser que les vents proches du sol, c'est-à-dire les plus faibles. En matière d'énergie éolienne, il est clair qu'il n'existe pas de solution unique, susceptible de s'appliquer partout. Kite Wind Generator : une centrale en forme de manège C'est probablement aujourd'hui le projet le plus impressionnant. Des cerfs-volants en batteries, montant entre 150 et 700 mètres, font tourner un manège de quelques centaines de mètres de diamètre. Pour que cela fonctionne, les dimensions doivent être généreuses : au moins cent mètres de diamètres pour la roue. M. Un générateur fixé sur l'axe fabrique de l'électricité.

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