14 Jul '11, 1pm

Wind Farms Of Small Vertical Axis Turbines More Efficient, Cheaper Than Conventional Projects #greentech

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 better 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. Having every turbine turn in the opposite direction of its neighbors, the researchers found, also increases their efficiency, perhaps because the opposing spins decrease the drag on each turbine, allowing it to spin faster (Dabiri got the idea for using this type of constructive interference from his studies of schooling fish). (Eureka Alerts ) In tests, VAWTs generate 21-47 watts of power be square meter of land area of the proj...

Full article: http://www.treehugger.com/files/2011/07/wind-farms-small-...

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