13 Jul '11, 7pm

Caltech Study Says Vertical Axis Wind Turbines 10X More Efficient Than Horizontal Axis Turbines

In a series of field tests that placed six VAWTs in different configurations, it was found that a spacing of four turbine diameters apart (about five meters) got rid of any aerodynamic interference between the turbines. HAWTs require 20 turbine diameters of spacing in order to eliminate aerodynamic interference, equaling more than a mile between each turbine. The six VAWTs were able to produce 21 to 47 watts of power per square meter, while a comparable HAWT farm only produces about two to three watts per square meter.

Full article: http://www.ecogeek.org/wind-power/3555-caltech-study-says...

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