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Why is this better than just putting a big cone around a small conventional wind turbine?

That would also 'concentrate' the wind.




It's being done, actually. Company called Ogin (was FloDesign Wind Turbine) is developing a 100 kW shrouded wind turbine that is similar to that idea. But it only works on small machines, can you imagine a 100 meter rotor with a shroud around it?

http://oginenergy.com/




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