arnyk wrote: > It seems like wind turbines would have to be thick and dense to > significantly slow down the wind. If they did so to any degree the > effect would be bounded by some reasonable distances above and around > them. > > Man made heat islands do seem to significantly affect weather patterns > over large areas but their areas of influence are huge and dense. > > At the least wind turbines can extract energy from wind without slowing > it, as they can extract significant energy by just making the wind > turbulent, thus increasing its entropy. > > That they make the wind downstream of them at last locally turbulent > seems to have a lot of evidence to support it in terms of the bird > kills, etc. > > The absence of clear and obvious evidence that they substantially slow > the wind could be meaningful.
Rather confused thinking there about extracting energy by making the wind turbulent. Turbulence creates drag, the last thing the windmill designers want. They want laminar flow creating variations in pressure as it flows over the blades, thus creating thrust which is translated to angular motion. this harvard study seems to suggest that the wind does slow down and may affect regional weather. http://wattsupwiththat.com/2013/02/25/rethinking-wind-power-harvard-study-shows-it-to-be-overestimated/ "Each wind turbine creates behind it a wind shadow in which the air has been slowed down by drag on the turbines blades. The ideal wind farm strikes a balance, packing as many turbines onto the land as possible, while also spacing them enough to reduce the impact of these wind shadows. But as wind farms grow larger, they start to interact, and the regional-scale wind patterns matter more." Touch optimisations http://touchsgotrythm.blogspot.co.uk/ ------------------------------------------------------------------------ SBGK's Profile: http://forums.slimdevices.com/member.php?userid=52003 View this thread: http://forums.slimdevices.com/showthread.php?t=104207
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