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Elizabeth M
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Blogger
Re: Done before...
Elizabeth M   4/26/2013 5:30:54 AM
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I didn't know about that pnadams, thanks for the information. I will do some research. As this PowerWINDows technology is still in its early stages, perhaps there is some twist on the technology that can make it work. I think it's too early to tell.

Charles Murray
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Blogger
Re: Where are the turbines in the picture?
Charles Murray   4/25/2013 9:11:31 PM
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I agree that there seems to be more wind up high, William K. My information is purely anecdotal, but I was once up Chicago's Sears Tower (now called Willis Tower) and watched as a hanging ceiling fixture "swung" back and forth in an office on the 70th floor. It was explained to me that the hanging lamp often appeared to be swinging, when in fact it was not really moving at all. The truth was that the building was swaying and the hanging lamp was standing still. It takes quite a bit of wind to accomplish that. It probably doesn't prove much, but it's a good story, and it's true.

William K.
User Rank
Platinum
Re: Where are the turbines in the picture?
William K.   4/25/2013 6:59:21 PM
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Debera, you are certainly correct that if there is no wind then there is no energy capture. But I have found that on many occasions there is more wind up a couple of hundred feet than there is at ground level, which would seem to be a special case of the coanda effect coupled with laminar flow theory. BUT if there really is no wind, then the wind turbines would indeed be useless and a waste of resources. A really cheap check, which would educate the public as well as provide good information, would be to hange streamers from the areas where the wind turbines are proposed to be installed. If the streamers were always flying then there is wind, but if the streamers were never flying then the wind is simply not there. Cheap instrumentation indeed.

Debera Harward
User Rank
Silver
Re: Where are the turbines in the picture?
Debera Harward   4/25/2013 5:48:35 PM
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William , Everything agreed but what i think is there will be one drawback i.e absence of wind,It wont be able to produce energy in the areas where there is no wind ,This technology is usefull for only places where there is lot of wind

Debera Harward
User Rank
Silver
Re: Where are the turbines in the picture?
Debera Harward   4/25/2013 5:48:29 PM
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William , Everything agreed but what i think is there will be one drawback i.e absence of wind,It wont be able to produce energy in the areas where there is no wind ,This technology is usefull for only places where there is lot of wind

William K.
User Rank
Platinum
Where are the turbines in the picture?
William K.   4/25/2013 4:41:49 PM
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If the wind turbine is a horizontal axis device that looks a bit like a centifugal blower, then it certainly would be much less visible, and it might be less efficient as well. But wind is free, it is only the ROI that pushes for capturing the very most energy possible, disregarding appearance end everything else. A horizontal axis barrel-shaped turbine could be supported on both ends, making the structure easier to design, and allowing for a simpler suport arrangement. In addition there is that very real effect of tall buildings channeling the wind into high speed jetstreams, which might be used to an advantage in this application. 

But the very biggest advantage would be that the energy is being recovered in the area where it is needed, which would reduce the transport costs a lot.

pnadams
User Rank
Iron
Re: Done before...
pnadams   4/25/2013 1:51:47 PM
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Can you post a link or URL?

Rob Spiegel
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Blogger
Re: Wind keeps developing
Rob Spiegel   4/25/2013 1:43:57 PM
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Good point, My Design. Do you know what cities may be good choices for wind energy? Here in Albuquerque, we have a windy spring, but I don't believe we top 200 windy days. The need for consistent wind could create barriers to wind energy collection.

rainmaking
User Rank
Gold
Re: Done before...
rainmaking   4/25/2013 12:46:37 PM
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pnadams-

You are probably right with almost all of your comments, but not so much in the case of the vertical axis turbine. Our pitch-controlled vertical machine has a Cp higher than any traditional horizontal-axis turbine commercially available. It is also quieter, more bird friendly, and easier on the eyes than traditional machines. Unfortunately we only make a 70kW version at the moment.

DB_Wilson
User Rank
Gold
Concrete Canyons
DB_Wilson   4/25/2013 8:41:18 AM
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This may be very good in the concrete canyons in many large cities.  The channelling effects of the buildings will raise the wind speeds.  The channeling may help with the inability to turn the generator to face the wind.  This generator may be less of a problem with bird strikes than the rotating propeller type turbines.

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