Wind turbine breakthrough or hogwash
Wind turbine breakthrough or hogwash
(OP)
thread626-64614: Funneling wind
Investigating most efficient home turbine systems and came across this product. It claims setting up a vaccuum behind the turbine and blades will double the air flow. Is this correct science? It's an ugly beast.
Investigating most efficient home turbine systems and came across this product. It claims setting up a vaccuum behind the turbine and blades will double the air flow. Is this correct science? It's an ugly beast.





RE: Wind turbine breakthrough or hogwash
What is the material and energy cost involved in setting up the vacuum? That is NOT free and the typical result is that you cannot get more differential power out of a subsystem that you have to add energy to first in order to get it set up. Things of that nature are normally either bad ideas, or very bad ideas.
It's like if I could pump the water ahead of my boat out of the way, then I could use the outboard and surf down the slope too, but you will always spend more energy pumping the water out of the way than the boat will gain surfing the resulting wave.
"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek
RE: Wind turbine breakthrough or hogwash
RE: Wind turbine breakthrough or hogwash
Does read like hyperbole.
TTFN
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RE: Wind turbine breakthrough or hogwash
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: Wind turbine breakthrough or hogwash
"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek
RE: Wind turbine breakthrough or hogwash
TTFN
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RE: Wind turbine breakthrough or hogwash
Mike McCann
MMC Engineering
http://mmcengineering.tripod.com
RE: Wind turbine breakthrough or hogwash
"The assumptions made in this report include an
augmentation factor of 2 to account for the duct effect, no furling of the turbine, and a maximum
continuous generator output at 33% above the stated generator value. In general, it was observed
from the numerical estimations that the WindTamer turbine can produce approximately twice the
annual energy output for a given swept rotor area than a conventional open rotor design.
It should be noted that the numerically predicted design performance presented in this report is in
no way a guarantee of the final, full scale, real world performance."
Yes, I think I see what you did there.
Ducted fans always seem like an attractive idea, but in pure efficincy terms you are usually better off running a higher aspect ratio open rotor. However, efficiency is a bit of a daft concept when the input energy is sort of free, you are better off lookin at power output per dollar at a given windspeed, rather than worrying about Betz.
Cheers
Greg Locock
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RE: Wind turbine breakthrough or hogwash
Plus solar on the ground, but we get wind 24/7 and need power 24/7.
RE: Wind turbine breakthrough or hogwash
You need solar for days that the wind isn't working. You need batteries for when the sun isn't working and you want wind for when the sun isn't working. Best thing about solar is that generally it is on a reliable 12/12 schedule. Wind is not. If you optimize the percentage of each that you should build, including the reliability factor you need to back up what could be a considerable number of days that the wind isn't working, and the consequentially low optimized percentage that typically results when betting on having wind, and the batteries you need an all cases when none are working, it certainly won't be worth building the tower. In other words, the cost of wind vs the odds against having to count on it to deliver power reliably isn't all that good.
Unless you have an exceptional location, you would be doing very well indeed to get 20% of nameplate generating capacity out of it as an end of year average. Figures of 12 to 15% are more likely.
"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek
RE: Wind turbine breakthrough or hogwash
RE: Wind turbine breakthrough or hogwash
They don't need efficiency, especially if it costs more.
They just need a slow pump rate of water.
What they get is nearly free as it is.
Not even worried about the maximum amount of water they can pump.
Nothing to optimize there.
Really don't want a high efficiency, costly device that will be one more thing to break.
"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek