How big are wind turbines getting?

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How big are wind turbines getting?

#1  Postby Macdoc » Oct 06, 2017 9:38 pm

This is a single blade ...

Having just survived Scottish roads ..count me impressed,,,

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Re: How big are wind turbines getting?

#2  Postby CdesignProponentsist » Oct 06, 2017 10:54 pm

I believe there is an upper limit to the size and we're close to it already where efficiency is lost with larger blades. Don't remember where I heard this though.
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Re: How big are wind turbines getting?

#3  Postby I'm With Stupid » Oct 07, 2017 12:29 am

I've never really understood how these massive wind turbines work. How fast to they actually spin?
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Re: How big are wind turbines getting?

#4  Postby Animavore » Oct 07, 2017 4:58 am

I'm With Stupid wrote:I've never really understood how these massive wind turbines work. How fast to they actually spin?

As fast as the wind.




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Re: How big are wind turbines getting?

#5  Postby crank » Oct 07, 2017 8:04 am

There is something about number of bird kills if they spin too fast. And there is a simple relationship with tip speed to rotation rate and radius. The tips can't go supersonic, so if the blades get really long, they're going to have to go fairly slow rotation-wise.

None of these huge turbines could withstand the hot-air movement coming out of the oval office.
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Re: How big are wind turbines getting?

#6  Postby aban57 » Oct 09, 2017 9:01 am

I've seen a couple videos of these amazing drivers, in roads so tiny I would struggle with my car. It's amazing what they can do with such a long load.
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Re: How big are wind turbines getting?

#7  Postby Macdoc » Oct 09, 2017 10:22 am

The turbines look small in the landscape ( this was Orkney's who are self sufficient in green power ) -

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Then you see the parts - as on that truck and here, part d a tower being towed by us off he German coast and realzed that's serious size engineering/fabrication

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I was doubtful about wind power ...not anymore.
Apparently out at sea in the Swedish archipelago, and yet dozens of giant towers along the horizon....awesome and inspring sight.If you look carefully ....there is another bank of turbines far off to the left.

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Re: How big are wind turbines getting?

#8  Postby Tero » Oct 09, 2017 1:02 pm

Vertical axis turbines have no height limit other than how tall you can build it. However, not sure how you would arrange to get more power in the actual generator with more height
https://en.wikipedia.org/wiki/Vertical_ ... nd_turbine
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Re: How big are wind turbines getting?

#9  Postby Macdoc » Oct 09, 2017 2:10 pm

Well the blades on the biggest ( 9 MW? ) are longest and provide higher power ....I do think the supersonic issue is the major limit for gain tho.
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Re: How big are wind turbines getting?

#10  Postby zulumoose » Oct 09, 2017 2:15 pm

The scale on these things is just staggering, plenty of Youtube videos of construction and assembly, and some spectacular failures when the brakes fail to control them in high winds. Note the man walking along the front of the building.

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Re: How big are wind turbines getting?

#11  Postby Macdoc » Oct 09, 2017 10:18 pm

Hasn't stopped either


World’s Largest Wind Turbine Would Be Taller Than the Empire State Building
Massive, flexible blades would bend with storm winds like the palm trees that inspired them
By Annie Sneed on June 26, 2017

Wind energy is soaring in the U.S.; the nation’s renewable energy capacity has more than tripled in the past nine years, and wind and solar power are largely responsible. Now businesses want to harness even more wind energy, at a cheaper price—and one of the best ways to lower cost is to build bigger turbines. That’s why an alliance of six institutions led by researchers at the University of Virginia are designing the world’s largest wind turbine at 500 meters tall—almost a third of a mile high, and about 57 meters taller than the Empire State Building.
Turbines are already noticeably larger than they were 15 or 20 years ago. Size varies, but today’s typical wind farm towers stand around 70 meters tall, with blades about 50 meters long. Their power output depends on size and height, but it generally ranges between one and five megawatts—on the upper end, that’s enough to power about 1,100 homes. “There's this motivation to go to larger wind turbines, and the reason is pretty much economics,” explains John Hall, an assistant professor of mechanical and aerospace engineering at the University at Buffalo, S.U.N.Y. One reason giant turbines are more cost-effective is that wind blows stronger and more steadily at greater altitudes. Thus, “you capture more energy” with a taller structure, says Eric Loth, project leader of the massive turbine project, which is funded by the U.S. Department of Energy’s Advanced Research Projects Agency–Energy (ARPA–E).


more

https://www.scientificamerican.com/arti ... -building/

Here is some scale for you

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Some one asked about "speed"...

Wind Energy Facts — Wind Power & Wind Turbine Facts
https://cleantechnica.com/.../wind-ener ... ine-facts/
Aug 13, 2017 - The tips of the largest wind turbine blades can reach heights up to 200 m (650 ft). Speed at the tip can reach over 320 km/h (200 mph). A wind turbine has as ...
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