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We've all seen how gargantuan the windmills on wind farms are. The blades on these things are huge. Aside from initial cost (seeing as how these things pay for themselves over time, approx. 8 years), why not mount arrays of solar panels on the blades themselves?
*Each blade is usually between 20 and
40m long. That's plenty of room to add panels. Why not make the surface of the blades into solar panels to begin with?
It would take some engineering, but the added efficiency might be worth it.
*The rotation of the turbine into the wind is computer controlled and could turn the blades into the sun during times of no/low wind.
*If the panels cannot be put mounted on the outside(perhaps an unacceptable increase in drag), the blades could be made clear and the panels mounted inside.
Laddermill
http://www.ockels.nl/
If you take them high enough you could get above the clouds and enjoy permanent sunlight. [django, Aug 08 2007]
Crooke's Radiometer
http://www.physics....rmo/demo/4d2010.htm
Generating thrust from solar energy [Wrongfellow, Aug 14 2007]
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Annotation:
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Panels operate poorly when their face is not close to perpendicular to incoming light. |
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//Panels operate poorly when their face is not close to perpendicular to incoming light//
You could use mirrors and prisms to channel light onto the blades which contain solar panels. |
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My biggest worry are the wires. Every solar panel I've ever seen has wires for the output. They will get wound up around the turbine's shaft. I presume you'd have to reverse the blade pitch half the time so it would run backwards and unwind• |
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//My biggest worry are the wires// |
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Slip rings would be one way to solve this problem. |
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Alternatively, since this is the halfbakery, each turbine blade could have a small motorised propeller mounted at its tip.
Energy from the solar panels would turn this propeller, pushing the turbine in its preferred direction of rotation and getting converted back into electricity by the main generator. |
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This could actually work with wind-power systems based on kites [check link]. As long as they're thin film photovoltaics. |
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Oh cool, I like the Laddermill. |
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I like this idea because with current silicon
PV's, heat reduces the efficiency. Having
them mounted onto turbine blades will
allow them to be cooled, increasing their
efficiency. |
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But then having them on turbine blades
also causes them to lose out on half of the
daytime sunlight. |
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Hmmm. I'm actually kind of taken with that idea that the solar cells drive a propeller. It was silly, but it leads onto ideas that might actually work. |
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If there was some way to generate extra thrust from solar energy (but not necessarily solar cells) then this could be really good. |
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I'm thinking more about making the blades out of some material than heats up in the sun and in some way (no idea how, this is the bakery remember) gets a jet of air moving. I'm sure there were some ideas on this using something called thermoacoustic power. |
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Probably it won't work, but maybe it will?? Thermoacoustic power sounds like the kind of thing you guys dig here at the bakery. Take it away... |
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You can generate a tiny bit of thrust from solar energy using a Crooke's radiometer (see link). |
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The idea of scaling this up to generate power seems suitably half-baked to me! |
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