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Concentrated Solar Power?

Concentrated Solar Power? - Physics Forum

Concentrated Solar Power? - Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.


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  #1  
Old 06-11-2008, 08:33 PM
Doug Wedel
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Default Concentrated Solar Power?



Solar cells are relatively expensive while Fresnel lens are relatively
cheap. Using a Fresnel lens I can focus all the sunlight striking a, eg.
36" X 48" lens onto a single solar panel reaching as much as 4000F.

Could it be more cost-effective to use Fresnel lenses to concentrate
sunlight on solar panels rather than the traditional "unconcentrated"
approach? Does the output of a solar cell increase proportionally with the
concentration of sunlight?


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  #2  
Old 06-11-2008, 09:27 PM
dlzc
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Default Concentrated Solar Power?

Dear Doug Wedel:

On Jun 11, 1:33*pm, "Doug Wedel" <[Only registered users see links. ]> wrote:

Yes, with cautions. They are designed with "collector" busbars that
are designed for the currents expected of normal sunlight.
Additionally, "4000K" will cause permanent damage to the solar cells,
not the least of which is unsoldering connections and causing the
dopants in the semiconductors to migrate, and the cell to become
forever a block of useless material. So you will have a lot of waste
heat...


Potentially the current, yes. The voltage will not change.

Solar energy farms concentrate light incident on large areas to melt
some exotic metals, and the metals in turn make steam to run
turbines. Mirrors are easily adjusted for position, generally last
for years, and are not much more expensive than fresnel lenses (when
compared to equivalent areas of solar cells).

PVs just have the fact they make electricity direct going for them.
Really good for low maintenance applications, or low tech maintenance.

David A. Smith
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  #3  
Old 06-11-2008, 09:32 PM
Androcles
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Default Concentrated Solar Power?


"Doug Wedel" <[Only registered users see links. ]> wrote in message
news:[Only registered users see links. ] m...
| Solar cells are relatively expensive while Fresnel lens are relatively
| cheap. Using a Fresnel lens I can focus all the sunlight striking a, eg.
| 36" X 48" lens onto a single solar panel reaching as much as 4000F.
|
| Could it be more cost-effective to use Fresnel lenses to concentrate
| sunlight on solar panels rather than the traditional "unconcentrated"
| approach?

No.

| Does the output of a solar cell increase proportionally with the
| concentration of sunlight?

Yes. Every boy scout knows how to concentrate sunlight.
http://wildwoodsurvival.com/survival...ssfire1745.jpg


The problem is the sun moves across the sky as the Earth turns
and you have to move the lens with it, involving you with greater cost
and maintenance and offseting any cost savings you were hoping
to make.
Go ahead, put a lens in front of this:
[Only registered users see links. ]

Do you really think engineers have not heard of lenses, even Fresnel lenses,
and you are unique?


--
Why did Einstein say
the speed of light from A to B is c-v,
the speed of light from B to A is c+v,
the "time" each way is the same?

1/2[tau(A)+tau(A')]= tau(B)
where
A = (0,0,0,t)
A' =(0,0,0,t+x'/(c-v) +x'/(c+v))
B = (x',0,0,t+x'/(c-v))
x' = x-vt

Ref: http://www.fourmilab.ch/etexts/einst...ures/img22.gif

"Easy: he did NOT say that." - cretin [Only registered users see links. ]
According to moron van lintel, Einstein did not write the equation he wrote.
Androcles


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  #4  
Old 09-02-2012, 12:20 PM
Pipette Filler
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Default Re: Concentrated Solar Power?

Quote:
Originally Posted by Doug Wedel View Post
Solar cells are relatively expensive while Fresnel lens are relatively
cheap. Using a Fresnel lens I can focus all the sunlight striking a, eg.
36" X 48" lens onto a single solar panel reaching as much as 4000F.

Could it be more cost-effective to use Fresnel lenses to concentrate
sunlight on solar panels rather than the traditional "unconcentrated"
approach? Does the output of a solar cell increase proportionally with the
concentration of sunlight?
Solar cells are surely the future of energy sources. It is better to enhance their efficiency.
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