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Reworking the equation (was: Solar sham) - Page 2

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Posted by Mauried on February 14, 2008, 11:08 pm
 
On Thu, 14 Feb 2008 11:56:29 -0800, Bill Ward


Yes, thats the major question.
Why dont you see this.
The cost of solar panels is absolutely lowest at the point of
manufacture.
If its not economically viable to power solar cell plants from the
solar cells the plant makes, then when will it be , if ever.
One also has to look at the energy content that goes into making the
aluminium thats used to make the completed solar panel.



Posted by Morris Dovey on February 14, 2008, 10:27 pm
 
Mauried wrote:

Actually, I was thinking of using heliostats for melting Silicon.
If the bulk of the energy needed is heat, then it seems wasteful
to convert solar radiation to electricity - then convert it to
heat to do the job we want.


I think aluminum refining pretty much requires a high-current
electric smelter.

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto

Posted by J. Clarke on February 15, 2008, 1:17 am
 Morris Dovey wrote:

If all you need is to melt silicon then that would work, but you're
not just melting a material and pouring it into a mold, one way or
another you're making crystals, which requires relatively tight
process control.  Using electric furnaces gives you that
control--direct application of sunlight is going to hose up your
process every time a cloud goes over and is going to limit you to
batches that can be processed between the time in the morning that
your processing equipment comes to operating temperature and the time
in the evening when it cools belown operating temperature.


Nothing magic about aluminum, but the standard commercial process for
separating aluminum from the oxide is indeed electrolysis.

--
--
--John
to email, dial "usenet" and validate
(was jclarke at eye bee em dot net)



Posted by Morris Dovey on February 15, 2008, 1:59 am
 "J. Clarke" wrote:

I understand (I spent enough years in E.Fishkill to be somewhat
familiar with the requirements.) I would guess that what one
would heat with the heliostat might be a metal with an
appropriate melting point/heat capacity - then apply the heat as
needed either to pull cylinders/ribbons/sheets.

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto

Posted by J. Clarke on February 15, 2008, 3:32 am
 Morris Dovey wrote:

Pull?  Silicon is either grown and then sawn or is deposited in place.
There's no "pulling".

--
--
--John
to email, dial "usenet" and validate
(was jclarke at eye bee em dot net)



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