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Why not photovoltaic trough?

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Posted by Ed Ferris on July 21, 2008, 1:30 am
 
This may be a dumb question, but:  Why not use parabolic mirror troughs, as
in solar thermal systems, with a narrow strip of photovoltaic cell at the
focus?  Seems it would be a lot cheaper.

Posted by Ralph on July 21, 2008, 10:25 am
 
they don't like heat.
- and it's not a dumb question.

"Ed Ferris" <none> wrote in message


Posted by coj on July 21, 2008, 11:08 am
 Ralph wrote:

There are some solar pv concentrating troughs in existence, one such was
the Euclides project

http://www.pvresources.com/en/euclides.php
http://www.inspira.es/newsroom/981130.html

Solar concentration from this sort of arrangement could be 20-30x but as
  Ralph mentioned the heat build up meant that heat sinks had to be
used. Plus you had to add the cost of the solar tracker and support.

Most ordinary cell and module designs aren't good at high concentration
due to the higher temperatures and the I^2R loss from high currents,
these cells used laser grooved buried contacts (narrower than screen
printed lines) for the ability to have more fingers with low shading loss.



--
coj

Posted by =?iso-8859-1?Q?Roland_M=F6sl?= on July 21, 2008, 11:16 am
 "Ed Ferris" <none> schrieb im Newsbeitrag

Silicon based photovoltaic looses 0,48% efficiency at
ever degree Celsius more warm.

Concentrators are tested, here from Sharp
http://live.pege.org/2006-intersolar/sharp-concentrating-cell.htm

They are more for very sunny areas.

I live for example in Austria.
In winter, 60% of irradiation is diffuse,
diffuse light can not be concentrated.

New cheap thin film technics make concentration obsolete
http://live.pege.org/2008-intersolar/photovoltaic-factories.htm


--
Roland Msl
http://car.pege.org  cars and traffic
http://live.pege.org  building and live
http://www.pege.org



Posted by mike on July 27, 2008, 11:19 am
 Roland Msl wrote:

This is counter-intuitive.  Thought experiments with
arbitrarily large parabolic reflectors and arbitrarily small
solar cells suggests that there should be non-zero improvement????


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