Hello Robin
First the best wishes for 2016
You are right that the high efficiency cells can be used for that purpose
but I think they also will perform most optimal at lower temperatures like
normal PV. To use them at 100 C or more
would bring down the efficiency, but to store heat it would be best to go
above 100 C.
So when you put them in the centre axis of the concentrator you would have
to cool them
down as possible, which would result in low grade heat.
Further these high efficiency cells are much more expensive to use in the
trough compared to normal PV`s
so probably it is cheaper and more efficient to use normal PV`s in the
trough and use the centre axis of the concentrator only
to get high grade heat.
That is my guess, but i am not 100% sure.
Peter
-----Oorspronkelijk bericht-----
From: [email protected]
Sent: Thursday, December 31, 2015 9:31 PM
To: [email protected]
Subject: Re: [Vo]:Re: Crescent Dunes Solar Energy Project
In reply to <[email protected]>'s message of Thu, 31 Dec 2015 12:26:56
+0100:
Hi Peter,
While true of normal solar cells, I seem to recall that there are also high
efficiency cells designed to be used with solar concentrators. I'm guessing
that
these will also function at boiling water temperatures. Is this not the
case?
Hello Robin
To store heat economically they can not use water heated by the
PV cells, bcs these cells have to be as cool as possible to work
efficiently.
By concentrating the rest of the direct sunlight on a thermal absorber
it is possible to get much higher temperatures to store heat effectively,
while keeping the
solar cells at a much lower temperature
Peter v Noorden
[snip]
Regards,
Robin van Spaandonk
http://rvanspaa.freehostia.com/project.html
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