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Photovoltaic + solar thermal

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Posted by Dave McMahon on September 1, 2003, 10:12 pm
Could a P.V system be put on top of a thermal system (doing two things at

Posted by Nick Pine on September 1, 2003, 11:48 pm

Better the other way round, with water in poly film ducts on top of PVs,
under a linear parabolic downward reflector with 2:1 concentration.


Posted by Steve O'Hara-Smith on September 2, 2003, 5:22 am
 On Mon, 1 Sep 2003 22:12:01 +0000 (UTC)

DM> Could a P.V system be put on top of a thermal system (doing two things
DM> at once?)

    As near as I can make out with CPV you pretty much have to because
CPV cells require cooling, it would seem crazy to throw away the thermal
energy in that coolant.

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Posted by Anthony Matonak on September 2, 2003, 4:53 pm
 Dave McMahon wrote:

Yes, and I believe there is actually one or two companies (one in
Germany, I think) that make such panels. I know there was a fellow
around that was holding workshops on how to build such combined
panels for use in concentrating systems.

Generally it's not done because it adds complexity and that means
there is one more thing that can go wrong. Also electricity and
heat requirements of most places are vastly different. It's much
cheaper to simply have two sets of panels as the main problem is
cost and not real estate. That is, a typical house can have all
it's electrical needs (minus cooking) provided by covering less
than half it's roof with PV's and all it's hot water needs with
less than 10% of it's roof area.


Posted by Nick Pine on September 2, 2003, 11:27 pm

Rich Komp, sunwatt@juno.com

You might want to re-examine that article of faith.

Got any numbers to back this up?


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