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Combined heat and power - a new twist

 
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PS_RalphW



Joined: 24 Nov 2005
Posts: 5267
Location: Cambridge

PostPosted: Thu Aug 08, 2013 4:06 pm    Post subject: Combined heat and power - a new twist Reply with quote

http://www.newformenergy.com/news/newform-energys-4-panel-kits

For the space limited this looks like a very good product - especially the double financial incentive (and on my listed building triple incentive).

My attitude is that a little electricity is a lot better than none at all.
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adam2
Site Admin


Joined: 02 Jul 2007
Posts: 6222
Location: North Somerset

PostPosted: Fri Nov 08, 2013 9:40 am    Post subject: Reply with quote

Possibly worth considering, but similar products have not enjoyed much success previously.

To produce hot water at temperatures suitable for domestic use, the solar thermal collectors need to get reasonably hot, 45 degrees is probably the minimum, and 65 degrees would be better.

To produce electricity in reasonable qaunities, PV modules need to be as cool as possible.

Therefore any attempt to combine the two will result in low electrical generation efficiency, or lower than optimum hot water temperatures.

For very large scale installations, it has been proposed to cool PV modules with cold well water, thereby increasing electricity production.
The well water would be only slightly warmed thereby and would have to be furthur heated via purpose designed solar thermal collectors before use.
It seems unlikely that such complexity could be justified for small installations.
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