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Concrete slab on ground as a solar thermal source

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Posted by Sundog on October 18, 2003, 11:14 pm
If a dark coloured concrete slab spends, say 6 hours/day in direct sunshine,
and has an insulating slab - say R 10 - under it, would it be a good source
of energy for underfloor heating of a house? What I have in mind is water
circulating through a tube embedded in the slab and into the house.

A similar source would be a concrete deck over a garage.

Anyone know of a computer prog, especially a freebee, that could look at
various optimizations of such situations?



Posted by SQLit on October 18, 2003, 11:40 pm


Interesting idea. All of the in-floor systems I have seen are used with
boilers. My GUESS is that the temps would not be high enough to transfer
from one slab to the other. The delta T (difference) would not be great
enough. I have always wondered why pools were not heated or supplementally
heated this way.

I will be watching for the experts

Posted by Boner the Cat on October 19, 2003, 1:54 pm
 why not build an underground cistern, in a highly insulated concrete box and
heat water to 180 with solar trough.


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