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External thermal mass idea. Cool idea need help

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Posted by Saki on November 8, 2009, 8:13 am
This my idea, I have search the internet and can't find where someone
has done this. I am building a new house with radiant floor heat. It
is a 2000 sq ft concrete slab 4 inchs thick. It will be insulated
under the slab. I want to build and external slab also insulated 4
inchs under and around the slab that will have 2 layers of clear
corigated fiberglass cover (double pane window). The top of the
external slab will be painted black to attract the heat from the sun
(Greenhouse effect). Store the heat in the external that will have the
tubing built in so I can curculate water between the two slabs. I was
going to make it about 8 x 16 foot. How thick can the external slab
be? If I make it 2 ft thick will the heat penatrate 2 ft or is that
over kill. I want to use it as and external thermal mass battery or
make it 6 inchs thick and use it as an external solar generator.

Posted by Saki on November 8, 2009, 8:13 am

Thank you, I posted there!

Posted by Morris Dovey on November 8, 2009, 10:19 am
 Saki wrote:

In my part of the USA, it would be expensive with poor return on
investment. It sounds like a very inefficient collector with lossy
storage. I think your MTD approach would produce better results.

Morris Dovey
DeSoto Solar
DeSoto, Iowa USA

Posted by Josepi on November 8, 2009, 3:15 pm
 Usually a large tank of water in the ground with insulation is easier to
manage for thermal storage. Just need insulated piping and pumps.

Facilities have to be made for cleaning the sludge out of the bottom of the
tank every ten or twenty years, though. A septic tank with insulation may be
just the ticket. It has cleaning ports and can stand up to traffic above it,
buryable and holds about 1000 gallons or more, hooks for lifting it into

Posted by News on January 30, 2010, 3:22 pm

Look at a hypocaust floor. Katchadorian made these do a Google. You are on
about a Trombe wall laid flat.  Insulation has to be like a tray.

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