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Interior Radiant Mass Wall Design-Seeking Feedback - Page 2

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Posted by d on June 4, 2006, 10:47 pm

You're right that the height of each pour would be limited by the strength
of the forms.  This could be overcome by doing multiple pours(one on top of
the other), or by strenthening the forms.  The strength of drywall forms
could be much improved by adding 1x4 strapping to the outside and screwing
through into the studs, then removing the strapping and replacing screws
after setting.

That is an interesting idea... incorporating thermal storage and a possibly
controlable heat delivery system.     Could recycled plastic water/pop
bottles be used when filling the cavity, they're free?

On that note is there a cost effective phase change material that would be
inert in a plastic bottles or PVC cylinders?

Perhaps a cob blob embedded with bottles of water or PCM, and a hydronic or
air(ag pipe) coil for delivery and distribution.  Maybe we could all replace
our furnaces with one... 3'x5'x8'0ft^3 of mass or at least 3000BTU/F.
Would that make a good heat capacitor if tied to your solar collector Nick?


Posted by News on June 2, 2006, 3:01 pm

Murphy's Law come in here.  Someone will ram a nail in the wall and hit
water pipe - they will.

As you have a basement, put the thermal mass in the floor between the
basement and floor above (ground floor).  Then install underfloor heating in
that.  Best have masonry tiles on the floor for the room air to access the
floor thermal mass.

You could put in an air-core floor using cheap hollow concrete blocks as
James Kachadorian did.  Each masonry duct can have a floor grill at each end
at the edges of the room.  Hydronic pipe could be in the floor screed and
any heat conducting downwards will promote warm air currents in the ductwork
and convection in the room above.  Or have the pipes in the masonry ducts,
then more responsive heating with hotter air currents, and a warm floor too.

This all depends on how easy it is to fit this floor in your house.

Posted by Redigoogle on June 2, 2006, 3:21 pm
 I'm looking at a 1981 book, Home Solar Gardening, in which the author
John Pierce discusses heat storage materials and mentions  hydrates
salts, zeolite, natural clay and calcium cloride hexahydrate.

So I think this fits into this thread, and I'm wondering if other
respondends have experience or comments on these alternative materials?


Posted by News on June 3, 2006, 2:47 pm

Dense concrete has very good emissivity.

Posted by d on June 2, 2006, 10:11 pm
 In my case, any infloor heating would lose considerable heat to the water
table below (which is quite high), and there isn't enough height to build up
the floor with insulation, screeds, or blocks, although that design is
interesting.  I think that many existing basements would share similar
problems, hence the reasoning behind my proposed design.

Definitely gotta watch those punctures though!





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