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A 100% passive solar heated bungalow - Page 3

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Posted by daestrom on March 5, 2004, 2:09 pm

And in heat-transfer and fluid flow engineering it's known as "natural
convection".  :-)


Posted by ~^Johnny^~ on March 4, 2004, 7:08 am
On 23 Feb 2004 08:00:30 -0500, nicksanspam@ece.villanova.edu wrote:

Heat does not rise.  
But warm air does,  
and carries heat with it.  :-)


Correct.  (I believe)
But then,  we have stratification with which to deal.
We need a solution.
Can you say "ceiling fan"?   <g>

            wide-open at throttle dot info

A little knowledge that acts is worth infinitely
more than much knowledge that is idle. -Kahlil Gibran

Posted by Sonideft on February 22, 2004, 3:13 am
 Have you considered using a large water tank for heat storage, say 6000
gallons or so. They are easier to get heat in and out of than air through
rock. I also heard that the air/rock storage arrangements were prone to mold
and other health problems. Having the heat storage directly below the
bungalow sounds like a great idea. I have worked with a seasonal heat
storage design in Peterborough, Ontario and 6000 gallons seemed to work out

Stephen Cumminger
Sonideft Solar
Email: stephen.cumminger@heatwithsolar.com

Posted by David Delaney on February 22, 2004, 5:51 am
 On Sun, 22 Feb 2004 03:13:18 GMT, "Sonideft"

Nope. That would mean I'd have to have either an
air-water heat exchanger, or a pipe-and-plate
solar water heater.  If I have a pipe-and-plate
water heater, I have to give up my ventilation
scheme. I'd have plumbing, the possibility of
leaking plumbing, an electric pump or a specially
designed thermosyphon solar water heater, and
anti-freeze or automatic drain-back.
Far too many complexities. 6000 gallons is about
23 tonnes, so its still a lot of weight for the
attic. I really get a lot for biting the bullet
and putting 40 tonnes above the living space.

Not if the rock has enough surface area.

No mold if they are only used for heating, since
they are always well above the dew point of the
air in contact with them. I will probably have to
seal the concrete blocks, though, to be confident
of no concrete dust.

Yes, For example, Saunders's designs for combining
heat storage and radiant floor heating are
beautiful. But it won't do for my purposes,
because I'd then be dependent on fans or pumps to
get the heat from the collector down to the heat
store--remember that I don't want to be dependent
on *any* electricity for basic space heat.

David Delaney, Ottawa

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