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Heat Storage for Passive Air-Heating Panel - Page 3

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Posted by Morris Dovey on December 21, 2007, 8:10 pm
 
EricY wrote:
|| I expect heat to accumulate fairly rapidly in this shortened path.
|| How rapidly it will transfer through the barrels to the storage
|| fluid remains to be seen.
||
|
| I like where this experiment is going.  In order to see if the heat
| transfer rate is sufficient to make this all worthwhile I'd do a
| very small scale experiment.  Maybe something as simple as a hair
| dryer and several cans filled with water with temp sensors to see
| how quickly they heat up.  As long as the materials, surface area
| to volume ratio, and temp/air flow rate is close to the real life
| version I would think you could at least get a good idea of how
| well this would work.
|
| I'm really interested in seeing how well this works.  I've got a
| solar hot water setup here that I use to heat a concrete slab in my
| shop.  I've wondered how quickly an uninsulated 55 gal drum with
| hot water would come to equilibrium with the ambient temperature.
| I know that my poorly insulated drainback tank takes days to cool
| down to the ambient room temp when there isn't any sun.

Ideally, I'd be able to move the heat into storage very rapidly and
then pull it out fairly slowly. I expect to achieve only the latter -
but suspect that I'll be able to deposit a respectable surplus of heat
over a period of a week or so, even if I do withdraw some heat every
night.

I'll probably test with the real deal - which I'd need to do anyway. I
plan to post photos and data on my seb site when the testing is
complete.

The only sure thing is that the experiment _will_ be a success - I'll
know more when it's done than I do now. :-)

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto/



Posted by nicksanspam on December 21, 2007, 9:06 pm
 
 

You might have 2 thermal masses, a "high-bandwidth" low-mass overnight
store with a large daily temp swing and a high surface-to-volume ratio,
(eg some shallow water trays under a ceiling) and a larger mass with
a smaller S/A ratio (eg some 55 gallon drums) that's trickle-charged
on an average day and fully discharges over a week.

Nick


Posted by Morris Dovey on December 21, 2007, 10:33 pm
 nicksanspam@ece.villanova.edu wrote:
|
|| Ideally, I'd be able to move the heat into storage very rapidly and
|| then pull it out fairly slowly...
|
| You might have 2 thermal masses, a "high-bandwidth" low-mass
| overnight store with a large daily temp swing and a high
| surface-to-volume ratio, (eg some shallow water trays under a
| ceiling) and a larger mass with
| a smaller S/A ratio (eg some 55 gallon drums) that's trickle-charged
| on an average day and fully discharges over a week.
|
| Nick

Great minds thinking alike <g> - I thought about adding a row of
"jerry cans" or, possibly, 25-gallon drums for quick store - and may
yet give one or both a try. For the initial test, tho, I think I'll
try a single row (not stacked) of 55-gallon drums elevated so that the
tops are just under the closet lid.

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto/



Posted by Morris Dovey on December 22, 2007, 7:32 pm
 Morris Dovey wrote:

| For the initial test, tho, I think I'll
| try a single row (not stacked) of 55-gallon drums elevated so that
| the tops are just under the closet lid.

Woke up in the middle of the night and decided to try sneaking up on a
construction drawing. Everything shown is more or less to scale...

http://www.iedu.com/DeSoto/Projects/ThermStore/ThermStore2.jpg

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto/



Posted by sno on December 21, 2007, 10:38 pm
 

nicksanspam@ece.villanova.edu wrote:

You can do that with barrels if you use a trickle collector...use
epoxied hose between individual barrels to connect them...and a
small pump to circulate water....extract heat as you are presently
planning....

thanks for listening to my thoughts...have fun.....sno


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