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Posted by News on June 12, 2008, 12:36 am
 


But will it work?  If so, it is a cheap way of improving the efficiency of a
such a heat pump system.


Posted by daestrom on June 6, 2008, 11:02 pm
 


No, from what I can see the hole is *in* the bedrock.  It looks like the
walls of the hole are rock face.  So he's embedding the concrete and coils
*into* rock, not just on top.

<snip>

Again, only if you have a similar soil situation.  Around my area, you can't
find bedrock that close to the surface.  You would need to dig quite a way
down to find substantial rock formation.  That changes the economics.

daestrom


Posted by News on June 6, 2008, 4:51 pm
 


I would have the plastic the pipe in a figure of 8, so it crosses right
through the concrete block.  As it is, it is wound around the outside of the
concrete block.




Posted by daestrom on June 6, 2008, 11:04 pm
 

If you're going to collect heat with conduction, wound around the outside is
the way to go.  If you're going to use it for intermittent storage, then the
figure 8 idea would be better.  Guess it all depends which way you think it
will work the best.

daestrom


Posted by nicksanspam on June 7, 2008, 6:24 pm
 

Coke in PET bottles has a 6-week shelf-life in a store, determined by loss
of CO2 pressure. Googling, I couldn't find a water vapor transmission rate
for PET bottles (in say lb/ft^2-h per "Hg of vapor pressure difference per
mil of wall thickness), nor their wall thickness. OTOH,

http://www.devicelink.com/mpb/archive/98/09/005.html

says 100 square inches of "low-density polyethylene" loses about 0.4 grams of
water per day per mil (0.001") of thickness at 40 C (104 F), with 0% RH on
one side and 35% on the other. A graph shows how this decreases linearly with
inverse (1000/T(K)) temperature...

Nick


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