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Geothermal Cooling - Page 3

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Posted by daestrom on May 11, 2008, 4:23 pm

Quite right.  One application I've seen in industry is 'reclaimers' for
cryogenic storage tanks.  A small Stirling cycle machine, driven by an
electric motor is used to re-liquify the gas.


Posted by Kitep on May 11, 2008, 6:21 pm


Still on my to-learn list.  I did watch a nice little you-tube video the
other day, which showed a solar powered stirling engine cranking away.  I
didn't realize they could produce freezing temperatures themselves.

The thing that bothers me though, is that if this was a good way to go, why
does it seem like no one's doing it?  When I google solar cooling, it's all
about evaporative cooling (no good in my humid town), with some "earth
tubes" thrown in too.  Maybe it's because stirling engines are buried in
reference 8349...

Posted by Morris Dovey on May 11, 2008, 6:42 pm
 Kitep wrote:

Yuppers - these are fascinating devices. The Stirling cycle is
reversible: If you provide the engine with a temperature differential,
it'll produce mechanical energy. If you provide it with mechanical
energy, it'll produce a temperature differential.

Fulton's "Claremont" was /almost/ fitted with a Stirling engine, but it
would seem that engineers consider Stirlings a bit magical for their
liking. I'm not an engineer, but I like things that /work/ and I don't
mind getting my hands dirty.

People don't change established patterns until their pain threshold has
been sufficiently exceeded...

(perhaps $50/bbl?)

...and at that point I'd expect much more widespread use of the
technology. :-)

Morris Dovey
DeSoto Solar
DeSoto, Iowa USA

Posted by Kitep on May 11, 2008, 7:02 pm

So very very true.

Posted by Kitep on May 11, 2008, 6:15 pm

In the article I read, the dehumidifying was one of the selling points.  In
my town, "hot & humid" is basically one word :)  The article did mention
that you don't want water to puddle several times, and made it clear that
for a horizontal air tube you should make sure it slopes downward in the
direction of airflow.  That way, the water won't puddle, and the air helps
to push it along.  You would collect the water in a bucket/drain where the
return tube enters the house.

Though the more this group responds, the better a closed system sounds.

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