That's quite high (for a closed loop system, anyway)...there was about a
$5k premium over a similarly efficient air/air heat pump which can be
hidden somewhat if the excating is all done when the house excation is
done rather than completely separately last I looked...
I think you have a false impression of the way a groundwater-exchange heat
pump works. You don't have to dig wells per se, you just have to bury the
heat exchanger deep enough that it's in the ground water. You don't move
the water to the heat pump, you move the refrigerant to the water.
Of course if the shallowest ground water is 2000 feet down . . .
Reply to jclarke at ae tee tee global dot net
In virtually any location it would be cheaper to dig the well... :)
There are <many> variations from fully closed loop in ground, bury the
loop in a lake, use one or two wells as source/reject water, simply put
the closed lood down a well bore...
I haven't looked recently but when researching prior to installing the
one I did, OSU (OK, not OH) had a very comprehensive site supporting
their research. TVA did at one time as well, but I think they've sorta'
finished the work they were doing...whether the site is still publicly
available or not I don't know...
Um, no, I don't have any false impressions!
There are many ways to get heat out of the ground!
One of the last ground source heat pump system I helped install had about a
dozen heat pumps, ranging in size from around 1-1/2 ton to 20 tons. Water
was run through closed loop wells, about twenty of them IIRC. The wells were
drilled to aproximatly 100 feet deep.
I set up a couple heat pumps in a home a couple of summers ago where there
was a water well drilled, again to about 100 feet deep. It was a "pump and
dump" system. All the water that passed through the heat pumps was dumped in
the ditch by the house and ran into the wet lands 1/4 mile away.
Before I showed up the company I worked for installed some ground source
heat pumps that had a refrigeration loop in the ground. We have not
installed any of these in years. They are still avilable, but seem to be
Pretty much all we see in this area, the water gets brought to the heat
pump, whether the water is a closed loop, pump and dump, or two wells, one
supply well, and one return well.
In some jurisdictions they are not legal due to enviromental impact.
The posibility of raising the ground water tempurature was what was
stated in the article I read a few years ago. Cost can be prety high
to. I read a while ago that there was a firm a few years ago that would
bury lots of copper about 10 ft down. Then just hook that up to the
compressor of the heat pump and it worked great. But the repair cost
got too high. If something punctured the pipe it was a goner.
Eeeeeeeeeee! Nine below? Just think, I moved down here as a geographic cure for
a marriage that had failed, and escaped that kind of weather, too. It did hit
five below here...IIRC, in 1985.
Thanks. I'll have the guy who's coming check the settings--and show me how to
recheck and reset--and I'll also make sure he gives the whole shooting match a
good going over. It has been in just over three years, so I don't foresee big
problems for another four or five.
I don't even know if we GOT a manual with this thing. I'll check around the
washing machine area (basement appliance manual files).
"It is when power is wedded to chronic fear that it becomes formidable." Eric
Thu, Dec 16, 2004, 5:17am (EST+5) email@example.com (Rick)
My wife and I bought a house <snip> OK with the idea of building a
garage 2x the above size 48'x24' <snip>
Sounds good, but you're using the wrong math. Figure 2X the size
Ask any question you please of the Gods. They do not have to answer.
- Ko'a Orto'o, Gnomic Utterances, II xvi
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