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-   -   A idea about geothermal heating & cooling (http://www.diychatroom.com/f17/idea-about-geothermal-heating-cooling-74195/)

deerhunter 06-20-2010 12:20 PM

A idea about geothermal heating & cooling
 
When I was thinking about heating & cooling options, I allowed my mind to wonder a little bit and came up with a some what crazy or may be laughable idea. What if I dig a well in the ground, pump up underground water and pour it over the outdoor unit of a heat pump. It's sort of like converting an air source heat pump into an open loop ground source one.

I'm think that this won't work, since nobody is doing this. But I'm kind of curious why it doesn't. May be low efficiency of heat exchange?

deerhunter 06-20-2010 12:28 PM

Right after I post this, I realized a serious problem with this design. Without any insulation and covering, the underground water will quickly cool down though heat exchange with environmental and evaporation. I guess that kills the efficiency.

beenthere 06-20-2010 01:09 PM

Not to mention that even at only 1.5 gallons per minute. The frozen ground in the winter won't be able to drain the water away. And would flood a large area. And turn it into an iceberg.

DangerMouse 06-20-2010 01:12 PM

Not a problem..... ring it and let it be an ice skating rink! Charge by the hour!

DM

beenthere 06-20-2010 01:16 PM

Hey. Put hand holds in it, and then rent time on it.


http://www.popgadget.net/images/iceberg.jpg

deerhunter 06-20-2010 01:17 PM

Yes. That's a problem. So it may work better in the summer. Evaporation will be on our side. I live in the south so I forgot about the icing problem.

Tom Struble 06-20-2010 01:18 PM

and what a waste of water

beenthere 06-20-2010 01:22 PM

Quote:

Originally Posted by deerhunter (Post 458967)
Yes. That's a problem. So it may work better in the summer. Evaporation will be on our side. I live in the south so I forgot about the icing problem.

How muddy of a yard do you want?

Does your crawlspace/basement eve get water in it, after several days of rain?

It probably will after the ground is soaked by the well water.

The water will probably have a fairly good mineral content. And will leave corrosion build up on the unit. And then insulate the coil from the water.

DangerMouse 06-20-2010 01:30 PM

Let it turn into a huge iceberg then, use it to cool in the summer as it melts!

DM

deerhunter 06-20-2010 01:33 PM

We mostly have slab here.

Actually, I think you may not be able to pump that much groundwater from a well. Because if else, I cannot see why people don't use groundwater on their lawn. Or is it simply because it's to expensive to dig a well and run the pump?


Quote:

Originally Posted by beenthere (Post 458973)
How muddy of a yard do you want?

Does your crawlspace/basement eve get water in it, after several days of rain?

It probably will after the ground is soaked by the well water.

The water will probably have a fairly good mineral content. And will leave corrosion build up on the unit. And then insulate the coil from the water.


DangerMouse 06-20-2010 01:33 PM

Thanks a lot for the pic in post 5 BT, my kid saw it and now he wants one..... and a pool to put it in....

DM

beenthere 06-20-2010 02:50 PM

Quote:

Originally Posted by DangerMouse (Post 458980)
Thanks a lot for the pic in post 5 BT, my kid saw it and now he wants one..... and a pool to put it in....

DM


LOL... You and him are both welcome.

Post video of him having fun. :laughing:

beenthere 06-20-2010 02:50 PM

Quote:

Originally Posted by deerhunter (Post 458979)
We mostly have slab here.

Actually, I think you may not be able to pump that much groundwater from a well. Because if else, I cannot see why people don't use groundwater on their lawn. Or is it simply because it's to expensive to dig a well and run the pump?

Its not allowed in many areas.

deerhunter 08-13-2010 12:59 PM

I think it's allowed in my area.

Is it possible at all to convert a air source heat pump to an open loop ground source one? I mean remodeling the outdoor unit so that instead groundwater is used to cooling/heating the coil instead of air?



Quote:

Originally Posted by beenthere (Post 459005)
Its not allowed in many areas.


beenthere 08-13-2010 03:11 PM

You'd need to buy the coaxial condenser for it. Do a lot of trial and error.


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