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Old 01/08/2008, 04:54 PM   #1
achillesheel
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underground cooling

can anybody point me to somewhere that may have diagrams for underground cooling methods.

i have a 600 total gallons and a 1/2 hp chiller and need help with my power bill. my return line is 1.5" and runs about 80 lineal feet underground. my temp runs around 82-83 during the summer and my chiller runs more than it doesn't so any thing that might help.

looking to get this done during this winter or spring

thank you
shad


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Old 01/08/2008, 05:06 PM   #2
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What exactly are you looking for? A pic showing the concept or a details on how to do it yourself?


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Old 01/08/2008, 05:08 PM   #3
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http://www.dougrye.com/geothermal.html

A google search on Geothermal heat exchanger brought a bunch of hits.


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Old 01/08/2008, 05:16 PM   #4
achillesheel
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Quote:
Originally posted by Darroll
What exactly are you looking for? A pic showing the concept or a details on how to do it yourself?
both but more for aquarium use.

i've seen plenty of talk and descriptions of systems but i need something to push me in the right direction and can't seem find anything with diagrams. yea, i need pictures.


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Old 01/08/2008, 05:27 PM   #5
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There are two basic methods;

1. Run tank water through an underground loop with a pump that is controlled by a thermostat.

2. Run a glycol solution through a closed underground loop that also has a heat exchanger to transfer the heat from the tank water.

Option 2 is slightly more complicated but better due to the elimination of possible stagnant tank water from the loop.


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Old 01/08/2008, 05:28 PM   #6
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I saw someone use an underground cooler like what your talking about but only on an outside fresh water tank.


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Old 01/08/2008, 05:36 PM   #7
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acrosteve- #2 is what i believe im looking for. but i thought it was using fresh water. any links

the new totm uses something but i need some direction. and again diagrams please.


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Old 01/08/2008, 07:33 PM   #8
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A glycol solution is basically water and antifreeze of some sort. It would also work to inhibit growth of unwanted stuff in the loop.

Sorry, no links.


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Old 01/08/2008, 08:29 PM   #9
achillesheel
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aarghhh!!!!!!


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Old 01/09/2008, 09:18 AM   #10
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I'm not sure why you need pictures? It's pretty straight forward. Run some pipe under the frost line in your yard.... Slap on a HEX, ranco temp controller, and a pump and wala! done


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Old 01/09/2008, 10:11 AM   #11
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all threads need pictures


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Old 01/09/2008, 10:35 AM   #12
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Here's some RC links on geo thermal cooling (last on has pictures)

http://reefcentral.com/forums/showth...hreadid=840592

http://reefcentral.com/forums/showth...hreadid=836449

http://reefcentral.com/forums/showth...hreadid=832370

http://reefcentral.com/forums/showth...hreadid=817756


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Old 01/09/2008, 02:39 PM   #13
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I would think creating a network of pipe under the ground would help ncrease surface area. T off into a web under ground.


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Old 01/09/2008, 02:56 PM   #14
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What kind of pipe would you use?


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Old 01/09/2008, 05:05 PM   #15
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Quote:
Originally posted by Malifluous
I would think creating a network of pipe under the ground would help ncrease surface area. T off into a web under ground.
The tees are potential places for leaks. You'll get better heat transfer if you use a single continuous uniformly flowing pipe/tube. As you would tee off flow rate would go down. If it doesn't flow at all in a section, then it wouldn't be doing you any good.

Jason


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Old 01/09/2008, 05:51 PM   #16
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here is everything i know about heat exchanging..

http://www.tpub.com/content/et/14093/


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Old 01/09/2008, 06:48 PM   #17
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there's a section about doing this sort of thing in the 3rd volume of Delbeek and Sprung's Reef Aquarium series. they used a series of vertically oriented pipes-in-pipes. that way you could get the work done with a posthole digger instead of a trencher.


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Old 01/09/2008, 09:17 PM   #18
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There is not enough surface area in a "post hole" to act as heat sink. The earth is a very good insulator.


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