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Question about geothermal heating??

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Alvin NE WI

08-10-2001 18:13:59

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been reading some of the posts regarding gothermal heating--got a couple questions about it- #1 is how many feet of tubing do you need to bury ? Does it have to lay a certain distance apart from the other pipe? How deep does it have to be? Can you lay 3 or more tubes in a 2 foot wide trench? What size tubing to use? Any answers would be appericated.About 5 years ago I talked to a heating man about putting one of those in, he never showed up to give me some facts and figures. So i bought a Taylor outdoor furnace .. Thanks much. Alvin

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Mark Ross

05-01-2002 05:41:41

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Re: question about geothermal heating?? in reply to Alvin NE WI, 08-10-2001 18:13:59

You may want to see our website to answer questions about geothermal kits for the do it yourselfer. They start at about $6,500.00 and can be used for radiant floors as well. goto www.arit.com/produc3.html for more info

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Erik L. Berger

03-22-2002 18:34:13

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Re: question about geothermal heating?? in reply to Alvin NE WI, 08-10-2001 18:13:59

How much can I reduce my energy bill by connecting up a geothermal unit to my domestic hot water heater? I've heard that the compressor within the unit can heat the water essentially for free.

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Jhill

08-14-2001 09:59:06

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Re: question about geothermal heating?? in reply to Alvin NE WI, 08-10-2001 18:13:59

I have been looking at going closed loop with my heat pump. I have a 1400 sq ft house in Michigan. I was told I would need 1800 lineal ft, 10 ft down 6-8 loops in the same trench. It cost a bit up front but air conditioning last month was $18.00 and I heat last winter for $400. Sure beats the heck out of LP.

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Jerry B

08-11-2001 18:27:11

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Re: question about geothermal heating?? in reply to Alvin NE WI, 08-10-2001 18:13:59

I have heard of the "dry-tube" type of plumbing (the kind where air is circulated from the home/building, ect. into the piping underground and then forced back into the structure) collecting moisture and then setting up a bacteria filled pool of water that can cause sickness. Any truth to this? Just wondering

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Steve U.S. Alloys

08-12-2001 08:56:52

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Re: Re: question about geothermal heating?? in reply to Jerry B, 08-11-2001 18:27:11

That type of system can become a source for Legionaires desease Jerry. Any time air that is pumped directly into the living area from a basement or other source of damp space where bacteria can grow is dangerous to health as I understand it. The type that I am considering is a liquid filled closed loop system..

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VaTom

08-12-2001 11:41:05

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Re: Re: Re: question about geothermal heating?? in reply to Steve U.S. Alloys, 08-12-2001 08:56:52

Like Steve says, it can be a life-threatening situation if you reach dewpoint of your air. In extremely dry climates apparently hasn't killed off the proponents. Something I rejected for this climate and our underground house. Circulating a liquid through the pipes and then running it through a liquid/air heat exchanger (radiator) would solve the problem. Won't do what a heat pump will do but sure is a lot less expensive.

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Al English

08-11-2001 07:16:48

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Re: question about geothermal heating?? in reply to Alvin NE WI, 08-10-2001 18:13:59

Seasonal temperature variations in the earth are highest at the surface and typically become nearly constant at around 20 feet. The exact depth varies with location, soil type, and moisture. This temperature variation/depth change is not linear. The difference in seasonal temperature variation between 2 feet and 6 feet is pretty high, the difference between 6' and 8' is much smaller, the difference between 8' and 12' is even less, etc. Up to a point, the depth of the loop is a function of cost vs benefit. The shallowest depth I've seen specified is 5 feet. The difference in ground temperature fluctuation at 5 feet vs 8 feet is quite a bit. If you can do the digging yourself, can cash in some favors from a buddy, or just like using a shovel, the deeper you are able to bury the loop(within the limits described), the more efficient the heat pump will be. If you are paying full price for every bucket of dirt, go with the contractor's recommendation for your area. Good luck...Al English

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Neil

08-11-2001 07:06:05

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Re: question about geothermal heating?? in reply to Alvin NE WI, 08-10-2001 18:13:59

What is common is not so much geothermal heating, but rather a heat pump system using burried long tubes as the heat sink/source, instead of the traditional air heated/cooled coils.
I have hear numbers like 250 to 400 feet, but dont know how big of a system that was for.
Last I read on it people were using several vertical boarings or long trenches. Seems to me like a good way to go, since the groud is typically warmer then the air in the winter and cooler in the summer.

Do a yahoo search on;

+Ground +Sink +Heat +Pump

and you will get lots of links.

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Steve U.S. Alloys

08-11-2001 05:43:41

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Re: question about geothermal heating?? in reply to Alvin NE WI, 08-10-2001 18:13:59

Someone else probably knows way more about this subject than I do right now but I can answer a couple of your questions. In my preliminary meeting with a HVAC contractor he said you need 250' of tubing per ton placed 8' apart. I don't think they want to bury them together as the dirt needs to settle in around each tube before peak efficiency can be realized. You can drill a loop straight down of space is limited. You can also put the tubing in a well if the water level can be maintained sufficiently. The tube can even be placed in a pond if its deep enough and there is no concern of ever getting into it with a boat anchor or something. Pond placement would forego the price of trenching but someone else told me the sediment bulid-up would interfere with the tubing, insulating it from the water temps. Don't know about that for sure.

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