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Old 09-25-2008, 11:23 AM   #1
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Simplest Geothermal setup question


I'm very new to this subject, just saw it on Discovery a few weeks ago. And I'm not at all technical, so when I went through some of the posts here on this subject, I only understand a few %.

This is my situation:

I have a piece of land where I keep tortoises and I need to keep them warm in the winter. Winter here gets down to 40 to 45, and I want to raise the temp up to around 60-65. I only need to keep a space of about 100 square feet warm.

Is there any way for me to DIY a very simple geothermal system, either using air and fan or water with pump? I'm afraid of the high pressure stuff.

However, I do have second hand fridge and window a/c units. Is there a simple way to use them?

Thanks very much.

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Old 09-30-2008, 01:26 PM   #2
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Simplest Geothermal setup question


Not sure where you get the air conditioner part if you want to heat the land.

But here is the solution.

Dig down about 6 inches, bury a 1000 foot roll of 3/8 pex with no connections (they are not rated for underground). Connect this up to a water heater and a small pump (something like a Taco here http://www.pexsupply.com/product_dtl...d=Taco&cID=291 ) for circulation and you are good to go.

If you really want to get fancy you can put a thermostat on the ground that will turn on the pump when it gets too cold and will save you energy.

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Old 10-01-2008, 11:14 AM   #3
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I'm in Hong Kong and it's hard to find these things here. Can anyone tell me what kind of tube I can use? I mean, what material and thickness. I'll try to find some thing similar here.

Thanks.
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Old 10-01-2008, 11:29 AM   #4
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Simplest Geothermal setup question


Quote:
Originally Posted by tchan View Post
I'm in Hong Kong and it's hard to find these things here. Can anyone tell me what kind of tube I can use? I mean, what material and thickness. I'll try to find some thing similar here.

Thanks.
Irrigation pipe works as will almost any poly pipe. As long as it is rated for pressure. No connections underground are allowed. They will rust off over time.

Copper also works very well but is rather expensive these days.

I have heard of people using CPVC but the heat transfer rates are slower.

If you look hard enough you can find pex in Hong Kong. Poly pipe has been used in Europe for over 20 years and is finally getting to America. We seem to be the last to get some of this stuff. I can't imagine that pex is not popular in Hong Kong. It might be under a different name. Just look around for poly water pipe.
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Old 10-02-2008, 10:37 AM   #5
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Simplest Geothermal setup question


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Originally Posted by Marvin Gardens View Post
.

If you look hard enough you can find pex in Hong Kong. Poly pipe has been used in Europe for over 20 years and is finally getting to America. We seem to be the last to get some of this stuff. I can't imagine that pex is not popular in Hong Kong. It might be under a different name. Just look around for poly water pipe.
Is there a full name for PEX?
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Old 10-02-2008, 10:47 AM   #6
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Is there a full name for PEX?
Pex is a polyethylene cross linked pipe used for lots of stuff.

http://en.wikipedia.org/wiki/PEX

It's very popular world wide and used for tons of stuff.

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