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N5EBA
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Hobbies - HAM Radio - New Member

Join Date: May 2005
Posts: 56

Thermal Conductivity of Soil

12/17/2008 8:49 AM

Soil Thermal conductivity is very important to know when designing a system. I am doing my first ( about 10 tons) and have a question. I see the rule of thumb of one hole per ton at about 200-300ft or a horizontal installation of 400+ foot trench. How do you find the conductivity? Our Agronomist does not have any information. I see where there are some probes that go down 3 feet or so to measure conductivity but will the conductivity be the same down the hole? I would think not but I am no soils person. Anyone have a suggestions?
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editorgbanalysts
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Join Date: Jul 2008
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#1

Re: Thermal Conductivity of Soil

12/19/2008 4:19 PM

Your explanation of your project is not very clear so it is dificult to suggest answers to your concerns.

All the same, conductivity is measured measured across a specimen of a fixed width of soil. So the values should vary from place to place, depend on the porosity, wetness, clay & silicon concentration [variations] and presence of other minerals and substances. Most of these are all transitory with any soil of consideration.

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N5EBA
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#2
In reply to #1

Re: Thermal Conductivity of Soil

01/05/2009 10:17 AM

Short of drilling a hole and taking soil samples (which I would probably do if this was to be a large air conditioning system) the local air conditioning contractor that does this sort of work recommends a hole depth of 250 feet (one hole per ton) for this area. That is what I will go with. Thanks for your comment.
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