Quote:
Originally Posted by nibs
Thanks AC, had not thought of the heat transfer. Sand was suggested by a fellow from Alberta, where it gets really cold, his opinion was that the sand allowed some movement in the Pex as it heated and cooled, he had done a few churches that way. Seemed like a good idea & with 4" of foam under, I suspect the heat transfer losses would not be significant.
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"Thanks AC, had not thought of the heat transfer."
You are about to spend a lot of money and time working on a project that is specifically about thermal transfer, that you will live with for many years, and you have not thought about thermal transfer?
There is a problem here.
It looks like you did not look at the information I gave you. So I will make it easy... look at this:
From this source:
What is thermal conductivity for sand
Thermal Conductivity (W/m K) of
>Coarse SAND (dry) is 0.25 (W/m K)
>Medium SAND (dry) is 0.27 (W/m K)
>Fine SAND (dry) is 0.15 (W/m K)
From this source:
http://www.orbee.org/images/5cc-reso...-materials.pdf
Thermal Conductivity of concrete = 1.28 (W/m K)
This means that on average, concrete is almost
6 times better than dry sand at conducting heat.
In the long run it means that if you use sand, you will be paying more money to heat your house, every year, as long as you live there.
It is your floor, it is your money, it is your project.
-AC_Hacker