Talk:Ground-coupled heat exchanger
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What is the incendence of radon gas induction in earth cooling tubes? rkms
[edit] Design
The article states:
Smaller diameter tubes require more energy to move the air and have less Earth contact surface area.
I don't think so. What I presume this referrs to is the surface to volume ration per unit length -- a higher surface to volume ratio is a positive attribute.
So, we compare the circumference of the tube:
-
- 2*Pi*r
to the cross section area:
-
- Pi*r^2
So, while smaller tubes do require more energy to move the air but they have MORE Earth contact surface area per cross section area. That is the reason to use smaller tubes.
Tyrerj (talk) 04:20, 11 May 2008 (UTC)
