R Scott wrote:Concrete is used as mass in lots of passive solar designs.
But there are benefits to vented tubes through the soil that are hard to quantify. How does the air exchange below the root level change the soil biology and plant growth? How does the phase change of water condensing in the pipes AND vaporizing (which the concrete can't do) increase heat transfer?
I don't know the answer, they are just things to think about.
William Bronson wrote:I've only read about smooth pipe used in earth tubes, where they have had issues mold.
Swabbing the insides with rags or pouring cleaners down the holes are some of the remedies.
Theses pipes are not described as being perforated.
In climate batteries, tubing that is corrugated and perforated reportedly avoids mold due to the actions of soil organisms.
I imagine a perforated tube without corrugations are better against mold than ones with corragations.