John Hait's book goes into a lot of mathematical detail on this and he concludes that if you have 20 feet of dry dirt, you can carry the heat of summer all through the cold of winter. Thermal inertia!
Well, I don't want to have a house that is 20 feet deep, and Hait doesn't suggest that. Instead, wrap this much dry dirt around more than half of the house. He has done this more than once and the result is a home that requires no heat.
So you have a layer of structure (R 2.5 to R 5), polyethylene on the structure, about 8 inches of dry dirt (R 2.64), about four inches of wood duff (R 5.0), another layer of polyethylene and then 20 inches of wet dirt (R 1). This brings our roof R-value to about R 11 or better - pretty good! Plus, a healthy dose of thermal inertia!
Peter Ellis wrote:Adrien, I thought I had understood what Paul was talking about when he said "ATI". He made it seem pretty clear that it was his way of saying PAHS or AGS.
Those terms refer to systems where you actually run tubes under the ground in an area protected against the flow of water, transferring heat from the air into the ground during warm periods and pulling it back out when the air is cooler than the ground. It's much more than just an earth bermed structure.
Peter Ellis wrote:Net - this is a small earth bermed log cabin with a passive solar design.
Tyler Flaumitsch wrote:I was under the impression that you were going to point the gable end of the structure south to be able to replicate the terraced idea out the larger front and to see what the solar gain would be.
How do you plan on measuring performance?
Seriously Rick? Seriously? You might as well just read this tiny ad:
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