--------
Tom Van Baak writes:
>For scale, assume the room is 1 meter × 1 meter × 2 meters deep. So
>that's vastly smaller than digging a basement, but much larger than
>drilling a 8 inch round pipe. Digging down gives some natural isolation
>and temperature regulation. A couple tons of concrete gives high
>stability vertical walls for the pendulum clocks.
I researched this extensively before we built a house 5 years ago.
Look at the plot on page 37 in this paper:
https://www.researchgate.net/publication/279526204_Temperatur_og_temperaturgradienter_ved_og_under_jordoverfladen_i_relation_til_lithologi
It shows that in Denmark the yearly temperature variations in
penetrates to a depth of 15 meters, and that even at 10 meters
depth, you can expect the swing to be several Kelvin in any year.
I did find handwaving which said tree-cover reduced the swing by
"a lot" but no measurements to substantiate it.
In the end I concluded that I could do better in the comfort of my lab.
You should try to find similar data for your local climate and
geology, before you pour too much money into a hole in the ground.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
[email protected] | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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