I came across this very interesting document just now:
Table 1 is called:
Table 1. Recommended Lengths of Trench or Bore Per Ton For GCHPs
It adjusts for ground temperature, soil conditions, the whole thing.
I need to get some work done, but in a few hours, I can parse the relevant information.
In our favor:
- MS has nice warm, wet dirt.
- DX heat extraction is around 15% more efficient
- No HXs to 'pay tax' to.
Against us: Physics
Back in a few hours...
Sincerely,
-AC_Hacker