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Old 06-08-15, 04:57 PM   #116
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Location: Portland, OR
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Default Hole Depth...

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...


I'm not an HVAC technician. In fact, I'm barely even a hacker...

Last edited by AC_Hacker; 06-08-15 at 05:30 PM..
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