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Discussion Starter · #1 ·
Which is more efficient, a single loop pipe, or circuits?

Is higher or lower soil resistance better?

Using LoopLink.

If I start at my foundation and just dig one continuous trench and lay a single 3/4" HDPE pipe in it; I get soil resistance of 3.92 hr ft F/Btu.

If I lay out circuits, I get 4.93.

Which is better?

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Discussion Starter · #2 ·
I should clarify. As I understand it, the LoopLink app shows the least amount necessary so the difference in soil resistance is more than likely due to one having hundreds more feet of pipe in the ground.

This is LoopLinks definition of Soil Resistance:

Soil Resistance: The heat transfer resistance (hr-ft-F/Btu) in the horizontally-trenched GHEX. Soil resistance is a function of loop pipe diameter, spacing and configuration of the pipes in the trench, the center-center spacing between trenches, the number of trenches to be installed, and soil thermal conductivity.

For more information on soil resistance, refer to Tables 5.17-5.29 (Chapter 5, pages 64-69) in IGSHPA's Ground Source Heat Pump Residential and Light Commercial Design and Installation Guide.
"Resistance" = bad in my mind, does that mean I want a LOWER value?
 
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