DX vs Glycol/HDPE loop
AC Memphis
From Wikipedia direct exchange geothermal:The boreholes are drilled to a length of 50, 75 or 100 ft (15, 22 or 30 m) with a diameter of 3 inches (76 mm). A total of 100 feet (30 m) to 140 feet (43 m) of drilling is needed for each ton (3.5 kWth) of system capacity. At 40' from your home a 60' line set is doable.
Its good your weighing all your options.
What are you brazing with?? Silphos brazing is one of the easiest.
What is your plan on the other end? Are you air conditioning and heating with a fan center??
One other thought. If your going to through the loops in the pond both systems will want to float so they will need to be weighted. There is a commercially made system for HDPE made for ponds but I have no idea their cost.
For a day I had a pond with HDPE is this what your thinking??
The shell and tube worked, but I had them freeze up many times even though my flow was good. It was a good thing the outside shell was a flexible plastic but even so it did fail badly. I could imagine inside the ice slowly forming around the tubes reducing the flow and ultimately freezing solid. The proper antifreeze to prevent the freezing isn't cheap either.
Randen
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