Memphis91
What a great project. I wouldn't be able to find it again but I saw the amount of copper/
ton of heat was 100ft. so a loop of 50 out and 50 back to the manifold. For HDPE its 600ft/ton. I believe for the residential installation they had used 3/8 copper tube brazed to a manifold. When I was installing a ground loop with HDPE 1" the cost was $1.00/ foot and I see that 3/8 tube is about that cost/foot and you will use a lot less.
Look at it this way an outside unit (residential) uses 5/16 and 3/8 Dia copper in their aluminum fins.
There is a copper product now that has a thin plastic skin that will mediate corrosion.
Randen
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