Good points, thx.
Property has great solar potential at 8,800' altitude in Colorado.
Tanks will be uninsulated on sides & bottom so as to add solar heat into earth, or during extended periods of low solar gain, pull heat out of ground.
Solar panels will be drain down setup, heating tank 1. No HX's
Then pump pressure with a check valve through HP evaporator, then into bottom port of tank 2.
Out of top port of tank 2, through 10' of uninsulated pipe into bottom port of tank 3.
Etc. etc. finally out of top port of tank 10 & back to tank 1.
So tanks 2 - 10 should remain full.
The pump will run with HP, or to move solar heat throughout uninsulated tanks.
Tank 1 will have a float switch to auto fill. I will add drip system emitters around top of tanks 2 - 10 to assist in heat transfer with soil.
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