Before you go to all this trouble, PLEASE verify your waste water heat value. You claim it is between 80 and 90 F.
Waste water recovery works best when the water inlet temp is cold, preferably below 45 F. I believe your water inlet temp is about 65 F.
Do not get the peak temp of waste water, get a 24 hour average. Not hard to do. THEN, design the heat recovery system.
Steve
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consulting on geothermal heating/cooling & rational energy use since 1990
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