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Re: geothermal heating/radiant flooring/domestic hot water
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Posted by Robert Gammon on Tuesday, 6 May 2008, at 1:09 p.m.,
in response to Re: geothermal heating/radiant flooring/domestic hot water, posted by Tony Zemblaku
Existing solutions out there suggest that the coil temp needs to be below 65F to get condensation on the coil (dehumidification), and indoor RH needs to stay near 45% to avoid feeling sticky or clammy.
If Phil's loop stays below 60F in the summer, then he could get a valuable assist from a fan coil that circulates his ground loop thru the coil. He would then use his heat pump for additional dehumidification and for backup when the ground temps get too high. Right now, his ground loop appears to be just under 50F and that would work great at cooling his house IF that temperature would stick year round.
However, I regard this as a cool/cold climate solution to AC. Bill and I will see ground loop temps in the upper 70s to low 80s in the summer. No way to use the ground loop to cool the house. Most of the southern USA, south of I-20 is in this condition (Hot/Humid to Hot/Dry climates). Fan coils and PVC pipe are only partial solutions for summertime AC needs in this region. Refrigeration appears to be the only viable solution here, except in the true desert areas, well away from cities (and their watered lawns, trees, and plants) where evaporative cooling MAY still be possible.
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