I've watched a few videos and love what Russ is doing. From what I've seen, the geothermal system is a series of drain tile pipes (4" I'm guessing???) that run around fairly deeply
underground OUTSIDE the
greenhouse.
Does he suck in frigid outside air and heat it up in the tubes before entering the
greenhouse or does it take
greenhouse air (say 45 degrees) and send it through the geothermal loop to heat up to 60 and return to the
greenhouse?
I
think the tubes are 8' deep or something like that. Does anyone know for sure?
I'm going to do a simple version of that within my
greenhouse. I'll take hot and possibly humid air from the peak of the roof and blow it underground through a series of shallow 4" perforated drain tile pipes. I'm thinking the pipes will be a foot or less underground. The air flow will be divided among maybe 10 pipes that are each 15' long. By the time the air reaches the outlet of the pipes and returns to the greenhouse interior, it
should have cooled down significantly, heated up the soil in the
root zone and possibly condensed some moisture out of the air, giving a phase change energy transfer and reducing the overall humidity in the greenhouse.