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@Rob Torcellini - My indoor system is well insulated, and I'm in an easier climate. But my indoor temps remain very comfortable due to the thermo-mass of the water. If I keep my water at a good temperature the air stays comfortable too.
I had some condensation going on at the glazing, but this year I built a shutter which both insulates and directs extra light into the greenhouse. I built it out of OSB and foil sided foam insulation, but I have plans to reduce the weight of this horizontal shutter by rebuilding it out of PVC-DWV and Mylar. I wish I had a picture but basically there is a hinge on the wall at the bottom of the shutter. I let it down in the morning, and put it up at night. I designed it to reflect light in through the green house glazing.on the South side. It's been working out very well, but it does require that I manually open and shut it twice a day.
This is my next phase of the project. I want to grab some of the heat for the water, but leave enough to heat the building too. Probably will try to extract around 50% of the heat for water and leave the rest for the building. Other than building a water jacket around the entire thing, you'll end up heating the greenhouse!
Rob, Great job, love innovation. I have been noodling on this problem for the last year and a half, I gave up on the rocket stove in the Green house because it required way to much time with me in the cold feeding the stove..
This is a great way to go. however we need to heat water not air, how can this be accomplished and without boiling the fish... lol
Love it
Excellent job.
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