Post
by Gravity Mike » Thu Jan 05, 2006 9:34 pm
Robotland: "Coupla years back I talked to some folks who had brought structures similar to those, but that just sat on the ground. Made of mylar-faced cardboard, I think. They SAID that the silvery reflective layer kept it cool inside, but there was little provision for airflow and I doubt that I could have either stretched out OR stood up inside."
With respect to coverings, I can tell you that aluminized mylar is probably the best frabric-type solar energy blocker. It is what they make those emergency blankets out of after all; they reflect infrared well, among other requencies of the EM spectrum. Frequently the issue for effective shade is with the frequencies you don't see.
The first year of our two domes, it was hotter IN the domes than out. We used those heavy duty silver colored tarps. The following year, we glued tin foil to the dome covering and man we have one of the coolest structures around in the afternoon. We glued the foil to the inside so we could color the dome as we liked, but outside would probably work even better. Outside could result in MOOP too, as it does need repair every year. We figured the aluminized mylar was too expensive to cover the dome with, and possibly not strong enough, would tear loose in the wind.
Even with this, I agree that good ventilation is necessary. We have one of those rotating ceiling vents at the top.
Gravity
