Generally, panels painted with brush/roller have proven moopy. In the temperature swings, the paint has shown a propensity to flake off, making for a cleanup chore.
Some spray-painted panels - with thinner coats of paint - have proven slightly more resistant to moop flaking. I will note two things about the foil-covered panels: - The article you link talks about re-emission on the back side of aluminum. However, the polyiso provides quite a bit of insulation to prevent the re-emission. - Aluminet seems to be preferable to other shade cloth on the Playa. This is anecdotal, but Playa Wisdom™ -jb On Saturday, August 4, 2018 at 9:05:22 PM UTC-4, Bob Hearn wrote: > > After I'd explained my new yurt design (see older posts) at a conference a > while back, a physicist friend of mine came up to me and said "I'll never > understand why everyone goes with aluminum-coated panels -- it's such a bad > idea". > > He explained that aluminum is optically gray (not an especially high > albedo, especially when dusty), but white in IR. Meaning, it absorbs > visible light, heats up, and can't reradiate the heat effectively. So the > heat is conducted into the panels. > > By contrast, observatories are painted with a white paint which, while it > also absorbs some visible light, reradiates it all in IR very effectively. > So, the dome doesn't heat up. > > I found this link which puts some hard numbers to this: > > http://umich.edu/~lowbrows/reflections/2001/tryan.5.html > > Has anyone tried painting their panels? I would hate to be the guy that > mooped up the playa with paint flakes after a dust storm. So, any tips on > paint selection or sealant would be appreciated. > > -- You received this message because you are subscribed to the Google Groups "hexayurt" group. To unsubscribe from this group and stop receiving emails from it, send an email to hexayurt+unsubscr...@googlegroups.com. To post to this group, send email to hexayurt@googlegroups.com. Visit this group at https://groups.google.com/group/hexayurt. For more options, visit https://groups.google.com/d/optout.
