Burt Rutan did a study of his own back around 1985 or so, as his
fiberglass creations were all sensitive to heat (room
temperature-cured epoxy/fiberglass). There is no question that
pure, unadulterated white is the best "color" to prevent thermal
gain from direct sun. All other colors, cream, light yellow, even
mirror experienced significant gains above just plain white.
On 8/15/2019 4:31 PM, Ken Hohhof wrote:
difference between standard machine grey and just bright
white spray paint from the hardware store is dramatic. I
suspect everything beyond that is incremental.
around 2005 when I ordered my first outdoor cabinet from
DDB, I thought I wanted unpainted metal aluminum since all
the traffic control boxes I see are plain metal or stainless
steel. The salesperson said I absolutely didn’t want plain
metal because it would get hot in the sun and what I wanted
was the cream color.
If you look up insulating paint on Wikipedia, the entry there
says all ceramic heat-reflective coatings are snake oil.
I did find a good discussion on Scientific American (https://www.scientificamerican.com/article/benefits-of-insulating-paint/).
They don't exactly describe it as snake oil, but they also
suggest that you not get your hopes up.
I suspect you can get your best results with a coat of
reflective white paint, and try to keep it clean.
interesting to do a bake off between this and the
plain “satellite white” I use.
have always found it interesting that highly
reflective things like polished aluminum, chrome and
silver paint seem to be really bad at reflecting
heat/sun. But we have all grabbed a chrome wrench
that has been left in the hot summer sun and
realized hot much it absorbs. I am guessing what we
see as reflective, Infra Red sees as flat black.
Thursday, August 15, 2019 1:46 PM
[AFMUG] Solar load
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