Re: [AFMUG] Solar load

[Bill Prince]

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. bp <part15sbs{at}gmail{dot}com> On 8/15/2019 4:31 PM, Ken Hohhof wrote: The difference between standard machine grey and just bright white spray paint from the hardware store is dramatic.  I suspect everything beyond that is incremental.   Also back 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.   From: AF <af-boun...@af.afmug.com> On Behalf Of Bill Prince Sent: Thursday, August 15, 2019 6:19 PM To: af@af.afmug.com Subject: Re: [AFMUG] Solar load   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.   bp <part15sbs{at}gmail{dot}com>   On 8/15/2019 1:12 PM, ch...@wbmfg.com wrote: Be interesting to do a bake off between this and the plain “satellite white” I use.      I 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.    From: Bill Prince Sent: Thursday, August 15, 2019 1:46 PM To: af@af.afmug.com Subject: Re: [AFMUG] Solar load   Which reminds me of this material that a friend clued me in on. You can get this at Home Depot (for example). It is pricey; around $250 per 5 gallon bucket, AND it needs a top coat of another material at near the same price. However, for an advertised reduction in temperature of over 60 degrees F, it may be worth a look. https://superiorcoatingsolutions.com/super-therm/ bp <part15sbs{at}gmail{dot}com>   On 8/15/2019 12:35 PM, Lewis Bergman wrote: I remember Chuck doing a study on this same subject so I thought there might be some interest. Cabinet heat load   -- Lewis Bergman 325-439-0533 Cell -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com

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