Shade helps a lot too. On Fri, Aug 16, 2019 at 9:17 AM castarritt . <castarr...@gmail.com> wrote:
> All of our DDB boxes have the brushed metal finish. I painted one of them > with some white elastomeric roof coating stuff from Lowes that is meant to > reflect solar energy, and the peak internal temp only went down ~5°F. We > have a lot of gear in that box, so I think an application with a larger > ratio of solar gain to internal heat generation would benefit more. After > the paint failed to solve the problem, I replaced the 110cfm fans with a > pair of 48vdc 250+cfm fans, and the temp went down 20°F; it does make a lot > more noise though. > > On Thu, Aug 15, 2019 at 6:31 PM Ken Hohhof <af...@kwisp.com> 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 >> <https://www.ddbunlimited.org/wp-content/uploads/2019/08/Solar-Load-on-DDB-Enclosures.pdf> >> >> >> >> -- >> >> Lewis Bergman >> >> 325-439-0533 Cell >> >> >> >> ------------------------------ >> >> -- >> AF mailing list >> AF@af.afmug.com >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> >> >> >> -- >> AF mailing list >> AF@af.afmug.com >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > -- Lewis Bergman 325-439-0533 Cell
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