[Greenbuilding] Condensation on windows
nick pine
nick at early.com
Mon Oct 29 20:57:30 CDT 2012
Bob klahn <Home-NRG at dnaco.net> wrote:
>> IR thermometers do not read accurately on glass...
> They read close enough, even without adjusting for a 0.88 vs 0.95
> emissivity.
Well, maybe not. If they expect a 0.95 emissivity and read 60 F (520 R) for
glass with a 0.88 emissivity, 0.88sTg^4 = 0.95s520^4 makes the actual glass
temp Tg = (0.95/0.88)^0.25x520 = 530 R, ie 70 F, correcting with a
calculator.
Nick
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