[Greenbuilding] Condensation on windows

[nick pine]

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