[Greenbuilding] more than most want to know about hygrometers
nick pine
nick at early.com
Sun Nov 11 15:34:56 CST 2012
John Straub's buddy Terry Brannen http://www.camroden.com/TerryResume.html
says the easiest way to measure humidity accurately is to measure the dry
bulb air temp Tdb, then stir a glass with some ice and water until you just
see dew on the outside, then measure the dew point temp Tdp on the glass and
look up the RH on a psychometric chart or calculate RH =
100e^(9621(Tdp-Tdb)/((Tdp+460)(Tdb+460))) =
100e^(9621(50.5-70)/((50.5+460)(70+460))) = 50% with Tdb = 70 F and Tdp =
50.5 F.
Nick
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