Author Topic: Dry bulb, Wet bulb & RH calculations  (Read 2269 times)

Offline HencoV

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Dry bulb, Wet bulb & RH calculations
« on: September 08, 2017, 05:59:14 AM »
@ the forum experts...
I am trying to get a meaningful calculated Wet bulb value from an RH & temperature probe. Problem is..when calculating WB from DB & RH, I get one value. (formula using iteration from https://www.weather.gov/epz/wxcalc_rh) Testing the RH value using DB & calculated WB gives a different RH (http://www.1728.org/relhum.htm)..also, I have an excel spread sheet that I've been using all along to calculate RH& EMC. The answers I get from excel corresponds with 1728.org.

eg. weather.gov...DB 60 deg C, RH 30.1% = WB 36.31 Deg C
1728.org & my spread sheet: DB 60 Deg C, WB 36.31 deg c = RH 22%

btw..The reason i'm trying to calculate a WB value from an RH probe is to control vent on WB ...not on RH or EMC, as it fluctuates to much with DB temp fluctuations
Passionate about Timber, Focused on Kiln Drying!!!

Offline HencoV

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Re: Dry bulb, Wet bulb & RH calculations
« Reply #1 on: September 11, 2017, 03:31:15 AM »
..The Higher the temperature and RH, the smaller the error...
Passionate about Timber, Focused on Kiln Drying!!!

 


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