Calculating Wet-Bulb Temp
Calculating Wet-Bulb Temp
(OP)
I am upgrading some cooling tower controls and would like to monitor sump temperature as compared to ambient wet-bulb temperature. My weather station reads dry-bulb and relative humidity.
I'm willing to assume constant barometric pressure. Does anyone have a nice set of expressions I can use to calculate wet-buld temperature from the measured values?
My ASHRAE book has a set that requires iteration / trial and error. Has anyone done some curve-fitting or the like?
Thanks.
I'm willing to assume constant barometric pressure. Does anyone have a nice set of expressions I can use to calculate wet-buld temperature from the measured values?
My ASHRAE book has a set that requires iteration / trial and error. Has anyone done some curve-fitting or the like?
Thanks.





RE: Calculating Wet-Bulb Temp
this should work for you!
http://www.connel.net/freeware/airduct.shtml
docendo discimus
RE: Calculating Wet-Bulb Temp
Thanks...
RE: Calculating Wet-Bulb Temp
a1 b1 a2 b2
0.724582967 0.81706445 0.112208011 0.17578135
twb=(a1*tdb^b1)*rh^(a2*tdb^b2)
29.91 bar press
temp db 55 to 95, rh 30 to 100
RE: Calculating Wet-Bulb Temp
a1 b1 a2 b2
0.004043651 -0.039353174 0.612121032 3.207748018
twb=(a1*tdb+b1)*rh+(a2*tdb+b2)
same range as equation posted previous to this