View Full Version : Wet bulb temperature calculation

05-11-2007, 09:37 AM
I appreciate if any one can help me to inform me any easy formula for calculating the wet bulb temperature from air drybulb and humidity.

05-11-2007, 10:24 AM
Perpetual motion, alchemy, snake oil and easy method for calculating WBT (when DBT and RH are known), all belong to same category:p

I am a bit dramatic but the simplest calculation requires to compute 4 other parameters and 2 implicit equations (in simple terms, you should do a trial and error calculation or use iteration techique).

Refer to ASHRAE Handbook of Fundamentals.

06-11-2007, 12:29 AM
Use a physcometric chart.

Lord Kelvin
06-11-2007, 04:29 PM
Excuse me, may be I didnīt understand you, but if you already know the humidity and the dry bulb temp, is just a matter of looking at the chart.

Samarjit Sen
06-11-2007, 05:34 PM
Since you are knowing the Dry Bulb Temperature and the Humidity, then the best way to know the Wet Bulb temperature is to use the psycometric Chart.

Yasser Khaldi
16-11-2007, 09:14 PM
Use a physcometric chart.

17-11-2007, 08:13 PM
Just in case, here's one!

17-11-2007, 10:46 PM
Despite all the valuable opinions, the tables where made by formulas , also a lot of software use such formulas.
Of course it is easy to use the tables.

20-11-2007, 10:45 AM
is this for real????