Wet bulb temperature can be measured by wrapping the senor with a wet wick, however, this method is subjected to high uncertainty. I search for a better method for this measurement.
Alaa Al-Badri,
If the wet wick does not cover the bulb properly and dipped in to the water bottle, there is a possibility of an error. Another reason would be the velocity of air flow over the wet bulb.
If you refer to the index books of RS or Cole-Parmer, they provide with more information on the procedure and electronic instruments also.
Dr.S.Ravindran
Dear Alaa,
Thank you for this question. I agree with you that measuring the wet temperature using a wet wick is accompanied by great uncertainty especially by neglecting the effect of thermal radiation. Some authors say that air must be at a certain speed (relatively high) in order to reduce the measurement error and consider the measured value.
Some electrical sensors, in the form of fine hairs, are sensitive to moisture in the air can give results with better precision.
We used the humid air chart and we measured the steam content and with iterative calculation we were able to determine the characteristics of the humid air including the wet bulb temperature.
I hope this answer will help solve the problem.
Best regards.
Adel OUESLATI
Thank you Adel for your answer.
Can you name some electronic sensor for humidity you used before? and what was the uncertainty in the wet bulb temperature?
Dear / Alaa Al-Badri
Please try to use the hygrometer. The simplest hygrometer - a sling psychrometer - consists of two thermometers mounted together with a handle attached on a chain. One thermometer is ordinary. The other has a cloth wick over its bulb and is called a wet-bulb thermometer. This instrument in not expensive as well as it is more effective.
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