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  1. #1
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    Question Wet bulb temperature



    Hi every one...

    I am new in this forum, I am a industrial refrigerantion engineer in Brazil since 2008.
    Right now, I need some help to find an equation or software or anything else to calculate wet bulb temperature from dry temperature and humity...

    Thanks!
    Renata



  2. #2
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    Re: Wet bulb temperature

    Hi, Renata

    welcome to RE forums...

    Quote Originally Posted by Renata View Post
    Hi every one...

    I am new in this forum, I am a industrial refrigerantion engineer in Brazil since 2008.
    Right now, I need some help to find an equation or software or anything else to calculate wet bulb temperature from dry temperature and humity...

    Thanks!
    Renata
    maybe this will be of some help ... the last one is not bad ... enjoy ....

    http://www.srh.noaa.gov/epz/?n=wxcalc_rh

    https://www.easycalculation.com/weat...calculator.php

    http://www.daikin.be/en/support-and-...are-downloads/
    http://www.daikin.be/en/binaries/Psy...505-229283.zip


    Best regards, Josip

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  3. #3
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    Re: Wet bulb temperature

    Hi Renata,

    I use a formula from a study of Roland Stull - University of British Columbia, Vancouver, that gives an approximative value good enought for me. It is valid from -20ºC and +50ºC except for situations both with low humidity and temperature. You can try it:

    T.BH = T.Seca *ATAN(0,151977*(HR +8,313659)^(1/2))+ATAN(T.Seca +HR )-ATAN(HR -1,676331)+0,00391838*(HR )^(3/2)*ATAN(0,023101*HR )-4,686035

    There are others more simple but with worst results.

    Best regards,
    Carlos Duque

  4. #4
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    Re: Wet bulb temperature

    Hi Renata,

    You can use the psychrometric chart. You get the point for the dry bulb temperature and relative humidity you have and then you follow the line with constant enthalpy (the evaluation is aproximately an adiabatic/constant enthalpy) and you get the wet bulb temperature on the saturation temperature of the air on the limit curvy line, at 100% relative humidity.
    To make progress is never good enough, I want to do better and better and better

  5. #5
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    Re: Wet bulb temperature

    You can also use one of the many Psychro applications existing for PC, IOS or Android.
    For example for PC you can try:
    https://www.munters.com/en/specific-...tric-software/

  6. #6
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    Re: Wet bulb temperature

    Thanks a lot!

  7. #7
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    Re: Wet bulb temperature

    cduque,
    It will help me a lot, thank you very much.

  8. #8
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    Re: Wet bulb temperature

    Thanks, Sandro, but I was looking for an automatic method, because I will use in a excel sheet with many data points.

  9. #9
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    Re: Wet bulb temperature

    Quote Originally Posted by Renata View Post
    Thanks, Sandro, but I was looking for an automatic method, because I will use in a excel sheet with many data points.
    Ok. I see.

    "Já agora, bem vinda ao forum da refrigeração. De que zona do Brasil és?"
    To make progress is never good enough, I want to do better and better and better

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