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  1. billspen

    Calculating Wet-Bulb Temp

    If you can't raise numbers to powers in the PLC here is another solution, not as accurate but should be accurate enought for what you are doing. a1 b1 a2 b2 0.004043651 -0.039353174 0.612121032 3.207748018 twb=(a1*tdb+b1)*rh+(a2*tdb+b2) same range as...
  2. billspen

    Calculating Wet-Bulb Temp

    How about this? 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
  3. billspen

    Psychrometric chart

    check this web site out http://www.hvacware.net/engrproj.html The equations you need are written in Vbasic here for Excel.
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