WetBulb Temp Calculation

[PLC Gremlin]

I'm sure this will be a stupid question but..

What do you mean by the Data didn't Fit?
Those WetBulb values are what would be correct for those Temps and RH Variables. They are not the incorrect Wetbulbs that my current equation spit out.
I may be incorrect in assuming what you were thinking though.

 

[elalev]

wetbulb as a function of temperature and rel. humidity



Hi,
regarding your quest, I think the following formulas may be configured in your PLC:
F3 = (-0.004 * OARH) + 0.3814
F4 = (0.03363 * OARH) - 2.418
DEP = (F3 * OAT) + F4
WETBULB = OAT - DEP
where:
OAT = Outside Air Temp (F)
OARH = Outside Air Rel Humid (%) - sea level
WETBULB is fairly accurate when 20 < OARH < 100 %
and 4 < OAT < 110 F

 

[Ananya]

With the values of dry bulb and RH, you can calculate wetbulb temperature using a simple formula.