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Wet Bulb Calculation from Dry Bulband Dew Point

Wet Bulb Calculation from Dry Bulband Dew Point

Wet Bulb Calculation from Dry Bulband Dew Point

(OP)
I am looking to use real weather data from the last 30 years in some calculations and I can only find data available that has dry bulb temperature, Dew Point, and pressure data.  Does anyone know of a function I can use in Excel, I realize it will have to involve VB, that can do these calcs for me?  I am working with hourly data over 30 years, so I do not have any desire to do this by hand.

Alternatively is the an equation I can use to approximate the Skew-T diagram?  I think I can calc it from there, but I am not positive.

Thank you

RE: Wet Bulb Calculation from Dry Bulband Dew Point

(OP)
Thank you.  

Do you think that is the best add-in?  It seems as thought the demo works well and I verified a few answers via multiple online calculator's, but if you mentioned there are several do you have a recommendation?

 

RE: Wet Bulb Calculation from Dry Bulband Dew Point

That was just the first one I looked at from many Google hits.

There are plenty of free ones too.  

RE: Wet Bulb Calculation from Dry Bulband Dew Point

Thank you.

RE: Wet Bulb Calculation from Dry Bulband Dew Point

Use the formulas in ASHRAE Handbook of fundamentsls in Psychrometrics. That is sure-fire.

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