dew point formula

[Samuel]

I have a question that is stumping me.  Does anyone know how to figure the dew point?  I have a question pertaining to it.  I need to know the dew point of a room having a dry-bulb temperature of 72 degrees fahrenheit and a wet-bulb temperature of 65 degrees fahrenheit.  I hope someone can help me.

[iamrichard]

you need a psychrometric chart. These programs can be downloaded for free. You plug in the information you have and it gives you an answer. Google it and you will find that Trane, York, and Carrier along with a few others offer free downloads for this program. Taking a good guess I would say for what you are reporting there the dew point temperature will be 40 to 45 degrees F.

[Zipdaddy]

According to a chart I found online, your dewpoint would be 61.348.......degrees F ;

[sajid]

YOU CAN FREE DOWNLOAD THE PDF FORMATE OF PSYCHROMETRIC CHARTS FROM INTERNET. TAKE A PRINT OUT. AND YOU CAN CALCULATE MANY VALUES (INCLUDING DEW POINT)...............SAJID HERE..........

[JC]

On your psychr chart, take your 72/65 space condition and trace a straight line to the left till you reach saturation (where WB = DB)...and that is your dew point.