Register to reply 
Psychrometrics: Dewpoint temp from Relative Humidity 
Share this thread: 
#1
Mar3112, 01:11 PM

P: 5

1. The problem statement, all variables and given/known data
Air/Water vapor mixture, at 26C and 45%RH. What is the Dewpoint temperature 2. Relevant equations T_{dp} = T_{sat} when p_{g}=p_{v} RH = p_{v}/p_{g} 3. The attempt at a solution From the psychrometric chart I can get the Humidity ratio, volume per kg dry air, Enthalpy, and T_{sat}. I hope what I've collected here can count toward an "attempt" at a solution. This is not homework. It is a practice problem for the FE exam. This was never covered in my thermo class. I'm sure it is simple, but it is escaping me now. thanks for any help you can provide. 1. The problem statement, all variables and given/known data 2. Relevant equations 3. The attempt at a solution 


#2
Mar3112, 03:10 PM

P: 39

There is a fairly complicated equation on wikipedia for dew point. http://en.wikipedia.org/wiki/Dew_point
If you have all the variables you can just plug and chug. I don't know if that formula is in your FE reference book or not though. 


Register to reply 
Related Discussions  
Relative Humidity more than 100%  General Physics  4  
Volumetric Humidity at given Temp and Pressure?  Engineering, Comp Sci, & Technology Homework  0  
Relative humidity  Introductory Physics Homework  3  
Atmospheric Density from: Alt, Temp, Pressure & Humidity  Introductory Physics Homework  2  
Calculating Density Alttitude of Air knoing temp/baro/humidity?  General Physics  3 