About Correcting Gas Streams for Standard Conditions

Professional Engineer & PE Exam Forum

Help Support Professional Engineer & PE Exam Forum:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

ENV

New member
Joined
Sep 5, 2019
Messages
1
Reaction score
0
Excuse me,

why is the answer multiplied by (1-moisture) instead of 1/(1-moisture) like formula in handbook?

Thanks.

formula.png

A513.png

Q513.png

 
The formula in ERH uses the mol fraction of moisture, rather than the percent moisture. It seems like if the problem doesn't state to assume that the rest of the air is Nitrogen we don't need to calculate the mol fraction, which is given by multiplying the percent fraction by ((MW of H2O)/(MW of N2 + MW of H2O)). At least that's the best I can do to understand it.

 
Back
Top