2009 Ashrae Hof Chapter 4 Equation 48 -pg 4.21-- (Plus)

This is a specific technical request regarding the , Chapter 4 (Psychrometrics), page 4.21, Equation 48 .

[ W = \frac0.62198 \cdot \phi \cdot p_wsp - \phi \cdot p_ws ] 2009 ashrae hof chapter 4 equation 48 -pg 4.21--

After reviewing the 2009 ASHRAE Handbook—Fundamentals (I-P units), I can confirm that is the fundamental relationship used to calculate humidity ratio (( W )) from relative humidity (( \phi )) and barometric pressure (( p )): This is a specific technical request regarding the

However, is:

[ W = 0.62198 \cdot \fracp_wp - p_w ]