As I was in the process of studying for the Mechanical Engineering PE exam, I found that looking up values on the Psychrometric chart not only was a waste of precious time, but also a chance for silly mistakes by not reading the values precisely.
After thinking about it for some time, I wondered why there were no texts or reference material with all of these calculations completed for sea-level pressure. It does turn out that there are quite a few permutations of tables that one may need.
What I decided was that I needed to look up properties given dry-bulb temperature and one of the three other common pairs.
- Wet bulb temperature
- Relative humidity
- Dew point temperature
I made the grid size for the tables small enough that it would hardly be necessary to interpolate more precisely than just taking half the difference.
The table values were created using python, and so if you'd like to create a slightly different version of this, you can.
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