Before 1999, performing a mixed air process or a evaporative cooling analysis meant printing out a massive chart, taping it to a drawing board, and physically drawing lines with a sharp 2H pencil. If your slope was off by a degree, your coil load was off by tons.
: Includes ASHRAE Psychrometric Charts 1–5 in I-P units and Charts 1–7 in SI units. HVAC Process Simulation Ashrae Psychrometric Analysis Cd Version 7 Free Download
: The most reliable way to obtain the software is through the ASHRAE Bookstore Before 1999, performing a mixed air process or