The formulations used here to calculate moist air properties are
based on perfect gas relations published in 1989 ASHRAE Fundamentals Handbook,
which should be accurate enough in majority of air-conditioning
problem. Nevertheless, I strongly recommend you to compare the
results calculated by this worksheet with a psychrometric chart.
There is no error checking so you should use reasonable input
values. Don't hesitate to let me know if you
find any bugs.