=+3-34.

A building has a calculated cooling load of 20 tons, of which 5 tons is latent load. The space is to be maintained at 72 F db and 50 percent relative humidity. Ten percent by volume of the air supplied to the space is outdoor air at 100 F db and 50 percent relative humidity. The air supplied to the space cannot be less that 55 F db, Assume barometric pressure at sea level, and using the program PSYCH, find

(a) the minimum amount of air supplied to the space in cfm.