Moist air at standard conditions is at a dry bulb temperature of 93°F and a wet bulb temperature of 59°F. It is cooled in an evaporative (swamp) cooler by adding water along the wet bulb temperature line. Use the psychrometric chart to find:
a. The temperature of the air at a relative humidity of 60%
b. The amount of moisture added to the air after it is cooled, in lb/lb of dry air
c. The amount of moisture added to the air after it is cooled, in lb/ ft³ of dry air
d. The amount of water that must be added to the air per hour at an volumetric flow rate of 250 ft³/min
e. Draw a simple sketch showing the process on a psychrometric chart