In the process of making carbon fibers, controlled humidity is required during the cooling of the fibers. The cooling air must have a relative humidity of 30% and a dew point of 66°F. 70,000 ft3/hr of outside air measured at 85°F and having a wet-bulb temperature of 67°F is to be used. You have a heater and an adiabatic humidifier available.
Determine:
1. The relative humidity of the air exiting the humidifier.
2. The heat load in the heater in BTU/hr.