1. Moist air saturated at 35°F, enters a heating coil at a rate of 20,000 CFM. Air leaves the coil at 100°F. Find the required rate of heat addition. 2. Moist air at 85°F dry-bulb temperature and 50% relative humidity enters a cooling coil at 10,000 CFM and is processed to a final saturation condition at 50°F. Find the tons of refrigeration required. 3. A stream of 5000 CFM of outdoor air at 40° dry bulb temperature and 35° wet- bulb temperature is adiabatically mixed with 15,000 CFM of recirculated air at 75°F dry-bulb temperature and 50% relative humidity. Find the dry-bulb temperature and the wet-bulb temperature of the resulting mixture. 4. Moist air at 70°F dry bulb and 45°F wet-bulb temperature is to be processed to a final dewpoint temperature of 55°F by adiabatic injection of saturated steam at 230°F. The rate of dry air flow ma is 200 pounds per minute. Find the final dry bulb temperature of the moist air in the rate of stream flow required. 5. Moist air is withdrawn from a room at 80° dry-bulb temperature and 66° wet- bulb temperature. The sensible rate of heat gain for the space is 30,000 BTUs per hour. A rate of moisture gain of 10 pounds per hour occurs from the space occupants. This moisture is assumed as saturated water vapor at 90°F. Moist air is introduced into the room at a dry-bulb temperature of 60°F. Find the required wet-bulb temperature and the volume flow rate of the supply air. 1