1. A room containing 275 m3 of air at 1.00 atm pressure is to be humidified. The initial conditions are TDB = 24.0°C and ? = 20.0%, and the final conditions are TDB = 20.0°C and ? = 60.0%. Determine the mass of water that must be added to the room air.
2. 1000. ft3 /h of moist air at atmospheric pressure, 80.0°F and 70.0% relative humidity is to be cooled to 50.0°F at constant total pressure. Find whether or not this can be done without the removal of water from the air. If it cannot, determine the minimum amount of water that must be removed in lbm/h.