Water is cooled in a cooling tower that has cross-sectional area of 20 square feet. water enters the tower at a mass flow rate of 2 pounds per hour. water is to be cooled from 120 °f to 80 °f. inlet air conditions are represented by a dry-bulb temperature of 60 °f and a wet-bulb temperature of 50 °f. a mass-transfer coefficient of 80 pounds per hour per foot per mole ratio is expected. air is flowing at a mass velocity, g of 800 pounds per hour per square foot. estimate the height of the tower.