5.12 an evaporative cooling tower (see fig. p5.12) is used to cool water from 110 to 80 °f. water enters the tower at a rate of 250,000 lbm/hr. dry air (no water vapor) flows into the tower at a rate of 151,000 lbm/hr. if the rate of wet airflow out of the tower is 156,900 lbm/hr, determine the rate of water evaporation in lbm/hr and the rate of cooled water flow in lbm/hr.