2. We intend to design a counterflow cooling tower filled with cell-type fillings in 30 in. under conditions of a wet bulb temperature of 75^oF with a target of 10^oF at the temperature approach end and 17^oF at the cooling range. The cross-sectional area of the tower is 3636 ft, and the flow rate of air and water is 523,000cfm (at 90^oF) and 6,000 gpm, respectively. (a) What is the change in enthalpy of air at the entrance and before and after the tower? (b) Calculate N_Oy and H_Oy under these conditions. (c) If the wet bulb temperature is 78^oF and the desired temperature access end is 7^oF, how much more charging is needed?