Liquid water at 1208F and a volumetric flow rate of 275

Chapter 12, Problem 12.108

(choose chapter or problem)

Liquid water at \(120^{\circ} \mathrm{F}\) and a volumetric flow rate of \(275 \mathrm{ft}^{3} / \mathrm{min}\) enters a cooling tower operating at steady state. Cooled water exits the cooling tower at \(90^{\circ} \mathrm{F}\). Atmospheric air enters the tower at \(86^{\circ} \mathrm{F}\), 1 atm, 35% relative humidity, and saturated moist air at \(100^{\circ} \mathrm{F}\), 1 atm exits the cooling tower. Determine

(a) the mass flow rates of the dry air and the cooled water, each in lb/min.

(b) the rate of exergy destruction within the cooling tower, in Btu/s, for \(T_{0}=-77^{\circ} \mathrm{F}\).

Ignore kinetic and potential energy effects.