Moist air enters a control volume operating at steady

Chapter 12, Problem 12.67

(choose chapter or problem)

Moist air enters a control volume operating at steady state with a volumetric flow rate of \(3500 \mathrm{ft}^{3} / \mathrm{min}\). The moist air enters at \(120^{\circ} \mathrm{F}\), 1.2 atm, and 75% relative humidity. Heat transfer occurs through a surface maintained at \(50^{\circ} \mathrm{F}\). Saturated moist air and condensate exit the control volume, each at \(68^{\circ} \mathrm{F}\). Assuming \(\dot{W}_{\mathrm{cv}}=0\), and kinetic and potential energy effects are negligible, determine

(a) the mass flow rate of condensate, in lb/min.

(b) the rate of heat transfer, in Btu/min.

(c) the rate of entropy production, in \(\mathrm{Btu} /{ }^{\circ} \mathrm{R} \cdot \min\).

(d) the rate of exergy destruction, in Btu/min, for \(T_{0}=50^{\circ} \mathrm{F}\).