Carbon dioxide (CO2) at 1008F, 18 lbf/in.2 and a

Chapter 12, Problem 12.37

(choose chapter or problem)

Carbon dioxide (\(\mathrm{CO}_{2}\)) at \(100^{\circ} \mathrm{F}\), \(18 \mathrm{lbf} / \mathrm{in}^{2}\) and a volumetric flow rate of \(250 \mathrm{ft}^{3} / \mathrm{min}\) enters an insulated control volume operating at steady state and mixes with oxygen (\(\mathrm{O}_{2}\)) entering as a separate stream at \(190^{\circ} \mathrm{F}\), 18 lbf/ in.2 and a mass flow rate of 60 lb/min. A single mixed stream exits at \(15 \mathrm{lbf} / \mathrm{in}^{2}\) Kinetic and potential energy effects can be ignored. Using the ideal gas model with constant specific heats, determine for the control volume

(a) the temperature of the exiting mixture, in \({ }^{\circ} \mathrm{F}\).

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

(c) the rate of exergy destruction, in Btu/min, for \(T_{0}=40^{\circ} \mathrm{F}\).