Applying the Exergy Balance: Control Volumes at Steady State
Air at T1 = 1300°R, p1 = 16 lbf/in.2 enters a counterflow heat exchanger operating at steady state and exits at p2 = 14.7 lb/in.2 A separate stream of air enters at T3 = 850°R, p3 = 60 lbf/in.2 and exits at T4 = 1000°R, p4 = 50 lbf/in.2 The mass flow rates of the streams are equal. Stray heat transfer and the effects of motion and gravity can be ignored. Assuming the ideal gas model with cp = 0.24 Btu/lb · °R, determine (a) T2, in °R, and (b) the rate of exergy destruction within the heat exchanger, in Btu per lb of air flowing. Let T0 = 520°R, p0 = 1 atm.
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