Applying the Exergy Balance: Control Volumes at Steady State
A counterflow heat exchanger operating at steady state has water entering as saturated vapor at 1 bar with a mass flow rate of 2 kg/s and exiting as saturated liquid at 1 bar. Air enters in a separate stream at 300 K, 1 bar and exits at 335 K with a negligible change in pressure. Heat transfer between the heat exchanger and its surroundings is negligible. Determine
(a) the change in the flow exergy rate of each stream, in kW.
(b) the rate of exergy destruction in the heat exchanger, in kW.
Ignore the effects of motion and gravity. Let T0 = 300 K, p0 = 1 bar.
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