Liquid water is to be heated in a nonmixing heat exchanger with waste steam. The liquid water (an incompressible liquid) flows through the heat exchanger at 15.0 lbm/s with an inlet temperature of 50.0°F and an exit temperature of 75.0°F.
The steam flows through the heat exchanger at 3.00 lbm/s with an inlet state of 600.°F and 60.0 psia and an exit state of 400.°F and 40.0 psia.
Determine the second law availability efficiency of this heat exchanger. Neglect all kinetic and potential energy effects, and use saturated liquid water at 50.0°F as the local environment (ground state).