Applying the Exergy Balance: Closed Systems Figure P7.96 sho...

Applying the Exergy Balance: Closed Systems

Figure P7.96 shows liquid water at 80 lbf/in.², 300^oF entering a flash chamber through a valve at the rate of 22 lb/s. At the valve exit, the pressure is 42 lbf/in.² Saturated liquid at 40 lbf/in.² exits from the bottom of the flash chamber and saturated vapor at 40 lbf/in.² exits from near the top. The vapor stream is fed to a steam turbine having an isentropic efficiency of 90% and an exit pressure of 2 lbf/in.² For steady-state operation, negligible heat transfer with the surroundings, and no significant effects of motion and gravity, perform a full exergy accounting, in Btu/s, of the net rate at which exergy is supplied: