Applying the Exergy Balance: Closed SystemsAs shown in Fig. P7.36, a 0.8-lb metal bar init...

Applying the Exergy Balance: Closed Systems

As shown in Fig. P7.36, a 0.8-lb metal bar initially at 1900°R is removed from an oven and quenched by immersing it in a closed tank containing 20 lb of water initially at 530°R. Each substance can be modeled as incompressible. An appropriate constant specific heat for the water is cw = 1.0 Btu/lb · °R, and an appropriate value for the metal is cm = 0.1 Btu/lb ·°R. Heat transfer from the tank contents can be neglected. Determine the exergy destruction, in Btu. Let T0 = 77°F.

Fig. P7.36