Example
An 1-kg metal bar initially at 1000 K is removed from an oven and quenched by immersing in a closed tank containing 20 kg of water initially at 300 K. Assume both substances are incompressible and c(water)=4(kJ/kg K), c(metal)=0.4(kJ/kg K). Neglect heat transfer between the tank and its surroundings. (a) Determine the final temperature of the metal bar, (b) entropy generation during the process.