In a foundry, metal castings are cooled by quenching in an oil bath. Typically a casting weighing 20 kg and at a temperature of 450 C is cooled by placing it in a 150-kg in volatile oil bath initially at 50 C. If CP of the metal is 0.5 J/kg K, and CP of the oil is 2.6 J/kg K, determine the common final temperature of the oil and the casting after quenching if there are no heat losses. Also, find the entropy change in this process.

For each of the following process: a) sketch the p-v diagram, b)sketch t-s diagram, c) sketch t-v diagram, d) sketch the boundary work on one of the diagrams (a, b or c) and e) sketch the reversible heat transfer on one of the diagrams (a, b or c): 1- isobaric process from compressed liquid to superheated vapor 2- isothermal process from compressed liquid to superheated vapor 3- isentropic process from compressed liquid to superheated vapor