A 0.18-m3 rigid tank is filled with saturated liquid water at 120°C. A valve at the bottom of the tank is now opened, and one-half of the total mass is withdrawn from the tank in the liquid form. Heat is transferred to water from a source at 230°C so that the temperature in the tank remains constant. Determine the total entropy generation for this process.

5 kg block of steel initially at 160°C is dropped into an insulated tank that contains 12 L of water at 20°C. Determine (a) the final equilibrium temperature, (b) the specific entropy generated in this process.

An insulated rigid tank is div led into two equal parts by a partition. Initially, one part contains 5 kmol of an ideal gas at 25 kPa and 40°C, and the other side is evacuated. The partition is now removed, and the gas fills he entire tank. Determine the total entropy change during the process.

Refrigerant 134a enters a compressor at 600 kPa as a saturated vapor. It exits at 60°C and 1.4 MPa. Determine the entropy change and the isentropic efficiency. Show the process on a T-s diagram with respects to the saturation lines. (30)

An insulated piston-cylinder device contains 0.5L of saturated liquid water at a constant pressure of 100 kPa. An electric resistance heater inside the cylinder is now turned on, and 1178.36 kJ of electrical work is transferred to the steam. Determine (a) the entropy change of the water during this process; (b) the entropy generation during this process? 1178.36 kJ M H₂O 100 kPa Sat. liquid