A piston-cylinder device contains 13 kg of refrigerant-134a at 750 kPa and 70 ∘C. The refrigerant is then cooled at constant pressure until it comes to thermal equilibrium with the atmosphere, which is at 20 ∘C. (a). Determine the amount of entropy transfer (S) into the atmosphere. (b). Determine the change of entropy (ΔS) of the refrigerant. (c). Determine the entropy generated (Sgen,univ) in the system's universe.

Water at the initial pressure and temperature of P1 = 40 bar and T1 = 553.15K, respectively, is cooled at constant volume, while heat is transferred to the surroundings at T0= 288.15K. At the end of the cooling process, the pressure is P2 = 9 bar. Questions: (a) Calculate the entropy change of the water during the process. (b) Calculate the entropy produced during the process.

Draw the P-V diagram of the following mechanically reversible process of an ideal gas in a closed system and calculate the total work done. Indicate whether this work is done by the system or on the system. a. State A (2V, P) to State B (V, P) b. State B (V, P) to State C (V, 2P) c. State C (V, 2P) to State D (3V, 2P) d. State D to State A. What is the total internal energy change, enthalpy change and net heat flow (added or extracted) for the process?

A rigid tank containing air is subjected to a reversible process in which it is heated from its initial state at T1 = 600 K and P1 = 1.5 bar to a final state with P, = 4.352 psi. Assuming that air can be modelled as an ideal gas, determine the specific change in entropy As12. (kJ/kg-K). Your Answer: