A piston-cylinder contains nitrogen initially at 100 kPa, 20°C, and a volume of 0.283 m³ (State 1). The nitrogen undergoes two processes. First, the nitrogen is compressed to 7000 kPa (State 2) in an isothermal process. Finally, the nitrogen is expanded to 100 kPa (State 3) in a reversible adiabatic process. You may assume that nitrogen is an ideal gas with constant (average) specific heats: Cp = 1.039 kJ/kgK, c, = 0.742 kJ/kgK, and R = 0.297 kJ/kgK.

Problem 5 - Change in entropy for a pure substance A frictionless piston-cylinder assembly contains 0.005 m³ water at 150 kPa and 225°C. Next, the water is cooled at constant pressure until its quality becomes equal to 0.70. Please answer the following. a. Represent the process for the water on a T-s diagram. In your T-s diagram include values for P, T and s. b. Determine the entropy change of the water during this process, in kJ/K using three significant figures. c. Determine the amount of heat removed from the water, in kJ.

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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 well-insulated 4 × 4 × 5 m³ room, initially at 10 °C, is heated by the radiator of a steam heating system. The radiator has a fixed volume of 150 L and is initially filled with superheated water vapor at 200 kPa and 200 °C. After 30 minutes, the pressure of the steam is observed to drop to 100 kPa as a result of heat transfer to the room. Assume constant specific heats for air. (a) (b) (d) Sketch a thermodynamic diagram for the process of the steam. Determine the final temperature of the steam. Based on the final state you found, make any corrections needed to your diagram in (a). neglected. the air. Write the First Law for the air and steam, and indicate which terms can be Assuming the air has a uniform temperature, find the final temperature of