3 kg of water, initially at 300 kPa and 200 degrees Celsius (state 1), supports a free floating piston. Heat is removed from the water until the piston reaches on a set of stops (state 2), at which point the water occupies half its initial volume. The system of water continues to lose heat until it reaches a final temperature of 100 degrees Celsius (state 3). Determine the following: (a) Determine the work done between states 1 and 2. (b) Determine the work done between states 2 and 3. (c) Determine the net heat transfer from states 1 to 3.

Ammonia in a piston-cylinder assembly undergoes two processes in series. Initially, the ammonia is saturated vapour at P₁=1000 kPa. Process 1-2 involves cooling until the piston meets the stops where the position is locked in place at which time quality is x2=75%. The second process from state 2 to state 3, involves heating (at constant volume) until x3=100%. If the mass is 0.45 kg determine: The work for process 2-3 (in kJ). The heat transfer for process 2-3 (in kJ). Sketch the processes on a p-v diagram, what does the area under the curve represent?

Thermodynamics A Piston-Cylinder system initially contains R-134a refrigerant at a temperature of 2.8 bar and 40 C, and its initial volume is 0.1 m3. First, heat is transferred to the system by keeping the piston constant and this process is continued until the pressure is 3.2 bar. the process is maintained by allowing the volume to change. At the end of this process, the temperature reaches 50C. Assuming the state changes as if balanced, calculate the following: a)He amount of heat transferred during constant pressure operation b)Show the state changes on the P-v diagram.