Using Energy Concepts and the Ideal Gas Model
One kg of air in a piston–cylinder assembly undergoes two processes in series from an initial state where p1 = 0.5 MPa, T1 = 227°C:
Process 1–2: Constant-temperature expansion until the volume is twice the initial volume.
Process 2–3: Constant-volume heating until the pressure is again 0.5 MPa.
Sketch the two processes in series on a p–v diagram. Assuming ideal gas behavior, determine (a) the pressure at state 2, in MPa, (b) the temperature at state 3, in °C, and for each of the processes (c) the work and heat transfer, each in kJ.
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