A piston–cylinder device contains 5 kg of steam at 100°C with a quality of 50 percent. This steam undergoes two processes as follows: 1-2 Heat is transferred to the steam in a reversible manner while the temperature is held constant until the steam exists as a saturated vapor. 2-3 The steam expands in an adiabatic, reversible process until the pressure is 15 kPa.
(a) Sketch these processes with respect to the saturation lines on a single T-s diagram.
(b) Determine the heat added to the steam in process 1-2, in kJ.
(c) Determine the work done by the steam in process 2-3, in kJ.