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Q4. A pressure vessel has a volume of 0.8 m³ and contains steam at a pressure and temperature of 20 bar and 250°C respectively.

Steam is removed from the vessel until the pressure is 6 bar. The expansion of the steam during the removal process may be considered isentropic.

The vessel is then cooled until the pressure is 3 bar.

(a) Sketch the processes on a Temperature-specific entropy diagram. (4)

(b) Calculate EACH of the following:

(i) the mass of steam removed; (4)

(ii) the final dryness fraction of the steam; (3)

(iii) the heat transferred during cooling. (5)