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Q1. A mass of 2 kg of carbon dioxide at a pressure and temperature of 12 bar and 800°C respectively, expands in an isentropic process to a pressure of 2 bar.

It is then cooled at constant pressure to a temperature of 15°C.

(a) Sketch the processes on Pressure-Volume and Temperature-specific entropy diagrams. (2)

(b) Calculate EACH of the following:

(i) the net-work transfer; (5)

(ii) the net-heat transfer; (3)

(iii) the overall change in entropy; (3)

(iv) the mean temperature of heat rejection. (3)

Note: Atomic mass relationships C =12 , O = 16

Universal gas constant  = 8.3145 kJ/kmol K

For Carbon dioxide γ = 1.33 .