Answer to Question #208357 in Mechanical Engineering for Mohamed sadique

Question #208357

A certain mass of air is initially at 267°C and 7 bar occupies 0.21 m3. The air is expanded at. constant pressure such that volume becomes three times the initial volume. A polytropic process with n =1.3 is then carried out, followed by an isothermal process which completes the cycle. Considering all the processes reversible, find : (i) The heat rejected and received during each process. (ii) Net work done during the cycle. iii) Sketch the cycle on p-V and T-s diagram.

Expert's answer

Part i

Hea received in cycle

Applying the first law at P=C (1-2)

Process (2-3)

Total heat received in the cycle = 1029.7 +244.55=1274.25 kJ

Heat rejected in the cycle

The first law in process 3-1

Part ii

Part iii

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