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.
Hea received in cycle
Applying the first law at P=C (1-2)
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