A piston-cylinder arrangement contains air modeled as an ideal gas with constant specific heat ration of k =1.4. The air undergoes a power cycle consisting of four processes in series: Process 1 to 2:

A piston-cylinder arrangement contains air modeled as an ideal gas with constant specific heat ration of k =1.4. The air undergoes a power cycle consisting of four processes in series: Process 1 to 2: constant temperature expansion at 600 k from p_1 = 0.5 MPa to p_2 = 0.4 MPa. Process 2 to 3: Polytrophic expansion with n = k to p_3 = 0.3 MPa Process 3 to 4: constant pressure compression to V_4 =V_1 Process 4 to 1: constant volume heating. Sketch the cycle on a p-v diagram. Determine (a) the work and heat transfer of each process in kJ/kg and (b) the thermal efficiency.

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