An air-standard cycle with variable specific heats is executed in a closed system with 0.003 kg of

Question:

An air-standard cycle with variable specific heats is executed in a closed system with 0.003 kg of air and consists of the following three processes:
1-2 v = constant heat addition from 95 kPa and 17°C to 380 kPa
2-3 Isentropic expansion to 95 kPa
3-1 P = constant heat rejection to initial state
(a) Show the cycle on P-v and T-s diagrams.
(b) Calculate the net work per cycle, in kJ.
(c) Determine the thermal efficiency.