An air-standard cycle with variable specific heats is executed in a closed system and is composed of the following four processes:
1-2 Isentropic compression from 100 kPa and 27°C to 800 kPa
2-3 v = constant heat addition to 1800 K
3-4 Isentropic expansion to 100 kPa
4-1 P = constant heat rejection to initial state
(a) Show the cycle on P-v and T-s diagrams.
(b) Calculate the net work output per unit mass.
(c) Determine the thermal efficiency.