An air-standard cycle with variable coefficients is executed in a closed system and is composed of the following four processes:
1-2 V 5 constant heat addition from 100 kPa and 278C to
300 kPa
2-3 P 5 constant heat addition to 10278C
3-4 Isentropic expansion to 100 kPa
4-1 P 5 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.