An air-standard cycle with variable specific heats

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 constant heat addition to 1800 K

3-4 Isentropic expansion to 100 kPa

4-1 constant heat rejection to initial state

(a) Show the cycle on P-v and Tdiagrams.

(b) Calculate the net work output per unit mass.

(c) Determine the thermal efficiency.

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