An air-standard cycle is executed within a closed piston-cylinder system and consists of three processes as follows:
1–2V = constantheat addition from 100 kPa and 27°C to 700 kPa
2-3 Isothermal expansion untilV3 =V2
3-1P = constantheat rejection to the initial state
Assume air has constant properties withcv =0.718 kJ/kg•K,cp = 1.005 kJ/kg•K,R =0.287 kJ/kg•K, andk = 1.4.
(a) Sketch theP-VandT-sdiagrams for the cycle.
(b) Determine the ratio of the compression work to the expansion work (the back work ratio).
(c) Determine the cycle thermal efficiency.
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