An air-standard cycle with variable specific heats is executed in a closed system and is composed of the following four processes:
1–2V = constantheat addition from 14.7 psia and 80°F in the amount of 300 Btu/lbm
2-3P =constantheat addition to 3200 R
3-4 Isentropic expansion to 14.7 psia
4-1P =constantheat rejection to initial state
(a) Show the cycle onP-VandT-sdiagrams.
(b) Calculate the total heat input per unit mass.
(c) Determine the thermal efficiency.
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