9-17E An air-standard cycle with variable specific heats is executed in a closed system and is composed of the following four processes: 1-2 v constant heat addition from 14.7 psia and 80°F in the amount of 300 Btu/lbm 2-3 P constant heat addition to 3200 R 3-4 Isentropic expansion to 14.7 psia 4-1 P constant heat rejection to initial state a) Show the cycle on P-v and T-s diagrams. b) Calculate the total heat input per unit mass. c) Determine the thermal efficiency. Answers: b) 612.4 Btu/lbm, c) 24.2 percent | |
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