3 In A Piston Cylinder Assembly 30 Ft Of Air At T 800 R Pi 120 Lbf In Undergoes A Polytropic Expansion To A Final 1 (96.35 KiB) Viewed 38 times
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3. In a piston cylinder assembly, 30 ft' of air at T₁-800 °R, pi-120 lbf/in² undergoes a polytropic expansion to a final pressure of 65.4 lbf/in² as depicted in Figure 2. The process follows pv¹4 = constant. The work is W=314.34 Btu. Considering the air as an ideal gas and neglecting the effect of potential and kinetic energy, calculate, a. The mass of the air, in lb and the final temperature, in °R b. The heat transfer, in Btu. (20 points) em Air Figure 2 — W=314.34 Btu
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