2-28 - 2-28 Equations Set 3: 2-28 Carbon dioxide gas in a...

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Unformatted text preview: 2-28 Equations Set 3: 2-28 Carbon dioxide gas in a piston-cylinder assembly expands from an initial state where p1 =80 psia, V1 =0.65 ft3 to a final pressure of p2 =20 psia. The relationship between the pressure and volume during the process is pV1.3 = constant. Calculate the work done in ft-lbf and Btu. P1 = 80 [psia] V1 = 0.65 ft3 P1 V11.3 = Constant P2 V21.3 = Constant P2 = 20 [psia] integrate P dV W = -Constant lbf /ft2 V2-0.3 - V1-0.3 144 0.3 psia Btu ft lbf (6) (1) (2) (3) (4) (5) WBtu = W 0.001285067 (7) Solution Constant = 45.7 psia-ft3.9 W = 6834 [ft-lbf ] P1 = 80 [psia] WBtu = 8.782 [Btu] P2 = 20 [psia] V1 = 0.65 ft3 V2 = 1.888 ft3 ...
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