642_Physics ProblemsTechnical Physics

642_Physics ProblemsTechnical Physics - 644 Heat Engines,...

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644 Heat Engines, Entropy, and the Second Law of Thermodynamics Section 22.5 Gasoline and Diesel Engines P22.31 (a) PV P V i i f f γγ = PP V V fi i f = F H G I K J F H G I K J = γ 300 10 50 0 300 244 6 1.40 . . Pa cm cm kPa 3 3 ej (b) WP d V V V i i = z V V i i = F H G I K J Integrating, V V V ii i f = F H G I K J F H G I K J L N M M O Q P P × F H G I K J L N M M O Q P P = 1 1 1 2 50 3 00 10 5 00 10 1 50 0 300 192 1 65 0400 .. . . . af e j Pa m cm cm J 3 3 3 P22.32 Compression ratio = 600 ., = 140 . (a) Efficiency of an Otto-engine e V V =− F H G I K J 1 2 1 1 e F H G I K J = 1 1 51 2% . . . . (b) If actual efficiency ′ = e 15 0% . losses in system are ee −′= 36 2% P22.33 e VV Otto 1 1 1 1 620 1 1 12 1 75 1 bg a f . . . e Otto
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