636_Physics ProblemsTechnical Physics

636_Physics ProblemsTechnical Physics - 638 Heat Engines,...

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638 Heat Engines, Entropy, and the Second Law of Thermodynamics P22.16 The Carnot summer efficiency is e T T cs c h , . =− =− + + = 11 273 20 273 350 0530 af K K And in winter, e cw , . =− = 1 283 623 0546 Then the actual winter efficiency is 0320 0330 . . . . F H G I K J = or 33 0% . P22.17 (a) In an adiabatic process, PV f f i i γγ = . Also, T T ff f ii i F H G I K J = F H G I K J γ . Dividing the second equation by the first yields TT P P fi f i = F H G I K J 1 bg . Since = 5 3 for Argon, == 12 5 0400 . and we have T f = × × F H G I K J = 1073 300 10 150 10 564 3 6 K Pa Pa K . . . (b) ∆∆ En C T Q W W V int = eng eng 0 , so Wn C T V eng , and the power output is P P. = −⋅ = W t nC T t V eng mol kg or kg J mol K K s W2 1 2 k W 80 0 8 314 564 1 073 60 0 212 10 1.00 00399 3 2 5 .. . . ej ch b g (c) e T T C c h = 564 0475 K K . or 47 5%
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