TehniÄka termodinamika - Kemijsko-tehnoloÅ¡ki fakultet

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_________________________________________________Drugi glavni zakon termodinamike Slika 35. Izoterma u T, s – dijagramu Izotermni proces možemo prikazati kako slijedi a promjena entropije Iz jednadžbe stanja T δ q = du + p ⋅ dv 1 = T2 → u1 = u2 → du = δ q = p ⋅ dv , p ⋅ dv ds = . T p R p ⋅ v = R ⋅T → = . T v Ako taj izraz uvrstimo u prethodnu jednadžbu, slijedi a za promjenu od 1 do 2 ∆ s T dv ds = R , v = s 2 − s 1 2 ⌠ dv = R⎮ ⌡ v 1 0 135
TEHNIČKA TERMODINAMIKA _________________________________________ Za T = konst. je te slijedi v ∆ s R ln 2 T = ⋅ . v 1 v2 p1 = v1 p2 d) Q = 0 (adijabatski proces) p ∆ s R ln 1 T = ⋅ . p 2 Za adijabatu vrijedi δq = 0. Promjena entropije je δq ds = T iz čega slijedi ds = 0, tj. s je konstantno, kako je prikazano na dijagramu, slika 36. Zato se adijabata naziva i izentropa. Slika 36. Adijabata u T, s – dijagramu 136
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Prof. dr. sc. Nedjeljka Petric Prof
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