TehniÄka termodinamika - Kemijsko-tehnoloÅ¡ki fakultet

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TEHNIČKA TERMODINAMIKA__________________________________________ t = t 220°C 2 1 = q ( s − ) 1,2 = T ⋅ 2 s1 Iz tablica vrela voda i zasićena vodena para (s promjenom temperature) slijedi t = t 222°C 2 1 = p 2 = 24.1 bar v 2 = v2′ + x2 ⋅ ( v2′′ − v2′ ) 0.0738 = 0.0011937 + x 2 ⋅ − x 2 = 0.888 ( 0.08288 0.0011937) −1 −1 ( s′′ − ′ ) = 2.5364 + 0.888( 6.2706 − 2.5364) = 5.8524 kJ kg s 2 = s2′ + x2 ⋅ 2 s2 K b) ( 5.8524 − 6.7977) = 466 q1.2 = 493⋅ − Q1,2 = q1,2 = −466 ⋅15 = −6990 kJ kJ Slika P5.9. Primjer 5.10. Pri konstantnom tlaku od 10 bar suhozasićena para se hladi dok se cjelokupna para ne pretvori u tekućinu. a) Koliki je rad potreban za ovaj proces? 252
______________________________________________________Stvarni ili realni plinovi i pare b) Koliko se topline odvede tijekom procesa i kolika je promjena unutarnje energije? c) Skicirati proces u p, v – i T, s – dijagramu. Rješenje a) Interpolacijom vrijednosti iz tablica vrela voda i zasićena vodena para (s promjenom tlaka) unutar intervala p = 9.81 bar i p = 10.8 bar slijedi za p 1 =10 bar t z =180 °C 253
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Prof. dr. sc. Nedjeljka Petric Prof
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TehniÄka termodinamika - Kemijsko-tehnoloÅ¡ki fakultet

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