TehniÄka termodinamika - Kemijsko-tehnoloÅ¡ki fakultet

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_________________________________________________Drugi glavni zakon termodinamike m 2 −3 p1 ⋅V1 Ar = = 1.29 kg RAr ⋅T1 11⋅10 ⋅ 70 ⋅10 = 8.314 ⋅ 288 40 187
_________________________________________________Drugi glavni zakon termodinamike p m ⋅ R ⋅T 8.314 1.29 ⋅ ⋅ 348 = 40 −3 70 ⋅10 Ar Ar 2 1 = = W max. = U V 1 −U 2 − T 0 ⋅ 1333 kPa ( s − s ) + p ⋅ ( V −V ) 20.93 − 8.314 U1 − U 2 = m ⋅ cv ⋅ ( T1 − T2 ) = 1.29 ⋅ ⋅ ( 348 − 288) = 24. 41 kJ 40 1 T 2 = T 0 p 2 = p 0 ⎛ T p T0 ⋅ p ln ⎝ ( ) ⎜ 1 1 s1 − s2 = T0 ⋅ m ⋅ c ⋅ ln − m ⋅ R ⋅ T ⎟ 2 p2 ⎠ ⎛ 20.93 348 8.314 13.32 ⎞ T0 ⋅ 1 2 ⎜ ⎟ − ⎝ 40 288 40 1 ⎠ ( s − s ) = 288 ⋅ 1.29 ⋅ ⋅ ln −1.29 ⋅ ⋅ ln = 163. 16 ⎛ p 0 ⋅ 10 ⎝ 2 ( ) ⎜ −3 2 V1 − V2 = 1⋅10 ⋅ 70 ⋅ − p ⎟ 2 ⎠ 2 0 1 m ⋅ R ⋅T ⎛ 8.314 ⎞ ⎜ 1.29 ⋅ ⋅ 288 ⎟ p 40 0 ⋅ 1 2 − ⎜ 2 1⋅10 ⎟ ⎝ ⎠ 2 ( ) 1 10 ⎜ −3 V − V = ⋅ ⋅ 70 ⋅10 − ⎟ = 70 Wmax . = 24.41+ 163.16 − 70 = 117.57 kJ 2 ⎞ ⎞ kJ kJ Primjer 4.16. Koliko se maksimalno može dobiti rada iz novonastale smjese ako se 3 700 dm plina masenog sastava H2 = 2 %, CO 2 = 38 % i N 2 = 60 %, 3 temperature 127 °C i tlaka 2.65 bar pomiješa s 800 dm plina masenog sastava CO = 25 % i N2 = 75 % iste temperature i tlaka. Stanje okoline je normalno. −1 −1 C p , CO K 2 Podaci: = 36.08 kJ kmol . 187
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Prof. dr. sc. Nedjeljka Petric Prof
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Izdavač Kemijsko-tehnološki fakul
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TehniÄka termodinamika - Kemijsko-tehnoloÅ¡ki fakultet

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