TehniÄka termodinamika - Kemijsko-tehnoloÅ¡ki fakultet

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_________________________________________________Drugi glavni zakon termodinamike b) Stanje p kPa v m 3 kg −1 T K 1 120 0.669 303 2 1706 0.114 734 3 68.69 1.208 313 4 68.69 1.169 303 R s ω 3 N = 2 8 , ω 4 O = 2 8 , ω 1 CO = 2 8 R ∑ω ⋅ R s = i i R s = ω N ⋅ R + ω ⋅ R + ω ⋅ R 2 N2 O2 O2 CO2 CO2 3 8.314 4 8.314 1 8.314 0.265 kJ kg −1 K 1 = ⋅ + ⋅ + ⋅ = − 8 28 8 32 8 44 R ⋅T1 v 1 = = = 0.669 m kg p 120 1 0.265 ⋅ 303 3 −1 R ⋅T4 0.265 ⋅ 303 p4 = = = 68.69 kPa v 4 1.169 3 p 3 = p4 = 68.69kPa R ⋅T3 v 3 = = = 1.208 m kg p 68.69 0.265 ⋅ 313 3 −1 Za stanje 2 ne znamo nikakav parametar. Međutim, točka 2 povezana je s točkom 1 politropom, a s točkom 3 adijabatom. Zato T T 1 2 ⎛ v = ⎜ ⎝ v 2 1 ⎞ ⎟ ⎠ n-1 → 303 ⎛ v2 ⎞ = ⎜ ⎟ T ⎝ 0.669 ⎠ 2 1.5−1 T T 3 2 ⎛ v = ⎜ ⎝ v 2 3 κ -1 ⎞ ⎟ ⎠ → 313 ⎛ v2 ⎞ = ⎜ ⎟ T ⎝1.208 ⎠ 2 κ −1 181
TEHNIČKA TERMODINAMIKA__________________________________________ κ = c p cv ∑ω ⋅ c c p = i p, i c p c p = ω N ⋅ c + ω ⋅ c + ω ⋅ c 2 p,N2 O2 p,O2 CO2 p, CO2 3 29.31 4 29.31 1 35.08 0.950 kJ kg −1 K 1 = ⋅ + ⋅ + ⋅ = − 8 28 8 32 8 44 0.950 0.265 0.685 kJ kg −1 K −1 c v = c p − Rs = − = κ = T T 2 303 ⎛ v2 ⎞ ⎜ ⎟ ⎝ 0.669 ⎠ 0.950 0.685 = 1.387 303 2 = 0.5 ⎛ v2 ⎞ ⎜ ⎟ ⎝ 0.669 ⎠ 313 = ⎛ v2 ⎞ ⎜ ⎟ ⎝1.208 ⎠ 0.5 0.387 313 = ⎛ v2 ⎞ ⎜ ⎟ ⎝1.208 ⎠ 0.387 0.5 0.387 ⎛ v2 ⎞ ⎛ v2 ⎞ 1.033 ⋅ = ⎟ ⎠ ⎜ ⎟ ⎝ 0.669 ⎠ ⎜ ⎝1.208 0.5 ⋅1.033logv − 0.5 ⋅1.033log0.669 = 0.387logv2 2 − 0.1295logv 2 = −0.1223 T 3 −1 v 2 = 0.114 m kg 303 = ⎛ 0.114 ⎞ ⎜ ⎟ ⎝ 0.669 ⎠ 2 = 0.5 734 K 0.387log1.208 182
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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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