Thermodynamics filled in class notes_Part_81

Thermodynamics filled in class notes_Part_81 - 169 5.3....

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5.3. FIRST LAW ANALYSIS OF REACTING SYSTEMS 169 5.3.3.3 Dilute, preheated mixture Example 5.11 Consider a variant on the previous example in which the diluted mixture is preheated to 1000 K . One can achieve this via an isentropic compression of the cold mixture, such as might occur in an engine. To simplify the analysis here, the temperature of the mixture will be increased, while the pressure will be maintained. A closed, Fxed, adiabatic volume contains a stoichiometric mixture of 2 kmole of H 2 , 1 kmole of O 2 , and 8 kmole of N 2 at 100 kPa and 1000 K . ±ind the adiabatic ²ame temperature and the Fnal pressure, assuming the irreversible reaction 2 H 2 + O 2 + 8 N 2 2 H 2 O + 8 N 2 . (5.187) The volume is given by V = ( n H 2 + n O 2 + n N 2 ) RT 1 P 1 , (5.188) = (2 kmole + 1 kmole + 8 kmole ) ( 8 . 314 kJ kmole K ) (1000 K ) 100 kPa , (5.189) = 914 . 54 m 3 . (5.190) The Frst law gives U 2 U 1 = 1 Q 2 1 W 2 , U 2 U 1 = 0 , n H 2 O u H 2 O n H 2 u H 2 n O
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Thermodynamics filled in class notes_Part_81 - 169 5.3....

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