ME40 HW12 Solutions - 15-15Propane is burned with...

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Unformatted text preview: 15-15Propane is burned with theoretical amount of air. The mass fraction of carbon dioxide and the mole and mass fractions of the water vapor in the products are to be determined.PropertiesThe molar masses of C3H8, O2, N2, CO2, and H2O are 44, 32, 28, 44, and 18 kg/kmol, respectively (Table A-1). Analysis(a) The reaction in terms of undetermined coefficients is 2222283NOHCO)N76.3O(HCpzyx++++Balancing the carbon in this reaction gives y= 3 and the hydrogen balance gives 482==zzThe oxygen balance produces 52/432/22=+=+=+=zyxzyxA balance of the nitrogen in this reaction gives 8.18576.376.3276.32====xppxIn balanced form, the reaction is 2222283N8.18OH4CO3N8.18O5HC++++The mass fraction of carbon dioxide is determined from 0.181==++=++==kg4.730kg132kg/kmol)28)(kmol8.18(kg/kmol)18)(kmol4(kg/kmol)44)(kmol3(kg/kmol)44)(kmol3(mfN2N2H2OH2OCO2CO2CO2CO2productsCO2CO2MNMNMNMNmm(b) The mole and mass fractions of water vapor are 0.155==++=++==kmol8.25kmol4kmol8.18kmol4kmol3kmol4N2H2OCO2H2OproductsH2OH2ONNNNNNy0.0986==++=++==kg4.730kg72kg/kmol)28)(kmol8.18(kg/kmol)18)(kmol4(kg/kmol)44)(kmol3(kg/kmol)18)(kmol4(mfN2N2H2OH2OCO2CO2H2OH2OproductsH2OH2OMNMNMNMNmmC3H8Air 100% theoretical Combustion chamber CO2, H2O, N215-20Propane is burned with 75 percent excess air during a combustion process. The AF ratio is to be determined. Propane is burned with 75 percent excess air during a combustion process....
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This note was uploaded on 01/25/2010 for the course ME 55806 taught by Professor Chen during the Spring '10 term at University of California, Berkeley.

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ME40 HW12 Solutions - 15-15Propane is burned with...

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