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+clc;clear;

+//Example 15.10

+

+//given values

+T0=298;//in K

+

+//contansts used 

+Ru=8.314;//in kJ/kmol K

+

+//calculations

+// CH4 + 3(O2 + 3.76N2)  = CO2 + 2H2O + O2 + 11.28N2

+//from std. values of heat of formation and ideal gasses in Appendix

+//methane as m

+hfm=-74850;

+//oxygen as o

+hfo=0;

+h298o=8682;

+//nitrogen as n

+hfn=0;

+h298n=8669;

+//water as w

+hfw=-241820;

+h298w=9904;

+//carbondioxide as c

+hfc=-393520;

+h298c=9364;

+//x refers to hCO2 + 2hH2O + 11.28hN2

+xac=1*(hfm)+1*(h298c-hfc)+2*(h298w-hfw)+11.28*(h298n-hfn);

+//from EES the Tprod is determined by trial and error

+Tprod=1789;

+disp(Tprod,'the temperature of the products in K');

+//entropy calculations by using table A-26

+//Si = Ni*(si - Ruln yiPm

+//reactants

+Sm=1*(186.16-Ru*log(1*1));

+So=3*(205.04-Ru*log(0.21*1));

+Sn=11.28*(191.61-Ru*log(.79*1));

+Sreact=Sm+So+Sn;

+//products

+Nt=1+2+1+11.28;//total moles

+yc=1/Nt;

+yw=2/Nt;

+yo=1/Nt;

+yn=11.28/Nt;

+Sc=1*(302.517-Ru*log(yc*1));

+Sw=2*(258.957-Ru*log(yw*1));

+So=1*(264.471-Ru*log(yo*1));

+Sn=11.28*(247.977-Ru*log(yn*1));

+Sprod=Sc+Sw+So+Sn;

+Sgen=Sprod-Sreact;

+disp(Sgen,'exergy destruction in kJ/kmol - K');

+Xdestroyed=T0*Sgen/1000;//factor of 1000 for converting kJ to MJ

+Xdestroyed=ceil(Xdestroyed);

+disp(Xdestroyed,'in MJ/kmol');

+//This process involves no actual work. Therefore, the reversible work and energy destroyed are identical

+Wrev=Xdestroyed;

+disp(Wrev,'the reversible work in MJ/kmol')