"Adiabatic Flame Temperatures - Propane Combuston"

"Equation of Combustion of Propane in Air

C3H8 + 5 (O2+3.773 N2)  = 3 CO2 + 4 H2O + 5*3.773 N2"

T1=298.15

"Calculations will be based on mass of 1 kg C3H8"

m_C3H8 = 1
m_O2 = 5*MOLARMASS(O2)/MOLARMASS(C3H8)
m_CO2 = 3*MOLARMASS(CO2)/MOLARMASS(C3H8)
m_H2O=4*MOLARMASS(H2O)/MOLARMASS(C3H8)
m_N2 = 5*3.773*MOLARMASS(N2)/MOLARMASS(C3H8)

"Enthalpy of Products and Reactants"

H_R = m_C3H8*ENTHALPY(C3H8,T=T1)+m_O2*ENTHALPY(O2,T=T1)+m_N2*ENTHALPY(N2,T=T1)
H_P = m_CO2*ENTHALPY(CO2,T=T2)+m_H2O*ENTHALPY(H2O,T=T2)+m_N2*ENTHALPY(N2,T=T2)
DELTA_H = H_P-H_R

"This gets adiabatic flame temp. for constant pressure combustion."

DELTA_H=0

"Internal Energy of Products and Reactants"

U_R = m_C3H8*INTENERGY(C3H8,T=T1)+m_O2*INTENERGY(O2,T=T1)+m_N2*INTENERGY(N2,T=T1)
U_P = m_CO2*INTENERGY(CO2,T=T3)+m_H2O*INTENERGY(H2O,T=T3)+m_N2*INTENERGY(N2,T=T3)
DELTA_U = U_P-U_R

"This gets adiabatic flame temperature for constant vol. combustion"

DELTA_U=0