Rg	         8.314[J/mol/K]	    Universal gas constant                 
T_in_ht	    900[K]	            Inlet temperature, heating tubes       
u_in_ht	    1[m/s]	            Average inlet velocity, heating tubes  
T_in_sr	    700[K]	            Inlet temperature, refomer bed         
p_in_sr	    75[Pa]	            Inlet pressure, refomer bed            
p_ref	      1e5[Pa]	           Reference pressure                     
ht	         100[W/m^2/K]	      Heat transfer coefficient              
D_C3H8_H2	  2.7e-5[m^2/s]	     Binary diffusion coefficient           
D_C3H8_CO2	 5.1e-6[m^2/s]	     Binary diffusion coefficient           
D_C3H8_H2O	 8.4e-6[m^2/s]	     Binary diffusion coefficient           
D_H2_CO2	   3.6e-5[m^2/s]	     Binary diffusion coefficient           
D_H2_H2O	   4.9e-5[m^2/s]	     Binary diffusion coefficient           
D_CO2_H2O	  1.1e-5[m^2/s]	     Binary diffusion coefficient           
M_C3H8	     44.1e-3[kg/mol]	   Molar mass                             
M_H2	       2.016e-3[kg/mol]	  Molar mass                             
M_CO2	      44.01e-3[kg/mol]	  Molar mass                             
M_H2O	      18.016e-3[kg/mol]	 Molar mass                             
w_C3H8_in	  0.28[1]	           Propane weight fraction                
w_H2_in	    0.01[1]	           Hydrogen weight fraction               
w_CO2_in	   0.01[1]	           Carbon dioxide weight fraction         
H_sr	       410e3[J/mol]	      Enthalpy of reaction                  
hj	          1[W/m^2/K]	       Heat transfer coefficient