Week 4 - Combustion Efficiency Calculation after Preheating

A furnace is used to burn Methane and Air Mixture. A recuperator is connected to this furnace to recover some energy.

1. What is the effect of preheating on the adiabatic flame temperature?
   1. Change pre-heating from 298 to 600K
   2. Explain your results
2. Does preheating help with fuel saving? If yes, how does combustion efficiency go up as a function of pre-heating temperature? Assume that the furnace exit temperature is 1700K (For this case assume that the combustion products are CO2, H20, and N2).
   1. Write the formula for combustion efficiency
   2. Plot the effect of pre-heat temeprature on combustion efficiency
   3. Is it right or wrong to assume a fixed furnace exit temperature? Explain your answer.

NOTE: You will use cantera for these calculations. Assume the LHV of combustion of Methane as 50 MJ/KG.