There has been a lot of interest about replacing gasoline withethanol, but is this really a good idea? We’re going to compare ablend of ethanol (70% ethanol and 30% gasoline by volume) togasoline. Calculate the lower heating value (LHV) of a 70%ethanol/30% isooctane mixture in terms of kJ/mol of fuel. Assumecomplete combustion. How does this compare to the tabulated valuefor gasoline (isooctane)? Assuming a 20% thermal efficiency, if youneed to get 100 kW of power from an engine, how much of each fuel(in mol/s) do you need? If you have a stoichiometric mixture of theethanol/gasoline blend and air in your 100 kW engine, how much CO2are you emitting in g/s? How does this compare to the same enginerunning a stoichiometric mixture of 100% gasoline and air?
