Reconsider Prob. 15–88. The automobile engine is to be converted to natural gas (methane, CH₄) fuel. Assuming that all factors remain the same, what is the maximum work that can be produced by the modified engine, in kJ/kg fuel?

Data From Q#88:

n-Octane [C₈H₁₈(l)] is burned in an automobile engine with 200 percent excess air. Air enters this engine at 1 atm and 25°C. Liquid fuel at 25°C is mixed with this air before combustion. The exhaust products leave the exhaust system at 1 atm and 77°C. What is the maximum amount of work, in kJ/kg fuel, that can be produced by this engine? Take T₀ = 25°C.

Transcribed Image Text:

Qout CH4 Combustion 25°C chamber Products 77°C 200% excess air 1 atm 25°C