Question: Hot combustion gases (air) at 1500 K is, used as heat source in a heat engine where the gas is cooled to 750 K and

Hot combustion gases (air) at 1500 K is, used as heat source in a heat engine where the gas is cooled to 750 K and the ambient is at 300 K. This is not a constant T source. How does that affect the efficiency?

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