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Old 03-22-2019, 07:44 PM   #6 (permalink)
ksa8907
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The equations of thermodynamic efficiency do not concern the operating temperature. The idea is to extract the heat energy from the combustion process. So, it's the difference in thermal energy between peak combustion temp and the temperature as the piston reaches bdc.

For reciprocating engines, it is difficult to improve due to the nature of the very simple and short process.
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