What Does Thermal Efficiency Mean in Cars?

1 Answers
DeSarah
07/24/25 8:16am
Automotive thermal efficiency refers to the ratio between the mechanical work output by the engine and the chemical energy produced by fuel combustion, which evaluates how much heat is converted into effective work. During engine operation, only a portion of the thermal energy contained in the fuel is transformed into propulsion work, while the rest is lost as heat or kinetic energy. Below is an introduction to thermal efficiency: 1. One of the indicators for evaluating engine performance: The higher the thermal efficiency of an engine, the better its fuel economy, performance, and emissions. 2. The value of thermal efficiency: The thermal efficiency of mainstream engines worldwide mostly ranges between 30%-38%, with some advanced ones exceeding 40%.
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