Thermal efficiency is a measure of how well an engine converts the energy in its fuel into useful work. It's calculated as the ratio of the work output to the heat input.
Here's the formula:
Thermal Efficiency = (Work Output / Heat Input) x 100%
For example, an engine with a thermal efficiency of 30% means that 30% of the energy in the fuel is converted into useful work, while the remaining 70% is lost as heat.
