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Engine - Thermal Efficiency

Brake thermal efficiency from SFOC and fuel NCV - ~50 % typical for slow-speed 2-stroke, 44 % for medium-speed 4-stroke.

Thermal efficiencyEngineSFOC
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Formula, assumptions, and limits

ηBT=3600SFOCNCV\eta_{BT} = \frac{3600}{SFOC \cdot NCV}
SymbolMeaningUnit
SFOCSFOCSpecific fuel consumptiong/kWh
NCVNCVNet calorific valueMJ/kg

Source: MAN ES / WinGD Performance

In short

Brake thermal efficiency from SFOC and fuel NCV - ~50 % typical for slow-speed 2-stroke, 44 % for medium-speed 4-stroke.

Learn the theory Engine Performance Monitoring: PMI Systems