Brake Thermal Efficiency

Views Updated: Dec 15, 2025

Abbreviation

BTE

Pronunciation

/breɪk ˈθərməl ɪˈfɪʃənsi/

Engine performance is expressed in terms of brake thermal efficiency.
However, the brake thermal efficiency increases and the CO emissions almost equal at high loads.
The results show that under the conditions of same engine speed and equal excess air coefficient, the brake thermal efficiency of diesel-methanol blended fuels is higher than that of neat diesel fuel due to the improvement of combustion caused by the properties of diesel-methanol blended fuels.
Under rated load conditions, the quantity of methanol can be burned up to 80 % of the total weight of methanol and diesel fuel consumed with a brake thermal efficiency of 38.3 % which is 6.1 % higher than that when only diesel fuel is used.
The HC emissions increase then decrease under the same pilot diesel quantity. Low brake thermal efficiency and excess HC emissions at light loads can be improved by increasing the amount of pilot diesel at the cost of high NOX emissions at high loads.

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