Discussion
Assuming calorific value of diesel and producer gas as 35280 and 3.97 MJ m−3, respectively, the brake thermal efficiency of the engine in percentage is
Answer: B
The brake thermal efficiency is about 19.13%.
The calorific value of diesel, 35280 MJ m−3, is 35.28 MJ per litre. The hourly energy input from both fuels is:
\[ \begin{aligned} \text{diesel} &= 0.46 \times 35.28 = 16.23\ \text{MJ/h} \\ \text{gas} &= 12.5 \times 3.97 = 49.63\ \text{MJ/h} \\ \text{input} &= 65.85\ \text{MJ/h} = 18.29\ \text{kW} \\ \eta &= 3.5/18.29 = 19.13\% \end{aligned} \]
Counting only the producer gas gives 3.5/13.78 = 25.4%, close to the 25.32 distractor. In dual fuel mode the pilot diesel is part of the energy input and must be included.
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