Question Bank • QB_FP_145 NAT • 2 Marks

Section 3: Farm Power

Farm Power

Subtopic: Calculation of power, torque, fuel consumption, heat load and power losses

Question Statement:

A diesel-biodiesel blend (B20) contains $20\%$ biodiesel and $80\%$ petroleum diesel by mass. The lower heating value (LHV) of pure biodiesel is $38.5\text{ MJ/kg}$ and that of pure diesel is $42.5\text{ MJ/kg}$. Calculate the LHV of the B20 fuel blend in $\text{MJ/kg}$.

Answer Key:

41.7

Step-by-Step Solution & Explanation

By mass-weighted mixture rule: $\text{LHV}_{\text{blend}} = (0.20 \times 38.5) + (0.80 \times 42.5) = 7.70 + 34.00 = 41.70\text{ MJ/kg}$
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