Subtopic: Calculation of power, torque, fuel consumption, heat load and power losses
Question Statement:
An engine develops 42 kW brake power when it runs with B20 fuel (80% biodiesel and 20% diesel by volume) with a brake thermal efficiency of 24%. The heating value of the fuel is 46.15 MJ kg⁻¹ and its density is 0.845 kg L⁻¹. The fuel consumption of the engine in L h⁻¹ will be ___________. [round off to two decimal places]
Official Answer Key:
14.00 to 18.00
Step-by-Step Solution & Explanation
• ṁf = BP/(ηbth×HV) = 42/(0.24×46150) = 0.0037923 kg/s = 13.652 kg/h
• Volume rate = 13.652/0.845 = 16.16 L/h
Computed value: 16.16 L/h (within official range 14.00–18.00)
Section 4 — Soil and Water Conservation Engineering
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