How to calculate fuel consumption of diesel engine?
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A correctly tuned diesel engine consumes fuel according to its power requirements. Simple really, the more power you produce the more fuel you use.
The fuel consumption rate for many makes of Diesel Engines can be found in a range between 0.380 & 0.450 lbs/hp hour; 172 & 181 grams/hp hour; 231 & 243 grams/kW hour. This does not represent a big difference in fuel consumption per power unit between most normal naturally aspirated diesel engines, while turbocharged engines are not significantly better.
Fuel consumption for diesel engines is normally more difficult to express than for petrol engines because of the vast variability in possible applications. Applications like stationary industrial, marine, automotive, and earthmoving are examples of this variability. So it is normal to express this fuel consumption as a rate in terms of the weight of fuel consumed per unit of power produced. A real headache for plant managers!
Now even if an engine operates for long periods at a constant speed it seldom operates at its full rated power. On a dynamometer, engines seem to operate best at about 70% of expected maximum power, they seem quite tireless when operating there.
Still, asset control may be critical for profitable operation so we trust the following formulae & tables may be of some use.
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