What is the calorific value of diesel?
4 Answers
The calorific value of diesel is 3.3×10^7J/L. Below is more information about diesel: Introduction 1: Diesel has a higher heat capacity per unit volume than gasoline, so it can travel more kilometers per liter. The exhaust gases from diesel combustion are different from those of gasoline. Although some pollutants are lower, because diesel contains more impurities and burns less completely without ignition, it produces more soot. Various automobile companies are developing technologies to reduce pollution. Introduction 2: For example, to reduce pollution caused by soot, in recent years, diesel-burning machines, including automobiles, in Western European countries must be equipped with dust filters before they can be used.
Just came back from a long-distance trip and did the math while refueling. Regular 0# diesel has about 42.5 megajoules of energy per kilogram, equivalent to the energy of ten kilowatt-hours. I drive a heavy truck for cargo, with an 800-liter fuel tank that lasts for 1,200 kilometers, which translates to an energy consumption equivalent to 36 kilowatt-hours per 100 kilometers. The higher the calorific value, the more powerful the engine, but it also depends on the purity of the fuel. Diesel with more impurities has a lower calorific value and emits black smoke. The experienced attendant at the gas station said that China VI diesel generally has a calorific value of around 43 megajoules, which is higher than that used in older diesel engines.
Over the years of energy-saving retrofits, the most frequently measured parameter has been fuel calorific value. The median calorific value of standard automotive diesel in China is approximately 43MJ/kg, with one liter of diesel releasing about 36 megajoules of heat when fully combusted. Interestingly, biodiesel has about 5% lower calorific value but offers better environmental performance. Calculated conversion shows that for every 1MJ increase in calorific value, fuel consumption per 100 kilometers decreases by roughly 0.3 liters. Fleet managers pay special attention to this parameter as it directly impacts transportation cost accounting.
Last month's new employee training specifically covered diesel fuel parameters. The standard No. 0 diesel has a calorific value fluctuating between 42.5-43.5 MJ/kg, depending on refining processes. This value is approximately 15% higher than gasoline, making diesel vehicles more fuel-efficient. During refueling, it was observed that diesel with a density of 0.835 has 6% higher energy density than 0.815, allowing vehicles to travel farther with the same volume. Gas station records indicate that diesel's calorific value tends to be slightly higher in summer than in winter.
