Regan Brown
Energy density is a critical factor in the selection of fuels, as it determines the amount of energy that can be stored or transported for a given volume or mass. Diesel fuel, a liquid hydrocarbon, has a high energy density, which has made it a popular choice for transportation and other energy services. The volumetric energy density of diesel fuel is the amount of energy stored per unit volume, while the gravimetric energy density is the amount of energy stored per unit mass. Diesel fuel's high energy density has led to its widespread use and replaced solid fuels such as wood and coal in transportation applications.
| Characteristics | Values |
|---|---|
| Energy density | The amount of energy stored in a given system, substance, or region of space |
| Volumetric energy density | The amount of energy stored per unit volume (e.g. gallon, liter) of a substance |
| Mass or gravimetric energy density | The amount of energy stored per unit mass (e.g. ton, kilogram) of a substance |
| Comparison to other fuels | Diesel fuel has a higher energy density than solid fuels like wood and coal, which is why it is used in transportation |
| Comparison to crude oil | 1 gallon of diesel fuel = 129,000 Btu = 136 MJ = 36 MJ/liter |
| Comparison to gasoline | 1 kg of diesel fuel burns with the oxygen contained in ≈ 15 kg of air |
| Comparison to Uranium | N/A |
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What You'll Learn
Diesel fuel's energy density vs other fuels
Energy density is the amount of energy that can be stored in a given system or substance. It can be measured in energy per volume or per mass. The higher the energy density of a system or material, the greater the amount of energy it has stored.
Liquid hydrocarbons (fuels such as gasoline, diesel, and kerosene) are currently the densest way to store and transport chemical energy on a large scale. Diesel fuel has a high energy density, which is why it is so widely used. The volumetric energy density of diesel fuel is the amount of energy stored per unit volume of the substance. Diesel fuel has a higher energy density than gasoline, which is why it is used in transportation.
However, there are some fuels with even higher energy densities than diesel. Nuclear fuels, for example, are incredibly energy-dense. One kilogram of nuclear fuel like 235Uranium would take a car 1.77 million km, which is enough to get to the moon and back twice. Uranium-235 has about 79 million MJ of energy, which is more than two million times denser than any fossil or biomass fuel.
Other fuels with lower energy densities than diesel include compressed propane, ethanol, and methanol. Natural gas, in either liquefied form (LNG) or compressed (CNG) form, also has a lower energy density than diesel. Hydrogen fuel has an extremely low volumetric energy density, which is why it is not widely used in transportation.
While diesel has a high energy density, it is important to consider other factors as well, such as fuel economy and environmental impact. Electric vehicles with fuel cells powered by hydrogen can have twice the fuel economy of a similarly-sized gasoline vehicle, while battery-powered electric vehicles can achieve four times the fuel economy. However, the costs of fuel cells, hydrogen storage, and batteries are often prohibitively expensive, and the availability of refueling and charging facilities is limited.
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Diesel's role in human energy history
Diesel fuel is a liquid fuel designed for use in a diesel engine, which is a type of internal combustion engine. Diesel engines are named after their inventor, German engineer Rudolf Diesel, who patented his original design in 1892. Diesel fuel is derived from crude oil, which is extracted from the ground through wells and offshore rigs. The crude oil is sent to refineries, where it is heated and turned into gasoline, diesel, kerosene, and other extracts.
For decades, diesel was thrown away as an unwanted byproduct of the refining process. It wasn't until Rudolf Diesel designed the first engine capable of using this byproduct that diesel fuel was seen as a valuable resource. The first oil refinery was built in 1851 in Scotland, primarily to extract paraffin for oil lamps. Kerosene, which replaced paraffin as a common byproduct, and diesel were often discarded because there was no use for them. It wasn't until 1894, when Rudolf Diesel invented the first engine that could use diesel fuel, that it was given its name.
The introduction of motor-vehicle diesel engines in the 1930s created a need for higher-quality fuels with proper ignition characteristics. After World War II, the first modern high-quality diesel fuels were standardised, such as the DIN 51601, VTL 9140-001, and NATO F 54 standards. In 1993, the DIN 51601 was replaced by the EN 590 standard, which is still used in the European Union. Diesel fuel is now produced from various sources, with petroleum being the most common.
Diesel fuel has played a significant role in the history of human energy, especially in the commercial and industrial sectors. Its ability to be used without external ignition, such as lighting a fire, made it a revolutionary fuel source. Diesel fuel is commonly used in heavy trucks, trains, boats, and various vehicles, including those for military purposes. Additionally, diesel-engine generators use diesel fuel to generate electricity in remote locations and for backup and emergency power supply in hospitals, industrial facilities, and electric utilities.
The energy density of diesel fuel, or any fuel, refers to the amount of energy that can be stored in a given system or substance. The higher the energy density, the more energy can be stored or transported for the same volume. Diesel fuel has a high energy density, making it an efficient way to store and transport chemical energy at a large scale.
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How energy density is calculated
Energy density is the amount of energy that can be stored in a given system, substance, or region of space. It can be measured in energy per volume or per mass. The higher the energy density of a system or material, the greater the amount of energy it has stored.
There are different types of energy stored, corresponding to a particular type of reaction. Nuclear reactions, for example, take place in stars and nuclear power plants, and derive energy from the binding energy of nuclei. Nuclear fuels are incredibly energy-dense—a kilogram of nuclear fuel can take a car 1.77 million kilometres. This is the distance from the Earth to the moon and back, twice.
Liquid hydrocarbons, such as diesel, gasoline, and kerosene, are currently the densest way to store and transport chemical energy on a large scale. However, alternative energy sources, such as hydrogen or battery-powered cars, are limited by the energy density of the alternative medium.
The energy content of a fuel can be calculated by measuring the amount of heat produced when burning a single gram of that material in joules per gram (J/g). This is a standard method used in science and engineering. The energy content of a given volume of gas must be measured at a specific temperature and pressure. The higher heating value (HHV) is the amount of heat released at room temperature (25°C) by a mass or volume of fuel after combustion. The HHV formula is:
> HHV = .35X_C + 1.18X_H + 0.10X_S – 0.02X_N – 0.10X_O – 0.02X_{ash}
Where each X represents the fractional mass for carbon (C), hydrogen (H), sulfur (S), nitrogen (N), oxygen (O), and the remaining ash content.
The bomb calorimeter method is an experimental way to calculate energy density, which measures the heat released from combustion that is transferred to the air or water surrounding the container.
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Energy density and fuel efficiency
Energy density is a key factor in the selection of fuels and is defined as the amount of energy that can be stored in a given system, substance, or region of space. It is typically measured in energy per volume or per mass. For example, the energy density of a fuel can be expressed as the amount of energy stored per unit volume (gallon, litre) of the substance (gas, solid, liquid).
Liquid fuels derived from oil, such as diesel, have a high volumetric energy density, which means they can store and provide a large amount of energy in a small volume. This is why diesel fuel replaced solid fuels like wood and coal for transportation. For instance, 1 kilogram of crude oil allows a car to travel about 20 kilometres, while 1 kilogram of nuclear fuel would take a car 1.77 million kilometres.
The energy density of diesel fuel is approximately 136 megajoules per litre or 129,000 British thermal units (BTU) per US gallon. This means that 1 US gallon of diesel fuel contains about 36 megajoules (MJ) or 129,000 BTU of energy.
Energy density is closely related to fuel efficiency. Fuel efficiency refers to the amount of energy obtained from a given fuel source, and it is influenced by the energy density of the fuel. A higher energy density indicates a greater amount of energy stored in the fuel, resulting in improved fuel efficiency. This relationship is particularly evident in the case of diesel fuel. Diesel engines are known for their high fuel efficiency compared to other types of engines, such as gasoline engines. The high energy density of diesel fuel contributes to this efficiency by providing more energy during the combustion process, leading to improved performance and reduced fuel consumption.
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Energy density and fuel storage
Energy density is the amount of energy that can be stored in a given system, substance, or region of space. It can be measured in energy per volume or per mass. The higher the energy density of a system or material, the greater the amount of energy it can store. For energy storage, energy density relates the stored energy to the volume of the storage equipment, for example, a fuel tank. The energy of a fuel per unit mass is called its specific energy.
Liquid hydrocarbons (fuels such as gasoline, diesel, and kerosene) are currently the densest way to economically store and transport chemical energy on a large scale. Diesel fuel has played a vital role in human energy history, alongside wood, natural gas, and other fuels, by providing essential energy services like cooking, thermal comfort, and illumination. Liquid fuels derived from oil have a high mass and volumetric energy density, which has led to their dominance in transportation.
The shift from solid fuels like coal to liquid fuels like oil, which occurred in the British Navy in 1911, was driven by the higher energy density of oil. The higher mass density of oil meant that boilers could be smaller, and ships could travel twice as far. The higher volumetric energy density of oil also freed up substantial storage space for personnel, munitions, and other cargo. Refueling with oil was also faster and less arduous.
Nuclear fuels like uranium have an even higher energy density than liquid fuels. One kilogram of crude oil allows a car to drive around 20 km, while one kilogram of nuclear fuel would take a car 1.77 million km—enough to get from Earth to the moon and back, twice. However, no single energy storage method is the best in terms of specific power, specific energy, and energy density. The exploration of alternative energy storage media for cars, such as hydrogen or batteries, is strongly limited by the energy density of the alternative medium.
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Frequently asked questions
The energy density of diesel fuel is 129,000 Btu or 136 MJ per US gallon, or 36 MJ per liter.
Energy density is the amount of energy that can be stored in a given system, substance, or region of space. It can be measured in energy per volume or per mass.
Energy density is important because it determines the amount of energy that can be stored or transported for a given volume or mass. For example, liquid fuels derived from oil have a high energy density, which is why they replaced solid fuels such as wood and coal for transportation.
Diesel fuel has a higher energy density than solid fuels such as wood and coal, but a lower energy density than nuclear fuels like uranium. For example, 1 kilogram of crude oil allows a car to drive about 20 km, while 1 kilogram of uranium would take a car 1.77 million km.
Energy density refers to the amount of energy that can be stored in a given system or substance, while energy conversion efficiency refers to the net output of energy per input. Energy conversion efficiency takes into account the losses that occur during the energy conversion process.
