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Diesel fuel, also known as diesel oil, is a combustible liquid obtained from the distillation of crude oil. It is specifically designed for use in diesel engines, which are larger than gasoline engines and require more engine oil. Diesel engines are commonly found in heavy machinery and vehicles such as trucks, tractors, and construction equipment. Diesel fuel has a higher energy density than gasoline, making it more suitable for applications that require high torque and the ability to handle heavy loads. However, diesel engines have a lower maximum RPM, making them less suitable for smaller cars that prioritize speed and acceleration. In terms of fuel efficiency, diesel engines are generally more efficient than gasoline engines due to their higher compression ratio and thicker density.
| Characteristics | Values |
|---|---|
| Diesel fuel | Any liquid fuel designed for use in a diesel engine |
| Diesel engine | Larger, heavier, more complex fuel injection system, higher fuel prices |
| Diesel fuel production | Petroleum diesel is the most common type, produced by fractional distillation of crude oil |
| Diesel fuel consistency | Light oil, less dense at high temperatures |
| Diesel fuel efficiency | 20-40% more efficient than gasoline |
| Diesel fuel use | Used in heavy machinery, large vehicles, and some light vehicles |
| Engine oil | Diesel engines need more engine oil |
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What You'll Learn
Diesel fuel is denser than petrol
Diesel fuel, also known as diesel oil, heavy oil, or simply diesel, is designed for use in diesel engines, which are a type of internal combustion engine. Diesel fuel is denser than petrol, with a density of around 0.820 to 0.845 kg/L at 15 °C, compared to petrol's density of 0.720 to 0.775 kg/L at the same temperature. This higher density gives diesel fuel a greater volumetric energy density, meaning it contains about 15% more energy by volume than petrol (approximately 36.9 MJ/litre compared to 33.7 MJ/litre).
The higher energy density of diesel fuel translates into greater fuel efficiency and lower CO2 emissions when compared to petrol. Specifically, a diesel engine can be up to 40% more efficient than a spark-ignited petrol engine with the same power output. This efficiency is despite the fact that diesel engines are typically heavier than petrol engines.
The difference in energy density between diesel and petrol is due to the distinct compositions of these fuels. Diesel fuel is composed of alkanes containing 12 or more carbon atoms, while petrol is made up of a mix of alkanes and cycloalkanes with a chain length of between 5 and 12 carbon atoms. The higher number of carbon atoms in diesel fuel contributes to its greater density and energy content per volume.
The production methods for diesel and petrol also differ. Both fuels are derived from mineral oil, but the specific refining processes vary. Diesel fuel is generally easier to refine than petrol, but it contains more pollutants that must be removed before it can meet emissions standards. The process of refining diesel fuel involves fractional distillation of crude oil at temperatures between 200 and 350 °C, followed by additional treatments to remove impurities and adjust the fuel's characteristics.
In summary, diesel fuel is denser than petrol, and this density difference has significant implications for the relative efficiencies and emissions of diesel and petrol engines. The higher density of diesel fuel results from its composition and production methods, and it contributes to the fuel's higher energy content per volume.
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Diesel engines are larger
The larger size of diesel engines means they need more engine oil. Diesel engines also have more complex fuel injection systems. For example, diesel fuel injectors need to operate at around 10,000 psi, compared to 2,000 psi for petrol injectors. This means that diesel engines require stronger and heavier fuel tubes and fuel pumps.
Diesel engines are commonly used in large vehicles such as trucks, tractors, trains, and delivery trucks. They are also used in heavy machinery and industrial settings. Diesel engines are well-suited for these applications because they are more fuel-efficient and can handle heavier loads.
Diesel engines are also more durable and long-lasting than gasoline engines. They experience less wear and tear due to the lubricating properties of diesel fuel. Additionally, diesel fuel is less likely to create a fire since it does not require a spark to ignite. However, diesel engines tend to be more expensive than gasoline engines, and the price of diesel fuel is typically higher.
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Diesel has a higher energy density
Diesel fuel is denser than gasoline, with about 15% more energy by volume. This means that diesel has a higher energy density than gasoline. This higher energy density makes diesel preferable for heavy machinery use, as it produces more energy.
Diesel fuel is a combustible liquid obtained from the distillation of crude oil. The most common type of diesel fuel is a specific fractional distillate of petroleum fuel oil, but alternative sources that are not derived from petroleum, such as biodiesel, biomass-to-liquid (BTL), or gas-to-liquid (GTL) diesel, are also used. Diesel typically contains between 9 and 25 carbon atoms per molecule. The distillation process involves heating crude oil between 200 and 350 °C at atmospheric pressure, resulting in a mixture of carbon chains.
Diesel engines are larger than gasoline engines, and they have more complex fuel injection systems. This means that diesel engines require more engine oil and have higher fuel prices. Diesel engines also have a higher compression ratio, which allows them to be more fuel-efficient than gasoline engines. The higher compression ratio in diesel engines also contributes to their higher torque, making them better suited for handling and towing heavy loads.
The higher energy density of diesel fuel is particularly advantageous for heavy machinery and vehicles that require more torque over horsepower. Diesel engines are commonly used in buses, trains, delivery trucks, farm and construction vehicles, and diesel-engine generators. The use of diesel fuel in these larger vehicles and machinery is due to the higher efficiency of the diesel cycle compared to the Otto cycle of the petrol engine.
In summary, diesel fuel has a higher energy density than gasoline, making it the preferred choice for heavy machinery and vehicles requiring more torque. This higher energy density, combined with the larger engine size and higher compression ratio, results in diesel engines being more fuel-efficient and better suited for heavy-duty applications.
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Diesel engines have higher fuel prices
Diesel fuel is any liquid fuel designed for use in a diesel engine, which is a type of internal combustion engine. Diesel engines are more fuel-efficient than gasoline engines, with up to 40% more efficiency than spark-ignited petrol engines with the same power output. Despite this, diesel fuel prices are often higher than those of gasoline. This can be attributed to various factors, including federal, state, and local taxes, as well as transportation and delivery costs.
Federal, state, and local taxes influence fuel prices, and diesel fuel is typically subject to a higher federal tax than gasoline in the US. This automatically leads to increased diesel prices for consumers. Additionally, transportation costs play a significant role in diesel fuel pricing. The retail price of diesel fuel reflects local market conditions, including the distance between the retail location and the sources of supply. Areas farthest from the Gulf Coast, a major source of US diesel fuel production, tend to have higher diesel fuel prices due to increased transportation costs.
Market conditions and local factors also impact diesel fuel prices. The cost of doing business, including overhead, local real estate costs, and taxes, varies depending on the dealer's location. Even neighbouring retail stations can have different traffic patterns, costs, and sources of supply, leading to price variations. The number and location of local competitors can also affect prices, with high-volume truck stops selling diesel fuel at lower prices than smaller-volume service stations.
Regional demand and supply of diesel fuel, as well as disruptions in the supply chain, can cause price fluctuations. For example, diesel fuel prices on the West Coast, particularly in California, are higher due to taxes and supply issues. California's liquid fuels market is relatively isolated and largely supplied by in-region refinery production, making it costly to transport supply from outside the region during refinery outages.
The refining costs of diesel fuel also contribute to its higher price. Environmental laws and regulations require more expensive refining processes to maintain low air pollution levels. Additionally, producing ultra-low sulfur diesel fuel (ULSD) necessitates additional refining processes, further increasing costs.
While diesel fuel prices may be higher, it's important to consider the bigger picture. Diesel engines offer higher fuel efficiency, resulting in lower lifelong costs compared to gasoline-powered vehicles. They also have improved torque and acceleration power, making them a preferred choice for long-distance drivers and those seeking higher mileage and reduced repair expenses.
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Diesel engines have higher fuel efficiency
Diesel engines are widely recognised for their efficiency and reliability under heavy loads. They are the top choice for industries that rely on long-haul drives and high-torque applications. Diesel engines have an average fuel efficiency of 20–35% more than older engines once they have been broken in.
The fuel density of a diesel engine can be 13–18% more than a gasoline engine. Diesel fuel contains about 15% more energy by volume than gasoline. Accounting for the difference in energy density, the overall efficiency of the diesel engine is still some 20% greater than gasoline. This is because diesel has a thicker density, allowing it to produce more energy with less fuel.
The diesel engine's higher compression ratio is directly related to its thermal efficiency. The higher the compression ratio, the better the fuel will burn. This means more explosions will occur, and more energy will be produced. However, gasoline engines perform better in start-and-stop traffic and without a load.
Diesel engines are also more durable than gasoline engines. Diesel engines can operate for many more miles than gasoline engines before needing maintenance and repair. This makes diesel engines ideal for vehicles that need to run at idle for hours.
While diesel engines are more fuel-efficient, they tend to be heavier and more expensive than gasoline engines. Diesel engines also have lower maximum RPM ranges than gasoline engines.
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Frequently asked questions
Diesel fuel is denser than gasoline, but it has the consistency of light oil. Diesel engines are larger and heavier than gasoline engines.
Diesel fuel, also called diesel oil, is a combustible liquid obtained from the distillation of crude oil. It is used in diesel engines, which are a type of internal combustion engine.
Engine oil is a general term for any oil designed for use in engines. It can be used to lubricate and protect engine components.
No, diesel fuel and engine oil are different. Diesel fuel is a type of fuel specifically designed for use in diesel engines, while engine oil is a broader term that can refer to a variety of oils used in engines.
