Mercedes Mullins
The amount of carbon dioxide emitted per gallon of jet fuel burned is an important factor in understanding the environmental impact of air travel. Carbon dioxide emissions from jet fuel combustion contribute to climate change and have long-lasting effects on the atmosphere. Various factors influence the calculation of carbon dioxide emissions per gallon of jet fuel burned, including the type of aircraft, engine, flight distance, and fuel consumption. Additionally, upstream production emissions, such as those from the refinement and transport of jet fuel, add to the overall carbon footprint. Understanding these factors is crucial for passengers, airlines, and policymakers to make informed decisions and mitigate the environmental impact of air travel.
| Characteristics | Values |
|---|---|
| CO2 emissions during the production of kerosene | 0.5 kg CO2 per kg of jet fuel |
| CO2 emissions of a flight | directly related to the amount of kerosene jet fuel burnt |
| Jet fuel consumption | varies by aircraft model and engine type |
| Flight distance | an essential factor in determining jet fuel consumption |
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What You'll Learn
- CO2 emissions are directly related to the amount of jet fuel burnt
- Jet fuel consumption varies by aircraft model and engine type
- Flight distance impacts fuel consumption: longer routes require more fuel
- Takeoff and landing demand higher fuel burn rates than level flight
- Jet fuel production adds 0.5 kg CO2 per kg of jet fuel
CO2 emissions are directly related to the amount of jet fuel burnt
The impact of jet fuel combustion on the environment is significant. Carbon dioxide has a long-lasting presence in the atmosphere, with about half of the emissions being absorbed by oceans and forests within 30 years, 30% removed within a few hundred years, and the remaining 20% persisting for thousands of years. Furthermore, the release of CO2 at high altitudes, such as during aircraft flights, is believed to have a greater greenhouse effect than CO2 emitted at sea level. This is due to the formation of contrails and cirrus clouds, which absorb solar radiation and contribute to warming the planet.
Flight distance is a crucial factor in determining jet fuel consumption. Longer routes generally require more fuel, but shorter routes with multiple takeoffs and landings can also be less efficient due to the higher fuel burn rates during these phases of flight. The type of aircraft also influences fuel efficiency, with short-haul planes like the Boeing 737-400 having different fuel consumption rates than long-haul aircraft like the Boeing 747-400.
Calculating the carbon dioxide emissions of a flight is relatively straightforward. One method is to estimate the fuel consumption per flight, taking into account factors such as distance, taxiing, take-off, cruising, landing, and seating capacity. By multiplying the fuel consumption by the emission factor of jet fuel, we can determine the total CO2 emissions for a flight. Additionally, we can calculate emissions on a per-passenger basis by considering factors like seat occupancy and average flight duration.
While regulatory systems like the EU ETS aim to reduce CO2 emissions from aviation, they do not account for the full impact of jet fuel combustion at high altitudes. The overall climate effect of flying is likely greater than just the CO2 emissions, and addressing this challenge will require a comprehensive approach that considers not only the fuel burned but also the unique atmospheric conditions associated with air travel.
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Jet fuel consumption varies by aircraft model and engine type
Jet fuel consumption depends on a multitude of factors, including the aircraft's model, engine type, empty weight, carried payload, flight path, and weather conditions. The type of fuel used also varies, with Jet A and Jet A-1 being kerosene-based fuels used in turbine engine airplanes, and aviation gasoline (AVGAS) being used in small piston-engine planes.
The Airbus A350, considered one of the most fuel-efficient widebody aircraft, consumes around 38 lb of fuel per nautical mile, or about 17,000 gallons for a flight between New York and London of just over 3,000 nautical miles. This equates to approximately 2,400 gallons per hour for a seven-hour flight. The Boeing 787-9 has a similar fuel consumption rate, burning roughly 2,700 gallons per hour.
The Airbus A380, the world's largest jet airliner, burns an average of 4,600 gallons of fuel per hour. This is a 20% increase in per-passenger fuel efficiency compared to the older 747. The A380 can carry over 800 passengers at maximum capacity, which significantly impacts fuel efficiency.
The Bombardier Dash 8 Q400 turboprop is used as a regional airliner due to its optimum speed and fuel efficiency. Jet fuel costs and emissions reduction have led to a renewed interest in the propfan concept for jetliners, with Airbus patenting aircraft designs with twin rear-mounted counter-rotating propfans.
Over time, aircraft have become more fuel-efficient. From 1968 to 2014, the average fuel burn of new aircraft fell by 45%, with a compounded annual reduction of 1.3%. Improvements in aircraft configuration, aerodynamics, and engine efficiency have contributed to this progress. For example, winglets on large commercial jets like the Boeing 737-800 can increase efficiency by up to 6.69%.
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Flight distance impacts fuel consumption: longer routes require more fuel
The distance travelled by an aircraft is a significant factor in determining its fuel consumption. Longer routes inevitably require more fuel, and this relationship is not linear; as distance increases, the fuel efficiency changes. For instance, a Boeing 747 uses approximately 1 gallon (4 litres) of fuel every second, or 36,000 gallons (150,000 litres) over a 10-hour flight. This equates to 5 gallons of fuel per mile (12 litres per kilometre).
However, when considering the number of passengers, the fuel efficiency per person increases. A 747 can carry up to 568 passengers, and if we assume 500 passengers for simplicity, the plane is getting 100 miles per gallon (42 kilometres per litre) per person. This is significantly better than a typical car, which gets about 25 miles per gallon. For example, a car journey from New York to Los Angeles, a distance of 2,797 miles, would require 112 gallons of fuel, or 56 gallons per person assuming two passengers.
The fuel efficiency of aircraft over different distances is complex. While longer flights require more fuel overall, the efficiency per nautical mile can improve. For instance, a study of domestic flights in Turkey found that the average fuel consumption increased by 5.1 kg for each additional nautical mile. However, the shortest route had an intensity of 112 gr/pa-NM, while the longest route was 207 gr/pa-NM, showing that longer flights can be more efficient per mile. This is because, on shorter flights, the fuel used for takeoff is a much larger proportion of the total fuel used, and less fuel-efficient planes are often used on these routes.
Aircraft design also plays a role in fuel efficiency over different distances. For instance, Airbus has introduced wingtip fences and Sharklet blended-winglets, which add weight but offer a fuel burn reduction of 3.5% on flights over 2,800 km. This technology has a wide range of effectiveness depending on the route and aircraft, with fuel savings ranging from 0.2% to 10.75%. Additionally, designing aircraft for subsonic rather than transonic speed, with turboprop instead of turbofan propulsion, could save up to 21% of fuel.
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Takeoff and landing demand higher fuel burn rates than level flight
The takeoff and climb stages of a flight burn fuel at the highest rate per minute. Engines work the hardest during these phases, producing the thrust needed to overcome gravity and ascend to cruising altitude. The shorter duration of these stages compared to the cruise segment keeps their overall fuel consumption lower. However, the fuel used for takeoff is relatively large compared to the amount expended in the cruise phase. This is especially true for short-haul flights, where takeoff and landing make up a larger proportion of the overall flight, making them less efficient in terms of fuel consumption per kilometre.
The weight of the aircraft and its payload significantly affect fuel consumption. Heavier takeoff weights require more thrust, increasing the burn rate during takeoff and climb. Airlines calculate fuel loads to balance efficiency and range, as a longer range requires a larger fuel fraction of the maximum takeoff weight, adversely affecting efficiency. The weight of the payload, including passengers, luggage, and cargo, also contributes to the total weight of the flight, influencing fuel efficiency.
Altitude is another crucial factor in fuel efficiency. Higher altitudes generally provide better fuel efficiency due to thinner air, reducing drag on the aircraft. However, aircraft engines produce less thrust at higher altitudes, so the optimal altitude for fuel efficiency is where the aircraft can maintain sufficient lift while minimising drag. Deviations from the optimal altitude due to air traffic constraints or weather conditions can lead to increased fuel consumption.
Other factors that impact fuel burn rates include flight distance, aircraft maintenance, and routing. Longer flights may require additional fuel, leading to higher fuel consumption and, in some cases, the need to stop halfway to refuel. Well-maintained engines operate more efficiently, reducing unnecessary fuel burn. Efficient routing can also save fuel, as flying at the optimal speed and altitude can significantly impact fuel efficiency.
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Jet fuel production adds 0.5 kg CO2 per kg of jet fuel
The combustion of jet fuel is a significant contributor to CO2 emissions, with approximately 3.16 kg of CO2 released for every kilogram of jet fuel burned. However, the impact of jet fuel on CO2 emissions extends beyond combustion. The production, transportation, and refining processes associated with jet fuel also contribute significantly to its carbon footprint. On average, these processes add approximately 0.5 kg of CO2 for every kilogram of jet fuel produced. This means that for every kilogram of jet fuel, we can attribute 3.66 kg of CO2 emissions when considering both combustion and production.
The accumulation of CO2 in the Earth's atmosphere has far-reaching consequences. CO2 acts as a greenhouse gas, trapping heat and contributing to the global warming effect. Since the Industrial Revolution, the Earth's temperature has risen by a little more than 1 degree Celsius. While this may seem insignificant, it has already led to regional and seasonal temperature extremes, reduced sea ice, intensified rainfall and drought, and altered habitat ranges for various species.
The impact of jet fuel combustion on CO2 emissions is particularly notable in air travel. Aircraft rely primarily on the combustion of jet fuel for propulsion, and the burning of this fuel releases a substantial amount of CO2 into the atmosphere. Additionally, the warming effect of CO2 is amplified when emitted at high altitudes, as is the case with aircraft emissions. This heightened effect has led to growing calls for individuals and companies to voluntarily reduce their air travel to mitigate their climate footprint.
While jet fuel production contributes a smaller amount of CO2 compared to combustion, it is still a significant factor in the overall carbon footprint of jet fuel. The processes involved in extracting, refining, and transporting jet fuel all require energy, often derived from fossil fuels, which results in CO2 emissions. These emissions occur upstream of the actual fuel combustion and are often overlooked or underestimated.
Understanding the full lifecycle impact of jet fuel, from production to combustion, is crucial for developing effective strategies to reduce its carbon footprint. By acknowledging the significant contribution of jet fuel to CO2 emissions, individuals, industries, and governments can make informed decisions to mitigate climate change. This may include exploring alternative fuel sources, improving fuel efficiency, or implementing carbon offsetting programs to reduce the overall environmental impact of jet fuel usage.
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Frequently asked questions
Burning jet fuel emits around 3.15 grams of CO2 per gram of fuel burned.
A round trip from Frankfurt to New York burns about 156,500 kg of jet fuel, producing about 570 tonnes of CO2.
Longer flight distances generally require more fuel. However, shorter routes may be less efficient if they involve multiple take-offs and landings, which have higher fuel burn rates.
The amount of CO2 emitted per passenger can vary depending on the flight and aircraft type. Estimates range from 870 kg CO2 per economy-class passenger on a round trip from Frankfurt to New York to around 90 kg CO2 per passenger per hour on a Boeing 737-400 or 747-400.
Aviation emissions, including the combustion of jet fuel at high altitudes, have a more significant greenhouse effect than CO2 released at sea level. Additionally, contrails and cirrus cloud formation can further enhance the climate effect of flying.
