Scenario

If we replace all midsized

airplanes(Airbus 320 and Boeing 737) with

Boeing 787, how much Energy will be saved

and how much CO2(gm) emission will be

reduced every year?

Airbus a320 vs Boeing 737 vs Boeing 787

▷ Aviation industry’s turnover is increasing 20% per year from the last two decades.

▷Focus on emissions of atmospheric

pollutants such as NOx during the landing and take-of cycle and cruising stage

▷Only CO2 emissions are discussed because the exhaust of modern aircrafts has little N2O and CH4

▷Aviation gasoline and Jet Fuel and Kerosene were widely used . Consequently, CO2 emissions from the combustion of these types of fuel are being analysed in our scenario.

Most (90%) CO2 emissions occur in the cruising stage [IPCC, 2006], and the CO2 emissions in the LTO stage are difficult to be estimated because many factors such as aircraft type, equipped engine type, and operation condition of engines affect the emissions

Energy Information Association of US, the emission coefficient of greenhouse gases for certain type of fuel is listed. Among the fuels which associated with aviation are:

Aviation Gasoline: 18.355 pounds CO2 per gallon or 2.199 kg CO2 per litre.Jet Fuel: 21.095 pounds CO2 per gallon or 2.527 kg CO2 per litre.Kerosene: 21.537 pounds CO2 per gallon or 2.580 kg CO2 per litre.

Airbus A320▷ Cruising speed = 853

km/h

▷ Fuel consumption = 3025 L/h

▷ Passenger capacity = 150 (max)

▷ Fuel consumption per km =

▷ 3025 ÷ 853 = 3.546 L/km

▷ Thus, CO2 emission rate =

▷ 3.546 x 2.580 = 9.149 kg/km

Boeing - 737▷ Cruising speed =

809 km/h

▷ Fuel consumption = 2377 kg/h or 2935 L/h (kerosene density = 0.81 kg/L)

▷ Passenger capacity = 168 (max)

▷ Fuel consumption per km = 2935 ÷ 809 = 3.628 L/km

▷ Thus, CO2 emission rate = 3.628 x 2.580 = 9.360 kg/km

Boeing – 787▷ Cruising speed =

913 km/h

▷ Fuel consumption = 2086 kg/h or 2576 L/h (kerosene density = 0.81 kg/L)

▷ Passenger capacity = 250 (max)

▷ Fuel consumption per km = 2576 ÷ 913 = 2.821 L/km

▷ Thus, CO2 emission rate = 2.821 x 2.580 = 7.266 kg/km

Boeing 787 Composition

The combination of lighter weight materials and innovative structural technologies result in lower weight airframes and, therefore, lower fuel consumption.

More recent technological developments have increased the use of composite materials to over 50 per cent by weight in the latest aeroplane designs