Car
The GHG-emissions of cars are calculated based on following assumptions:
- GHG-emissions of cars are mainly referred to their use phase,
therefore production and end of life aspects are not considered.
- The GHG-emissions are calculated from a user defined fuel efficiency and the travelled distance.
If the fuel efficiency is unknown a reference value is proposed based on the selection of the car class and the fuel type.
- GHG-emissions from fuel production are in either case based on German, European, or US data,
linked with the selection of a country. If no data is available EU-values are assumed.
The calculator determines the burnt fuel mass from efficiency and distance.
Subsequently GHG-emissions from the fuel production and combustion are calculated.
Train
The GHG-emissions of trains are calculated using the following assumptions and data:
- GHG-emissions of trains are mainly referred to their use phase,
therefore production and end of life aspects are not considered.
- The calculations are based on publications for energy consumption and
workload provided by the Deutsche Bahn AG
- A specific grid mix form Deutsche Bahn AG is used
The calculator uses selected the train type and linked data to calculate the used energy.
Subsequently it calculates the GHG-emissions using the specific grid mix.
Plane
The GHG-emissions of planes are calculated using the following assumptions and data:
- GHG-emissions of planes are mainly referred to their use phase,
therefore production and end of life aspects are not considered.
- The calculation of the fuel consumption is based on
EMEP/CORINAIR Emission Inventory Guidebook 2005 - Air Traffic
- The calculator uses an approximation curve to calculate the burnt kerosene mass.
- Additionally a separate LTO (landing take off) consumption is assumed.
- The GHG-emissions from the kerosene combustion are multiplied with a RFI-factor of 2.7
- The provision of fuel is linked to the country where the plane takes off.
- GHG-emissions are calculated from value for Germany, Europe or the US.
For all other countries European values for fuel provision are assumed.
The calculator uses a sample plane, and an estimated workload (wl) for each flight type.
- Domestic flights - Boeing 737 - wl=70%
- Intracontinental flights - Airbus A320 - wl=75%
- Intercontinental flights - Boeing 747 - wl=85%
It calculates the fuel mass per passenger.
Subsequently the GHG-emissions from kerosene combustion and provision are calculated.
It is important to enter only data for single flights,
because the LTO consumption has to be added to each flight.
