AirWare On-line Reference Manual
| | Release Level | 5.4 |
| | Release Date | 2008 10 |
| Revision Level | 1.0 |
|
Last modified on:
Monday, 20-Jul-09 14:03 CEST
|
Fleet composition
Fleet compositions are named OBJECTS in AirWare.
They are specified for all line sources in the overall doamin:
To estimate emission from traffic, several components are required:
- traffic frequencies (number of vehicles pasing a segment per unit of time)
- average speed of traffic (km/hour)
- fleet composition.
- cold start fraction and road type dependent
emission factors
for each pollutant considered.
A fleet composition OBJECTS consistes of the relative share (number of vehicles)
for any user defined set of classes, for example:
- Gasoline Passenger cars
- Diesel Passenger cars
- LPG Passenger cars
- Gasoline Light Duty vehicles
- Diesel Light Duty vehicles
- Heavy Duty vehicles
- Urban Busses
- Coaches
- Motorcycles
- Other (new technologies).
The set of vehicle classes is user defined: a Descriptor vehicle_classes
in the Knowledge Base contains the list of classes to be considered
in the fleet composition and in the emission factor table.
The fleet composition object consistes of the standard object header and META DATA,
and a table of relative shares (in % of vehicles) that should sum to 100%
The fleet composition is global;
alternative fleet compositions can be selected at the level of
emission scenarios.
