In Visum the emission calculation according to COPERT determines the desired emissions and optionally cold start excess emissions. The traffic situation, volumes and fleet compositions are taken into account. The calculation is simplified compared to HBEFA, as fewer input parameters are used. The key indicators are the speeds driven, volumes, and fleet compositions.
Emissions are calculated on the basis of links in Visum. Emissions are not calculated for turns, main turns, and connectors.
To calculate emissions according to COPERT, you must first define your desired fleet compositions. The calculations on the basis of the COPERT data are based on the proposed COPERT fleet compositions for each country, calendar year, and category (e.g. cars, HGVs). Fleet compositions must also be created for user-defined vehicle strata, which may also contain COPERT vehicle strata or COPERT fleet compositions in addition to the user-defined vehicle strata.
Then, the emissions are calculated with the COPERT-based emission calculation procedure, which can be run for either one or several demand segments at the same time.
The procedure can be calculated in two different ways:
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statically (for analysis period and analysis horizon)
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dynamically (additionally per analysis time interval)
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Note: You can calculate the dynamic variant, if volumes are available for individual analysis time intervals. |
Per demand segment, the volumes for warm emissions and cold start excess emissions stem from a selectable attribute. This attribute is interpreted as volume with a time reference analysis period (AP). When calculating with AP-based volumes, the value is divided by the AP projection factor and multiplied by the AH projection factor.
Fuel consumption is shown in units of megajoules using the emission factors [MJ/km]. In addition, the fuel consumption is calculated in units of mass and the specific fuel consumption in units of l/100km for vehicle strata that use gasoline or diesel. The basis for this calculation is the specified fuel per vehicle stratum and the ratio of mass and density per fuel.
