Modeling CO2 emissions in Transportation Optimization
You can specify CO2 emission information for the assets used in Transportation Optimization. This information can then be used to calculate CO2 emissions per segment on a route based on the weight of the vehicle and the shipments loaded per segment. The emissions data is valuable in performing analysis on the CO2 impact of different fleet designs. For example, your 48 foot vehicles may have higher emissions than the 20 foot vehicles, but the total emissions will also depend on the number of routes, total weight and total distance calculated.
CO2 data is included with the application in a table that defines the kilogram per ton mile emissions for a number of different vehicle types.
CO2 input
To model CO2 emissions in Transportation Optimization, you populate columns on the Transportation Assets table:
| Column | Description |
| Asset Weight |
This is the weight of an empty vehicle, also known as the “tare” weight. This weight enables Transportation Optimization to determine the CO2 emissions on segments of a route where the vehicle empty. Default value: 35000 |
| CO2 |
In this column, set the CO2 emissions for this transportation asset based on the CO2 Basis. This is the emission amount per weight unit assumed in your model. For example, if .04 is entered, then this is .04 kg of CO2 per one unit of weight (Ton, by default) of product moved over one distance unit by this transportation asset. Default value: 0 You cannot use a scenario item to change the value of CO2 for use with Transportation Optimization. The CO2 calculation is a post-process operation that is not affected by scenario changes.
|
| CO2 Basis |
Use this column to select the basis for determining CO2 emissions. Transportation Optimization uses Weight-Distance; the other values shown are currently not implemented for this solver: Weight-Distance – CO2 * Weight * Distance Default value: Weight-Distance |
Calculating the CO2 emission
Transportation Optimization calculates the CO2 emission for the individual segments on the route. For each segment, the vehicle may be empty, or it may have one or more shipments on board. First, the shipment weight onboard is calculated per segment:
Weight onboard = (weight of shipments loaded - weight of shipments unloaded)
This weight is then added to the tare weight of the vehicle and multiplied by the CO2 value from the Transportation Asset table to get the CO2 emission per distance unit:
CO2 per distance unit = (weight onboard + tare weight of vehicle) * CO2
Finally, the CO2 per distance unit is multiplied by the distance traveled on the segment:
CO2 emission per segment = CO2 per distance unit * distance traveled
CO2 output
The CO2 emissions are reported in the Route Summary and Segments tables:
| Table | Column | Description |
| Route Summary | CO2 Emission | Displays the total CO2 emission incurred on the route. This is the sum of the CO2 emissions calculated for all the segments on the route. |
| Segments | CO2 Emission |
Displays the CO2 emission incurred on the segment. The emission is calculated as: ((tare weight of vehicle + weight of shipments onboard) * CO2 factor) * distance traveled The CO2 factor is defined on the Transportation Assets table. |
Last modified: Wednesday May 15, 2024