We are running calculations on carbon dioxide and methane emissions from the transport sector using the transport analysis. From the help section under transport analysis calculations, emissions are computed using the formula

Emissions = EnergyConsumption x EmissionFactor

where energy consumption is given by

EnergyConsumption = Stock x Mileage x FuelEconomy.

We used the units in km, km/li, and kg/TJ for the mileage, fuel economy, and the emission factor. Using these for the formula, we would get units in li-kg/TJ. When the results were displayed, emissions were in kg or in MT. We thought that maybe some factors like the energy content and the density of the fuel are also used in getting the emissions. Can anybody help clarify whether calculations in LEAP really use other factors like these in the computations?

Thanks,

Cam

In the Energy Consumption equation, the units for Fuel Economy are fuel use per unit of vehicle distance traveled (i.e. liters/km). If you enter the Fuel Economy in km/liter, the Energy Consumption equation becomes:

Note that to convert the units of energy consumption from units of volume (in this case, liters) to units of energy, LEAP uses the Net Energy Content for a given fuel as specified in the Fuels dialog box (accessed from the main menu through General: Fuels).

For more information on the transport calculations, refer to the following help page:

Hope this helps!
Emily