I am trying to study the fuel demand and emissions from road transport vehicles. I have collected data on vehicle number by different fuel type, its fuel consumption (fuel economy), occupancy rate, average annual distance travelled. For my demand structure, do I use number of vehicles as the unit for the sector or passenger-km? Which one would be more useful in doing scenario analysis for exploring fossil fuel reduction and emission reduction?

Appreciate your help.

Regards

Ravita

Have a look at this training presentation (Pierpaolo Cazzola and Jacob Teter. "Energy Analysis
and Modelling Transport", IEA Energy Training Week, June 6 - 10 2016.). The first half, in particular, contains some good information about how transportation energy and emissions analysis.

Passenger-km provides a more physical description of the demand for energy services which must be satisfied. In other words, passengers require the ability to move from A -> B (the service that is provided by transport technologies). They do not require the technology that provides that service, which has no intrinsic value other than its ability to meet passenger-km requirements.

Taylor

Thank you for this information. Will read through the presentation given. If any queries, will post again.

Regards

Ravita

I am working on Sea Transport Sector at the moment. I have collected information on the annual distance travelled, passenger transported per trip, load transported per trip, fuel used annually from different types of shipping vessels. I have some vessels which carry passengers and cargo simultaneously. In my model, I have set activity level unit at pkm. Any suggestions on how I can include the cargo transported in my model?

Appreciate your help.

Regards

Ravita

In a situation in which you have both cargo and people transported, what is the primary driver of the energy consumption? If it is the demand for passenger transport, then increasing or decreasing the amount of cargo on the ship will not really impact its energy consumption** - it would have taken the journey anyways, regardless of the amount of cargo being transported. In this way, the transportation of cargo does not give rise to any energy demands, and so it can be left out of the model.

However, if the purpose of the transport ships is equally cargo and passengers (even if they are sometimes transported on the same vessel), you could approach this another way by combining the mass of the passengers and the mass of the cargo. The energy intensity would then be expressed as an energy per kilogramme-kilometer of cargo *or* passenger, and final energy consumption would change in accordance with changes to either cargo or passenger demand, or both. This would of course require you to assign an average mass per passenger.

Hope this is useful,

Taylor

(** Aside: Assuming that the amount of additional cargo weight is not so significant that the vessel actually requires more fuel to make the same journey)