Online GHG Calculator for Heavy-Duty Vehicles
In 2012, the Georgia Tech research team developed the Transit Fuel and Emissions Calculator (FEC) for the Federal Transit Administration. The FEC represents the first load-based life-cycle energy and emissions model for transit buses and rail technologies that is capable of evaluating energy and emissions savings for criteria pollutants and greenhouse gases (GHG). The FEC can also be used to estimate the cost-effectiveness per ton of emissions saved. The current open-access FEC for transit has also been adapted for use with clean truck and freight operations strategies. The team has been transitioning this spreadsheet-based model to a Python-based online system that will be launched in Fall 2017.
The model integrates elements of the US DOE’s GREET model and the US EPA’s MOVES model so that energy use and emissions can be estimated for the entire energy lifecycle (well-to-pump and pump-to-wheel). Hence, the model accounts for energy, emissions, and costs of the source of the fuel, as well as the use of the energy at the vehicle. With regard to technologies, the model is being expanded to integrate combinations of truck classes, drivetrains, fuels, and vehicle design elements that affect fuel consumption. Vehicle technologies, such as aerodynamic improvements, low rolling resistance tires, hybrid and electric powertrains, alternative fuels and electrification can also be evaluated with the updated FEC. The resulting model will also be sensitive to on-road truck operating characteristics that affect engine load and power demand. Hence, the FEC can be used to evaluate the impacts of operations strategies and infrastructure improvements that reduce ton-miles of transport, reduce idling activities, and decrease stop-and-go movements. The FEC is also amenable to the assessment of hybrid and electric vehicle operations, electrification of port operations, and other technology-oriented strategies that traditional models have not been able to easily evaluate.