FALL/WINTER 2005-06 — Systems Assessment
GREET 1.7 Beta Version Is Available
A new Greenhouse gases, Regulated Emissions, and Energy use in Transportation (GREET) update - GREET 1.7 Beta version - can now be downloaded from Argonne's transportation web site free of charge. This fuel-cycle model allows researchers and analysts to evaluate various vehicle and fuel combinations on a full fuel-cycle basis. The latest version represents significant modifications of GREET programming and expansion of GREET fuel production pathways and vehicle/fuel technologies options. In particular, GREET 1.7 is designed to simulate vehicle/fuel options for a given year between 1990 and 2020. It has the ability to generate the results of a group of production pathways for a given fuel with a single GREET run. GREET 1.7 includes more than 70 vehicle/fuel system options and more than 85 fuel production pathways for simulations.
With these newly added features, users can conduct well-to-wheel (WTW) simulations for given years over a period of time and for many fuel production options, especially those for hydrogen (H2) production. In addition, GREET 1.7 is designed for stochastic simulations to address uncertainties without relying on commercial software (as was the case for GREET 1.6).
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Well-to-Wheel Analysis in the GREET Model |
Since the release of GREET 1.6 in 2001, Argonne's CTR has continued to upgrade and update the GREET model through the following major research efforts. Argonne worked with General Motors Corporation to thoroughly examine criteria pollutant emissions. Argonne also updated ethanol pathway simulations with newly available data from industry. With U.S. Environmental Protection Agency (EPA) and U.S. Department of Energy (DOE) support, Argonne developed new GREET programming features to incorporate GREET into EPA's MOVES model. Argonne examined various hydrogen production pathways for applications in internal combustion engines and fuel cells. The results of these efforts have been incorporated into the GREET 1.7 Beta version.
Recent accomplishments with the GREET model include:
- Phase 1 and 2 WTW analysis reports with General Motors Corporation in 2001 and 2005. While the Phase 1 report relied on GREET 1.6, through the Phase 2 study effort, the GREET model was upgraded and updated for simulations of criteria pollutant emissions.
- Incorporation of the GREET model into EPA's MOVES model. The MOVES/GREET system encompasses the tools, algorithms, underlying data, and guidance necessary for use in furthering R&D in new fuels and advanced vehicle technologies and developing national/regional emission inventory projections. It seamlessly integrates GREET's Well-to-Pump results with MOVES' Pump-to-Wheels capabilities. (See accompanying schematic.)
- Energy and emissions results of fuel ethanol (see related article and presentation). The results of Argonne's ethanol analysis - like those of many other recently completed ethanol studies - reveal that corn-based ethanol achieves energy and greenhouse gas emission-reduction benefits relative to gasoline.
Sponsor
Cosponsored by the Office of Planning, Analysis, and Evaluation; FreedomCar and Vehicle Technologies Program; Hydrogen, Fuel Cells, and Infrastructure Technologies Program; and Biomass Program, all of which are under the Office of Energy Efficiency and Renewable Energy, the U.S. Department of Energy
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