The GREET Model Expansion for Well-to-Wheels Analysis of Heavy-Duty Vehicles

Cai, Hao; Burnham, Andrew; Wang, Michael; Wen, Haiying; Vyas, Anant

doi:10.2172/1212730

Cited by 14 publications

(13 citation statements)

References 71 publications

(135 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…CO 2 emissions from combusting gasoline and diesel fuels occur in transporting corn from farm to refinery, ethanol from refinery to retail station, and co-products from refinery to end users. While this category accounts for 5-6% of ethanol's GHG profile, transportation vehicles and systems have become more fuel and GHG efficient since 2010 [36].…”

Section: Fuel and Feedstock Transportmentioning

confidence: 99%

“…Our method is similar to that of the RIA but incorporates updated assumptions, transportation mode and distance traveled data, and EFs from GREET 2015. Relative to GREET 2009, GREET 2015 includes: (1) new LCA EFs for five types of diesel and gasoline freight vehicles; (2) new transportation mode and distance traveled data for ethanol moving from refinery to blending terminal and from blending terminal to retail station; and (3) new life-cycle freight EFs for rail, barge, and truck [36]. For corn oil, transportation emissions reflect the same emissions per ton-mile as for DGS.…”

Section: Fuel and Feedstock Transportmentioning

confidence: 99%

See 1 more Smart Citation

The greenhouse gas benefits of corn ethanol – assessing recent evidence

et al. 2019

View full text Add to dashboard Cite

In 2010, the U.S. Environmental Protection Agency (EPA) released a life-cycle analysis of the greenhouse gas (GHG) emissions associated with the production and combustion of corn ethanol. EPA projected that by 2022, the emissions profile of corn ethanol from a new refinery would be 21% lower than that of an energy equivalent quantity of gasoline. Since 2010, the 21% value has dominated policy discussions and federal regulations related to corn ethanol as a renewable fuel and a GHG mitigation option. It is now 2018 and new data, scientific studies, technical reports, and other information allow us to examine the emissions pathway corn-ethanol has actually followed since 2010. Using this information, we assess corn ethanol's current GHG profile at 39-43% lower than gasoline. We also develop two projected emissions scenarios for corn ethanol in 2022. These scenarios highlight opportunities to produce ethanol with emissions that are 47.0-70.0% lower than gasoline. Many countries are now developing or revising renewable energy policies. Typically, biofuel substitutes for gasoline are required to reduce GHG emissions by more than 21%. Our results could help position U.S. corn ethanol to compete in these new and growing markets.

show abstract

Section: Fuel and Feedstock Transportmentioning

confidence: 99%

Section: Fuel and Feedstock Transportmentioning

confidence: 99%

The greenhouse gas benefits of corn ethanol – assessing recent evidence

et al. 2019

View full text Add to dashboard Cite

show abstract

“…New methane emissions data GHG emissions, including CO 2 and methane, can be estimated for compressed natural gas (CNG) and liquefied (LNG) vehicles using models such as Greenhouse Gases, Regulated Emissions, and Energy Use in Transportation (GREET; Cai et al, 2015). Prior to GREET 2016, methane emissions data were not updated to reflect most recent vehicle technologies (Wang and Burnham, 2016).…”

Section: Methodsmentioning

confidence: 99%

“…Only recent studies have focused on unregulated GHG emissions from currenttechnology vehicles, and those focused specifically on tailpipe-only emissions (Thiruvengadam et al, 2016). In fact, Argonne National Laboratory reported, "Limited publicly available data on total vehicle (or crankcase) methane emissions are available" (Cai et al, 2015). Given that the current percentage of the NG HD fleet and infrastructure is small, but growth predictions are high, this study focused on methane emissions from recent technologies and current practices, which could provide insight into future methane emissions predictions.…”

Section: Introductionmentioning

confidence: 99%

Future methane emissions from the heavy-duty natural gas transportation sector for stasis, high, medium, and low scenarios in 2035

Clark

Johnson

McKain

et al. 2017

Journal of the Air & Waste Management Association

View full text Add to dashboard Cite

Newly collected pump-to-wheels methane emissions data for current natural gas technologies were combined with future market growth scenarios, estimated technology advancements, and best practices to examine the climate benefit of future fuel switching. The analysis indicates the necessary targets of efficiency, methane emissions, market penetration, and best practices necessary to enable a pathway for natural gas to reduce the carbon intensity of the heavy-duty transportation sector.

show abstract

“…On-road medium-duty (MD) and heavy-duty (HD) diesel trucks are a significant workforce for the trucking industry and are deployed in a wide range of vocational applications such as refuse trucks, port delivery, transit buses, construction, local delivery and long haul goods movement (Cai et al, 2015;Scora et al, 2019). The variety of vocations include highly diverse engine operating conditions to meet the applicational objective.…”

Section: Introductionmentioning

confidence: 99%

Development of an Activity-based Windowing Approach to Evaluate Real-World NOx Emissions from Modern Medium and Heavy-Duty Diesel Trucks

Pondicherry¹

View full text Add to dashboard Cite

Development of an Activity-based Windowing Approach to Evaluate Real-World NOx Emissions from Modern Medium and Heavy-Duty Diesel Trucks The introduction of in-use emissions regulations by the United States Environmental Protection Agency (U.S.EPA) requires medium-duty (MD) and heavy-duty (HD) engine manufacturers to demonstrate emissions compliance during in-fleet operation. In the United States (U.S.), the Not-to-Exceed (NTE) method is used to evaluate real-world emissions compliance from on-highway MD and HD trucks. Regulatory agencies, engine manufacturers and research entities have identified that the NTE method incorporates numerous exclusions and evaluates emissions compliance only under selective operating conditions that are favorable for the selective catalytic reduction (SCR) system to reduce oxides of nitrogen (NOx) emissions efficiently. Such operation is typically encountered only by vocations that experience sustained highway driving operation, which is not entirely representative of actual highly diverse real-world operation experienced by the engine/aftertreatment system. Evaluation of real-world driving emissions (RDE) plays a critical role in monitoring and ensuring the performance of emissions control systems. Portable emissions measurement system (PEMS) serves as a robust tool to assess emissions levels during real-world operation. However, utilization of PEMS for large-scale deployment is time-consuming, labor-intensive, and expensive. As a vision of potential elements for a next-tier of in-use NOx monitoring systems, there is an actively growing research and regulatory interest to evaluate the feasibility of using existing on-board NOx sensors for HD on-board NOx compliance. However, research studies have highlighted that NOx sensor measurements are also subjected to cross-sensitivity from other species in the exhaust stream. The journey towards completion of an exciting academic adventure has been a collaborative endeavor, where I would like to thank a huge group of people who have supported me with guidance, motivation, and opportunities as stepping stones to achieve professional growth. First and foremost, I would like to thank my parents Premnath and Ratnamala for providing me with their unconditional love, encouragement, endless support, and countless sacrifices in fulfilling every dream of mine since my childhood. This journey would not have been possible without the support of mom and dad, both emotionally and financially. Thank you for believing in me and always supporting me in my decisions, even through the most challenging times. vi temporarily moved to Detroit for my internship. You have always helped me get through challenging and difficult phases in life, and most importantly supported me with the important decisions of my life. Thank you very much. Special thanks to Ikttesh Chahal for your friendship since the time we met. Thanks for always offering me with your valuable advice whenever needed and believing in me that I had the potential to do more than I actually do and alwa...

show abstract

The GREET Model Expansion for Well-to-Wheels Analysis of Heavy-Duty Vehicles

Abstract: Fleet characteristics of the highest-fuel-consuming vehicle types by GVWR class and body type in each vehicle subcategory, based on 2002 VIUS data .

Cited by 14 publications

References 71 publications

The greenhouse gas benefits of corn ethanol – assessing recent evidence

The greenhouse gas benefits of corn ethanol – assessing recent evidence

Future methane emissions from the heavy-duty natural gas transportation sector for stasis, high, medium, and low scenarios in 2035

Development of an Activity-based Windowing Approach to Evaluate Real-World NOx Emissions from Modern Medium and Heavy-Duty Diesel Trucks

Contact Info

Product

Resources

About