Sample records for drayage
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DOT National Transportation Integrated Search
2016-05-01
The purpose of this project is to design and experiment on a technology to track, organize, : extract and analyze data on port drayage activities from which a clear understanding of drayage : efficiency can be gained. Drayage efficiency may point to ...
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DOT National Transportation Integrated Search
2016-05-01
Inefficient use of drayage trucks results in negative externalities in the form of pollution and congestion. A clear : awareness of the current state of drayage efficiency is especially important in Southern California since the cargo : volume at the...
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Drayage Truckers Best Practices
Drayage truckers best practices include: replacing older trucks with newer cleaner trucks, avoiding idling, maintaining engines, retrofitting trucks with verified technologies, and operating during off-peak hours.
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Heavy-Duty Vehicle Port Drayage Drive Cycle Characterization and Development
DOE Office of Scientific and Technical Information (OSTI.GOV)
Prohaska, Robert; Konan, Arnaud; Kelly, Kenneth
In an effort to better understand the operational requirements of port drayage vehicles and their potential for adoption of advanced technologies, National Renewable Energy Laboratory (NREL) researchers collected over 36,000 miles of in-use duty cycle data from 30 Class 8 drayage trucks operating at the Port of Long Beach and Port of Los Angeles in Southern California. These data include 1-Hz global positioning system location and SAE J1939 high-speed controller area network information. Researchers processed the data through NREL's Drive-Cycle Rapid Investigation, Visualization, and Evaluation tool to examine vehicle kinematic and dynamic patterns across the spectrum of operations. Using themore » k-medoids clustering method, a repeatable and quantitative process for multi-mode drive cycle segmentation, the analysis led to the creation of multiple drive cycles representing four distinct modes of operation that can be used independently or in combination. These drive cycles are statistically representative of real-world operation of port drayage vehicles. When combined with modeling and simulation tools, these representative test cycles allow advanced vehicle or systems developers to efficiently and accurately evaluate vehicle technology performance requirements to reduce cost and development time while ultimately leading to the commercialization of advanced technologies that meet the performance requirements of the port drayage vocation. The drive cycles, which are suitable for chassis dynamometer testing, were compared to several existing test cycles. This paper presents the clustering methodology, accompanying results of the port drayage duty cycle analysis and custom drive cycle creation.« less
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Heavy-Duty Vehicle Port Drayage Drive Cycle Characterization and Development: Preprint
DOE Office of Scientific and Technical Information (OSTI.GOV)
Prohaska, Robert; Konan, Arnaud; Kelly, Kenneth
In an effort to better understand the operational requirements of port drayage vehicles and their potential for adoption of advanced technologies, National Renewable Energy Laboratory (NREL) researchers collected over 36,000 miles of in-use duty cycle data from 30 Class 8 drayage trucks operating at the Port of Long Beach and Port of Los Angeles in Southern California. These data include 1-Hz global positioning system location and SAE J1939 high-speed controller area network information. Researchers processed the data through NREL's Drive-Cycle Rapid Investigation, Visualization, and Evaluation tool to examine vehicle kinematic and dynamic patterns across the spectrum of operations. Using themore » k-medoids clustering method, a repeatable and quantitative process for multi-mode drive cycle segmentation, the analysis led to the creation of multiple drive cycles representing four distinct modes of operation that can be used independently or in combination. These drive cycles are statistically representative of real-world operation of port drayage vehicles. When combined with modeling and simulation tools, these representative test cycles allow advanced vehicle or systems developers to efficiently and accurately evaluate vehicle technology performance requirements to reduce cost and development time while ultimately leading to the commercialization of advanced technologies that meet the performance requirements of the port drayage vocation. The drive cycles, which are suitable for chassis dynamometer testing, were compared to several existing test cycles. This paper presents the clustering methodology, accompanying results of the port drayage duty cycle analysis and custom drive cycle creation.« less
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Heavy-Duty Vehicle Port Drayage Drive Cycle Characterization and Development
DOE Office of Scientific and Technical Information (OSTI.GOV)
Prohaska, Robert; Konan, Arnaud; Kelly, Kenneth
2016-05-02
In an effort to better understand the operational requirements of port drayage vehicles and their potential for adoption of advanced technologies, National Renewable Energy Laboratory (NREL) researchers collected over 36,000 miles of in-use duty cycle data from 30 Class 8 drayage trucks operating at the Port of Long Beach and Port of Los Angeles in Southern California. These data include 1-Hz global positioning system location and SAE J1939 high-speed controller area network information. Researchers processed the data through NREL's Drive-Cycle Rapid Investigation, Visualization, and Evaluation tool to examine vehicle kinematic and dynamic patterns across the spectrum of operations. Using themore » k-medoids clustering method, a repeatable and quantitative process for multi-mode drive cycle segmentation, the analysis led to the creation of multiple drive cycles representing four distinct modes of operation that can be used independently or in combination. These drive cycles are statistically representative of real-world operation of port drayage vehicles. When combined with modeling and simulation tools, these representative test cycles allow advanced vehicle or systems developers to efficiently and accurately evaluate vehicle technology performance requirements to reduce cost and development time while ultimately leading to the commercialization of advanced technologies that meet the performance requirements of the port drayage vocation. The drive cycles, which are suitable for chassis dynamometer testing, were compared to several existing test cycles. This paper presents the clustering methodology, accompanying results of the port drayage duty cycle analysis and custom drive cycle creation.« less
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Characteristics of drayage operations at the Port of Houston.
DOT National Transportation Integrated Search
2008-09-01
Port drayage, defined as a container truck pickup to or from a seaport terminal with both the trip : origin and destination in the same urban area, is a critical yet comparatively understudied link in the : intermodal supply chain. Because port dray ...
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DOT National Transportation Integrated Search
2014-09-01
This paper describes the population characteristics in the drayage trucking population of the Port of Seattle as determined by the 2013 Truck : Driver Survey. The 2013 Truck Driver Survey was created to give the Port of Seattle more information on th...
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DOT National Transportation Integrated Search
2008-02-01
Using data from detailed surveys of truck drivers, the wages and working conditions of drivers involved in port drayage were : analyzed. Focus as on drivers' willingness to pay for retrofitting and their preferences regarding different truck replacem...
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Plug-In Hybrid Urban Delivery Truck Technology Demonstration
DOE Office of Scientific and Technical Information (OSTI.GOV)
Miyasato, Matt; Impllitti, Joseph; Pascal, Amar
The I-710 and CA-60 highways are key transportation corridors in the Southern California region that are heavily used on a daily basis by heavy duty drayage trucks that transport the cargo from the ports to the inland transportation terminals. These terminals, which include store/warehouses, inland-railways, are anywhere from 5 to 50 miles in distance from the ports. The concentrated operation of these drayage vehicles in these corridors has had and will continue to have a significant impact on the air quality in this region whereby significantly impacting the quality of life in the communities surrounding these corridors. To reduce thesemore » negative impacts it is critical that zero and near-zero emission technologies be developed and deployed in the region. A potential local market size of up to 46,000 trucks exists in the South Coast Air Basin, based on near- dock drayage trucks and trucks operating on the I-710 freeway. The South Coast Air Quality Management District (SCAQMD), California Air Resources Board (CARB) and Southern California Association of Governments (SCAG) — the agencies responsible for preparing the State Implementation Plan required under the federal Clean Air Act — have stated that to attain federal air quality standards the region will need to transition to broad use of zero and near zero emission energy sources in cars, trucks and other equipment (Southern California Association of Governments et al, 2011). SCAQMD partnered with Volvo Trucks to develop, build and demonstrate a prototype Class 8 heavy-duty plug-in hybrid drayage truck with significantly reduced emissions and fuel use. Volvo’s approach leveraged the group’s global knowledge and experience in designing and deploying electromobility products. The proprietary hybrid driveline selected for this proof of concept was integrated with multiple enhancements to the complete vehicle in order to maximize the emission and energy impact of electrification. A detailed review of all technologies included in the demonstrator is presented in this report. The project was completed in July 2015 with a final demonstration of the concept vehicle on a simulated drayage route around Volvo’s North American headquarters in Greensboro, NC. The route included all traffic conditions typical of drayage operation in Southern California as well as geofences defined to showcase the zero emission capabilities of the truck. The demonstrator successfully completed four consecutive trips with a gross combined vehicle weight of 44,000 lb., covering approximately 2 miles out of a total distance of 9 miles per trip in the Zero Emission (ZE) geofence. This vehicle is expected to use approximately 30% less fuel than a typical drayage truck in daily operation, and it is designed to allow full electric operation whenever operating in a marine terminal in the ports of Los Angeles / Long Beach. A paper study on the feasibility of expanding the capabilities of the plug-in hybrid concept developed as part of this project was also delivered as an addendum to the regular progress reports.« less
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A set-covering formulation for a drayage problem with single and double container loads
NASA Astrophysics Data System (ADS)
Ghezelsoflu, A.; Di Francesco, M.; Frangioni, A.; Zuddas, P.
2018-01-01
This paper addresses a drayage problem, which is motivated by the case study of a real carrier. Its trucks carry one or two containers from a port to importers and from exporters to the port. Since up to four customers can be served in each route, we propose a set-covering formulation for this problem where all possible routes are enumerated. This model can be efficiently solved to optimality by a commercial solver, significantly outperforming a previously proposed node-arc formulation. Moreover, the model can be effectively used to evaluate a new distribution policy, which results in an enlarged set of feasible routes and can increase savings w.r.t. the policy currently employed by the carrier.
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National Grants: 2012-2017 RFPs & Documents
Request for Proposals, project narrative sample, application fleet description sample, priority county list, sample drayage, model years for eligible nonroad engines, marine engine eligibility, frequently asked questions, and webinar slides
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National Grants: 2012-2018 RFPs & Documents
Request for Proposals, project narrative sample, application fleet description sample, priority county list, sample drayage, model years for eligible nonroad engines, marine engine eligibility, frequently asked questions, and webinar slides
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2013 RFP Ports Initiative Supporting Documents
Documents include: RFPs, Project Narrative, Application fleet description (AFD), Priority County List, Model years for eligible nonroad engines (nonroad remaining useful life), Sample Drayage, Marince Engine Eligibility, FAQs, and Webinar slides
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2014 RFP Ports Initiative Supporting Documents
Documents include: RFPs, Project Narrative, Application fleet description (AFD), Priority County List, Model years for eligible nonroad engines (nonroad remaining useful life), Sample Drayage, Marince Engine Eligibility, FAQs, and Webinar slides
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Best Practices for Port Operations
This page provides links to best practice resources for port authorities, terminal operators and fleet owners, drayage truckers, and rail and locomotives as well as a link to case studies on best practice.
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Alternative Fuels Data Center: Arizona Transportation Data for Alternative
Additions and Updates Plug-In Electric Vehicle (PEV) Charging Rate Incentive - Tucson Electric Power (TEP School Bus/Vehicle Incentive, and Green Jobs Outreach Program Heavy-Duty Natural Gas Drayage Truck
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Evaluation of the effect of gate strategies in drayage related emissions.
DOT National Transportation Integrated Search
2013-03-01
Intermodal Marine Container Terminals are experiencing growth in container volumes and are under pressure to : develop strategies to accommodate increasing demand. One of the major factors contributing to the problem is : inefficient gate operations ...
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Dallmann, Timothy R; Harley, Robert A; Kirchstetter, Thomas W
2011-12-15
Heavy-duty diesel drayage trucks have a disproportionate impact on the air quality of communities surrounding major freight-handling facilities. In an attempt to mitigate this impact, the state of California has mandated new emission control requirements for drayage trucks accessing ports and rail yards in the state beginning in 2010. This control rule prompted an accelerated diesel particle filter (DPF) retrofit and truck replacement program at the Port of Oakland. The impact of this program was evaluated by measuring emission factor distributions for diesel trucks operating at the Port of Oakland prior to and following the implementation of the emission control rule. Emission factors for black carbon (BC) and oxides of nitrogen (NO(x)) were quantified in terms of grams of pollutant emitted per kilogram of fuel burned using a carbon balance method. Concentrations of these species along with carbon dioxide were measured in the exhaust plumes of individual diesel trucks as they drove by en route to the Port. A comparison of emissions measured before and after the implementation of the truck retrofit/replacement rule shows a 54 ± 11% reduction in the fleet-average BC emission factor, accompanied by a shift to a more highly skewed emission factor distribution. Although only particulate matter mass reductions were required in the first year of the program, a significant reduction in the fleet-average NO(x) emission factor (41 ± 5%) was observed, most likely due to the replacement of older trucks with new ones.
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Freight Advanced Traveler Information System (FRATIS) impact assessment.
DOT National Transportation Integrated Search
2016-01-01
This report is an independent assessment of three prototype Freight Advanced Traveler Information System (FRATIS) tests at Los Angeles, Dallas/Fort Worth, and South Florida. The FRATIS technologies deployed at one or two drayage companies in each tes...
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GCT Bayonne’s Drayage Truck Appointment System
Global Container Terminals (GCT) has implemented an advanced truck appointment system at its GCT Bayonne facility at the Port of New York and New Jersey that has realized benefits in terms of cost savings, turn times, the environment, and congestion.
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DOT National Transportation Integrated Search
2014-10-30
This report documents policy considerations for the Freight Advanced Traveler Information System, or FRATIS. FRATIS applications provide freight-specific route guidance and optimize drayage operations so that load movements are coordinated between fr...
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48 CFR 52.246-14 - Inspection of Transportation.
Code of Federal Regulations, 2010 CFR
2010-10-01
... Transportation. 52.246-14 Section 52.246-14 Federal Acquisition Regulations System FEDERAL ACQUISITION REGULATION....246-14 Inspection of Transportation. As prescribed in 46.314, insert the following clause in solicitations and contracts for freight transportation services (including local drayage) by rail, motor...
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48 CFR 52.246-14 - Inspection of Transportation.
Code of Federal Regulations, 2013 CFR
2013-10-01
... Transportation. 52.246-14 Section 52.246-14 Federal Acquisition Regulations System FEDERAL ACQUISITION REGULATION....246-14 Inspection of Transportation. As prescribed in 46.314, insert the following clause in solicitations and contracts for freight transportation services (including local drayage) by rail, motor...
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48 CFR 52.246-14 - Inspection of Transportation.
Code of Federal Regulations, 2011 CFR
2011-10-01
... Transportation. 52.246-14 Section 52.246-14 Federal Acquisition Regulations System FEDERAL ACQUISITION REGULATION....246-14 Inspection of Transportation. As prescribed in 46.314, insert the following clause in solicitations and contracts for freight transportation services (including local drayage) by rail, motor...
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48 CFR 52.246-14 - Inspection of Transportation.
Code of Federal Regulations, 2012 CFR
2012-10-01
... Transportation. 52.246-14 Section 52.246-14 Federal Acquisition Regulations System FEDERAL ACQUISITION REGULATION....246-14 Inspection of Transportation. As prescribed in 46.314, insert the following clause in solicitations and contracts for freight transportation services (including local drayage) by rail, motor...
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48 CFR 252.247-7008 - Evaluation of bids.
Code of Federal Regulations, 2014 CFR
2014-10-01
....247-7008 Section 252.247-7008 Federal Acquisition Regulations System DEFENSE ACQUISITION REGULATIONS SYSTEM, DEPARTMENT OF DEFENSE CLAUSES AND FORMS SOLICITATION PROVISIONS AND CONTRACT CLAUSES Text of... the administrative costs in paragraph (b)(1). (c) When drayage is necessary for the accomplishment of...
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48 CFR 252.247-7010 - Scope of contract.
Code of Federal Regulations, 2010 CFR
2010-10-01
... containers (Federal Specification PPP-B-580), all equipment, plant and labor; and (2) Perform all work in accomplishing containerization of personal property for overseas or domestic movement or storage, including— (i... property (including servicing of appliances) for movement or storage, drayage and related services. Unless...
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MOVES2014: Heavy-duty Vehicle Emissions Report
This report updates MOVES methods for evaluating current HD diesel NOx emission rates based on comparisons to independent data from EPA’s IUVP and Houston drayage programs. The report also details methods/assumptions made for HD gasoline HC, CO and NOx emission rates using reduct...
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Code of Federal Regulations, 2014 CFR
2014-04-01
... categorized by the World Bank as upper middle income countries according to their gross national income per... advanced developing countries primarily based on the most recent World Bank determinations, and will make...: export packing, local drayage in the source country (including waiting time at the dock), ocean and other...
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Code of Federal Regulations, 2012 CFR
2012-04-01
... categorized by the World Bank as upper middle income countries according to their gross national income per... advanced developing countries primarily based on the most recent World Bank determinations, and will make...: export packing, local drayage in the source country (including waiting time at the dock), ocean and other...
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South Coast Air Quality Management District Truck Testing | Transportation
movement of cargo containers, also known as drayage, creates substantial air pollution in the vicinity of and U.S. Hybrid Corporation, transport cargo containers between the port complex and local rail yards and distribution centers. Utilizing advanced batteries and high-efficiency components, the electric
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Alternative Fuels Data Center: Largest U.S. Port Complex Embraces LNG for
, and economic benefits. As of December 31, 2011, the deployed vehicles funded by the DOE ARRA award a minimum of 68 jobs. SCAQMD plans to provide a final estimate of the job benefits in the first additional benefits from its participation in the SCAQMD drayage truck program: "I think there are
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Thiruvengadam, Arvind; Besch, Marc C; Thiruvengadam, Pragalath; Pradhan, Saroj; Carder, Daniel; Kappanna, Hemanth; Gautam, Mridul; Oshinuga, Adewale; Hogo, Henry; Miyasato, Matt
2015-04-21
Chassis dynamometer emissions testing of 11 heavy-duty goods movement vehicles, including diesel, natural gas, and dual-fuel technology, compliant with US-EPA 2010 emissions standard were conducted. Results of the study show that three-way catalyst (TWC) equipped stoichiometric natural gas vehicles emit 96% lower NOx emissions as compared to selective catalytic reduction (SCR) equipped diesel vehicles. Characteristics of drayage truck vocation, represented by the near-dock and local drayage driving cycles, were linked to high NOx emissions from diesel vehicles equipped with a SCR. Exhaust gas temperatures below 250 °C, for more than 95% duration of the local and near-dock driving cycles, resulted in minimal SCR activity. The low percentage of activity SCR over the local and near-dock cycles contributed to a brake-specific NOx emissions that were 5-7 times higher than in-use certification limit. The study also illustrated the differences between emissions rate measured from chassis dynamometer testing and prediction from the EMFAC model. The results of the study emphasize the need for model inputs relative to SCR performance as a function of driving cycle and engine operation characteristics.
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Athena Research Ship System (Users Guide)
1988-05-01
Users may arrange for their own account any logistic support that does not impact the ship directly; such as crane service, drayage, small craft, flying...craft, photographic services, and the like. Any services that impact the ships’ structural, propulsion and electrical or electronic systems must be...by block number) This manual was developed to provide general information regarding the ATHENA RESEARCH SHIP SYSTEM and specific data relative to the
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Federal Register 2010, 2011, 2012, 2013, 2014
2012-04-04
...EPA is taking final action to approve a revision to the California State Implementation Plan (SIP) submitted by the California Air Resources Board (CARB or Board). This revision concerns two regulations that reduce emissions of diesel particulate matter (PM), oxides of nitrogen (NOX), and other pollutants from in-use, heavy-duty diesel-fueled trucks and buses, and drayage trucks. EPA is approving this SIP revision because the Agency has determined that the regulations are consistent with the relevant Clean Air Act requirements, policies and guidance. Final approval of the two regulations and incorporation of them into the California SIP makes them federally enforceable.
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Medium- and Heavy-Duty Vehicle Duty Cycles for Electric Powertrains
DOE Office of Scientific and Technical Information (OSTI.GOV)
Kelly, Kenneth; Bennion, Kevin; Miller, Eric
2016-03-02
NREL's Fleet Test and Evaluation group has extensive in-use vehicle data demonstrating the importance of understanding the vocational duty cycle for appropriate sizing of electric vehicle (EV) and power electronics components for medium- and heavy-duty EV applications. This presentation includes an overview of recent EV fleet evaluation projects that have valuable in-use data that can be leveraged for sub-system research, analysis, and validation. Peak power and power distribution data from in-field EVs are presented for four different vocations, including class 3 delivery vans, class 6 delivery trucks, class 8 transit buses, and class 8 port drayage trucks, demonstrating the impactsmore » of duty cycle on performance requirements.« less
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Analysis of hydrogen as a Transportation Fuel FY17 Report
DOE Office of Scientific and Technical Information (OSTI.GOV)
Pratt, Richard M.; Luzi, Francesco; Wilcox Freeburg, Eric D.
This report summarizes the results of literature reviews, surveys and analyses performed to evaluate the potential of hydrogen-fueled vehicles to be an economically viable transportation alternative. Five existing and important drivers of expanding hydrogen-fueled transportation adoption are multi-billion dollar sales reservations of Nikola Class 8 trucks, CALSTART viability analysis of hybrid-hydrogen drayage trucks in the shipyard cargo application, analysis showing economic advantages of Fuel Cell Electric Vehicles (FCEV)s over Battery Electric Vehicles (BEV)s beginning at 150-mile ranges, the announcement of a commercial 5kg electrolyzer, and commercial plans or vehicle availability by nine vehicle manufacturers of FCEV passenger vehicles. But hydrogenmore » infrastructure availability needed to support broad adoption of hydrogen-fueled vehicles is limited to less than 50 publicly-available refueling stations, primarily in California. The demand side (consumer) economics associated with FCEV adoption showed strong economic sensitivity to the original vehicle’s fuel economy (mpg), distance traveled, and hydrogen (H2) generation costs. Seven use cases were used to evaluate the broad range of potential FCEV purchasers, including autonomous vehicle applications. Each consumer use case analysis resulted in a different hydrogen fuel cost that would be equivalent to the current fuel cost being paid by the consumer. The H2 generation costs (supply side) were sensitive to the volume of H2 supplied and H2 production costs needed to repay H2 supply facility capital costs and produce competitively-priced energy. H2FAST was used to more accurately incorporate capital, maintenance and production costs into a viable H2 supply cost to the consumer. When the H2 generation and consumer economics were combined, several applications with positive economics became clear. The availability of low-cost hydrogen pipeline connections, and therefore low-cost hydrogen, greatly benefits the California drayage truck application with hybrid-hydrogen retrofits being repaid within seven years. Class 8 trucks could also take advantage of these low-cost, but regional hydrogen supplies. In addition, the IVYS electrolyzer-based hydrogen generation product showed the potential to deliver hydrogen economically in an urban or freeway off-ramp setting to a limited number of passenger vehicles in areas with low-cost electricity. These positive, manually developed results show the need to develop more advanced tools to provide an expanded evaluation of the economics of hydrogen-based fuel applications. The use cases evaluated showed significant potential for hydrogen-fueled vehicles to have a sustainable impact as a transportation fuel. The positive impact is not limited to transportation fuels, but also grid resilience and flexibility through the use of controllable and variable electrolyzer output to rapidly adjust to changing grid conditions and enable greater integration of solar and wind generated power. This capability would directly enable alternative fuel vehicles to impact energy consumption, GHG emissions, and the economy at the regional and national levels.« less
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Haugen, Molly J; Bishop, Gary A
2018-05-15
Two California heavy-duty fleets have been measured in 2013, 2015, and 2017 using the On-Road Heavy-Duty Measurement System. The Port of Los Angeles drayage fleet has increased in age by 3.3 model years (4.2-7.5 years old) since 2013, with little fleet turnover. Large increases in fuel-specific particle emissions (PM) observed in 2015 were reversed in 2017, returning to near 2013 levels, suggesting repairs and or removal of high emitting vehicles. Fuel-specific oxides of nitrogen (NO x ) emissions of this fleet have increased, and NO x after-treatment systems do not appear to perform ideally in this setting. At the Cottonwood weigh station in northern California, the fleet age has declined (7.8 to 6 years old) since 2013 due to fleet turnover, significantly lowering the average fuel-specific emissions for PM (-87%), black carbon (-76%), and particle number (-64%). Installations of retrofit-diesel particulate filters in model year 2007 and older vehicles have further decreased particle emissions. Cottonwood fleet fuel-specific NO x emissions have decreased slightly (-8%) during this period; however, newer technology vehicles with selective catalytic reduction systems (SCR) promise an additional factor of 4-5 further reductions in the long-haul fleet emissions as California transitions to an all SCR-equipped fleet.
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Wang, Tianyang; Quiros, David C; Thiruvengadam, Arvind; Pradhan, Saroj; Hu, Shaohua; Huai, Tao; Lee, Eon S; Zhu, Yifang
2017-06-20
Particle emissions from heavy-duty vehicles (HDVs) have significant environmental and public health impacts. This study measured total particle number emission factors (PNEFs) from six newly certified HDVs powered by diesel and compressed natural gas totaling over 6800 miles of on-road operation in California. Distance-, fuel- and work-based PNEFs were calculated for each vehicle. Distance-based PNEFs of vehicles equipped with original equipment manufacturer (OEM) diesel particulate filters (DPFs) in this study have decreased by 355-3200 times compared to a previous retrofit DPF dynamometer study. Fuel-based PNEFs were consistent with previous studies measuring plume exhaust in the ambient air. Meanwhile, on-road PNEF shows route and technology dependence. For vehicles with OEM DPFs and Selective Catalytic Reduction Systems, PNEFs under highway driving (i.e., 3.34 × 10 12 to 2.29 × 10 13 particles/mile) were larger than those measured on urban and drayage routes (i.e., 5.06 × 10 11 to 1.31 × 10 13 particles/mile). This is likely because a significant amount of nucleation mode volatile particles were formed when the DPF outlet temperature reached a critical value, usually over 310 °C, which was commonly achieved when vehicle speed sustained over 45 mph. A model year 2013 diesel HDV produced approximately 10 times higher PNEFs during DPF active regeneration events than nonactive regeneration.
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Boriboonsomsin, Kanok; Durbin, Thomas; Scora, George; Johnson, Kent; Sandez, Daniel; Vu, Alexander; Jiang, Yu; Burnette, Andrew; Yoon, Seungju; Collins, John; Dai, Zhen; Fulper, Carl; Kishan, Sandeep; Sabisch, Michael; Jackson, Doug
2018-09-01
On-road heavy-duty diesel vehicles are a major contributor of oxides of nitrogen (NO x ) emissions. In the US, many heavy-duty diesel vehicles employ selective catalytic reduction (SCR) technology to meet the 2010 emission standard for NO x . Typically, SCR needs to be at least 200°C before a significant level of NO x reduction is achieved. However, this SCR temperature requirement may not be met under some real-world operating conditions, such as during cold starts, long idling, or low speed/low engine load driving activities. The frequency of vehicle operation with low SCR temperature varies partly by the vehicle's vocational use. In this study, detailed vehicle and engine activity data were collected from 90 heavy-duty vehicles involved in a range of vocations, including line haul, drayage, construction, agricultural, food distribution, beverage distribution, refuse, public work, and utility repair. The data were used to create real-world SCR temperature and engine load profiles and identify the fraction of vehicle operating time that SCR may not be as effective for NO x control. It is found that the vehicles participated in this study operate with SCR temperature lower than 200°C for 11-70% of the time depending on their vocation type. This implies that real-world NO x control efficiency could deviate from the control efficiency observed during engine certification. Copyright © 2018 Elsevier B.V. All rights reserved.