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588 Matching Results
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2004 DOE Hydrogen, Fuel Cells & Infrastructure Technologies Program Review Presentation COST AND PERFORMANCE ENHANCEMENTS FOR A PEM FUEL CELL TURBOCOMPRESSOR
The objective is to assist the Department of Energy in the development of a low cost, reliable and high performance air compressor/expander. Technical Objective 1: Perform a turbocompressor systems PEM fuel cell trade study to determine the enhanced turbocompressor approach. Technical Objective 2: Using the results from technical objective 1, an enhanced turbocompressor will be fabricated. The design may be modified to match the flow requirements of a selected fuel cell system developer. Technical Objective 3: Design a cost and performance enhanced compact motor and motor controller. Technical Objective 4: Turbocompressor/motor controller development.
Date:
April 1, 2004
Creator:
Gee, Mark K.
System:
The UNT Digital Library
2005 DOE Hydrogen Program Review: Hydrogen Codes and Standards
A PowerPoint presentation given as part of the 2005 Hydrogen Program Review, May 24, 2005, in Washington, D.C.
Date:
May 1, 2005
Creator:
Ohi, J.
System:
The UNT Digital Library
2008 Solar Annual Review Meeting, Session: Parabolic Troughs
The project description is R and D activities at NREL and Sandia aimed at lowering the delivered energy cost of parabolic trough collector systems and FOA awards to support industry in trought development. The primary objectives are: (1) support development of near-term parabolic trought technology for central station power generation; (2) support development of next-generation trought fields; and (3) support expansion of US trough industry. The major FY08 activities were: (1) improving reflector optics; (2) reducing receiver heat loss (including improved receiver coating and mitigating hydrogen accumulation); (3) measuring collector optical efficiency; (4) optimizing plant performance and reducing cost; (5) reducing plant water consumption; and (6) directly supporting industry needs, including FOA support.
Date:
April 1, 2008
Creator:
Kutscher, Chuck
System:
The UNT Digital Library
4th Annual Meeting for Reporting and Exploring
Introductory presentation for the CoRSAL 4th Annual Meeting held on October 1, 2020.
Date:
October 1, 2020
Creator:
Chelliah, Shobhana Lakshmi
System:
The UNT Digital Library
Accelerated Stress Testing, Qualification Testing, HAST, Field Experience - What Do They All Mean?
This presentation discusses the need for a set of tests for modules that would predict their long term-field performance.
Date:
May 1, 2013
Creator:
Wohlgemuth, J.
System:
The UNT Digital Library
Accelerated Testing and On-Sun Failure of CPV Die-Attach
Accelerated Testing and On-Sun Failure of CPV Die-attach. Presentation on CPV accelerated reliability testing.
Date:
October 1, 2010
Creator:
Bosco, N.; Kurtz, S. & Stokes, A.
System:
The UNT Digital Library
Accelerated UV Test Methods for Encapsulants of Photovoltaic Modules
None
Date:
May 1, 2008
Creator:
Kempe, M. D.
System:
The UNT Digital Library
Accelerating Computation of the Unit Commitment Problem
Production cost models (PCMs) simulate power system operation at hourly (or higher) resolution. While computation times often extend into multiple days, the sequential nature of PCM's makes parallelism difficult. We exploit the persistence of unit commitment decisions to select partition boundaries for simulation horizon decomposition and parallel computation. Partitioned simulations are benchmarked against sequential solutions for optimality and computation time.
Date:
October 1, 2013
Creator:
Hummon, M.; Barrows, C. & Jones, W.
System:
The UNT Digital Library
Accelerating Design of Batteries Using Computer-Aided Engineering Tools
Computer-aided engineering (CAE) is a proven pathway, especially in the automotive industry, to improve performance by resolving the relevant physics in complex systems, shortening the product development design cycle, thus reducing cost, and providing an efficient way to evaluate parameters for robust designs. Academic models include the relevant physics details, but neglect engineering complexities. Industry models include the relevant macroscopic geometry and system conditions, but simplify the fundamental physics too much. Most of the CAE battery tools for in-house use are custom model codes and require expert users. There is a need to make these battery modeling and design tools more accessible to end users such as battery developers, pack integrators, and vehicle makers. Developing integrated and physics-based CAE battery tools can reduce the design, build, test, break, re-design, re-build, and re-test cycle and help lower costs. NREL has been involved in developing various models to predict the thermal and electrochemical performance of large-format cells and has used in commercial three-dimensional finite-element analysis and computational fluid dynamics to study battery pack thermal issues. These NREL cell and pack design tools can be integrated to help support the automotive industry and to accelerate battery design.
Date:
November 1, 2010
Creator:
Pesaran, A.; Kim, G. H. & Smith, K.
System:
The UNT Digital Library
Accelerating Development of EV Batteries Through Computer-Aided Engineering
The Department of Energy's Vehicle Technology Program has launched the Computer-Aided Engineering for Automotive Batteries (CAEBAT) project to work with national labs, industry and software venders to develop sophisticated software. As coordinator, NREL has teamed with a number of companies to help improve and accelerate battery design and production. This presentation provides an overview of CAEBAT, including its predictive computer simulation of Li-ion batteries known as the Multi-Scale Multi-Dimensional (MSMD) model framework. MSMD's modular, flexible architecture connects the physics of battery charge/discharge processes, thermal control, safety and reliability in a computationally efficient manner. This allows independent development of submodels at the cell and pack levels.
Date:
December 1, 2012
Creator:
Pesaran, A.; Kim, G. H.; Smith, K. & Santhanagopalan, S.
System:
The UNT Digital Library
Accelerating Fatigue Testing for Cu Ribbon Interconnects
This presentation describes fatigue experiments and discusses dynamic mechanical loading for Cu ribbon interconnects.
Date:
May 1, 2013
Creator:
Bosco, N.; Silverman, T.; Wohlgemuth , J.; Kurtz, S.; Inoue, M.; Sakurai, K. et al.
System:
The UNT Digital Library
Accounting for the Variation of Driver Aggression in the Simulation of Conventional and Advanced Vehicles
This presentation discusses a method of accounting for realistic levels of driver aggression to higher-level vehicle studies, including the impact of variation in real-world driving characteristics (acceleration and speed) on vehicle energy consumption and different powertrains (e.g., conventionally powered vehicles versus electrified drive vehicles [xEVs]). Aggression variation between drivers can increase fuel consumption by more than 50% or decrease it by more than 20% from average. The normalized fuel consumption deviation from average as a function of population percentile was found to be largely insensitive to powertrain. However, the traits of ideal driving behavior are a function of powertrain. In conventional vehicles, kinetic losses dominate rolling resistance and aerodynamic losses. In xEVs with regenerative braking, rolling resistance and aerodynamic losses dominate. The relation of fuel consumption predicted from real-world drive data to that predicted by the industry-standard HWFET, UDDS, LA92, and US06 drive cycles was not consistent across powertrains, and varied broadly from the mean, median, and mode of real-world driving. A drive cycle synthesized by NREL's DRIVE tool accurately and consistently reproduces average real-world for multiple powertrains within 1%, and can be used to calculate the fuel consumption effects of varying levels of driver aggression.
Date:
May 1, 2013
Creator:
Neubauer, J. & Wood, E.
System:
The UNT Digital Library
Active Power Control from Wind Power
In order to keep the electricity grid stable and the lights on, the power system relies on certain responses from its generating fleet. This presentation evaluates the potential for wind turbines and wind power plants to provide these services and assist the grid during critical times.
Date:
April 1, 2011
Creator:
Ela, E. & Brooks, D.
System:
The UNT Digital Library
Active Power Control Testing at the U.S. National Wind Technology Center (NWTC)
In order to keep the electricity grid stable and the lights on, the power system relies on certain responses from its generating fleet. This presentation evaluates the potential for wind turbines and wind power plants to provide these services and assist the grid during critical times.
Date:
January 1, 2011
Creator:
Ela, E.
System:
The UNT Digital Library
Adding Complex Terrain and Stable Atmospheric Condition Capability to the Simulator for On/Offshore Wind Farm Applications (SOWFA)
This presentation describes changes made to NREL's OpenFOAM-based wind plant aerodynamics solver so that it can compute the stably stratified atmospheric boundary layer and flow over terrain. Background about the flow solver, the Simulator for Off/Onshore Wind Farm Applications (SOWFA) is given, followed by details of the stable stratification/complex terrain modifications to SOWFA, along with some preliminary results calculations of a stable atmospheric boundary layer and flow over a simple set of hills.
Date:
June 1, 2013
Creator:
Churchfield, M. J.
System:
The UNT Digital Library
Addressing the Impact of Temperature Extremes on Large Format Li-Ion Batteries for Vehicle Applications
This presentation discusses the effects of temperature on large format lithium-ion batteries in electric drive vehicles.
Date:
May 1, 2013
Creator:
Pesaran, A.; Santhanagopalan, S. & Kim, G. H.
System:
The UNT Digital Library
Adhesion and Thin-Film Module Reliability
None
Date:
May 1, 2006
Creator:
McMahon, T. J. & Jorgensen, G. J.
System:
The UNT Digital Library
Advanced Fuel Cell Membranes Based on Heteropolyacids
A PowerPoint presentation given as part of the 2005 Hydrogen Program Review, May 24, 2005, in Washington, D.C.
Date:
May 1, 2005
Creator:
Turner, John A.; Pern, John; Herring, Andrew M.; Dec, Steven F.; Meng, Fanqin; Malers, Jennifer L. et al.
System:
The UNT Digital Library
Advanced Models and Controls for Prediction and Extension of Battery Lifetime
Predictive models of capacity and power fade must consider a multiplicity of degradation modes experienced by Li-ion batteries in the automotive environment. Lacking accurate models and tests, lifetime uncertainty must presently be absorbed by overdesign and excess warranty costs. To reduce these costs and extend life, degradation models are under development that predict lifetime more accurately and with less test data. The lifetime models provide engineering feedback for cell, pack and system designs and are being incorporated into real-time control strategies.
Date:
February 1, 2014
Creator:
Smith, K.; Wood, E.; Santhanagopalan, S.; Kim, G. & Pesaran, A.
System:
The UNT Digital Library
Advanced Thermal Control Enabling Cost Reduction for Automotive Power Electronics
Describes NREL's work on next-generation vehicle cooling technologies (jets, sprays, microchannels) and novel packaging topologies to reduce costs and increase performance and reliability.
Date:
September 1, 2008
Creator:
Abraham, T.; Kelly, K.; Bennion, K. & Vlahinos, A.
System:
The UNT Digital Library
Advanced Thermal Interface Materials (TIMs) for Power Electronics
This presentation describes our progress in the area of thermal interface materials for power electronics applications.
Date:
May 1, 2009
Creator:
Narumanchi, S.
System:
The UNT Digital Library
Air Cooling Technology for Advanced Power Electronics and Electric Machines
This presentation gives an overview of the status and FY09 accomplishments for the NREL thermal management research project 'Air Cooling for Power Electronics'.
Date:
May 1, 2009
Creator:
Bharathan, D.
System:
The UNT Digital Library
Los Alamos National Laboratory
Presentation for the 2012 International Internet Preservation Consortium General Assembly. This presentation describes Los Alamos National Laboratory's involvement in Project Memento for web archiving.
Date:
May 1, 2012
Creator:
Van de Sompel, Herbert
System:
The UNT Digital Library
Algal Biofuels Can Make a Difference (Presentation)
Presentation given at the 2012 Department of Homeland Security Renewable Energy Roundtable on Algal Fuels.
Date:
March 1, 2012
Creator:
Pienkos, P.
System:
The UNT Digital Library