This presentation was given December 14, 2010, as part of DOE's Webinar series. The presentation discusses geothermal heat pump retrofits, technology options, and an overview of geothermal energy and geothermal heat pumps.

This presentation discusses the challenges and opportunities of wind energy.

This presentation outlines utility concerns when evaluating PV technologies for risk.

This presentation discusses digital curation, preservation and stewardship. The author provides information on Curation Micro-Services.

This presentation summarizes Entering a New Stage of Learning from the U.S. Fuel Cell Electric Vehicle Demonstration Project.

A presentation discussing the Lead and Copper Rule (LCR) and how the EPA is in the process of developing revisions to the rule.

This presentation discusses about promoting healthy debate on environmental issues and creating appropriate reading lists on environmental science topic areas.

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.

This presentation uses a vehicle simulator and economics model called the Battery Ownership Model to examine the levelized cost per mile of conventional (CV) and hybrid electric vehicles (HEVs) in comparison with the cost to operate an electric vehicle (EV) under a service provider business model. The service provider is assumed to provide EV infrastructure such as charge points and swap stations to allow an EV with a 100-mile range to operate with driving profiles equivalent to CVs and HEVs. Battery cost, fuel price forecast, battery life, and other variables are examined to determine under what scenarios the levelized cost of an EV with a service provider can approach that of a CV. Scenarios in both the United States as an average and Hawaii are examined. The levelized cost of operating an EV with a service provider under average U.S. conditions is approximately twice the cost of operating a small CV. If battery cost and life can be improved, in this study the cost of an EV drops to under 1.5 times the cost of a CV for U.S. average conditions. In Hawaii, the same EV is only slightly more expensive to operate than a CV.

This presentation was written and presented by Elizabeth Doris (NREL) at the November 17 TAP Webinar to provide background detail about how state policies are transforming the clean energy market in different regions of the country.

Invited Tutorial presented as part of AMS International Short Course Series.

This presentation describes the multi-physics behaviors of internal and external short circuits in large lithium-ion batteries.

This presentation outlines a history of PV field experience.

Presentation about federal fleet data, working with the federal government, and results from a survey of Clean Cities coordinators about their experiences with regulated fleets.

Presentation on how the University of North Texas Libraries' Digital Projects Unit established their metadata guidelines and how the guidelines work to support The Portal to Texas History and the University of North Texas Digital Library.

This presentation reports the findings of NREL's screen test to characterize the durability of poly (methyl methacrylate) lenses used in concentrated photovoltaics.

This presentation summarizes U.S. Fuel Cell Electric Vehicle Demonstration Project 2010 Status Update.

This presentation summarizes ARRA fuel cell deployment and operation.

Presentation for the 2010 Depository Library Council Annual Meeting. This presentation discusses the 7.5 minute quadrangle project by the University of North Texas (UNT) Libraries' Digital Projects Unit and gives the background, goals, processes, challenges, and next steps.

This presentation summarizes "A Technoeconomic Analysis of Biomethane Production from Biogas and Pipeline Delivery".

In many commercial cells, long tabs at both cell sides, leading to uniform potentials along the spiral direction of wound jelly rolls, are rarely seen because of their high manufacturing cost. More often, several metal strips are welded at discrete locations along both current collector foils. With this design, the difference of electrical potentials is easily built up along current collectors in the spiral direction. Hence, the design features of the tabs, such as number, location and size, can be crucial factors for spiral-shaped battery cells. This paper presents a Li-ion battery cell model having a 3-dimensional spiral mesh involving a wound jellyroll structure. Further results and analysis will be given regarding impacts of tab location, number, and size.

This presentation addresses the current state of wind energy technology in the United States.

This presentation discusses collaborative digital repository opportunities. The presentation offers questions and considerations as well as managing digital collections.

The presentation introduces the various types of CPV technologies and provides a status report of today's CPV companies. Six different architectures of multijunction cells are shown to near or surpass 40% in efficiency. The design space for CPV is quite complex, which is a curse for those trying to narrow it down for the first prototype, but a blessing for those who want multiple pathways for product improvement in coming years.