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223 Matching Results
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Tools for Designing Thermal Management of Batteries in Electric Drive Vehicles
Temperature has a significant impact on life, performance, and safety of lithium-ion battery technology, which is expected to be the energy storage of choice for electric drive vehicles (xEVs). High temperatures degrade Li-ion cells faster while low temperatures reduce power and energy capabilities that could have cost, reliability, range, or drivability implications. Thermal management of battery packs in xEVs is essential to keep the cells in the desired temperature range and also reduce cell-to-cell temperature variations, both of which impact life and performance. The value that the battery thermal management system provides in reducing battery life and improving performance outweighs its additional cost and complexity. Tools that are essential for thermal management of batteries are infrared thermal imaging, isothermal calorimetry, thermal conductivity meter and computer-aided thermal analysis design software. This presentation provides details of these tools that NREL has used and we believe are needed to design right-sized battery thermal management systems.
Date:
February 1, 2013
Creator:
Pesaran, A.; Keyser, M.; Kim, G. H.; Santhanagopalan, S. & Smith, K.
System:
The UNT Digital Library
Using Solar Business Models to Expand the Distributed Wind Market
This presentation to attendees at Wind Powering America's All-States Summit in Chicago describes business models that were responsible for rapid growth in the solar industry and that may be applicable to the distributed wind industry as well.
Date:
May 1, 2013
Creator:
Savage, S.
System:
The UNT Digital Library
Building Toward a Small Wind Turbine Site Assessor Credential
Proper site assessment is integral to the development of a successful small wind project. Without a small wind site assessor certification program, consumers, including state incentive program managers, lack a benchmark for differentiating between qualified and nonqualified site assessors. A small wind site assessor best practice manual is being developed as a resource for consumers until a credential program becomes available. This presentation describes the purpose, proposed content, and the National Renewable Energy Laboratory's approach to the development of such a manual.
Date:
September 1, 2013
Creator:
Sinclair, K.
System:
The UNT Digital Library
Seminar 14 - Desiccant Enhanced Air Conditioning: Desiccant Enhanced Evaporative Air Conditioning
This presentation explains how liquid desiccant based coupled with an indirect evaporative cooler can efficiently produce cool, dry air, and how a liquid desiccant membrane air conditioner can efficiently provide cooling and dehumidification without the carryover problems of previous generations of liquid desiccant systems. It provides an overview to a liquid desiccant DX air conditioner that can efficiently provide cooling and dehumidification to high latent loads without the need for reheat, explains how liquid desiccant cooling and dehumidification systems can outperform vapor compression based air conditioning systems in hot and humid climates, explains how liquid desiccant cooling and dehumidification systems work, and describes a refrigerant free liquid desiccant based cooling system.
Date:
February 1, 2013
Creator:
Kozubal, E.
System:
The UNT Digital Library
Electric Vehicle Battery Thermal Issues and Thermal Management Techniques
This presentation examines the issues concerning thermal management in electric drive vehicles and management techniques for improving the life of a Li-ion battery in an EDV.
Date:
July 1, 2013
Creator:
Rugh, J. P.; Pesaran, A. & Smith, K.
System:
The UNT Digital Library
Microgrid V2G Charging Station Interconnection Testing
This presentation by Mike Simpson of the National Renewable Energy Laboratory (NREL) describes NREL's microgrid vehicle-to-grid charging station interconnection testing.
Date:
July 1, 2013
Creator:
Simpson, M.
System:
The UNT Digital Library
Offshore Wind Energy Market Overview
This presentation describes the current international market conditions regarding offshore wind, including the breakdown of installation costs, how to reduce costs, and the physical siting considerations considered when planning offshore wind construction. The presentation offers several examples of international existing and planned offshore wind farm sites and compares existing international offshore resources with U.S. resources. The presentation covers future offshore wind trends and cites some challenges that the United States must overcome before it will be able to fully develop offshore wind sites.
Date:
July 1, 2013
Creator:
Baring-Gould, I.
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
Understanding the Temperature and Humidity Environment Inside a PV Module [Presentation]
This presentation addresses moisture-driven degradation processes in PV modules and the conditions to use for accelerated stress testing. Here we show that by choosing humidity conditions that more closely match the use environment, one can minimize the uncertainty associated with moisture induced degradation modes.
Date:
June 1, 2013
Creator:
Kempe, M.
System:
The UNT Digital Library
Singularities of Generalized Parton Distributions
Progress of recent work on modeling generalized parton distributions is given. Special attention was paid to study of their singularities structure.
Date:
May 1, 2013
Creator:
Radyushkin, Anatoly V.
System:
The UNT Digital Library
Development of a Rating System for a Comparative Accelerated Test Standard
This presentation discusses methods of developing and structuring a useful rating system and communicating the results.
Date:
June 1, 2013
Creator:
Kurtz, S.
System:
The UNT Digital Library
National-Scale Wind Resource Assessment for Power Generation
This presentation describes the current standards for conducting a national-scale wind resource assessment for power generation, along with the risk/benefit considerations to be considered when beginning a wind resource assessment. The presentation describes changes in turbine technology and viable wind deployment due to more modern turbine technology and taller towers and shows how the Philippines national wind resource assessment evolved over time to reflect changes that arise from updated technologies and taller towers.
Date:
August 1, 2013
Creator:
Baring-Gould, E. I.
System:
The UNT Digital Library
Two-Phase Cooling of Power Electronics
Presentation details two-phase cooling of power electronics.
Date:
July 1, 2013
Creator:
Moreno, G.
System:
The UNT Digital Library
Examination of an Optical Transmittance Test for Photovoltaic Encapsulation Materials
The optical transmittance of encapsulation materials is a key characteristic for their use in photovoltaic (PV) modules. Changes in transmittance with time in the field affect module performance, which may impact product warranties. Transmittance is important in product development, module manufacturing, and field power production (both immediate and long-term). Therefore, an international standard (IEC 62788-1-4) has recently been proposed by the Encapsulation Task-Group within the Working Group 2 (WG2) of the International Electrotechnical Commission (IEC) Technical Committee 82 (TC82) for the quantification of the optical performance of PV encapsulation materials. Existing standards, such as ASTM E903, are general and more appropriately applied to concentrated solar power than to PV. Starting from the optical transmittance measurement, the solar-weighted transmittance of photon irradiance, yellowness index (which may be used in aging studies to assess durability), and ultraviolet (UV) cut-off wavelength may all be determined using the proposed standard. The details of the proposed test are described. The results of a round-robin experiment (for five materials) conducted at seven laboratories to validate the test procedure using representative materials are also presented. For example, the Encapsulation Group actively explored the measurement requirements (wavelength range and resolution), the requirements for the spectrophotometer (including the integrating …
Date:
September 1, 2013
Creator:
Miller, D.; Bengoechea, J.; Bokria, J.; Kohl, M.; Powell, N. E.; Smith, M. E. et al.
System:
The UNT Digital Library
A Study of Independent Patron Usage of Interactive Whiteboards at a Science Library
Presentation on a research study of independent patron usage of interactive whiteboards at a science library. Presentation presented at the Medical Library Association, South Central Chapter Annual Meeting.
Date:
October 28, 2013
Creator:
O'Toole, Erin & Elizondo, Yvette
System:
The UNT Digital Library
Bibliography as Applied Data Set: The Susanna Rowson Digital Compendium
Presentation for the 2013 Modern Language Association Convention Special Session. This presentation discusses bibliographies as applied data sets.
Date:
January 5, 2013
Creator:
Keralis, Spencer D. C.
System:
The UNT Digital Library
Keeping Human Resources Happy: The Use of Rubrics in Evaluations During Hiring and Performance Evaluations
Presentation for the inaugural Library Human Resources Management Association Conference. The authors discuss keeping human resources happy with the use of rubrics in evaluations during hiring and performance evaluations.
Date:
October 7, 2013
Creator:
Brannon, Sian & Leuzinger, Julie
System:
The UNT Digital Library
Encouraging Research and Publication among Academic Librarians
Presentation for the 2013 Library Management Institute Summer Conference. This presentation discusses encouraging research and publication among academic librarians. It covers topics on why support is needed, related surveys and methodology, respondents, and library research committees.
Date:
June 2013
Creator:
Sassen, Catherine
System:
The UNT Digital Library
Diffusion of Scientific Knowledge in Agriculture: The Case for Africa [Presentation]
Presentation for the International Association of Agriculture Information Specialists (IAALD) World Congress. The authors discuss the diffusion of scientific knowledge on agriculture for Africa.
Date:
July 2013
Creator:
Assefa, Shimelis; Alemneh, Daniel Gelaw & Rorissa, Abebe
System:
The UNT Digital Library
Moodle for Professional Development to Agricultural Extension Professionals in Africa: Workshop
Presentation for the International Association of Agriculture Information Specialists (IAALD) World Congress. The authors discuss the Modular Object-Oriented Dynamic Learning Environment (Moodle) software package and its use for professional development to agriculture extension professionals in Africa.
Date:
July 2013
Creator:
Assefa, Shimelis; Alemneh, Daniel Gelaw & Rorissa, Abebe
System:
The UNT Digital Library
Newspaper Preservation through Collaboration and Communication: The Texas Digital Newspaper Program
Presentation discussing the history and background, external support, communication, technology, and workflow of The Texas Digital Newspaper Program at the University of North Texas Libraries.
Date:
August 14, 2013
Creator:
Krahmer, Ana & Phillips, Mark Edward
System:
The UNT Digital Library
In With The New: Adapting To Change Using ILLiad
This presentation discusses adapting to change using ILLiad.
Date:
March 20, 2013
Creator:
Johnston, Pamela
System:
The UNT Digital Library
Improving Access to Web Archives through Innovative Analysis of PDF Content
This presentation discusses improving access to web archives through innovative analysis of PDF content. It includes a background of the End of Term (EOT) 2008 Presidential Web Archive, a collaborative web archiving project, collection development with web archive content, and the workflow and processes involved in these projects.
Date:
April 2013
Creator:
Phillips, Mark Edward
System:
The UNT Digital Library
Creating Order Out of Chaos: Introducing Name Authority into a Large ETD Collection
Presentation for the sixteenth international symposium on electronic theses and dissertations (ETDs). This presentation describes the challenges associated with controlling names, the approach of the University of North Texas (UNT) Libraries, the development and implementation of the UNT Name App, and discuss lessons learned.
Date:
September 25, 2013
Creator:
Waugh, Laura
System:
The UNT Digital Library