Promise of Solar: Variables to Consider When Evaluating the Use of Solar

This presentation on solar technologies and sustainability was given at the 17th Annual Rocky Mountain Land-Use Institute (RMLUI) Land-Use Conference.
Date: March 1, 2008
Creator: Carlisle, N.
System: The UNT Digital Library

Quantitative Analyses of the Severity of Attack on Crevice Corrosion Surfaces

None
Date: March 13, 2006
Creator: Hodges, A. J. & Kelly, R. G.
System: The UNT Digital Library

Renewable Energy Financing: The Role of Policy and Economics

Renewable portfolio standards (RPS) have rapidly developed momentum in certain sections of the United States and throughout the world, primarily in response to climate and energy security concerns. This presentation at the RPS Symposium, sponsored by the Electric Utility Consultants Inc., will discuss renewable energy financing and the economics of such policies.
Date: March 27, 2008
Creator: Cory, K.
System: The UNT Digital Library

Humidity, Temperature, and Voltage

An update is given on the work of the PV Quality Assurance Task Force; Group 3: studying the effects of humidity, temperature, and voltage bias.
Date: March 1, 2012
Creator: Wohlgemuth, J.
System: The UNT Digital Library

NREL Test-to-Failure Protocol [Presentation]

The presentation describes the test-to-failure protocol that was developed and piloted at NREL, stressing PV modules with multiple applications of damp heat (with bias) and thermal cycling until they fail.
Date: March 1, 2012
Creator: Hacke, P.
System: The UNT Digital Library

Renewable Energy 101 (Presentation)

Presentation given at the 2012 Department of Homeland Security Renewable Energy Roundtable as an introduction to renewable technologies and applications.
Date: March 1, 2012
Creator: Walker, A.
System: The UNT Digital Library

Durability of Polymeric Encapsulation Materials for Concentrating Photovoltaic Systems

Many concentrating photovoltaic (CPV) systems use a polymeric encapsulant to couple and optical component and/or coverglass to the cell. In that location, the encapsulation improves the transmission of concentrated optical flux through interface(s), while protecting the cell from the environment. The durability of encapsulation materials, however, is not well established relative to the desired service life of 30 years. Therefore, we have initiated a screen test to identify the field-induced failure modes for a variety of popular PV encapsulation materials. An existing CPV module (with no PV cells present) was modified to accommodate encapsulation specimens. The module (where nominal concentration of solar flux is 500x for the domed-Fresnel design) has been mounted on a tracker in Golden, CO (elevation 1.79 km). Initial results are reported here for 18 months cumulative exposure, including the hottest and coldest months of the past year. Characteristics observed at intervals during that time include: visual appearance, direct and hemispherical transmittance, and mass. Degradation may be assessed from subsequent analysis (including yellowness index and cut-on frequency) relative to the ambient conditions present during field exposure. The fluorescence signature observed of all the silicone specimens is examined here, including possible factors of causation -- the platinum catalyst …
Date: March 1, 2012
Creator: Miller, D. C.; Muller, M.; Kempe, M. D.; Araki, K.; Kennedy, C. E. & Kurtz, S. R.
System: The UNT Digital Library

Overview of Progress on the IEC Tracker Design Qualification Standard

An update is given on the IEC WG7's progress to write and publish a tracker design qualification standard.
Date: March 1, 2012
Creator: Muller, M.
System: The UNT Digital Library

Getting from Goals to Projects in the Ground (Presentation)

Presentation given at the 2012 Department of Homeland Security Renewable Energy Roundtable on Energy Savings Performance Contracts (ESPCs) and Power Purchase Agreements (PPAs) for Renewable Energy (RE).
Date: March 1, 2012
Creator: Springer, B.
System: The UNT Digital Library

Heat Pump Water Heater Modeling in EnergyPlus

This presentation summarizes NREL's development of a HPWH model for use in hourly building energy simulation programs, such as BEopt; this presentation was given at the Building America Stakeholder meeting on March 1, 2012, in Austin, Texas.
Date: March 1, 2012
Creator: Wilson, E. & Christensen, C.
System: The UNT Digital Library

Transportation Energy Futures: Project Overview and Findings

The U.S. Department of Energy-sponsored Transportation Energy Futures (TEF) project examines how combining multiple strategies could reduce both GHG emissions and petroleum use by 80%. The project's primary objective was to help inform domestic decisions about transportation energy strategies, priorities, and investments, with an emphasis on previously underexplored opportunities related to energy efficiency and renewable energy in light-duty vehicles, non-light-duty vehicles, fuels, and transportation demand. This PowerPoint provides an overview of the project and its findings.
Date: March 1, 2013
Creator: unknown
System: The UNT Digital Library

Qualification of U/Mo Research Reactor Fuels

None
Date: March 22, 2011
Creator: Schaaff, T. G.; Belt, V. F.; Likens, A. M.; Joyce, K. E. & Barry, J. F.
System: The UNT Digital Library

Results of First Outdoor Comparison Between Absolute Cavity Pyrgeometer (ACP) and Infrared Integrating Sphere (IRIS) Radiometer at PMOD

The ACP and IRIS are developed to establish a world reference for calibrating pyrgeometers with traceability to SI units. The two radiometers are unwindowed with negligible spectral dependence, and traceable to SI units through the temperature scale (ITS-90). The first outdoor comparison between the two designs was held from January 28 to February 8, 2013 at the Physikalisch-Metorologisches Observatorium Davos (PMOD). The difference between the irradiance measured by ACP and that of IRIS was within 1 W/m2. A difference of 5 W/m2 was observed between the irradiance measured by ACP&IRIS and that of the interim World Infrared Standard Group (WISG).
Date: March 1, 2013
Creator: Reda, I.; Grobner, J.; Wacker, S. & Stoffel, T.
System: The UNT Digital Library

Considerations for a Standardized Test for Potential-Induced Degradation of Crystalline Silicon PV Modules

Over the past decade, there have been observations of module degradation and power loss because of the stress that system voltage bias exerts. This results in part from qualification tests and standards note adequately evaluating for the durability of modules to the long-term effects of high voltage bias that they experience in fielded arrays. This talk deals with factors for consideration, progress, and information still needed for a standardized test for degradation due to system voltage stress.
Date: March 1, 2012
Creator: Hacke, P.
System: The UNT Digital Library

Pyrgeometer Calibration for DOE-Atmospheric System Research Program Using NREL Method

Presented at the DOE-Atmospheric System Research Program, Science Team Meeting, 15-19 March 2010, Bethesda, Maryland. The presentation: Pyrgeometer Calibration for DOE-Atmospheric System Research program using NREL Method - was presented by Ibrahim Reda and Tom Stoffel on March 15, 2010 at the 2010 ASR Science Team Meeting. March 15-19, 2010, Bethesda, Maryland.
Date: March 15, 2010
Creator: Reda, I. & Stoffel, T.
System: The UNT Digital Library

Fuel Cells on Bio-Gas

The conclusions of this presentation are: (1) Fuel cells operating on bio-gas offer a pathway to renewable electricity generation; (2) With federal incentives of $3,500/kW or 30% of the project costs, reasonable payback periods of less than five years can be achieved; (3) Tri-generation of electricity, heat, and hydrogen offers an alternative route to solving the H{sub 2} infrastructure problem facing fuel cell vehicle deployment; and (4) DOE will be promoting bio-gas fuel cells in the future under its Market Transformation Programs.
Date: March 4, 2009
Creator: Remick, R. J.
System: The UNT Digital Library

United States National Hydrogen Fuel Cell Vehicle and Infrastructure Learning Demonstration - Status and Results

This presentation provides status and results for the United States National Hydrogen Fuel Cell Vehicle Learning Demonstration, including project objectives, partners, the National Renewable Energy Laboratory's role in the project and methodology, how to access complete results, and results of vehicle and infrastructure analysis.
Date: March 6, 2009
Creator: Wipke,K.; Sprik, S.; Kurtz, J.; Ramsden, T. & Garbak, J.
System: The UNT Digital Library

Wind Plant Cost of Energy: Past and Future

This presentation examines trends in wind plant cost of energy over the last several decades and discusses methods and examples of projections for future cost trends. First, the presentation explores cost trends for wind energy from the 1980s, where there had been an overall downward trend in wind plant energy costs. Underlying factors that influenced these trends, including turbine technology innovation for lower wind speed sites, are explored. Next, the presentation looks at projections for the future development of wind energy costs and discusses a variety of methods for establishing these projections including the use of learning curves, qualitative assessment using expert elicitation, and engineering-based analysis. A comparison of the methods is provided to explore their relative merits. Finally, a brief introduction is provided for the U.S. Department of Energy program-wide shift towards an integrative use of qualitative and quantitative methods for assessing the potential impacts of wind plant technology innovations on reducing the wind plant cost of energy.
Date: March 1, 2013
Creator: Hand, M. Maureen
System: The UNT Digital Library

Giant Leap Forward Toward Quality Assurance of PV Modules

The presentation describes the composition of and motivation for the International PV QA Task Force, then describes the presentations and discussion that occurred at the workshop on Feb. 29th, 2012.
Date: March 1, 2012
Creator: Kurtz, S.; Wohlgemuth, J.; Sample, T. & Yamamichi, M.
System: The UNT Digital Library

Comparison of Accelerated Testing with Modeling to Predict Lifetime of CPV Solder Layers

Concentrating photovoltaic (CPV) cell assemblies can fail due to thermomechanical fatigue in the die-attach layer. In this presentation, we show the latest results from our computational model of thermomechanical fatigue. The model is used to estimate the relative lifetime of cell assemblies exposed to various temperature histories consistent with service and with accelerated testing. We also present early results from thermal cycling experiments designed to help validate the computational model.
Date: March 1, 2012
Creator: Silverman, T. J.; Bosco, N. & Kurtz, S.
System: The UNT Digital Library

CIGS Material and Device Stability: A Processing Perspective

This is a general overview of CIGS material and device fundamentals. In the first part, the basic features of high efficiency CIGS absorbers and devices are described. In the second part, some examples of previous collaboration with Shell Solar CIGSS graded absorbers and devices are shown to illustrate how process information was used to correct deviations and improve the performance and stability.
Date: March 1, 2012
Creator: Ramanathan, K.
System: The UNT Digital Library

DLR TRANS-CSP Study Applied to North America

None
Date: March 1, 2007
Creator: Price, H. W.
System: The UNT Digital Library

Battery Requirements and Cost-Benefit Analysis for Plug-In Hybrid Vehicles

None
Date: March 1, 2007
Creator: Pesaran, A. & Markel, T.
System: The UNT Digital Library

Grid Impacts of Wind Power Variability: Recent Assessments from a Variety of Utilities in the United States

Presentation for the European Wind Energy Conference held February 27--March 2, 2006, in Athens, Greece, showing grid impacts of wind power variability.
Date: March 1, 2006
Creator: Parsons, B.
System: The UNT Digital Library