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Cell Data Sheet Specification

Description: The presentation shows a brief status report on the development of a specification being considered by IEC TC82 WG7 for a concentrator cell data sheet and solicits suggestions from the community.
Date: March 1, 2012
Creator: Kurtz, S.

CIGS Material and Device Stability: A Processing Perspective

Description: 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.

Colorado New Energy Summit

Description: Presentation by Dr. Dan Arvizu of NREL given at the Colorado New Energy Summit held March 24, 2007 in Denver, Colorado.
Date: March 24, 2007
Creator: Arvizu, D. E.

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

Description: 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 mode… more
Date: March 1, 2012
Creator: Silverman, T. J.; Bosco, N. & Kurtz, S.

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

Description: 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 stre… more
Date: March 1, 2012
Creator: Hacke, P.

Development of chromium-tungsten alloys

Description: Cr alloys containing 0-30 weight % W were investigated for their high temperature strength and oxidation resistance. These experimental alloys are intended for use in elevated temperature applications. Alloys were melted in a water-cooled, copper-hearth arc furnace. Microstructure of the alloys was studied using X-ray diffraction, scanning electron microscopy, and light microscopy. Meyer and Vickers hardness tests were utilized for measuring room temperature strength. A hot hardness tester with… more
Date: March 1, 2004
Creator: Dogan, Omer N.; Alman, David E. & Hawk, Jeffrey A.

Durability of Polymeric Encapsulation Materials for Concentrating Photovoltaic Systems

Description: 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 fa… more
Date: March 1, 2012
Creator: Miller, D. C.; Muller, M.; Kempe, M. D.; Araki, K.; Kennedy, C. E. & Kurtz, S. R.

ESPC Intro and ESPC/PPAs for RE (Presentation)

Description: 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: Dahle, D.

Experience with CPV Module Failures at NREL

Description: The failures and performance issues associated with three years of on-sun testing of CPV modules are discussed. Pictures of various failure mechanisms and performance issues are presented. A wide array of CPV module failures and performance issues have been experienced at NREL. Many of the modules are prototypes and have not been through qualification testing. It is assumed that the qualification test would have captured many of the problems. Internal lens soiling due to condensation is not cur… more
Date: March 1, 2012
Creator: Muller, M.

Factors Controlling In Situ Uranium and Technetium Bioreductionat the NABIR Field Research Center

Description: This research hypotheses is: (1) Indigenous microorganisms in the shallow aquifer at the FRC have the capability to reduce U(VI) and Tc(VII) but rates are limited by--Scarce electron donor, Low pH and potentially toxic metals, and High nitrate. (2) U(VI) and Tc(VII) reduction rates can be increased by--Successive donor additions, Raising pH to precipitate toxic metals, and Adding humics to complex toxic metals and serve as electron shuttles.
Date: March 17, 2004
Creator: Istok, J.; Jones, J.; Park, M.; Sapp, M.; Selko, E.; Laughman, R. et al.

Fuel Cell Vehicle Learning Demonstration: Spring 2007 Results

Description: This presentation provides the results, as of Spring 2007, for the fuel cell vehicle learning demonstration conducted by the National Renewable Energy Laboratory.
Date: March 20, 2007
Creator: Wipke, K.; Sprik, S.; Thomas, H.; Welch, C.; Gronich, S. & Garbak, J.

Fuel Cells on Bio-Gas

Description: 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 u… more
Date: March 4, 2009
Creator: Remick, R. J.

Geobacter Project

Description: Analysis of the Genetic Potential and Gene Expression of Microbial Communities Involved in the In Situ Bioremediation of Uranium and Harvesting Electrical Energy from Organic Matter The primary goal of this research is to develop conceptual and computational models that can describe the functioning of complex microbial communities involved in microbial processes of interest to the Department of Energy. Microbial Communities to be Investigated: (1) Microbial community associated with the in situ… more
Date: March 17, 2004
Creator: Lovley, Derek; Coppi, Maddalena; Ciufo, Stacy; Methe, Barbara; Pablo, Pomposiello; Sandler, Steve et al.

Getting from Goals to Projects in the Ground (Presentation)

Description: 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.
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