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Direct-Steam Linear Fresnel Performance Model for NREL's System Advisor Model

Description: This paper presents the technical formulation and demonstrated model performance results of a new direct-steam-generation (DSG) model in NREL's System Advisor Model (SAM). The model predicts the annual electricity production of a wide range of system configurations within the DSG Linear Fresnel technology by modeling hourly performance of the plant in detail. The quasi-steady-state formulation allows users to investigate energy and mass flows, operating temperatures, and pressure drops for geom… more
Date: September 1, 2012
Creator: Wagner, M. J. & Zhu, G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Development of a Visual Inspection Data Collection Tool for Evaluation of Fielded PV Module Condition

Description: A visual inspection data collection tool for the evaluation of fielded photovoltaic (PV) modules has been developed to facilitate describing the condition of PV modules with regard to field performance. The proposed data collection tool consists of 14 sections, each documenting the appearance or properties of a part of the module. This report instructs on how to use the collection tool and defines each attribute to ensure reliable and valid data collection. This tool has been evaluated through … more
Date: August 1, 2012
Creator: Packard, C. E.; Wohlgemuth, J. H. & Kurtz, S. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

National Utility Rate Database: Preprint

Description: When modeling solar energy technologies and other distributed energy systems, using high-quality expansive electricity rates is essential. The National Renewable Energy Laboratory (NREL) developed a utility rate platform for entering, storing, updating, and accessing a large collection of utility rates from around the United States. This utility rate platform lives on the Open Energy Information (OpenEI) website, OpenEI.org, allowing the data to be programmatically accessed from a web browser, … more
Date: August 1, 2012
Creator: Ong, S. & McKeel, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Scripted Building Energy Modeling and Analysis: Preprint

Description: Building energy modeling and analysis is currently a time-intensive, error-prone, and nonreproducible process. This paper describes the scripting platform of the OpenStudio tool suite (http://openstudio.nrel.gov) and demonstrates its use in several contexts. Two classes of scripts are described and demonstrated: measures and free-form scripts. Measures are small, single-purpose scripts that conform to a predefined interface. Because measures are fairly simple, they can be written or modified by… more
Date: August 1, 2012
Creator: Hale, E.; Macumber, D.; Benne, K. & Goldwasser, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Secure Data Center (Fact Sheet)

Description: This fact sheet describes the purpose, lab specifications, applications scenarios, and information on how to partner with NREL's Secure Data Center at the Energy Systems Integration Facility.
Date: August 1, 2012
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Value of Geographic Diversity of Wind and Solar: Stochastic Geometry Approach; Preprint

Description: Based on the available geographically dispersed data for the continental U.S. (excluding Alaska), we analyze to what extent the geographic diversity of these resources can offset their variability. A geometric model provides a convenient measure for resource variability, shows the synergy between wind and solar resources.
Date: August 1, 2012
Creator: Diakov, V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

High Temperature, high pressure equation of state density correlations and viscosity correlations

Description: Global increase in oil demand and depleting reserves has derived a need to find new oil resources. To find these untapped reservoirs, oil companies are exploring various remote and harsh locations such as deep waters in Gulf of Mexico, remote arctic regions, unexplored deep deserts, etc. Further, the depth of new oil/gas wells being drilled has increased considerably to tap these new resources. With the increase in the well depth, the bottomhole temperature and pressure are also increasing to e… more
Date: July 31, 2012
Creator: Tapriyal, D.; Enick, R.; McHugh, M.; Gamwo, I. & Morreale, B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Review of Prior U.S. Attribute Measurement Systems

Description: Attribute Measurement Systems have been developed and demonstrated several times in the United States over the last decade or so; under the Trilateral Initiative (1996-2002), FMTTD (Fissile Material Transparency Technology Demonstration, 2000), and NG-AMS (Next Generation Attribute Measurement System, 2005-2008). Each Attribute Measurement System has contributed to the growing body of knowledge regarding the use of such systems in warhead dismantlement and other Arms Control scenarios. The Tril… more
Date: July 6, 2012
Creator: White, G K
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Modeling, Analysis and Simulation of Multiscale Preferential Flow - 8/05-8/10 - Final Report

Description: The research agenda of this project are: (1) Modeling of preferential transport from mesoscale to macroscale; (2) Modeling of fast flow in narrow fractures in porous media; (3) Pseudo-parabolic Models of Dynamic Capillary Pressure; (4) Adaptive computational upscaling of flow with inertia from porescale to mesoscale; (5) Adaptive modeling of nonlinear coupled systems; and (6) Adaptive modeling and a-posteriori estimators for coupled systems with heterogeneous data.
Date: July 3, 2012
Creator: Showalter, Ralph & Peszynska, Malgorzata
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Scientific Data Management Integrated Software Infrastructure Center (SDM/ISIC): Scientific Process Automation (SPA), FINAL REPORT

Description: This is the final report from SDSC and UC Davis on DE-FC02-01ER25486, Scientific Data Management Integrated Software Infrastructure Center (SDM/ISIC): Scientific Process Automation (SPA).
Date: July 3, 2012
Creator: Ludaescher, Bertram & Altintas, Ilkay
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Assessment of the U.S. Department of Energy's Home Energy Scoring Tool

Description: The National Renewable Energy Laboratory (NREL) conducted a series of assessments of the U.S. Department of Energy's (DOE) proposed Home Energy Scoring Tool (HEST). This report is an assessment of the 4/27/2012 release of HEST. Predictions of electric and natural gas consumption were compared with weather-normalized utility billing data for a mixture of newer and older homes located in Oregon, Wisconsin, Minnesota, North Carolina and Texas.
Date: July 1, 2012
Creator: Roberts, D.; Merket, N.; Polly, B.; Heaney, M.; Casey, S. & Robertson, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Comparison of Capacity Value Methods for Photovoltaics in the Western United States

Description: This report compares different capacity value estimation techniques applied to solar photovoltaics (PV). It compares more robust data and computationally intense reliability-based capacity valuation techniques to simpler approximation techniques at 14 different locations in the western United States. The capacity values at these locations are computed while holding the underlying power system characteristics fixed. This allows the effect of differences in solar availability patterns on the capa… more
Date: July 1, 2012
Creator: Madaeni, S. H.; Sioshansi, R. & Denholm, P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Computer Simulations Reveal Multiple Functions for Aromatic Residues in Cellulase Enzymes (Fact Sheet)

Description: NREL researchers use high-performance computing to demonstrate fundamental roles of aromatic residues in cellulase enzyme tunnels. National Renewable Energy Laboratory (NREL) computer simulations of a key industrial enzyme, the Trichoderma reesei Family 6 cellulase (Cel6A), predict that aromatic residues near the enzyme's active site and at the entrance and exit tunnel perform different functions in substrate binding and catalysis, depending on their location in the enzyme. These results sugges… more
Date: July 1, 2012
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

U.S. Renewable Energy Technical Potentials: A GIS-Based Analysis

Description: This report presents the state-level results of a spatial analysis effort calculating energy technical potential, reported in square kilometers of available land, megawatts of capacity, and gigawatt-hours of generation, for six different renewable technologies. For this analysis, the system specific power density (or equivalent), efficiency (capacity factor), and land-use constraints were identified for each technology using independent research, published research, and professional contacts. T… more
Date: July 1, 2012
Creator: Lopez, A.; Roberts, B.; Heimiller, D.; Blair, N. & Porro, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

What Scientific Applications can Benefit from Hardware Transactional Memory?

Description: Achieving efficient and correct synchronization of multiple threads is a difficult and error-prone task at small scale and, as we march towards extreme scale computing, will be even more challenging when the resulting application is supposed to utilize millions of cores efficiently. Transactional Memory (TM) is a promising technique to ease the burden on the programmer, but only recently has become available on commercial hardware in the new Blue Gene/Q system and hence the real benefit for rea… more
Date: June 4, 2012
Creator: Schindewolf, M; Bihari, B; Gyllenhaal, J; Schulz, M; Wang, A & Karl, W
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Case Studies Comparing System Advisor Model (SAM) Results to Real Performance Data: Preprint

Description: NREL has completed a series of detailed case studies comparing the simulations of the System Advisor Model (SAM) and measured performance data or published performance expectations. These case studies compare PV measured performance data with simulated performance data using appropriate weather data. The measured data sets were primarily taken from NREL onsite PV systems and weather monitoring stations.
Date: June 1, 2012
Creator: Blair, N.; Dobos, A. & Sather, N.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Glycosylation Helps Cellulase Enzymes Bind to Plant Cell Walls (Fact Sheet)

Description: Computer simulations suggest a new strategy to design enhanced enzymes for biofuels production. Large-scale computer simulations predict that the addition of glycosylation on carbohydrate-binding modules can dramatically improve the binding affinity of these protein domains over amino acid mutations alone. These simulations suggest that glycosylation can be used as a protein engineering tool to enhance the activity of cellulase enzymes, which are a key component in the conversion of cellulose t… more
Date: June 1, 2012
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

P50/P90 Analysis for Solar Energy Systems Using the System Advisor Model: Preprint

Description: To secure competitive financing for a solar energy generation project, the economic risk associated with interannual solar resource variability must be quantified. One way to quantify this risk is to calculate exceedance probabilities representing the amount of energy expected to be produced by a plant. Many years of solar radiation and metereological data are required to determine these values, often called P50 or P90 values for the level of certainty they represent. This paper describes the t… more
Date: June 1, 2012
Creator: Dobos, A. P.; Gilman, P. & Kasberg, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

U.S. Department of Energy Workshop Report: Solar Resources and Forecasting

Description: This report summarizes the technical presentations, outlines the core research recommendations, and augments the information of the Solar Resources and Forecasting Workshop held June 20-22, 2011, in Golden, Colorado. The workshop brought together notable specialists in atmospheric science, solar resource assessment, solar energy conversion, and various stakeholders from industry and academia to review recent developments and provide input for planning future research in solar resource character… more
Date: June 1, 2012
Creator: Stoffel, T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Integration of Heat Transfer, Stress, and Particle Trajectory Simulation

Description: Calabazas Creek Research, Inc. developed and currently markets Beam Optics Analyzer (BOA) in the United States and abroad. BOA is a 3D, charged particle optics code that solves the electric and magnetic fields with and without the presence of particles. It includes automatic and adaptive meshing to resolve spatial scales ranging from a few millimeters to meters. It is fully integrated with CAD packages, such as SolidWorks, allowing seamless geometry updates. The code includes iterative procedur… more
Date: May 17, 2012
Creator: Bui, Thuc; Read, Michael & Ives, Lawrence
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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