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Note: This page contains sample records for the topic "large scale wind" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
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1

Large-Scale Offshore Wind Power  

NLE Websites -- All DOE Office Websites (Extended Search)

Large-Scale Offshore Wind Power in the United States EXECUTIVE SUMMARY September 2010 NOTICE This report was prepared as an account of work sponsored by an agency of the United...

2

Superconductivity for Large Scale Wind Turbines  

SciTech Connect

A conceptual design has been completed for a 10MW superconducting direct drive wind turbine generator employing low temperature superconductors for the field winding. Key technology building blocks from the GE Wind and GE Healthcare businesses have been transferred across to the design of this concept machine. Wherever possible, conventional technology and production techniques have been used in order to support the case for commercialization of such a machine. Appendices A and B provide further details of the layout of the machine and the complete specification table for the concept design. Phase 1 of the program has allowed us to understand the trade-offs between the various sub-systems of such a generator and its integration with a wind turbine. A Failure Modes and Effects Analysis (FMEA) and a Technology Readiness Level (TRL) analysis have been completed resulting in the identification of high risk components within the design. The design has been analyzed from a commercial and economic point of view and Cost of Energy (COE) calculations have been carried out with the potential to reduce COE by up to 18% when compared with a permanent magnet direct drive 5MW baseline machine, resulting in a potential COE of 0.075 $/kWh. Finally, a top-level commercialization plan has been proposed to enable this technology to be transitioned to full volume production. The main body of this report will present the design processes employed and the main findings and conclusions.

R. Fair; W. Stautner; M. Douglass; R. Rajput-Ghoshal; M. Moscinski; P. Riley; D. Wagner; J. Kim; S. Hou; F. Lopez; K. Haran; J. Bray; T. Laskaris; J. Rochford; R. Duckworth

2012-10-12T23:59:59.000Z

3

Wind Scanner: A full-scale Laser Facility for Wind and Turbulence Measurements around large Wind Turbines  

E-Print Network (OSTI)

Wind Scanner: A full-scale Laser Facility for Wind and Turbulence Measurements around large Wind Turbines Torben Mikkelsen, Jakob Mann and Michael Courtney Wind Energy Department, Risø National Laboratory:Torben.Mikkelsen@Risoe.dk Summary RIS� DTU has started to build a newly designed laser-based lidar scanning facility for remote wind

4

Variability of Load and Net Load in Case of Large Scale Distributed Wind Power  

Science Conference Proceedings (OSTI)

Large scale wind power production and its variability is one of the major inputs to wind integration studies. This paper analyses measured data from large scale wind power production. Comparisons of variability are made across several variables: time scale (10-60 minute ramp rates), number of wind farms, and simulated vs. modeled data. Ramp rates for Wind power production, Load (total system load) and Net load (load minus wind power production) demonstrate how wind power increases the net load variability. Wind power will also change the timing of daily ramps.

Holttinen, H.; Kiviluoma, J.; Estanqueiro, A.; Gomez-Lazaro, E.; Rawn, B.; Dobschinski, J.; Meibom, P.; Lannoye, E.; Aigner, T.; Wan, Y. H.; Milligan, M.

2011-01-01T23:59:59.000Z

5

Potential Climatic Impacts and Reliability of Very Large-Scale Wind Farms  

E-Print Network (OSTI)

Meeting future world energy needs while addressing climate change requires large-scale deployment of low or zero greenhouse gas (GHG) emission technologies such as wind energy. The widespread availability of wind power has ...

Wang, Chien

6

NREL: Wind Research - Large Wind Turbine Research  

NLE Websites -- All DOE Office Websites (Extended Search)

Wind Research Search More Search Options Site Map Printable Version Large Wind Turbine Research NREL's utility scale wind system research addresses performance and...

7

Large-scale structure of the fast solar wind  

E-Print Network (OSTI)

2001), Connecting the Sun and the Solar Wind: Comparison of592: Solar Wind 11/SOHO 16, Connecting Sun and Heliosphere,scenario, the fast solar wind from the quiet Sun wind would

Bisi, M. M.; Fallows, R. A.; Breen, A. R.; Habbal, S. Rifai; Jones, R. A.

2007-01-01T23:59:59.000Z

8

The Association of Large-Scale Climate Variability and Teleconnections on Wind Energy Resource  

E-Print Network (OSTI)

The Association of Large-Scale Climate Variability and Teleconnections on Wind Energy Resource over on Wind Energy Resource over Europe and its Intermittency Pascal Kriesche* and Adam Schlosser* Abstract In times of increasing importance of wind power in the world's energy mix, this study focuses on a better

9

Large-scale structure of the fast solar wind  

E-Print Network (OSTI)

measurements of Solar Wind velocity, in press, Journal of1992), The Ulysses solar wind plasma experiment, AstronomyA. Hewish (1967), The solar wind outside the plane of the

Bisi, M. M.; Fallows, R. A.; Breen, A. R.; Habbal, S. Rifai; Jones, R. A.

2007-01-01T23:59:59.000Z

10

VP 100: New Facility in Boston to Test Large-Scale Wind Blades | Department  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

VP 100: New Facility in Boston to Test Large-Scale Wind Blades VP 100: New Facility in Boston to Test Large-Scale Wind Blades VP 100: New Facility in Boston to Test Large-Scale Wind Blades July 23, 2010 - 1:19pm Addthis Boston's Wind Technology Testing Center, funded in part with Recovery Act funds, will be first in U.S. to test blades up to 300 feet long. | Photo Courtesy of Massachusetts Clean Energy Center Boston's Wind Technology Testing Center, funded in part with Recovery Act funds, will be first in U.S. to test blades up to 300 feet long. | Photo Courtesy of Massachusetts Clean Energy Center Stephen Graff Former Writer & editor for Energy Empowers, EERE America's first-of-its-kind wind blade testing facility - capable of testing a blade as long as a football field - almost never was. Because of funding woes, the Massachusetts Clean Energy Center (MassCEC),

11

Large-scale structure of the fast solar wind  

E-Print Network (OSTI)

Scintillation measurements of Solar Wind velocity, in press,K. Sakurai (1992), The Ulysses solar wind plasma experiment,Telescope for the SOHO Mission, Solar Physics, 162, 291–312.

Bisi, M. M.; Fallows, R. A.; Breen, A. R.; Habbal, S. Rifai; Jones, R. A.

2007-01-01T23:59:59.000Z

12

Effect of Large-Scale Wind Farm on Transient Stability  

Science Conference Proceedings (OSTI)

Faced with the sever situation about the environment and the fuel under the earth, people are now resorting to clean energy, especially the wind power because of their many advantages, to meet their ever increasing demand for power electricity. Therefore, ... Keywords: wind farm, transient stability, voltage oscillations, network structures, wind power penetration level, critical clearing time (CCT)

Yanxu Chen; Zifa Liu

2010-06-01T23:59:59.000Z

13

Large-Scale Wind Integration Studies in the United States: Preliminary Results  

DOE Green Energy (OSTI)

The National Renewable Energy Laboratory, under the sponsorship of the U.S. Department of Energy, is managing two large-scale wind integration studies. The Western Wind and Solar Integration Study (WWSIS) covers the footprint of WestConnect, a group of transmission owners that covers most of Colorado, New Mexico, Arizona, Nevada, and Wyoming. The Eastern Wind Integration and Transmission Study (EWITS) covers a large part of the Eastern Interconnection, and leverages a large-scale transmission study known as the Joint Coordinated System Plan (JCSP). Both studies analyze the impact of 20-30% wind energy penetration within the study footprint based on energy. This paper discusses key results that have emerged so far from each study, focusing primarily on simulation results based on hourly production simulations. Results from both studies show that high wind penetrations can be successfully integrated into the power system, but depend on sufficient transmission and significant changes in operations.

Milligan, M.; Lew, D.; Corbus, D.; Piwko, R.; Miller, N.; Clark, K.; Jordan, G.; Freeman, L.; Zavadil, B.; Schuerger, M.

2009-01-01T23:59:59.000Z

14

The Association of Large-Scale Climate Variability and Teleconnections on Wind Energy Resource over Europe and its Intermittency  

E-Print Network (OSTI)

In times of increasing importance of wind power in the world’s energy mix, this study focuses on a better understanding of the influences of large-scale climate variability on wind power resource over Europe. The impact ...

Kriesche, Pascal

15

Large Scale, Low Frequency Variability of the 1979 FGGE Surface Buoy Drifts and Winds over the Southern Hemisphere  

Science Conference Proceedings (OSTI)

The surface response of the Southern Hemisphere's oceans to the large spatial scale, interseasonal changes in wind forcing during the FGGE year of 1979 is investigated. The primary data are the analyzed daily wind fields, and the trajectories of ...

W. G. Large; H. Van Loon

1989-02-01T23:59:59.000Z

16

Diagnostic Downscaling of Large-Scale Wind Fields to Compute Local-Scale Trajectories  

Science Conference Proceedings (OSTI)

This paper describes a simple method, based on routine meteorological data, to produce high-resolution wind analyses throughout the planetary boundary layer (PBL). It is a new way to interpolate wind measurements. According to this method, high-...

Andreas Stohl; Kathrin Baumann; Gerhard Wotawa; Matthias Langer; Bruno Neininger; Martin Piringer; Herbert Formayer

1997-07-01T23:59:59.000Z

17

ARRA-Multi-Level Energy Storage and Controls for Large-Scale Wind Energy Integration  

DOE Green Energy (OSTI)

The Project Objective is to design innovative energy storage architecture and associated controls for high wind penetration to increase reliability and market acceptance of wind power. The project goals are to facilitate wind energy integration at different levels by design and control of suitable energy storage systems. The three levels of wind power system are: Balancing Control Center level, Wind Power Plant level, and Wind Power Generator level. Our scopes are to smooth the wind power fluctuation and also ensure adequate battery life. In the new hybrid energy storage system (HESS) design for wind power generation application, the boundary levels of the state of charge of the battery and that of the supercapacitor are used in the control strategy. In the controller, some logic gates are also used to control the operating time durations of the battery. The sizing method is based on the average fluctuation of wind profiles of a specific wind station. The calculated battery size is dependent on the size of the supercapacitor, state of charge of the supercapacitor and battery wear. To accommodate the wind power fluctuation, a hybrid energy storage system (HESS) consisting of battery energy system (BESS) and super-capacitor is adopted in this project. A probability-based power capacity specification approach for the BESS and super-capacitors is proposed. Through this method the capacities of BESS and super-capacitor are properly designed to combine the characteristics of high energy density of BESS and the characteristics of high power density of super-capacitor. It turns out that the super-capacitor within HESS deals with the high power fluctuations, which contributes to the extension of BESS lifetime, and the super-capacitor can handle the peaks in wind power fluctuations without the severe penalty of round trip losses associated with a BESS. The proposed approach has been verified based on the real wind data from an existing wind power plant in Iowa. An intelligent controller that increases battery life within hybrid energy storage systems for wind application was developed. Comprehensive studies have been conducted and simulation results are analyzed. A permanent magnet synchronous generator, coupled with a variable speed wind turbine, is connected to a power grid (14-bus system). A rectifier, a DC-DC converter and an inverter are used to provide a complete model of the wind system. An Energy Storage System (ESS) is connected to a DC-link through a DC-DC converter. An intelligent controller is applied to the DC-DC converter to help the Voltage Source Inverter (VSI) to regulate output power and also to control the operation of the battery and supercapacitor. This ensures a longer life time for the batteries. The detailed model is simulated in PSCAD/EMTP. Additionally, economic analysis has been done for different methods that can reduce the wind power output fluctuation. These methods are, wind power curtailment, dumping loads, battery energy storage system and hybrid energy storage system. From the results, application of single advanced HESS can save more money for wind turbines owners. Generally the income would be the same for most of methods because the wind does not change and maximum power point tracking can be applied to most systems. On the other hand, the cost is the key point. For short term and small wind turbine, the BESS is the cheapest and applicable method while for large scale wind turbines and wind farms the application of advanced HESS would be the best method to reduce the power fluctuation. The key outcomes of this project include a new intelligent controller that can reduce energy exchanged between the battery and DC-link, reduce charging/discharging cycles, reduce depth of discharge and increase time interval between charge/discharge, and lower battery temperature. This improves the overall lifetime of battery energy storages. Additionally, a new design method based on probability help optimize the power capacity specification for BESS and super-capacitors. Recommendations include experimental imp

David Wenzhong Gao

2012-09-30T23:59:59.000Z

18

On the Role of Antarctic Katabatic Winds in Forcing Large-Scale Tropospheric Motions  

Science Conference Proceedings (OSTI)

Katabatic winds are a dominant feature of the lower atmosphere over Antarctica. The radial diffluence displayed by the drainage flows implies that a continental-scale subsidence is present over Antarctica. From mass continuity considerations, a ...

Thomas R. Parish

1992-08-01T23:59:59.000Z

19

Large-Scale Wind Integration Studies in the United States: Preliminary Results; Preprint  

SciTech Connect

The National Renewable Energy Laboratory is managing two large regional wind integration studies on behalf of the United States Department of Energy. These two studies are believed to be the largest ever undertaken in the United States.

Milligan, M.; Lew, D.; Corbus, D.; Piwko, R.; Miller, N.; Clark, K.; Jordan, G.; Freeman, L.; Zavadil, B.; Schuerger, M.

2009-09-01T23:59:59.000Z

20

Techno-economic Modeling of the Integration of 20% Wind and Large-scale Energy Storage in ERCOT by 2030  

SciTech Connect

This study�¢����s objective is to examine interrelated technical and economic avenues for the Electric Reliability Council of Texas (ERCOT) grid to incorporate up to and over 20% wind generation by 2030. Our specific interests are to look at the factors that will affect the implementation of both high level of wind power penetration (> 20% generation) and installation of large scale storage.

Ross Baldick; Michael Webber; Carey King; Jared Garrison; Stuart Cohen; Duehee Lee

2012-12-21T23:59:59.000Z

Note: This page contains sample records for the topic "large scale wind" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Small Solar Wind Transients and Their Connection to the Large-Scale Coronal Structure  

E-Print Network (OSTI)

I.G. : 2006, In situ solar wind and magnetic ?eld signaturesE. : 2008, The IMPACT Solar Wind Electron Analyzer (SWEA).Heliospheric images of the solar wind at Earth. Astrophys.

2009-01-01T23:59:59.000Z

22

Small Solar Wind Transients and Their Connection to the Large-Scale Coronal Structure  

E-Print Network (OSTI)

I.G. : 2006, In situ solar wind and magnetic ?eld signaturesPenou, E. : 2008, The IMPACT Solar Wind Electron Analyzer (Heliospheric images of the solar wind at Earth. Astrophys.

2009-01-01T23:59:59.000Z

23

Model and Seismic Analysis of Large-scale Wind Turbine Tower Structure  

Science Conference Proceedings (OSTI)

The working condition of wind turbine tower structure with a massive engine room and revolving wind wheels is very complex. The paper simplify the wind turbine tower model with finite element analysis software --ANSYS, completed modal analysis firstly, ... Keywords: wind turbine tower, model analysis, resonance, time-history analysis, dynamic

Xiang Liu; Jiangtao Kong

2012-05-01T23:59:59.000Z

24

Large-Scale Offshore Wind Power in the United States: Executive Summary  

DOE Green Energy (OSTI)

This document provides a summary of a 236-page NREL report that provides a broad understanding of today's offshore wind industry, the offshore wind resource, and the associated technology challenges, economics, permitting procedures, and potential risks and benefits.

Musial, W.; Ram, B.

2010-09-01T23:59:59.000Z

25

The role of hydroelectric generation in electric power systems with large scale wind generation.  

E-Print Network (OSTI)

??An increasing awareness of the operational challenges created by intermittent generation of electricity from policy-mandated renewable resources, such as wind and solar, has led to… (more)

Hagerty, John Michael

2012-01-01T23:59:59.000Z

26

Large-Scale Offshore Wind Power in the United States: Assessment of Opportunities and Barriers  

DOE Green Energy (OSTI)

This paper assesses the potential for U.S. offshore wind to meet the energy needs of many coastal and Great Lakes states.

Musial, W.; Ram, B.

2010-09-01T23:59:59.000Z

27

New England Wind Forum: Large Wind  

Wind Powering America (EERE)

Small Wind Small Wind Large Wind Newsletter Perspectives Events Quick Links to States CT MA ME NH RI VT Bookmark and Share Large Wind When establishing wind farms, wind energy developers generally approach landowners where they want to build. Interest in wind farms is frequently spurred by external pressures such as tax and other financial incentives and legislative mandates. Since each situation is influenced by local policies and permitting, we can only provide general guidance to help you learn about the process of installing wind turbines. Publications Wind Project Development Process Permitting of Wind Energy Facilities: A Handbook. (August 2002). National Wind Coordinating Collaborative. Landowner Frequently Asked Questions and Answers. (August 2003). "State Wind Working Group Handbook." pp. 130-133.

28

1) INTRODUCTION Reliable and save grid integration of large-scale offshore wind  

E-Print Network (OSTI)

of these results with load profiles and conventional power generation will give insight into crossboarder flows production, forecasted wind power and deviations in the load forecast. Spatial forecast error smoothing. However, the accurate modeling of the vertical wind profile gains importance as in general much higher

Heinemann, Detlev

29

ELECTRIC VEHICLE BASED BATTERY STORAGES FOR LARGE SCALE WIND POWER INTEGRATION  

E-Print Network (OSTI)

Coherent Energy and Environment System Analysis CHP Combined Heat and Power CPP Condensing Power Plant DPL system and the thermal based power systems of Europe through Germany. The Western part of Denmark includes 6500MW of wind power plants (4000MW from distributed onshore wind farms and 2500MW from offshore

Pillai, Jayakrishnan Radhakrishna

30

Estimating Probabilities of Hurricane Wind Speeds Using a Large-Scale Empirical Model  

Science Conference Proceedings (OSTI)

A new method is presented for estimating the probability of exceeding a given wind speed in 1 year at any given location in the Atlantic tropical cyclone basin. The method is especially appropriate for wind speeds with return periods of 100 years ...

R. W. R. Darling

1991-10-01T23:59:59.000Z

31

Large-Scale Offshore Wind Power in the United States: Executive Summary  

SciTech Connect

This document provides a summary of a 236-page NREL report that provides a broad understanding of today's offshore wind industry, the offshore wind resource, and the associated technology challenges, economics, permitting procedures, and potential risks and benefits.

Musial, W.; Ram, B.

2010-09-01T23:59:59.000Z

32

Large-Scale Circulation and Production of Stratification: Effects of Wind, Geometry, and Diffusion  

Science Conference Proceedings (OSTI)

The combined effects of wind, geometry, and diffusion on the stratification and circulation of the ocean are explored by numerical and analytical methods. In particular, the production of deep stratification in a simply configured numerical model ...

Geoffrey K. Vallis

2000-05-01T23:59:59.000Z

33

Potential Climatic Impacts and Reliability of Large-Scale Offshore Wind Farms  

E-Print Network (OSTI)

The vast availability of wind power has fueled substantial interest in this renewable energy source as a potential near-zero greenhouse gas emission technology for meeting future world energy needs while addressing the ...

Wang, Chien

34

The role of hydroelectric generation in electric power systems with large scale wind generation  

E-Print Network (OSTI)

An increasing awareness of the operational challenges created by intermittent generation of electricity from policy-mandated renewable resources, such as wind and solar, has led to increased scrutiny of the public policies ...

Hagerty, John Michael

2012-01-01T23:59:59.000Z

35

Impacts of Large-Scale Wind Generators Penetration on the Voltage Stability of Power Systems  

E-Print Network (OSTI)

by 2020 and 300 GW of installed wind power capacity in Europe by 2030. An overview of the historical to make energy available economically with reduced carbon emission using renewable energy sources-limiting factor. FACTS controllers have been used for solving various power system steady-state control problems

Pota, Himanshu Roy

36

Definition: Commercial Scale Wind | Open Energy Information  

Open Energy Info (EERE)

Scale Wind Commercial scale wind refers to wind energy projects greater than 100 kW. The electricity that is generated is sold.1 Also Known As Utility-Scale Wind Related Terms...

37

Surface Layer Transport of Sulfate Particles in the Western United States by the Large-Scale Wind Field  

Science Conference Proceedings (OSTI)

The transport patterns of fine sulfur aerosols in the western United States are shown. The large-scale resultant horizontal flux was computed in terms of that contributed by the mean flux versus that contributed by a turbulence, or eddy, ...

Lowell L. Ashbaugh; Leonard O. Myrup; Robert G. Flocchini

1984-05-01T23:59:59.000Z

38

Status of the large wind turbine handbook  

DOE Green Energy (OSTI)

The site-selection strategy presented here and in the LWH is conservative, partially because utilities are conservative. They should be. The large-scale generation of electricity by wind turbine generators is an unproven technology. It is assumed that wind characteristics at a site will have to be thoroughly documented. This is because the nature of the wind at the site not only governs the energy output of the WECS farm, but also affects the service life of the wind equipment and both scheduled and unscheduled maintenance costs. Perhaps as experience is gained, the site-selection process can be simplified. Certain steps may be found unnecessary, or requirements on the quantity and quality of wind data collected at each step may be relaxed; however, at this stage of wind energy development, a conservative approach seems prudent.

Heister, T. R.; Pennell, W. T.

1979-12-01T23:59:59.000Z

39

Large-Scale Hydropower  

Energy.gov (U.S. Department of Energy (DOE))

Large-scale hydropower plants are generally developed to produce electricity for government or electric utility projects. These plants are more than 30 MW in size, and there is more than 80,000 MW...

40

7th International Workshop on Large-Scale Integration of Wind Power and on Transmission Networks for Offshore Wind Farms Models for HLI analysis of power systems with  

E-Print Network (OSTI)

export? BACKGROUND The last decade has seen a remarkable increase in the number of wind installations. In Europe, Denmark is amongst the leading countries in wind generation in terms of installed capacity the consequences and challenges of high rates of wind generation from both a technical and economic perspective

Bak-Jensen, Birgitte

Note: This page contains sample records for the topic "large scale wind" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Coupled Dynamic Analysis of Large-Scale Mono-Column Offshore Wind Turbine with a Single Tether Hinged in Seabed  

E-Print Network (OSTI)

The increased interest in the offshore wind resource in both industry and academic and the extension of the wind field where offshore wind turbine can be deployed has stimulated quite a number of offshore wind turbines concepts. This thesis presents a design of mono-column platform supported for 5 MW baseline wind turbine developed by the National Renewable Energy Laboratory (NREL), with a single tether anchored to the seabed. The design, based on the pioneer concept SWAY, results from parametric optimized design processes which account for important design considerations in the static and dynamic view, such as the stability, natural frequency, performance requirements as well as the economic feasibility. Fully coupled aero-hydro-servo-elastic model is established in the time-domain simulation tool FAST (Fatigue, Aerodynamics, Structures, and Turbulence) with the hydrodynamic coefficients from HydroGen, an indoor program providing same outputs as the commercial software WAMIT. The optimized model is verified by imitating the frequency-domain approach in FAST and thus comparing the results with the frequency-domain calculations. A number of simulations with various wind and wave conditions are run to explore the effect of wind speed and wave significant height in various water depths. By modifying the optimized model to a downwind turbine with the nacelle rigidly mounted on the tower and the single tether connected to the platform by a subsea swivel, the modified models are more closed to the original SWAY-concept wind turbine. These models are compared based on the platform motion, tether tension, displacement, nacelle velocity and acceleration, resonant behavior as well as the damping of the coupled systems. The results of these comparisons prove the advantage of the modified model in performance. The modified model has also clarified itself a good candidate for deep water deployment.

Chen, Jieyan

2012-08-01T23:59:59.000Z

42

Utility Scale Wind turbine Demonstration Project  

SciTech Connect

The purpose of the Three Affiliated Tribes proposing to Department of Energy was nothing new to Denmark. National Meteorological Studies have proved that North Dakota has some of the most consistence wind resources in the world. The Three Affiliated Tribes wanted to assess their potential and become knowledgeable to developing this new and upcoming resource now valuable. By the Tribe implementing the Utility-scale Wind Turbine Project on Fort Berthold, the tribe has proven the ability to complete a project, and has already proceeded in a feasibility studies to developing a large-scale wind farm on the reservation due to tribal knowledge learned, public awareness, and growing support of a Nation wanting clean renewable energy. The tribe is working through the various measures and regulations with the want to be self-sufficient, independent, and marketable with 17,000 times the wind energy needed to service Fort Berthold alone.

Terry Fredericks

2006-03-31T23:59:59.000Z

43

76 IEEE SYSTEMS JOURNAL, VOL. 6, NO. 1, MARCH 2012 Investigation of the Impacts of Large-Scale Wind  

E-Print Network (OSTI)

with higher installed capacity than the connected conventional generation. This increased amount of wind available economically with reduced carbon emission using renewable energy sources. In recent years, power transmission system (FACTS) controllers have been used for solving various power system steady-state control

Pota, Himanshu Roy

44

Definition: Small Scale Wind | Open Energy Information  

Open Energy Info (EERE)

Small scale wind projects are typically defined as projects with capacity ratings of 1 - 100 kW.1 View on Wikipedia Wikipedia Definition Related Terms wind power, wind energy,...

45

Passive load control for large wind turbines.  

DOE Green Energy (OSTI)

Wind energy research activities at Sandia National Laboratories focus on developing large rotors that are lighter and more cost-effective than those designed with current technologies. Because gravity scales as the cube of the blade length, gravity loads become a constraining design factor for very large blades. Efforts to passively reduce turbulent loading has shown significant potential to reduce blade weight and capture more energy. Research in passive load reduction for wind turbines began at Sandia in the late 1990's and has moved from analytical studies to blade applications. This paper discusses the test results of two Sandia prototype research blades that incorporate load reduction techniques. The TX-100 is a 9-m long blade that induces bend-twist coupling with the use of off-axis carbon in the skin. The STAR blade is a 27-m long blade that induces bend-twist coupling by sweeping the blade in a geometric fashion.

Ashwill, Thomas D.

2010-05-01T23:59:59.000Z

46

Stakeholder Engagement and Outreach: Utility-Scale Land-Based 80-Meter Wind  

Wind Powering America (EERE)

Maps & Data Maps & Data Printable Version Bookmark and Share Utility-Scale Land-Based Maps Wind Resource Potential Offshore Maps Community-Scale Maps Residential-Scale Maps Anemometer Loan Programs & Data Utility-Scale Land-Based 80-Meter Wind Maps The U.S. Department of Energy provides an 80-meter (m) height, high-resolution wind resource map for the United States with links to state wind maps. States, utilities, and wind energy developers use utility-scale wind resource maps to locate and quantify the wind resource, identifying potentially windy sites within a fairly large region and determining a potential site's economic and technical viability. A wind resource map of the United States. Washington wind map and resources. Oregon wind map and resources. California wind map and resources. Idaho wind map and resources. Nevada wind map and resources. Arizona wind map and resources. Utah wind map and resources. Montana wind map and resources. Wyoming wind map and resources. North Dakota wind map and resources. South Dakota wind map and resources. Nebraska wind map and resources. Colorado wind map and resources. New Mexico wind map and resources. Kansas wind map and resources. Oklahoma wind map and resources. Texas wind map and resources. Minnesota wind map and resources. Iowa wind map and resources. Missouri wind map and resources. Arkansas wind map and resources. Lousiana wind map and resources. Wisconsin wind map and resources. Michigan wind map and resources. Michigan wind map and resources. Illinois wind map and resources. Indiana wind map and resources. Ohio wind map and resources. Kentucky wind map and resources. Tennessee wind map and resources. Mississippi wind map and resources. Alabama wind map and resources. Georgia wind map and resources. Florida wind map and resources. South Carolina wind map and resources. North Carolina wind map and resources. West Virginia wind map and resources. Virginia wind map and resources. Maryland wind map and resources. Pennsylvania wind map and resources. Delaware wind map and resources. New Jersey wind map and resources. New York wind map and resources. Maine wind map and resources. Vermont wind map and resources. New Hampshire wind map and resources. Massachusetts wind map and resources. Rhode Island wind map and resources. Connecticut wind map and resources. Alaska wind map and resources. Hawaii wind map and resources.

47

Large Wind Technology | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Large Wind Technology Large Wind Technology Large Wind Technology The Wind Program works with industry partners to increase the performance and reliability of large wind technologies while lowering the cost of wind energy. The program's research efforts have helped to increase the average capacity factor (a measure of power plant productivity) from 22% for wind turbines installed before 1998 to 35% for turbines installed between 2004 and 2007. Wind energy costs have been reduced from over 55 cents (current dollars) per kilowatt-hour (kWh) in 1980 to under six cents/kWh today. To ensure future industry growth, the technology must continue to evolve, building on earlier successes to further improve reliability, increase capacity factors, and reduce costs. This page describes the goal of the

48

Siting technologies for large wind turbine clusters  

DOE Green Energy (OSTI)

Site selection for large wind turbine clusters requires thorough documentation of the wind characteristics at the site, because of the influence these characteristics will have on the economics, operations, and service life of the wind turbines. The wind prospecting strategy can be used by a utility to determine specific locations for each wind turbine in a cluster of 10 to 50 or more machines. The key to site selection is knowing what and where to measure. Siting techniques to be used at the various stages of the wind-prospecting strategy are discussed. These techniques help determine where to measure. What to measure at a site is still a moot question. Suggestions are made on what data are needed at what sampling rates. These are based on the assumption that until further experience in siting large clusters of wind turbines is in hand, thorough documentation of wind characteristics affecting machine and cluster output characteristics, operation strategies, and service life are necessary.

Hiester, T.R.; Pennell, W.T.

1979-11-01T23:59:59.000Z

49

Continental-Scale Simulation of the Antarctic Katabatic Wind Regime  

Science Conference Proceedings (OSTI)

Katabatic winds are a common feature of the lower Antarctic atmosphere. Although these drainage flows are quite shallow, there is increasing evidence that the low-level circulations are an important component in establishing large-scale ...

Thomas R. Parish; David H. Bromwich

1991-02-01T23:59:59.000Z

50

Multi-Agent Model for Fatigue Control in Large Offshore Wind Farm  

Science Conference Proceedings (OSTI)

To control wind turbine fatigue and optimize the fatigue distribution for offshore wind farm, a control network model is proposed based on Multi-Agent theory. A typical model of large-scale offshore wind farm is described. Power fatigue of individual ... Keywords: Multi-Agent model, fatigue, wind turbine, offshore wind farm

Rongyong Zhao; Yongqing Su; Torben Knudsen; Thomas Bak; WenZhong Shen

2008-12-01T23:59:59.000Z

51

Meteorological aspects of siting large wind turbines  

DOE Green Energy (OSTI)

This report, which focuses on the meteorological aspects of siting large wind turbines (turbines with a rated output exceeding 100 kW), has four main goals. The first is to outline the elements of a siting strategy that will identify the most favorable wind energy sites in a region and that will provide sufficient wind data to make responsible economic evaluations of the site wind resource possible. The second is to critique and summarize siting techniques that were studied in the Department of Energy (DOE) Wind Energy Program. The third goal is to educate utility technical personnel, engineering consultants, and meteorological consultants (who may have not yet undertaken wind energy consulting) on meteorological phenomena relevant to wind turbine siting in order to enhance dialogues between these groups. The fourth goal is to minimize the chances of failure of early siting programs due to insufficient understanding of wind behavior.

Hiester, T.R.; Pennell, W.T.

1981-01-01T23:59:59.000Z

52

Wind shear climatology for large wind turbine generators  

DOE Green Energy (OSTI)

Climatological wind shear analyses relevant to the design and operation of multimegawatt wind turbines are provided. Insight is provided for relating the wind experienced by a rotating blade in a shear flow to the analysis results. A simple analysis of the wind experienced by a rotating blade for three types of wind shear profiles under steady-state conditions is presented in graphical form. Comparisons of the magnitude and frequency of the variations in 1) the wind sensed by a single blade element, 2) the sum, and 3) the difference of the winds sensed by opposite blade elements show strong sensitivity to profile shape. These three items represent forcing functions that can be related to 1) flatwise bending moment, 2) torque on the shaft, and 3) teeter angle. A computer model was constructed to simulate rotational sampling of 10-s sampled winds from a tall tower for three different types of large wind turbines. Time series produced by the model indicated that the forcing functions on a rotating blade vary according to the shear profile encountered during each revolution as opposed to a profile derived from average wind conditions, e.g., hourly average winds. An analysis scheme was developed to establish a climatology of wind shear profiles derived from 10-s sampled winds and hourly average winds measured over a one-year period at several levels on a tall tower. Because of the sensitivity of the forcing function variability to profile shape, the analyses performed and presented are in the form of joint frequency distributions of velocity differences of the the top-to-hub versus the hub-to-bottom portion of disks of rotation for the three turbine configurations.

Elliott, D.L.; Wendell, L.L.; Heflick, S.K.

1982-10-01T23:59:59.000Z

53

Scaling Issues for Large-Scale Grids  

E-Print Network (OSTI)

· ESNet Can Play a Very Important Role in the Science Grid � Security Aspects of Grids · ESNet Can Provide will be important and very useful for managing large-scale virtual org. structures #12;·ESNet Can Play a Very Important Role in the Science Grid · ESNet can provide a rooted and managed namespace, and a place to home

54

Self-organization of large-scale ULF electromagnetic wave structures in their interaction with nonuniform zonal winds in the ionospheric E region  

Science Conference Proceedings (OSTI)

A study is made of the generation and subsequent linear and nonlinear evolution of ultralow-frequency planetary electromagnetic waves in the E region of a dissipative ionosphere in the presence of a nonuniform zonal wind (a sheared flow). Hall currents flowing in the E region and such permanent global factors as the spatial nonuniformity of the geomagnetic field and of the normal component of the Earth's angular velocity give rise to fast and slow planetary-scale electromagnetic waves. The efficiency of the linear amplification of planetary electromagnetic waves in their interaction with a nonuniform zonal wind is analyzed. When there are sheared flows, the operators of linear problems are non-self-conjugate and the corresponding eigenfunctions are nonorthogonal, so the canonical modal approach is poorly suited for studying such motions and it is necessary to utilize the so-called nonmodal mathematical analysis. It is shown that, in the linear evolutionary stage, planetary electromagnetic waves efficiently extract energy from the sheared flow, thereby substantially increasing their amplitude and, accordingly, energy. The criterion for instability of a sheared flow in an ionospheric medium is derived. As the shear instability develops and the perturbation amplitude grows, a nonlinear self-localization mechanism comes into play and the process ends with the self-organization of nonlinear, highly localized, solitary vortex structures. The system thus acquires a new degree of freedom, thereby providing a new way for the perturbation to evolve in a medium with a sheared flow. Depending on the shape of the sheared flow velocity profile, nonlinear structures can be either purely monopole vortices or vortex streets against the background of the zonal wind. The accumulation of such vortices can lead to a strongly turbulent state in an ionospheric medium.

Aburjania, G. D. [Tbilisi State University, I. Vekua Institute of Applied Mathematics (Georgia); Chargazia, Kh. Z. [Nodia Institute of Geophysics (Georgia)

2011-02-15T23:59:59.000Z

55

Nitrogen isotopes in the recent solar wind from the analysis of genesis targets: evidence for large scale isotope heterogeneity in the nascent solar system  

DOE Green Energy (OSTI)

Nitrogen, the fifth most abundant element in the universe, displays the largest stable isotope variations in the solar system reservoirs after hydrogen. Yet the value of isotopic composition of solar nitrogen, presumably the best proxy of the protosolar nebula composition, is not known. Nitrogen isotopes trapped in Genesis spacecraft target material indicate a 40 % depletion of {sup 15}N in solar wind N relative to inner planets and meteorites, and define a composition for the present-day Sun undistinguishable from that of Jupiter's atmosphere. These results indicate that the isotopic composition of of nitrogen in the outer convective zone of the Sun (OCZ) has not changed through time, and is representative of the protosolar nebula. Large {sup 15}N enrichments during e.g., irradiation, or contributions from {sup 15}N-rich presolar components, are required to account for planetary values.

Wiens, Roger C [Los Alamos National Laboratory; Marty, Bernard [INSU-CNRS; Zimmermann, Laurent [INSU-CNRS; Burnard, Peter G [INSU-CNRS; Burnett, Donald L [CALTECH; Heber, Veronika S [ETH ZURICH; Wieler, Rainer [ETH ZURICH; Bochsler, Peter [UNIV OV BERN

2009-01-01T23:59:59.000Z

56

Large scale meteorological influence during the Geysers 1979 field experiment  

DOE Green Energy (OSTI)

A series of meteorological field measurements conducted during July 1979 near Cobb Mountain in Northern California reveals evidence of several scales of atmospheric circulation consistent with the climatic pattern of the area. The scales of influence are reflected in the structure of wind and temperature in vertically stratified layers at a given observation site. Large scale synoptic gradient flow dominates the wind field above about twice the height of the topographic ridge. Below that there is a mixture of effects with evidence of a diurnal sea breeze influence and a sublayer of katabatic winds. The July observations demonstrate that weak migratory circulations in the large scale synoptic meteorological pattern have a significant influence on the day-to-day gradient winds and must be accounted for in planning meteorological programs including tracer experiments.

Barr, S.

1980-01-01T23:59:59.000Z

57

International Workshop on Small Scale Wind Energy for Developing Countries  

Open Energy Info (EERE)

Scale Wind Energy for Developing Countries Scale Wind Energy for Developing Countries Jump to: navigation, search Name International Workshop on Small Scale Wind Energy for Developing Countries Agency/Company /Organization Risoe DTU Sector Energy Focus Area Renewable Energy, Wind Topics Implementation, Technology characterizations Resource Type Workshop, Training materials, Lessons learned/best practices Website http://www.risoe.dtu.dk/~/medi References International Workshop on Small Scale Wind Energy for Developing Countries[1] Background "The workshop covers the following main themes: Wind energy technologies, their perspectives and applications in developing countries. Reliability of wind turbines, lifetime and strength of wind turbine components. Low cost and natural materials for wind turbines.

58

Commercialization analysis of large wind energy conversion systems. Final report  

DOE Green Energy (OSTI)

The framework is described that can be used to evaluate potential new federal incentives to facilitate the market acceptance of utility-scale wind energy conversion systems. The insights gained from utilizing this framework to evaluate a variety of hypothetical federal incentives are discussed. The heart of the evaluation framework is an explicit representation of the decisions made by utility purchasers, suppliers, and government agencies with respect to the utilization and fabrication of large wind energy conversion systems. The demand-side and supply-side aspects of the multiparty commercialization model are described, and the model's struture is explained. (LEW)

Boyd, D.W.; Buckley, O.E.; Haas, S.M.

1980-06-01T23:59:59.000Z

59

Wind Turbine Design Cost and Scaling Model  

NLE Websites -- All DOE Office Websites (Extended Search)

Wind Turbine Design Cost Wind Turbine Design Cost and Scaling Model L. Fingersh, M. Hand, and A. Laxson Technical Report NREL/TP-500-40566 December 2006 NREL is operated by Midwest Research Institute ● Battelle Contract No. DE-AC36-99-GO10337 Wind Turbine Design Cost and Scaling Model L. Fingersh, M. Hand, and A. Laxson Prepared under Task No. WER6.0703 Technical Report NREL/TP-500-40566 December 2006 National Renewable Energy Laboratory 1617 Cole Boulevard, Golden, Colorado 80401-3393 303-275-3000 * www.nrel.gov Operated for the U.S. Department of Energy Office of Energy Efficiency and Renewable Energy by Midwest Research Institute * Battelle Contract No. DE-AC36-99-GO10337 NOTICE This report was prepared as an account of work sponsored by an agency of the United States government.

60

Sensitivity of Low-Level Winds Simulated by the WRF Model in California’s Central Valley to Uncertainties in the Large-Scale Forcing and Soil Initialization  

Science Conference Proceedings (OSTI)

The sensitivity of the Weather and Research Forecasting (WRF) model-simulated low-level winds in the Central Valley (CV) of California to uncertainties in the atmospheric forcing and soil initialization is investigated using scatter diagrams for ...

Sara A. Michelson; Jian-Wen Bao

2008-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "large scale wind" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Large-Eddy Simulation of Wind-Plant Aerodynamics  

DOE Green Energy (OSTI)

In this work, we present results of a large-eddy simulation of the 48 multi-megawatt turbines composing the Lillgrund wind plant. Turbulent inflow wind is created by performing an atmospheric boundary layer precursor simulation, and turbines are modeled using a rotating, variable-speed actuator line representation. The motivation for this work is that few others have done large-eddy simulations of wind plants with a substantial number of turbines, and the methods for carrying out the simulations are varied. We wish to draw upon the strengths of the existing simulations and our growing atmospheric large-eddy simulation capability to create a sound methodology for performing this type of simulation. We used the OpenFOAM CFD toolbox to create our solver. The simulated time-averaged power production of the turbines in the plant agrees well with field observations, except with the sixth turbine and beyond in each wind-aligned. The power produced by each of those turbines is overpredicted by 25-40%. A direct comparison between simulated and field data is difficult because we simulate one wind direction with a speed and turbulence intensity characteristic of Lillgrund, but the field observations were taken over a year of varying conditions. The simulation shows the significant 60-70% decrease in the performance of the turbines behind the front row in this plant that has a spacing of 4.3 rotor diameters in this direction. The overall plant efficiency is well predicted. This work shows the importance of using local grid refinement to simultaneously capture the meter-scale details of the turbine wake and the kilometer-scale turbulent atmospheric structures. Although this work illustrates the power of large-eddy simulation in producing a time-accurate solution, it required about one million processor-hours, showing the significant cost of large-eddy simulation.

Churchfield, M. J.; Lee, S.; Moriarty, P. J.; Martinez, L. A.; Leonardi, S.; Vijayakumar, G.; Brasseur, J. G.

2012-01-01T23:59:59.000Z

62

Wind shear for large wind turbine generators at selected tall tower sites  

DOE Green Energy (OSTI)

The objective of the study described in this report is to examine the nature of wind shear profiles and their variability over the height of large horizontal-axis wind turbines and to provide information on wind shear relevant to the design and opertion of large wind turbines. Wind turbine fatigue life and power quality are related through the forcing functions on the blade to the shapes of the wind shear profiles and their fluctuations over the disk of rotation.

Elliott, D.L.

1984-04-01T23:59:59.000Z

63

Community small scale wind farms for New Zealand: a comparative study of Austrian development, with consideration for New Zealand???s future wind energy development.  

E-Print Network (OSTI)

??In New Zealand, the development of wind energy is occurring predominantly at a large scale level with very little opportunity for local people to become… (more)

Thomson, Grant

64

Commonwealth Wind Community-Scale Initiative | Department of...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Community-Scale Initiative Commonwealth Wind Community-Scale Initiative Eligibility Agricultural Commercial Fed. Government Industrial Institutional Local Government Low-Income...

65

Commercial Scale Wind Incentive Program | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Commercial Scale Wind Incentive Program Commercial Scale Wind Incentive Program Commercial Scale Wind Incentive Program < Back Eligibility Agricultural Commercial Local Government Nonprofit Residential Schools State Government Savings Category Wind Buying & Making Electricity Maximum Rebate Project Development Assistance: $40,000 Program Info State Oregon Program Type State Rebate Program Rebate Amount Varies Provider Energy Trust of Oregon Energy Trust of Oregon's Commercial Scale Wind offering provides resources and cash incentives to help communities, businesses land owners, and government entities install wind turbine systems up to 20 megawatts (MW) in capacity. Projects may consist of a single turbine or a small group of turbines. A variety of ownership models are allowed. Incentive programs

66

Mesoscale and Large-Eddy Simulations for Wind Energy  

Science Conference Proceedings (OSTI)

Operational wind power forecasting, turbine micrositing, and turbine design require high-resolution simulations of atmospheric flow over complex terrain. The use of both Reynolds-Averaged Navier Stokes (RANS) and large-eddy (LES) simulations is explored for wind energy applications using the Weather Research and Forecasting (WRF) model. To adequately resolve terrain and turbulence in the atmospheric boundary layer, grid nesting is used to refine the grid from mesoscale to finer scales. This paper examines the performance of the grid nesting configuration, turbulence closures, and resolution (up to as fine as 100 m horizontal spacing) for simulations of synoptically and locally driven wind ramping events at a West Coast North American wind farm. Interestingly, little improvement is found when using higher resolution simulations or better resolved turbulence closures in comparison to observation data available for this particular site. This is true for week-long simulations as well, where finer resolution runs show only small changes in the distribution of wind speeds or turbulence intensities. It appears that the relatively simple topography of this site is adequately resolved by all model grids (even as coarse as 2.7 km) so that all resolutions are able to model the physics at similar accuracy. The accuracy of the results is shown in this paper to be more dependent on the parameterization of the land-surface characteristics such as soil moisture rather than on grid resolution.

Marjanovic, N

2011-02-22T23:59:59.000Z

67

Energy Basics: Large-Scale Hydropower  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Energy Basics Renewable Energy Printable Version Share this resource Biomass Geothermal Hydrogen Hydropower Large-Scale Hydropower Microhydropower Hydropower Resources...

68

Virtual screening on large scale grids  

Science Conference Proceedings (OSTI)

Large scale grids for in silico drug discovery open opportunities of particular interest to neglected and emerging diseases. In 2005 and 2006, we have been able to deploy large scale virtual docking within the framework of the WISDOM initiative against ... Keywords: Avian influenza, Large scale grids, Malaria, Virtual screening

Nicolas Jacq; Vincent Breton; Hsin-Yen Chen; Li-Yung Ho; Martin Hofmann; Vinod Kasam; Hurng-Chun Lee; Yannick Legré; Simon C. Lin; Astrid Maaí; Emmanuel Medernach; Ivan Merelli; Luciano Milanesi; Giulio Rastelli; Matthieu Reichstadt; Jean Salzemann; Horst Schwichtenberg; Ying-Ta Wu; Marc Zimmermann

2007-05-01T23:59:59.000Z

69

Large-Eddy Simulation of Langmuir Turbulence in Pure Wind Seas  

Science Conference Proceedings (OSTI)

The scaling of turbulent kinetic energy (TKE) and its vertical component (VKE) in the upper ocean boundary layer, forced by realistic wind stress and surface waves including the effects of Langmuir circulations, is investigated using large-eddy ...

Ramsey R. Harcourt; Eric A. D’Asaro

2008-07-01T23:59:59.000Z

70

Cost Study for Large Wind Turbine Blades  

SciTech Connect

The cost study for large wind turbine blades reviewed three blades of 30 meters, 50 meters, and 70 meters in length. Blade extreme wind design loads were estimated in accordance with IEC Class I recommendations. Structural analyses of three blade sizes were performed at representative spanwise stations assuming a stressed shell design approach and E-glass/vinylester laminate. A bill of materials was prepared for each of the three blade sizes using the laminate requirements prepared during the structural analysis effort. The labor requirements were prepared for twelve major manufacturing tasks. TPI Composites developed a conceptual design of the manufacturing facility for each of the three blade sizes, which was used for determining the cost of labor and overhead (capital equipment and facilities). Each of the three potential manufacturing facilities was sized to provide a constant annual rated power production (MW per year) of the blades it produced. The cost of the production tooling and overland transportation was also estimated. The results indicate that as blades get larger, materials become a greater proportion of total cost, while the percentage of labor cost is decreased. Transportation costs decreased as a percentage of total cost. The study also suggests that blade cost reduction efforts should focus on reducing material cost and lowering manufacturing labor, because cost reductions in those areas will have the strongest impact on overall blade cost.

ASHWILL, THOMAS D.

2003-05-01T23:59:59.000Z

71

Innovative Design Approaches for Large Wind Turbine Blades  

SciTech Connect

The primary goal of the WindPACT Blade System Design Study (BSDS) was investigation and evaluation of design and manufacturing issues for wind turbine blades in the one to ten megawatt size range. The initial project task was to assess the fundamental physical and manufacturing issues that govern and constrain large blades and entails three basic elements: (1) a parametric scaling study to assess blade structure using current technology, (2) an economic study of the cost to manufacture, transport, and install large blades, and (3) identification of promising innovative design approaches that show potential for overcoming fundamental physical and manufacturing constraints. This report discusses several innovative design approaches and their potential for blade cost reduction. During this effort we reviewed methods for optimizing the blade cross-section to improve structural and manufacturing characteristics. We also analyzed and compared a number of composite materials and evaluated their relative merits for use in large wind turbine blades in the range from 30 meters to 70 meters. The results have been summarized in dimensional and non-dimensional format to aid in interpretation. These results build upon earlier parametric and blade cost studies, which were used as a guide for the innovative design approaches explored here.

ASHWILL, THOMAS D.

2003-03-01T23:59:59.000Z

72

Modelling and control of large wind turbine.  

E-Print Network (OSTI)

?? In order to make the wind energy an economical alternative for energy production, upscaling of turbine to 10 - 15MW may be necessary to… (more)

zafar, syed hammad

2013-01-01T23:59:59.000Z

73

Development of a Scale Model Wind Turbine for Testing of Offshore Floating Wind Turbine Systems.  

E-Print Network (OSTI)

??This thesis presents the development of a 1/50th scale 5 MW wind turbine intended for wind and wave basin model testing of commercially viable floating… (more)

Martin, Heather Rae

2011-01-01T23:59:59.000Z

74

Estimated Economic Impacts of Utility Scale Wind Power in Iowa  

NLE Websites -- All DOE Office Websites (Extended Search)

Estimated Economic Impacts of Utility Scale Wind Power in Iowa Sandra Halvatzis and David Keyser National Renewable Energy Laboratory Technical Report NRELTP-6A20-53187 November...

75

Centrality scaling in large networks  

E-Print Network (OSTI)

Betweenness centrality lies at the core of both transport and structural vulnerability properties of complex networks, however, it is computationally costly, and its measurement for networks with millions of nodes is near impossible. By introducing a multiscale decomposition of shortest paths, we show that the contributions to betweenness coming from geodesics not longer than L obey a characteristic scaling vs L, which can be used to predict the distribution of the full centralities. The method is also illustrated on a real-world social network of 5.5*10^6 nodes and 2.7*10^7 links.

Ercsey-Ravasz, Maria

2010-01-01T23:59:59.000Z

76

Diagnosing Santa Ana Winds in Southern California with Synoptic-Scale Analysis  

Science Conference Proceedings (OSTI)

Santa Ana winds (SAW) are among the most notorious fire-weather conditions in the United States and are implicated in wildfire and wind hazards in Southern California. This study employs large-scale reanalysis data to diagnose SAW through synoptic-...

John T. Abatzoglou; Renaud Barbero; Nicholas J. Nauslar

2013-06-01T23:59:59.000Z

77

National-Scale Wind Resource Assessment for Power Generation (Presentation)  

SciTech Connect

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.

Baring-Gould, E. I.

2013-08-01T23:59:59.000Z

78

Directional Response of Wind Waves to a Large Wind Shift  

Science Conference Proceedings (OSTI)

The directional response of a fully arisen sea to a 90° wind shift is studied using a combination of airborne radar and in situ directional wave observations. The observations were made in February 1991 as a part of the Surface Wave Dynamics ...

Frederick C. Jackson; Robert E. Jensen

1999-11-01T23:59:59.000Z

79

Expedited Permitting of Grid-Scale Wind Energy Development (Maine) |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Expedited Permitting of Grid-Scale Wind Energy Development (Maine) Expedited Permitting of Grid-Scale Wind Energy Development (Maine) Expedited Permitting of Grid-Scale Wind Energy Development (Maine) < Back Eligibility Utility Fed. Government Commercial Agricultural Investor-Owned Utility State/Provincial Govt Industrial Construction Municipal/Public Utility Local Government Residential Installer/Contractor Rural Electric Cooperative Tribal Government Low-Income Residential Schools Retail Supplier Institutional Multi-Family Residential Systems Integrator Fuel Distributor Nonprofit General Public/Consumer Transportation Savings Category Wind Buying & Making Electricity Program Info State Maine Program Type Siting and Permitting Maine's Expedited Permitting of Grid-Scale Wind Energy Development statue provides an expedited permitting pathway for proposed wind developments in

80

Commonwealth Wind Community-Scale Wind Initiative (Massachusetts...  

Open Energy Info (EERE)

Development Strategies Oil & Gas Smart Grid Solar U.S. OpenLabs Utilities Water Wind Page Actions View form View source History View New Pages Recent Changes All Special...

Note: This page contains sample records for the topic "large scale wind" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Energy Basics: Large-Scale Hydropower  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

These plants are more than 30 MW in size, and there is more than 80,000 MW of installed generation capacity in the United States today. Most large-scale hydropower projects use a...

82

Program Management for Large Scale Engineering Programs  

E-Print Network (OSTI)

The goal of this whitepaper is to summarize the LAI research that applies to program management. The context of most of the research discussed in this whitepaper are large-scale engineering programs, particularly in the ...

Oehmen, Josef

83

Large-Scale Hydrogen Combustion Experiments  

Science Conference Proceedings (OSTI)

Large-scale combustion experiments show that deliberate ignition can limit hydrogen accumulation in reactor containments. The collected data allow accurate evaluation of containment pressures and temperatures associated with hydrogen combustion.

1988-10-18T23:59:59.000Z

84

Large-Scale Dynamics and Global Warming  

Science Conference Proceedings (OSTI)

Predictions of future climate change raise a variety of issues in large-scale atmospheric and oceanic dynamics. Several of these are reviewed in this essay, including the sensitivity of the circulation of the Atlantic Ocean to increasing ...

Isaac M. Held

1993-02-01T23:59:59.000Z

85

Interannual Variability of Tropical Cyclones in the Australian Region: Role of Large-Scale Environment  

Science Conference Proceedings (OSTI)

This study investigates the role of large-scale environmental factors, notably sea surface temperature (SST), low-level relative vorticity, and deep-tropospheric vertical wind shear, in the interannual variability of November–April tropical ...

Hamish A. Ramsay; Lance M. Leslie; Peter J. Lamb; Michael B. Richman; Mark Leplastrier

2008-03-01T23:59:59.000Z

86

SCALE DEPENDENCE OF MAGNETIC HELICITY IN THE SOLAR WIND  

SciTech Connect

We determine the magnetic helicity, along with the magnetic energy, at high latitudes using data from the Ulysses mission. The data set spans the time period from 1993 to 1996. The basic assumption of the analysis is that the solar wind is homogeneous. Because the solar wind speed is high, we follow the approach first pioneered by Matthaeus et al. by which, under the assumption of spatial homogeneity, one can use Fourier transforms of the magnetic field time series to construct one-dimensional spectra of the magnetic energy and magnetic helicity under the assumption that the Taylor frozen-in-flow hypothesis is valid. That is a well-satisfied assumption for the data used in this study. The magnetic helicity derives from the skew-symmetric terms of the three-dimensional magnetic correlation tensor, while the symmetric terms of the tensor are used to determine the magnetic energy spectrum. Our results show a sign change of magnetic helicity at wavenumber k {approx} 2 AU{sup -1} (or frequency {nu} {approx} 2 {mu}Hz) at distances below 2.8 AU and at k {approx} 30 AU{sup -1} (or {nu} {approx} 25 {mu}Hz) at larger distances. At small scales the magnetic helicity is positive at northern heliographic latitudes and negative at southern latitudes. The positive magnetic helicity at small scales is argued to be the result of turbulent diffusion reversing the sign relative to what is seen at small scales at the solar surface. Furthermore, the magnetic helicity declines toward solar minimum in 1996. The magnetic helicity flux integrated separately over one hemisphere amounts to about 10{sup 45} Mx{sup 2} cycle{sup -1} at large scales and to a three times lower value at smaller scales.

Brandenburg, Axel [NORDITA, AlbaNova University Center, Roslagstullsbacken 23, SE-10691 Stockholm (Sweden); Subramanian, Kandaswamy [Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune 411 007 (India); Balogh, Andre [International Space Science Institute, Hallerstrasse 6, Bern CH-3012 (Switzerland); Goldstein, Melvyn L., E-mail: brandenb@nordita.org, E-mail: kandu@iucaa.ernet.in, E-mail: a.balogh@imperial.ac.uk, E-mail: melvyn.l.goldstein@nasa.gov [Code 673, NASA-Goddard Space Flight Center, Greenbelt, MD 20771 (United States)

2011-06-10T23:59:59.000Z

87

Winding numbers and scaling tilts from random vortex-antivortex pairs  

E-Print Network (OSTI)

I show that random distributions of vortex-antivortex pairs (rather than of individual vortices) lead to scaling of typical winding numbers W trapped inside a loop of circumference C with the square root of C when the expected winding numbers are large. Such scaling is consistent with the Kibble-Zurek mechanism (KZM). By contrast, distribution of individual vortices with randomly assigned topological charges would result in the dispersion of W scaling with the square root of the area inside C. Scaling of the dispersion of W and of the probability of detection of non-zero W with C can be also studied for loops so small that non-zero windings are rare. In this case I show a doubling of the scaling of dispersion with C when compared to the scaling of dispersion in the large W regime. Moreover, probability of trapping of a non-zero W becomes, in this case, proportional to the area subtended by C (hence, to the square of circumference). This quadruples, as compared with large winding numbers regime, the exponent in the power law dependence of the frequency of trapping of W=+1 or W=-1 on C. Such change of the power law exponent by a FACTOR OF FOUR implies quadrupling of the scaling of the frequency of winding number trapping with the quench rate, and is of key importance for experimental tests of KZM.

Wojciech H. Zurek

2013-05-21T23:59:59.000Z

88

Limits to the power density of very large wind farms  

E-Print Network (OSTI)

A simple analysis is presented concerning an upper limit of the power density (power per unit land area) of a very large wind farm located at the bottom of a fully developed boundary layer. The analysis suggests that the limit of the power density is about 0.38 times $\\tau_{w0}U_{F0}$, where $\\tau_{w0}$ is the natural shear stress on the ground (that is observed before constructing the wind farm) and $U_{F0}$ is the natural or undisturbed wind speed averaged across the height of the farm to be constructed. Importantly, this implies that the maximum extractable power from such a very large wind farm will not be proportional to the cubic of the wind speed at the farm height, or even the farm height itself, but be proportional to $U_{F0}$.

Nishino, Takafumi

2013-01-01T23:59:59.000Z

89

REGIONAL-SCALE WIND FIELD CLASSIFICATION EMPLOYING CLUSTER ANALYSIS  

DOE Green Energy (OSTI)

The classification of time-varying multivariate regional-scale wind fields at a specific location can assist event planning as well as consequence and risk analysis. Further, wind field classification involves data transformation and inference techniques that effectively characterize stochastic wind field variation. Such a classification scheme is potentially useful for addressing overall atmospheric transport uncertainty and meteorological parameter sensitivity issues. Different methods to classify wind fields over a location include the principal component analysis of wind data (e.g., Hardy and Walton, 1978) and the use of cluster analysis for wind data (e.g., Green et al., 1992; Kaufmann and Weber, 1996). The goal of this study is to use a clustering method to classify the winds of a gridded data set, i.e, from meteorological simulations generated by a forecast model.

Glascoe, L G; Glaser, R E; Chin, H S; Loosmore, G A

2004-06-17T23:59:59.000Z

90

Commonwealth Wind Community-Scale Initiative | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Commonwealth Wind Community-Scale Initiative Commonwealth Wind Community-Scale Initiative Commonwealth Wind Community-Scale Initiative < Back Eligibility Agricultural Commercial Fed. Government Industrial Institutional Local Government Low-Income Residential Multi-Family Residential Nonprofit Schools State Government Tribal Government Savings Category Wind Buying & Making Electricity Maximum Rebate Public Entities: $100,000 Non-Public Entities: $67,000 Program Info Funding Source Massachusetts Clean Energy Center (MassCEC) Expiration Date 08/01/2013 State Massachusetts Program Type State Grant Program Rebate Amount Varies depending on applicant type (public vs. non-public) and grant type (site assessment, feasibility study, onsite wind monitoring, acoustic studies, and business planning) Provider Massachusetts Clean Energy Center

91

FULL-SCALE, WIND TUNNEL AND CFD WIND ENGINEERING STUDIES A variety of methods can be used to obtain wind engineering design information. These include  

E-Print Network (OSTI)

FULL-SCALE, WIND TUNNEL AND CFD WIND ENGINEERING STUDIES A variety of methods can be used to obtain wind engineering design information. These include codes of practice, full-scale, wind tunnel are listed in the table below: Table 1. Relative advantages and disadvantages of wind engineering techniques

Savory, Eric

92

Did the Beaufort Scale or the Wind Climate Change?  

Science Conference Proceedings (OSTI)

Possible long-term variations of the Beaufort scale of wind speeds are investigated from frequency distributions of about 300 000 ship observations. Records from the western entrance to the English Channel are taken as representative for ...

E. W. Peterson; L. Hasse

1987-07-01T23:59:59.000Z

93

Initial Economic Analysis of Utility-scale Wind Integration in...  

NLE Websites -- All DOE Office Websites (Extended Search)

by the Alliance for Sustainable Energy, LLC. INITIAL ECONOMIC ANALYSIS OF UTILITY-SCALE WIND INTEGRATION IN HAWAII NOTICE This report was prepared as an account of work sponsored...

94

The Frictional Nearshore Response to Forcing by Synoptic Scale Winds  

Science Conference Proceedings (OSTI)

An analytic barotropic model was used to study the nearshore frictional response to synoptic-scale wind forcing. The results depend only on the region where the surface and bottom Ekman layers interact strongly and the water is consequently well ...

Gary T. Mitchum; Allan J. Clarke

1986-05-01T23:59:59.000Z

95

Fluidic: Grid-Scale Batteries for Wind and Solar | Department...  

NLE Websites -- All DOE Office Websites (Extended Search)

up to 5,000 charge and discharge cycles - enough to support grid-scale integration of wind and solar power. Fluidic's battery could also help optimize electric grid performance...

96

Stakeholder Engagement and Outreach: Residential-Scale 30-Meter Wind Maps  

Wind Powering America (EERE)

Residential-Scale 30-Meter Wind Maps Residential-Scale 30-Meter Wind Maps The Stakeholder Engagement and Outreach initiative provides 30-meter (m) height, high-resolution wind resource maps for the United States. Businesses, farms, and homeowners use residential-scale wind resource maps to identify wind sites that may be appropriate for small-scale wind projects. A wind resource map of the United States. Go to the California wind resource map. Go to the Washington wind resource map. Go to the Oregon wind resource map. Go to the Idaho wind resource map. Go to the Nevada wind resource map. Go to the Montana wind resource map. Go to the Wyoming wind resource map. Go to the Utah wind resource map. Go to the Colorado wind resource map. Go to the Arizona wind resource map. Go to the New Mexico wind resource map. Go to the North Dakota wind resource map. Go to the South Dakota wind resource map. Go to the Nebraska wind resource map. Go to the Kansas wind resource map. Go to the Oklahoma wind resource map. Go to the Texas wind resource map. Go to the Minnesota wind resource map. Go to the Iowa wind resource map. Go to the Missouri wind resource map. Go to the Arkansas wind resource map. Go to the Louisiana wind resource map. Go to the Wisconsin wind resource map. Go to the Illinois wind resource map. Go to the Indiana wind resource map. Go to the Michigan wind resource map. Go to the Ohio wind resource map. Go to the Kentucky wind resource map. Go to the Tennessee wind resource map. Go to the Mississippi wind resource map. Go to the Alabama wind resource map. Go to the Florida wind resource map. Go to the Georgia wind resource map. Go to the South Carolina wind resource map. Go to the North Carolina wind resource map. Go to the Virginia wind resource map. Go to the West Virginia wind resource map. Go to the Pennsylvania wind resource map. Go to the Maryland wind resource map. Go to the Delaware wind resource map. Go to the New Jersey wind resource map. Go to the New York wind resource map. Go to the Connecticut wind resource map. Go to the Rhode Island wind resource map. Go to the Massachusetts wind resource map. Go to the Vermont wind resource map. Go to the New Hampshire wind resource map. Go to the Maine wind resource map. Go to the Alaska wind resource map. Go to the Hawaii wind resource map.

97

Laramie County Community College: Utility-Scale Wind Energy Technology  

DOE Green Energy (OSTI)

The Utility-Scale Wind Energy Technology U.S. Department of Energy (DOE) grant EE0000538, provided a way ahead for Laramie County Community College (LCCC) to increase educational and training opportunities for students seeking an Associate of Applied Science (AAS) or Associate of Science (AS) degree in Wind Energy Technology. The DOE grant enabled LCCC to program, schedule, and successfully operate multiple wind energy technology cohorts of up to 20-14 students per cohort simultaneously. As of this report, LCCC currently runs four cohorts. In addition, the DOE grant allowed LCCC to procure specialized LABVOLT electronic equipment that directly supports is wind energy technology curriculum.

Douglas P. Cook

2012-05-22T23:59:59.000Z

98

Distributed large-scale natural graph factorization  

Science Conference Proceedings (OSTI)

Natural graphs, such as social networks, email graphs, or instant messaging patterns, have become pervasive through the internet. These graphs are massive, often containing hundreds of millions of nodes and billions of edges. While some theoretical models ... Keywords: asynchronous algorithms, distributed optimization, graph algorithms, graph factorization, large-scale machine learning, matrix factorization

Amr Ahmed, Nino Shervashidze, Shravan Narayanamurthy, Vanja Josifovski, Alexander J. Smola

2013-05-01T23:59:59.000Z

99

Documenting Wind Speed and Power Deficits behind a Utility-Scale Wind Turbine  

Science Conference Proceedings (OSTI)

High-spatial-and-temporal-resolution radial velocity measurements surrounding a single utility-scale wind turbine were collected using the Texas Tech University Ka-band mobile research radars. The measurements were synthesized to construct the ...

Brian D. Hirth; John L. Schroeder

2013-01-01T23:59:59.000Z

100

Large-Scale PV Integration Study  

DOE Green Energy (OSTI)

This research effort evaluates the impact of large-scale photovoltaic (PV) and distributed generation (DG) output on NV Energy’s electric grid system in southern Nevada. It analyzes the ability of NV Energy’s generation to accommodate increasing amounts of utility-scale PV and DG, and the resulting cost of integrating variable renewable resources. The study was jointly funded by the United States Department of Energy and NV Energy, and conducted by a project team comprised of industry experts and research scientists from Navigant Consulting Inc., Sandia National Laboratories, Pacific Northwest National Laboratory and NV Energy.

Lu, Shuai; Etingov, Pavel V.; Diao, Ruisheng; Ma, Jian; Samaan, Nader A.; Makarov, Yuri V.; Guo, Xinxin; Hafen, Ryan P.; Jin, Chunlian; Kirkham, Harold; Shlatz, Eugene; Frantzis, Lisa; McClive, Timothy; Karlson, Gregory; Acharya, Dhruv; Ellis, Abraham; Stein, Joshua; Hansen, Clifford; Chadliev, Vladimir; Smart, Michael; Salgo, Richard; Sorensen, Rahn; Allen, Barbara; Idelchik, Boris

2011-07-29T23:59:59.000Z

Note: This page contains sample records for the topic "large scale wind" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Large-Eddy Simulation of Wind-Plant Aerodynamics: Preprint  

DOE Green Energy (OSTI)

In this work, we present results of a large-eddy simulation of the 48 multi-megawatt turbines composing the Lillgrund wind plant. Turbulent inflow wind is created by performing an atmospheric boundary layer precursor simulation and turbines are modeled using a rotating, variable-speed actuator line representation. The motivation for this work is that few others have done wind plant large-eddy simulations with a substantial number of turbines, and the methods for carrying out the simulations are varied. We wish to draw upon the strengths of the existing simulations and our growing atmospheric large-eddy simulation capability to create a sound methodology for performing this type of simulation. We have used the OpenFOAM CFD toolbox to create our solver.

Churchfield, M. J.; Lee, S.; Moriarty, P. J.; Martinez, L. A.; Leonardi, S.; Vijayakumar, G.; Brasseur, J. G.

2012-01-01T23:59:59.000Z

102

Large-Scale Renewable Energy Guide  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Renewable Energy Guide Renewable Energy Guide Brad Gustafson, FEMP 2 Large-scale RE Guide Large-scale RE Guide: Developing Renewable Energy Projects Larger than 10 MWs at Federal Facilities Introduction and Overview Federal Utility Partnership Working Group May 22, 2013 Federal Energy Management Program Office of Energy Efficiency and Renewable Energy U.S. Department of Energy 3 Federal Energy Management Program FEMP works with key individuals to accomplish energy change within organizations by bringing expertise from all levels of project and policy implementation to enable Federal Agencies to meet energy related goals and to provide energy leadership to the country. 4 FEMP Renewable Energy * Works to increase the proportion of renewable energy in the Federal government's energy mix.

103

IntroductionIntroduction The use of small scale vertical axis wind turbinesThe use of small scale vertical axis wind turbines  

E-Print Network (OSTI)

IntroductionIntroduction The use of small scale vertical axis wind turbinesThe use of small scale vertical axis wind turbines (VAWT) is being studied at McMaster University using(VAWT) is being studied

Tullis, Stephen

104

Strategies to Finance Large-Scale Deployment of Renewable Energy...  

Open Energy Info (EERE)

Large-Scale Deployment of Renewable Energy Projects: An Economic Development and Infrastructure Approach Jump to: navigation, search Name Strategies to Finance Large-Scale...

105

Large Scale Computing and Storage Requirements for Advanced Scientific...  

NLE Websites -- All DOE Office Websites (Extended Search)

Large Scale Computing and Storage Requirements for Advanced Scientific Computing Research: Target 2014 ASCRFrontcover.png Large Scale Computing and Storage Requirements for...

106

MTC Envelope: Defining the Capability of Large Scale Computers...  

NLE Websites -- All DOE Office Websites (Extended Search)

MTC Envelope: Defining the Capability of Large Scale Computers in the Context of Parallel Scripting Applications Title MTC Envelope: Defining the Capability of Large Scale...

107

(Small scale wind energy conversion programmatic equipment. Final report)  

SciTech Connect

The purpose of this project is to provide South Dakota citizens with a case study of the institutional and technical problems encountered in the installation, maintenance and use of a small wind energy system. The project will provide information on wind turbine reliability, maintenance requirements and power production to demonstrate the feasibility of small-scale wind energy conversion projects for South Dakota. The system was installed by vocational students and instructors at Mitchell Vocational School. It has been in operation since the fall of 1983.

Wegman, S.

1985-05-20T23:59:59.000Z

108

Feasibility Study for a Hopi Utility-Scale Wind Project  

DOE Green Energy (OSTI)

The goal of this project was to investigate the feasibility for the generation of energy from wind and to parallel this work with the development of a tribal utility organization capable of undertaking potential joint ventures in utility businesses and projects on the Hopi reservation. The goal of this project was to investigate the feasibility for the generation of energy from wind and to parallel this work with the development of a tribal utility organization capable of undertaking potential joint ventures in utility businesses and projects on the Hopi reservation. Wind resource assessments were conducted at two study sites on Hopi fee simple lands located south of the city of Winslow. Reports from the study were recently completed and have not been compared to any existing historical wind data nor have they been processed under any wind assessment models to determine the output performance and the project economics of turbines at the wind study sites. Ongoing analysis of the wind data and project modeling will determine the feasibility of a tribal utility-scale wind energy generation.

Kendrick Lomayestewa

2011-05-31T23:59:59.000Z

109

Wind Power Ltd | Open Energy Information  

Open Energy Info (EERE)

Power Ltd Place Wickam Market, United Kingdom Sector Wind energy Product Conducting research into alternative, large scale wind turbine design. References Wind Power Ltd1...

110

Innovative design approaches for large wind turbine blades : final report.  

SciTech Connect

The goal of the Blade System Design Study (BSDS) was investigation and evaluation of design and manufacturing issues for wind turbine blades in the one to ten megawatt size range. A series of analysis tasks were completed in support of the design effort. We began with a parametric scaling study to assess blade structure using current technology. This was followed by an economic study of the cost to manufacture, transport and install large blades. Subsequently we identified several innovative design approaches that showed potential for overcoming fundamental physical and manufacturing constraints. The final stage of the project was used to develop several preliminary 50m blade designs. The key design impacts identified in this study are: (1) blade cross-sections, (2) alternative materials, (3) IEC design class, and (4) root attachment. The results show that thick blade cross-sections can provide a large reduction in blade weight, while maintaining high aerodynamic performance. Increasing blade thickness for inboard sections is a key method for improving structural efficiency and reducing blade weight. Carbon/glass hybrid blades were found to provide good improvements in blade weight, stiffness, and deflection when used in the main structural elements of the blade. The addition of carbon resulted in modest cost increases and provided significant benefits, particularly with respect to deflection. The change in design loads between IEC classes is quite significant. Optimized blades should be designed for each IEC design class. A significant portion of blade weight is related to the root buildup and metal hardware for typical root attachment designs. The results show that increasing the number of blade fasteners has a positive effect on total weight, because it reduces the required root laminate thickness.

2004-05-01T23:59:59.000Z

111

The large scale clustering of radio sources  

E-Print Network (OSTI)

The observed two-point angular correlation function, w(theta), of mJy radio sources exhibits the puzzling feature of a power-law behaviour up to very large (almost 10 degrees) angular scales which cannot be accounted for in the standard hierarchical clustering scenario for any realistic redshift distribution of such sources. After having discarded the possibility that the signal can be explained by a high density local source population, we find no alternatives to assuming that - at variance with all the other extragalactic populations studied so far, and in particular with optically selected quasars - radio sources responsible for the large-scale clustering signal were increasingly less clustered with increasing look-back time, up to at least z=1. The data are accurately accounted for in terms of a bias function which decreases with increasing redshift, mirroring the evolution with cosmic time of the characteristic halo mass, M_{star}, entering the non linear regime. In the framework of the `concordance cosmology', the effective halo mass controlling the bias parameter is found to decrease from about 10^{15} M_{sun}/h at z=0 to the value appropriate for optically selected quasars, 10^{13} M_{sun}/h, at z=1.5. This suggests that, in the redshift range probed by the data, the clustering evolution of radio sources is ruled by the growth of large-scale structure, and that they are associated with the densest environments virializing at any cosmic epoch. The data provide only loose constraints on radio source clustering at z>1 so we cannot rule out the possibility that at these redshifts the clustering evolution of radio sources enters a different regime, perhaps similar to that found for optically selected quasars. The dependence of w(theta) on cosmological parameters is also discussed.

M. Negrello; M. Magliocchetti; G. De Zotti

2006-02-13T23:59:59.000Z

112

Estimation of turbulence level and scale for wind turbine applications  

DOE Green Energy (OSTI)

A simplified method is presented for estimating onsite turbulence variance within the wind turbine layer for horizontal wind speed. The method is based principally on estimating the probability distribution of wind speed and assigning a variance to each mean wind speed based on surface roughness estimates. The model is not proposed as an alternative to onsite measurement and analysis, but rather as an adjunct to such a program. A revision of the Kaimal neutral u-component spectrum is suggested to apply to the mix of the stabilities occurring during operational winds. Values of integral length scale calculated from data analysis are shown to contradict the length scale model implicit in turbulence power spectra. Also, these calculated values are shown to be extremely sensitive to the length of the time series and the detrending method used. The analysis and modeling are extended to the rotational frame of reference for a horizontal-axis wind turbine by modeling the ratios of harmonic spike variances (1P, 2P, etc.) in the rotational spectrum to the Eulerian turbulence variance. 15 refs., 11 figs., 3 tabs.

Powell, D.C.

1988-11-01T23:59:59.000Z

113

Making the Economic Case for Small-Scale Distributed Wind -- A Screening for Distributed Generation Wind Opportunities: Preprint  

DOE Green Energy (OSTI)

This study was an offshoot of a previous assessment, which examined the potential for large-scale, greater than 50 MW, wind development on occupied federal agency lands. The study did not find significant commercial wind development opportunities, primarily because of poor wind resource on available and appropriately sized land areas or land use or aesthetic concerns. The few sites that could accommodate a large wind farm failed to have transmission lines in optimum locations required to generate power at competitive wholesale prices. The study did identify a promising but less common distributed generation (DG) development option. This follow-up study documents the NREL/Global Energy Concepts team efforts to identify economic DG wind projects at a select group of occupied federal sites. It employs a screening strategy based on project economics that go beyond quantity of windy land to include state and utility incentives as well as the value of avoided power purchases. It attempts to account for the extra costs and difficulties associated with small projects through the use of project scenarios that are more compatible with federal facilities and existing land uses. These benefits and barriers of DG are discussed, and the screening methodology and results are included. The report concludes with generalizations about the screening method and recommendations for improvement and other potential applications for this methodology.

Kandt, A.; Brown, E.; Dominick, J.; Jurotich, T.

2007-06-01T23:59:59.000Z

114

Stakeholder Engagement and Outreach: Community-Scale 50-Meter Wind Maps  

Wind Powering America (EERE)

Community-Scale 50-Meter Wind Maps Community-Scale 50-Meter Wind Maps The Stakeholder Engagement and Outreach initiative provides 50-meter (m) height, high-resolution wind resource maps for most of the states and territories of Puerto Rico and the Virgin Islands in the United States. Counties, towns, utilities, and schools use community-scale wind resource maps to locate and quantify the wind resource, identifying potentially windy sites determining a potential site's economic and technical viability. Map of the updated wind resource assessment status for the United States. Go to the Washington wind resource map. Go to the Oregon wind resource map. Go to the California wind resource map. Go to the Nevada wind resource map. Go to the Idaho wind resource map. Go to the Utah wind resource map. Go to the Arizona wind resource map. Go to the Montana wind resource map. Go to the Wyoming wind resource map. Go to the Colorado wind resource map. Go to the New Mexico wind resource map. Go to the North Dakota wind resource map. Go to the South Dakota wind resource map. Go to the Nebraska wind resource map. Go to the Kansas wind resource map. Go to the Oklahoma wind resource map. Go to the Missouri wind resource map. Go to the Alaska wind resource map. Go to the Hawaii wind resource map. Go to the Michigan wind resource map. Go to the Illinois wind resource map. Go to the Indiana wind resource map. Go to the Ohio wind resource map. Go to the North Carolina wind resource map. Go to the Virginia wind resource map. Go to the Maryland wind resource map. Go to the West Virginia wind resource map. Go to the Pennsylvania wind resource map. Go to the Rhode Island wind resource map. Go to the Connecticut wind resource map. Go to the Massachusetts wind resource map. Go to the Vermont wind resource map. Go to the New Hampshire wind resource map. Go to the Maine wind resource map. Go to the Kentucky wind resource map. Go to the Tennessee wind resource map. Go to the Arkansas wind resource map. Go to the Puerto Rico wind resource map. Go to the U.S. Virgin Islands wind resource map. Go to the New Jersey wind resource map. Go to the Delaware wind resource map.

115

Analysis of Wind Power and Load Data at Multiple Time Scales  

NLE Websites -- All DOE Office Websites (Extended Search)

Analysis of Wind Power and Load Data at Multiple Time Scales Analysis of Wind Power and Load Data at Multiple Time Scales Title Analysis of Wind Power and Load Data at Multiple Time Scales Publication Type Report LBNL Report Number LBNL-4147E Year of Publication 2010 Authors Coughlin, Katie, and Joseph H. Eto Date Published 12/2010 Publisher LBNL City Berkeley Keywords renewable generation integration Abstract In this study we develop and apply new methods of data analysis for high resolution wind power and system load time series, to improve our understanding of how to characterize highly variable wind power output and the correlations between wind power and load. These methods are applied to wind and load data from the ERCOT region, and wind power output from the PJM and NYISO areas. We use a wavelet transform to apply mathematically well-defined operations of smoothing and differencing to the time series data. This approach produces a set of time series of the changes in wind power and load (or "deltas"), over a range of times scales from a few seconds to approximately one hour. A number of statistical measures of these time series are calculated. We present sample distributions, and devise a method for fitting the empirical distribution shape in the tails. We also evaluate the degree of serial correlation, and linear correlation between wind and load. Our examination of the data shows clearly that the deltas do not follow a Gaussian shape; the distribution is exponential near the center and appears to follow a power law for larger fluctuations. Gaussian distributions are frequently used in modeling studies. These are likely to over-estimate the probability of small to moderate deviations. This in turn may lead to an over-estimation of the additional reserve requirement (hence the cost) for high penetration of wind. The Gaussian assumption provides no meaningful information about the real likelihood of large fluctuations. The possibility of a power law distribution is interesting because it suggests that the distribution shape for of wind power fluctuations may become independent of system size for large enough systems.

116

Quiet airfoils for small and large wind turbines  

DOE Patents (OSTI)

Thick airfoil families with desirable aerodynamic performance with minimal airfoil induced noise. The airfoil families are suitable for a variety of wind turbine designs and are particularly well-suited for use with horizontal axis wind turbines (HAWTs) with constant or variable speed using pitch and/or stall control. In exemplary embodiments, a first family of three thick airfoils is provided for use with small wind turbines and second family of three thick airfoils is provided for use with very large machines, e.g., an airfoil defined for each of three blade radial stations or blade portions defined along the length of a blade. Each of the families is designed to provide a high maximum lift coefficient or high lift, to exhibit docile stalls, to be relatively insensitive to roughness, and to achieve a low profile drag.

Tangler, James L. (Boulder, CO); Somers, Dan L. (Port Matilda, PA)

2012-06-12T23:59:59.000Z

117

Scaling Laws of Turbulence and Heating of Fast SolarWind: The Role of Density Fluctuations  

E-Print Network (OSTI)

Incompressible and isotropic magnetohydrodynamic turbulence in plasms can be described by an exact relation for the energy flux through the scales. This Yaglom-like scaling law has been recently observed in the solar wind above the solar poles observed by the Ulysses spacecraft, where the turbulence is in an Alfv\\'enic state. An analogous phenomenological scaling law, suitably modified to take into account compressible fluctuations, is observed more frequently in the same dataset. Large scale density fluctuations, despite their low amplitude, play thus a crucial role in the basic scaling properties of turbulence. The turbulent cascade rate in the compressive case can moreover supply the energy dissipation needed to account for the local heating of the non-adiabatic solar wind.

Carbone, V; Sorriso-Valvo, L; Noullez, A; Bruno, R

2010-01-01T23:59:59.000Z

118

Investment Timing and Capacity Choice for Small-Scale Wind Power Under Uncertainty  

E-Print Network (OSTI)

REFERENCES [1] American Wind Power Association (AWEA), Road-CHOICE FOR SMALL-SCALE WIND POWER UNDER UNCERTAINTY Stein-Power production from wind power has stochastic inflows, and

Fleten, Stein-Erik; Maribu, Karl Magnus

2004-01-01T23:59:59.000Z

119

File:Beaufort wind scale.pdf | Open Energy Information  

Open Energy Info (EERE)

source source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search File Edit History Facebook icon Twitter icon » File:Beaufort wind scale.pdf Jump to: navigation, search File File history File usage Metadata File:Beaufort wind scale.pdf Size of this preview: 463 × 599 pixels. Other resolution: 464 × 600 pixels. Full resolution ‎(1,275 × 1,650 pixels, file size: 28 KB, MIME type: application/pdf) [Category:Wind for Schools Portal Curricula]] File history Click on a date/time to view the file as it appeared at that time. Date/Time Thumbnail Dimensions User Comment current 16:44, 2 January 2014 Thumbnail for version as of 16:44, 2 January 2014 1,275 × 1,650 (28 KB) Foteri (Talk | contribs) [Category:Wind for Schools Portal Curricula]][[Category:Wind for Schools Elementary School Curricula]

120

COLLISIONLESS DAMPING AT ELECTRON SCALES IN SOLAR WIND TURBULENCE  

SciTech Connect

The dissipation of turbulence in the weakly collisional solar wind plasma is governed by unknown kinetic mechanisms. Two candidates have been suggested to play an important role in the dissipation, collisionless damping via wave-particle interactions and dissipation in small-scale current sheets. High resolution spacecraft measurements of the turbulent magnetic energy spectrum provide important constraints on the dissipation mechanism. The limitations of popular fluid and hybrid numerical schemes for simulation of the dissipation of solar wind turbulence are discussed, and instead a three-dimensional kinetic approach is recommended. We present a three-dimensional nonlinear gyrokinetic simulation of solar wind turbulence at electron scales that quantitatively reproduces the exponential form of the turbulent magnetic energy spectrum measured in the solar wind. A weakened cascade model that accounts for nonlocal interactions and collisionless Landau damping also quantitatively agrees with the observed exponential form. These results establish that a turbulent cascade of kinetic Alfven waves that is terminated by collisionless Landau damping is sufficient to explain the observed magnetic energy spectrum in the dissipation range of solar wind turbulence.

TenBarge, J. M.; Howes, G. G. [Department of Physics and Astronomy, University of Iowa, Iowa City, IA 52242 (United States); Dorland, W., E-mail: jason-tenbarge@uiowa.edu [Department of Physics, University of Maryland, College Park, MA 20742-3511 (United States)

2013-09-10T23:59:59.000Z

Note: This page contains sample records for the topic "large scale wind" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

A Tree Swaying in a Turbulent Wind: A Scaling Analysis  

E-Print Network (OSTI)

A tentative scaling theory is presented of a tree swaying in a turbulent wind. It is argued that the turbulence of the air within the crown is in the inertial regime, An eddy causes a dynamic bending response of the branches according to a time criterion. The resulting expression for the penetration depth of the wind yields an exponent which is in agreement with that pertaining to the morphology of the tree branches. An energy criterion shows that the dynamics of the branches is basically passive. The possibility of hydrodynamic screening by the leaves is discussed.

Theo Odijk

2013-05-29T23:59:59.000Z

122

Time Scales of the Trade Wind Boundary Layer Adjustment  

Science Conference Proceedings (OSTI)

The adjustment of the trade wind atmospheric boundary layer to an abrupt sea surface warming is investigated using a large-eddy simulation (LES) and two simple bulk models: a mixed-layer model (MLM), and a model based on the mixing-line hypothesis ...

Gilles Bellon; Bjorn Stevens

2013-04-01T23:59:59.000Z

123

FAST Code Verification of Scaling Laws for DeepCwind Floating Wind System Tests: Preprint  

SciTech Connect

This paper investigates scaling laws that were adopted for the DeepCwind project for testing three different floating wind systems at 1/50 scale in a wave tank under combined wind and wave loading.

Jain, A.; Robertson, A. N.; Jonkman, J. M.; Goupee, A. J.; Kimball, R. W.; Swift, A. H. P.

2012-04-01T23:59:59.000Z

124

Analysis of Wind Power and Load Data at Multiple Time Scales  

NLE Websites -- All DOE Office Websites (Extended Search)

Analysis of Wind Power and Load Data at Multiple Time Scales Title Analysis of Wind Power and Load Data at Multiple Time Scales Publication Type Report Year of Publication 2010...

125

Analysis of Wind Power and Load Data at Multiple Time Scales  

SciTech Connect

In this study we develop and apply new methods of data analysis for high resolution wind power and system load time series, to improve our understanding of how to characterize highly variable wind power output and the correlations between wind power and load. These methods are applied to wind and load data from the ERCOT region, and wind power output from the PJM and NYISO areas. We use a wavelet transform to apply mathematically well-defined operations of smoothing and differencing to the time series data. This approach produces a set of time series of the changes in wind power and load (or ?deltas?), over a range of times scales from a few seconds to approximately one hour. A number of statistical measures of these time series are calculated. We present sample distributions, and devise a method for fitting the empirical distribution shape in the tails. We also evaluate the degree of serial correlation, and linear correlation between wind and load. Our examination of the data shows clearly that the deltas do not follow a Gaussian shape; the distribution is exponential near the center and appears to follow a power law for larger fluctuations. Gaussian distributions are frequently used in modeling studies. These are likely to over-estimate the probability of small to moderate deviations. This in turn may lead to an over-estimation of the additional reserve requirement (hence the cost) for high penetration of wind. The Gaussian assumption provides no meaningful information about the real likelihood of large fluctuations. The possibility of a power law distribution is interesting because it suggests that the distribution shape for of wind power fluctuations may become independent of system size for large enough systems.

Coughlin, Katie; Eto, J.H.

2010-12-20T23:59:59.000Z

126

Large Scale Quantum-mechanical Calculations of Proteins, Nanomaterials...  

NLE Websites -- All DOE Office Websites (Extended Search)

Large Scale Quantum-mechanical Calculations of Proteins, Nanomaterials and Other Large Systems Event Sponsor: Leadership Computing Facility Seminar Start Date: Dec 5 2013 - 2:00pm...

127

Federal Energy Management Program: Large-scale Renewable Energy Projects  

NLE Websites -- All DOE Office Websites (Extended Search)

Large-scale Large-scale Renewable Energy Projects (Larger than 10 MWs) to someone by E-mail Share Federal Energy Management Program: Large-scale Renewable Energy Projects (Larger than 10 MWs) on Facebook Tweet about Federal Energy Management Program: Large-scale Renewable Energy Projects (Larger than 10 MWs) on Twitter Bookmark Federal Energy Management Program: Large-scale Renewable Energy Projects (Larger than 10 MWs) on Google Bookmark Federal Energy Management Program: Large-scale Renewable Energy Projects (Larger than 10 MWs) on Delicious Rank Federal Energy Management Program: Large-scale Renewable Energy Projects (Larger than 10 MWs) on Digg Find More places to share Federal Energy Management Program: Large-scale Renewable Energy Projects (Larger than 10 MWs) on

128

Energy Department Loan Guarantee Would Support Large-Scale Rooftop...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Loan Guarantee Would Support Large-Scale Rooftop Solar Power for U.S. Military Housing Energy Department Loan Guarantee Would Support Large-Scale Rooftop Solar Power for U.S....

129

Locations of Smart Grid Demonstration and Large-Scale Energy...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Locations of Smart Grid Demonstration and Large-Scale Energy Storage Projects Locations of Smart Grid Demonstration and Large-Scale Energy Storage Projects Map of the United States...

130

A Review of "Small-Scale Wind Turbines Policy Perspectives and  

E-Print Network (OSTI)

ERG/200607 A Review of "Small-Scale Wind Turbines ­ Policy Perspectives and Recommendations of Engineering Mathematics at Dalhousie University. #12;Hughes-Long: A Review of Small-Scale Wind Turbines proposed changes to their municipal Bylaws to allow the installation of "small-scale" wind turbines (i

Hughes, Larry

131

Large Scale Computing and Storage Requirements for High Energy Physics  

E-Print Network (OSTI)

Director Editors Richard Gerber Harvey Wasserman NERSC UserServices Group NERSC User Services Group Large ScaleNERSC

Gerber, Richard A.

2011-01-01T23:59:59.000Z

132

Impacts of large quantities of wind energy on the electric power system  

E-Print Network (OSTI)

Wind energy has been surging on a global scale. Significant penetration of wind energy is expected to take place in the power system, bringing new challenges because of the variability and uncertainty of this renewable ...

Yao, Yuan, S.M. Massachusetts Institute of Technology

2011-01-01T23:59:59.000Z

133

Algorithms for Large-Scale Internet Measurements  

E-Print Network (OSTI)

As the Internet has grown in size and importance to society, it has become increasingly difficult to generate global metrics of interest that can be used to verify proposed algorithms or monitor performance. This dissertation tackles the problem by proposing several novel algorithms designed to perform Internet-wide measurements using existing or inexpensive resources. We initially address distance estimation in the Internet, which is used by many distributed applications. We propose a new end-to-end measurement framework called Turbo King (T-King) that uses the existing DNS infrastructure and, when compared to its predecessor King, obtains delay samples without bias in the presence of distant authoritative servers and forwarders, consumes half the bandwidth, and reduces the impact on caches at remote servers by several orders of magnitude. Motivated by recent interest in the literature and our need to find remote DNS nameservers, we next address Internet-wide service discovery by developing IRLscanner, whose main design objectives have been to maximize politeness at remote networks, allow scanning rates that achieve coverage of the Internet in minutes/hours (rather than weeks/months), and significantly reduce administrator complaints. Using IRLscanner and 24-hour scan durations, we perform 20 Internet-wide experiments using 6 different protocols (i.e., DNS, HTTP, SMTP, EPMAP, ICMP and UDP ECHO). We analyze the feedback generated and suggest novel approaches for reducing the amount of blowback during similar studies, which should enable researchers to collect valuable experimental data in the future with significantly fewer hurdles. We finally turn our attention to Intrusion Detection Systems (IDS), which are often tasked with detecting scans and preventing them; however, it is currently unknown how likely an IDS is to detect a given Internet-wide scan pattern and whether there exist sufficiently fast stealth techniques that can remain virtually undetectable at large-scale. To address these questions, we propose a novel model for the windowexpiration rules of popular IDS tools (i.e., Snort and Bro), derive the probability that existing scan patterns (i.e., uniform and sequential) are detected by each of these tools, and prove the existence of stealth-optimal patterns.

Leonard, Derek Anthony

2010-12-01T23:59:59.000Z

134

How Much Energy Is Transferred from the Winds to the Thermocline on ENSO Time Scales?  

E-Print Network (OSTI)

How Much Energy Is Transferred from the Winds to the Thermocline on ENSO Time Scales? JACLYN N the winds (via wind power) and changes in the storage of available potential energy in the tropical ocean~o is characterized by a decrease in wind power that leads to a decrease in available potential energy, and hence

135

Introduction to Small-Scale Wind Energy Systems (Including RETScreen Case  

Open Energy Info (EERE)

Introduction to Small-Scale Wind Energy Systems (Including RETScreen Case Introduction to Small-Scale Wind Energy Systems (Including RETScreen Case Study) (Webinar) Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Introduction to Small-Scale Wind Energy Systems (Including RETScreen Case Study) (Webinar) Focus Area: Renewable Energy Topics: System & Application Design Website: www.leonardo-energy.org/webinar-introduction-small-scale-wind-energy-s Equivalent URI: cleanenergysolutions.org/content/introduction-small-scale-wind-energy- Language: English Policies: Deployment Programs DeploymentPrograms: Project Development This video teaches the viewer about wind turbines and RETscreen's wind module, which can be used to project the cost and production of a wind

136

Quantum noises and the large scale structure  

E-Print Network (OSTI)

We propose that cosmological density perturbation may originate from passive fluctuations of the inflaton, which are induced by colored quantum noise due to the coupling of the inflaton to the quantum environment. At small scales, the fluctuations grow with time to become nearly scale-invariant. However, the larger-scale modes cross out the horizon earlier and do not have enough time to grow, thus resulting in a suppression of the density perturbation. This may explain the observed low quadrupole in the CMB anisotropy data and and potentially unveil the initial time of inflation. We also discuss the implications to the running spectral index and the non-Gaussianity of the primordial density perturbation.

Wo-Lung Lee

2007-01-31T23:59:59.000Z

137

Initial Economic Analysis of Utility-Scale Wind Integration in Hawaii  

DOE Green Energy (OSTI)

This report summarizes an analysis, conducted by the National Renewable Energy Laboratory (NREL) in May 2010, of the economic characteristics of a particular utility-scale wind configuration project that has been referred to as the 'Big Wind' project.

Not Available

2012-03-01T23:59:59.000Z

138

Designing Electricity Markets with Large Shares of Wind Power  

E-Print Network (OSTI)

-time (RT) prices in Iowa (MEC interface), May 11­17, 2009. MISO NYISO PJM ERCOT CAISO Wind Power Capacity) and PJM have already introduced rules for mandatory real-time bidding and control of wind power

Kemner, Ken

139

Large Scale Computing and Storage Requirements for Fusion Energy...  

NLE Websites -- All DOE Office Websites (Extended Search)

at NERSC HPC Requirements Reviews Requirements for Science: Target 2014 Fusion Energy Sciences (FES) Large Scale Computing and Storage Requirements for Fusion Energy...

140

Solving large scale polynomial convex problems on \\ell_1/nuclear ...  

E-Print Network (OSTI)

Oct 24, 2012 ... Solving large scale polynomial convex problems on \\ell_1/nuclear norm balls by randomized first-order algorithms. Aharon Ben-Tal (abental ...

Note: This page contains sample records for the topic "large scale wind" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Large Scale Computing and Storage Requirements for Nuclear Physics Research  

E-Print Network (OSTI)

outlined in the 2011 DOE Strategic Plan†. † U.S. Departmentstrategic plans. Large Scale Computing and Storage Requirements for Nuclear Physics DOE  

Gerber, Richard A.

2012-01-01T23:59:59.000Z

142

Large Scale Computing and Storage Requirements for Basic Energy...  

NLE Websites -- All DOE Office Websites (Extended Search)

at NERSC HPC Requirements Reviews Requirements for Science: Target 2014 Basic Energy Sciences (BES) Large Scale Computing and Storage Requirements for Basic Energy...

143

Modal Dynamics of Large Wind Turbines with Different Support Structures  

SciTech Connect

This paper presents modal dynamics of floating-platform-supported and monopile-supported offshore wind turbines.

Bir, G.; Jonkman, J.

2008-07-01T23:59:59.000Z

144

Large-Scale Aspects of the United States Hydrologic Cycle  

Science Conference Proceedings (OSTI)

A large-scale, gridpoint, atmospheric, hydrologic climatology consisting of atmospheric precipitable water, precipitation, atmospheric moisture flux convergence, and a residual evaporation for the conterminous United States is described. A large-...

John O. Roads; Shyh-C. Chen; Alexander K. Guetter; Konstantine P. Georgakakos

1994-09-01T23:59:59.000Z

145

LARGE-SCALE FLOWS IN PROMINENCE CAVITIES  

Science Conference Proceedings (OSTI)

Regions of rarefied density often form cavities above quiescent prominences. We observed two different cavities with the Coronal Multichannel Polarimeter on 2005 April 21 and with Hinode/EIS on 2008 November 8. Inside both of these cavities, we find coherent velocity structures based on spectral Doppler shifts. These flows have speeds of 5-10 km s{sup -1}, occur over length scales of tens of megameters, and persist for at least 1 hr. Flows in cavities are an example of the nonstatic nature of quiescent structures in the solar atmosphere.

Schmit, D. J. [Department of Astrophysical and Planetary Sciences, University of Colorado-Boulder, UCB 391, Boulder, CO 80309 (United States); Gibson, S. E.; Tomczyk, S. [High Altitude Observatory, National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307 (United States); Reeves, K. K. [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, MS 58, Cambridge, MA 02138 (United States); Sterling, Alphonse C. [NASA Marshall Space Flight Center, Space Science Office, VP62, Huntsville, AL 35805 (United States); Brooks, D. H. [Space Science Division, Naval Research Laboratory, Washington, DC 20375 (United States); Williams, D. R. [Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey RH5 6NT (United Kingdom); Tripathi, D. [Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA (United Kingdom)

2009-08-01T23:59:59.000Z

146

Investigating the Influence of Synoptic-Scale Monsoonal Winds and Mesoscale Circulations on Diurnal Weather Patterns over Kenya Using a Mesoscale Numerical Model  

Science Conference Proceedings (OSTI)

The Regional Atmospheric Modeling System (RAMS) developed at Colorado State University (CSU) was used to investigate the influence of the large-scale monsoonal winds and the mesoscale local circulations on the diurnal precipitation pattern over ...

Joseph R. Mukabana; Roger A. Piekle

1996-02-01T23:59:59.000Z

147

Large Scale Weather Control Using Nuclear Reactors  

E-Print Network (OSTI)

It is pointed out that controlled release of thermal energy from fission type nuclear reactors can be used to alter weather patterns over significantly large geographical regions. (1) Nuclear heat creates a low pressure region, which can be used to draw moist air from oceans, onto deserts. (2) Creation of low pressure zones over oceans using Nuclear heat can lead to Controlled Cyclone Creation (CCC).(3) Nuclear heat can also be used to melt glaciers and control water flow in rivers.

Moninder Singh Modgil

2002-10-02T23:59:59.000Z

148

Introduction to Small-Scale Wind Energy Systems (Including RETScreen...  

Open Energy Info (EERE)

Programs DeploymentPrograms: Project Development This video teaches the viewer about wind turbines and RETscreen's wind...

149

Relation between Saffir–Simpson Hurricane Scale Wind ...  

Science Conference Proceedings (OSTI)

... verifying the results based on the power law as ... of the open-sea roughness in winds greater than ... continue to increase at mean wind speeds beyond ...

2013-07-24T23:59:59.000Z

150

Goethite Bench-scale and Large-scale Preparation Tests  

SciTech Connect

The Hanford Waste Treatment and Immobilization Plant (WTP) is the keystone for cleanup of high-level radioactive waste from our nation's nuclear defense program. The WTP will process high-level waste from the Hanford tanks and produce immobilized high-level waste glass for disposal at a national repository, low activity waste (LAW) glass, and liquid effluent from the vitrification off-gas scrubbers. The liquid effluent will be stabilized into a secondary waste form (e.g. grout-like material) and disposed on the Hanford site in the Integrated Disposal Facility (IDF) along with the low-activity waste glass. The major long-term environmental impact at Hanford results from technetium that volatilizes from the WTP melters and finally resides in the secondary waste. Laboratory studies have indicated that pertechnetate ({sup 99}TcO{sub 4}{sup -}) can be reduced and captured into a solid solution of {alpha}-FeOOH, goethite (Um 2010). Goethite is a stable mineral and can significantly retard the release of technetium to the environment from the IDF. The laboratory studies were conducted using reaction times of many days, which is typical of environmental subsurface reactions that were the genesis of this new process. This study was the first step in considering adaptation of the slow laboratory steps to a larger-scale and faster process that could be conducted either within the WTP or within the effluent treatment facility (ETF). Two levels of scale-up tests were conducted (25x and 400x). The largest scale-up produced slurries of Fe-rich precipitates that contained rhenium as a nonradioactive surrogate for {sup 99}Tc. The slurries were used in melter tests at Vitreous State Laboratory (VSL) to determine whether captured rhenium was less volatile in the vitrification process than rhenium in an unmodified feed. A critical step in the technetium immobilization process is to chemically reduce Tc(VII) in the pertechnetate (TcO{sub 4}{sup -}) to Tc(Iv)by reaction with the ferrous ion, Fe{sup 2+}-Fe{sup 2+} is oxidized to Fe{sup 3+} - in the presence of goethite seed particles. Rhenium does not mimic that process; it is not a strong enough reducing agent to duplicate the TcO{sub 4}{sup -}/Fe{sup 2+} redox reactions. Laboratory tests conducted in parallel with these scaled tests identified modifications to the liquid chemistry necessary to reduce ReO{sub 4}{sup -} and capture rhenium in the solids at levels similar to those achieved by Um (2010) for inclusion of Tc into goethite. By implementing these changes, Re was incorporated into Fe-rich solids for testing at VSL. The changes also changed the phase of iron that was in the slurry product: rather than forming goethite ({alpha}-FeOOH), the process produced magnetite (Fe{sub 3}O{sub 4}). Magnetite was considered by Pacific Northwest National Laboratory (PNNL) and VSL to probably be a better product to improve Re retention in the melter because it decomposes at a higher temperature than goethite (1538 C vs. 136 C). The feasibility tests at VSL were conducted using Re-rich magnetite. The tests did not indicate an improved retention of Re in the glass during vitrification, but they did indicate an improved melting rate (+60%), which could have significant impact on HLW processing. It is still to be shown whether the Re is a solid solution in the magnetite as {sup 99}Tc was determined to be in goethite.

Josephson, Gary B.; Westsik, Joseph H.

2011-10-23T23:59:59.000Z

151

2 Large-Scale Data Sets  

E-Print Network (OSTI)

help in preparing this material. Computational Science ? Use of computer simulation as a tool for greater understanding of the real world – Complements experimentation and theory ? Problems are increasingly computationally challenging – Large parallel machines needed to perform calculations – Critical to leverage parallelism in all phases ? Data access is a huge challenge – Using parallelism to obtain performance – Finding usable, efficient, portable interfaces – Understanding and tuning I/O IBM BG/L system. Visualization of entropy in Terascale Supernova Initiative application. Image from Kwan-Liu Ma’s visualization team at UC Davis. Argonne National

Rob Ross; Thanks To Rob Latham; Rajeev Thakur; Marc Unangst; Brent Welch For Their

2009-01-01T23:59:59.000Z

152

innovati nNREL Confirms Large Potential for Grid Integration of Wind, Solar Power  

E-Print Network (OSTI)

innovati nNREL Confirms Large Potential for Grid Integration of Wind, Solar Power To fully harvest the nation's bountiful wind and solar resources, it is critical to know how much electrical power from at adding enough wind and solar power capacity to the grid to produce 35% of the WestConnect's electricity

153

A large scale study of text-messaging use  

Science Conference Proceedings (OSTI)

Text messaging has become a popular form of communication with mobile phones worldwide. We present findings from a large scale text messaging study of 70 university students in the United States. We collected almost 60, 000 text messages over a period ... Keywords: large-scale study, mobile device, short message service, sms, text messaging, texting

Agathe Battestini; Vidya Setlur; Timothy Sohn

2010-09-01T23:59:59.000Z

154

Large-Scale Eucalyptus Energy Farms and Power Cogeneration1  

E-Print Network (OSTI)

Large-Scale Eucalyptus Energy Farms and Power Cogeneration1 Robert C. Noronla2 The initiation of a large-scale cogeneration project, especially one that combines construction of the power generation supplemental fuel source must be sought if the cogeneration facility will consume more fuel than

Standiford, Richard B.

155

Opportunities and Challenges to Scaling-up Wind Power in Vietnam | Open  

Open Energy Info (EERE)

Challenges to Scaling-up Wind Power in Vietnam Challenges to Scaling-up Wind Power in Vietnam Jump to: navigation, search Name Opportunities and Challenges to Scaling-up Wind Power in Vietnam Agency/Company /Organization Asian Development Bank Sector Energy Focus Area Renewable Energy, Wind Topics Co-benefits assessment, Market analysis, Pathways analysis, Background analysis, Technology characterizations Resource Type Presentation Website http://www.adb.org/documents/e Country Vietnam UN Region South-Eastern Asia References Vietnam-Wind Power Opportunities and Challenges [1] References ↑ "Vietnam-Wind Power Opportunities and Challenges" Retrieved from "http://en.openei.org/w/index.php?title=Opportunities_and_Challenges_to_Scaling-up_Wind_Power_in_Vietnam&oldid=383401"

156

A Simulator for Large-Scale Parallel Computer Architectures  

Science Conference Proceedings (OSTI)

Efficient design of hardware and software for large-scale parallel execution requires detailed understanding of the interactions between the application, computer, and network. The authors have developed a macro-scale simulator SST/macro that permits ... Keywords: Computer Architecture Simulation, Macro-scale Simulator, Message Passing Interface, Network Congestion, Network Models

Helgi Adalsteinsson; Scott Cranford; David A. Evensky; Joseph P. Kenny; Jackson Mayo; Ali Pinar; Curtis L. Janssen

2010-04-01T23:59:59.000Z

157

Large-Scale Hydropower Basics | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Large-Scale Hydropower Basics Large-Scale Hydropower Basics Large-Scale Hydropower Basics August 14, 2013 - 3:11pm Addthis Large-scale hydropower plants are generally developed to produce electricity for government or electric utility projects. These plants are more than 30 megawatts (MW) in size, and there is more than 80,000 MW of installed generation capacity in the United States today. Most large-scale hydropower projects use a dam and a reservoir to retain water from a river. When the stored water is released, it passes through and rotates turbines, which spin generators to produce electricity. Water stored in a reservoir can be accessed quickly for use during times when the demand for electricity is high. Dammed hydropower projects can also be built as power storage facilities.

158

Large-Scale Hydropower Basics | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Large-Scale Hydropower Basics Large-Scale Hydropower Basics Large-Scale Hydropower Basics August 14, 2013 - 3:11pm Addthis Large-scale hydropower plants are generally developed to produce electricity for government or electric utility projects. These plants are more than 30 megawatts (MW) in size, and there is more than 80,000 MW of installed generation capacity in the United States today. Most large-scale hydropower projects use a dam and a reservoir to retain water from a river. When the stored water is released, it passes through and rotates turbines, which spin generators to produce electricity. Water stored in a reservoir can be accessed quickly for use during times when the demand for electricity is high. Dammed hydropower projects can also be built as power storage facilities.

159

Analysis of Wind Power and Load Data at Multiple Time Scales  

E-Print Network (OSTI)

29   Appendix A. PJM Windat Multiple Time Scales Appendix A. PJM Wind Data The windpower data for the PJM control area cover the period January

Coughlin, Katie

2011-01-01T23:59:59.000Z

160

Nesting large-eddy simulations within mesoscale simulations for wind energy applications  

DOE Green Energy (OSTI)

With increasing demand for more accurate atmospheric simulations for wind turbine micrositing, for operational wind power forecasting, and for more reliable turbine design, simulations of atmospheric flow with resolution of tens of meters or higher are required. These time-dependent large-eddy simulations (LES), which resolve individual atmospheric eddies on length scales smaller than turbine blades and account for complex terrain, are possible with a range of commercial and open-source software, including the Weather Research and Forecasting (WRF) model. In addition to 'local' sources of turbulence within an LES domain, changing weather conditions outside the domain can also affect flow, suggesting that a mesoscale model provide boundary conditions to the large-eddy simulations. Nesting a large-eddy simulation within a mesoscale model requires nuanced representations of turbulence. Our group has improved the Weather and Research Forecasting model's (WRF) LES capability by implementing the Nonlinear Backscatter and Anisotropy (NBA) subfilter stress model following Kosovic (1997) and an explicit filtering and reconstruction technique to compute the Resolvable Subfilter-Scale (RSFS) stresses (following Chow et al, 2005). We have also implemented an immersed boundary method (IBM) in WRF to accommodate complex terrain. These new models improve WRF's LES capabilities over complex terrain and in stable atmospheric conditions. We demonstrate approaches to nesting LES within a mesoscale simulation for farms of wind turbines in hilly regions. Results are sensitive to the nesting method, indicating that care must be taken to provide appropriate boundary conditions, and to allow adequate spin-up of turbulence in the LES domain.

Lundquist, J K; Mirocha, J D; Chow, F K; Kosovic, B; Lundquist, K A

2008-09-08T23:59:59.000Z

Note: This page contains sample records for the topic "large scale wind" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

2009 Wind Technologies Market Report  

E-Print Network (OSTI)

AWEA). 2010b. AWEA Small Wind Turbine Global Market Survey,html David, A. 2009. Wind Turbines: Industry and Tradewhich new large-scale wind turbines were installed in 2009 (

Wiser, Ryan

2010-01-01T23:59:59.000Z

162

2009 Wind Technologies Market Report  

E-Print Network (OSTI)

al. 2010. Large-scale Offshore Wind for the United States:assistance with the offshore wind energy discussion; DonnaTechnologies Market Report Offshore Wind Power Project and

Wiser, Ryan

2010-01-01T23:59:59.000Z

163

WINDTUR1. TXT Large Wind Turbine Machines for ...  

Science Conference Proceedings (OSTI)

... 4. Reducing the diameter of the tower to lessen its shadow effect on the wind striking the turbine. D Suggested design changesO ...

2011-08-02T23:59:59.000Z

164

The cube: a very large-scale interactive engagement space  

Science Conference Proceedings (OSTI)

"The Cube" is a unique facility that combines 48 large multi-touch screens and very large-scale projection surfaces to form one of the world's largest interactive learning and engagement spaces. The Cube facility is part of the Queensland University ... Keywords: interactive wall displays, multi-touch, very large displays

Markus Rittenbruch, Andrew Sorensen, Jared Donovan, Debra Polson, Michael Docherty, Jeff Jones

2013-10-01T23:59:59.000Z

165

Life Cycle Greenhouse Gas Emissions of Utility-Scale Wind Power: Systematic Review and Harmonization  

Science Conference Proceedings (OSTI)

A systematic review and harmonization of life cycle assessment (LCA) literature of utility-scale wind power systems was performed to determine the causes of and, where possible, reduce variability in estimates of life cycle greenhouse gas (GHG) emissions. Screening of approximately 240 LCAs of onshore and offshore systems yielded 72 references meeting minimum thresholds for quality, transparency, and relevance. Of those, 49 references provided 126 estimates of life cycle GHG emissions. Published estimates ranged from 1.7 to 81 grams CO{sub 2}-equivalent per kilowatt-hour (g CO{sub 2}-eq/kWh), with median and interquartile range (IQR) both at 12 g CO{sub 2}-eq/kWh. After adjusting the published estimates to use consistent gross system boundaries and values for several important system parameters, the total range was reduced by 47% to 3.0 to 45 g CO{sub 2}-eq/kWh and the IQR was reduced by 14% to 10 g CO{sub 2}-eq/kWh, while the median remained relatively constant (11 g CO{sub 2}-eq/kWh). Harmonization of capacity factor resulted in the largest reduction in variability in life cycle GHG emission estimates. This study concludes that the large number of previously published life cycle GHG emission estimates of wind power systems and their tight distribution suggest that new process-based LCAs of similar wind turbine technologies are unlikely to differ greatly. However, additional consequential LCAs would enhance the understanding of true life cycle GHG emissions of wind power (e.g., changes to other generators operations when wind electricity is added to the grid), although even those are unlikely to fundamentally change the comparison of wind to other electricity generation sources.

Dolan, S. L.; Heath, G. A.

2012-04-01T23:59:59.000Z

166

DOE Completes Large-Scale Carbon Sequestration Project Awards | Department  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

DOE Completes Large-Scale Carbon Sequestration Project Awards DOE Completes Large-Scale Carbon Sequestration Project Awards DOE Completes Large-Scale Carbon Sequestration Project Awards November 17, 2008 - 4:58pm Addthis Regional Partner to Demonstrate Safe and Permanent Storage of 2 Million Tons of CO2 at Wyoming Site WASHINGTON, DC - Completing a series of awards through its Regional Carbon Sequestration Partnership Program, the U.S. Department of Energy (DOE) today awarded $66.9 million to the Big Sky Regional Carbon Sequestration Partnership for the Department's seventh large-scale carbon sequestration project. Led by Montana State University-Bozeman, the Partnership will conduct a large-volume test in the Nugget Sandstone formation to demonstrate the ability of a geologic formation to safely, permanently and economically

167

DOE Completes Large-Scale Carbon Sequestration Project Awards | Department  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Completes Large-Scale Carbon Sequestration Project Awards Completes Large-Scale Carbon Sequestration Project Awards DOE Completes Large-Scale Carbon Sequestration Project Awards November 17, 2008 - 4:58pm Addthis Regional Partner to Demonstrate Safe and Permanent Storage of 2 Million Tons of CO2 at Wyoming Site WASHINGTON, DC - Completing a series of awards through its Regional Carbon Sequestration Partnership Program, the U.S. Department of Energy (DOE) today awarded $66.9 million to the Big Sky Regional Carbon Sequestration Partnership for the Department's seventh large-scale carbon sequestration project. Led by Montana State University-Bozeman, the Partnership will conduct a large-volume test in the Nugget Sandstone formation to demonstrate the ability of a geologic formation to safely, permanently and economically

168

Total Cost Per MwH for all common large scale power generation sources |  

Open Energy Info (EERE)

Total Cost Per MwH for all common large scale power generation sources Total Cost Per MwH for all common large scale power generation sources Home > Groups > DOE Wind Vision Community In the US DOEnergy, are there calcuations for real cost of energy considering the negative, socialized costs of all commercial large scale power generation soruces ? I am talking about the cost of mountain top removal for coal mined that way, the trip to the power plant, the sludge pond or ash heap, the cost of the gas out of the stack, toxificaiton of the lakes and streams, plant decommision costs. For nuclear yiou are talking about managing the waste in perpetuity. The plant decomission costs and so on. What I am tring to get at is the 'real cost' per MWh or KWh for the various sources ? I suspect that the costs commonly quoted for fossil fuels and nucelar are

169

The Steadman Wind Chill: An Improvement over Present Scales  

Science Conference Proceedings (OSTI)

Because of shortcomings in the current wind chill formulation, which did not consider the metabolic heat generation of the human body, a new formula is proposed for operational implementation. This formula, referred to as the Steadman wind chill, ...

Robert G. Quayle; Robert G. Steadman

1998-12-01T23:59:59.000Z

170

Energy Department Applauds Nation's First Large-Scale Industrial Carbon  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Nation's First Large-Scale Industrial Nation's First Large-Scale Industrial Carbon Capture and Storage Facility Energy Department Applauds Nation's First Large-Scale Industrial Carbon Capture and Storage Facility August 24, 2011 - 6:23pm Addthis Washington, D.C. - The U.S. Department of Energy issued the following statement in support of today's groundbreaking for construction of the nation's first large-scale industrial carbon capture and storage (ICCS) facility in Decatur, Illinois. Supported by the 2009 economic stimulus legislation - the American Recovery and Reinvestment Act - the ambitious project will capture and store one million tons of carbon dioxide (CO2) per year produced as the result of processing corn into fuel-grade ethanol from the nearby Archer Daniels Midland biofuels plant. Since all of

171

ARM - Evaluation Product - Vertical Air Motion during Large-Scale  

NLE Websites -- All DOE Office Websites (Extended Search)

ProductsVertical Air Motion during Large-Scale ProductsVertical Air Motion during Large-Scale Stratiform Rain Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Evaluation Product : Vertical Air Motion during Large-Scale Stratiform Rain Site(s) NIM SGP General Description The Vertical Air Motion during Large-Scale Stratiform Rain (VERVELSR) value-added product (VAP) uses the unique properties of a 95-GHz radar Doppler velocity spectra to produce vertical profiles of air motion during low-to-moderate (1-20 mm/hr) rainfall events It is designed to run at ARM sites that include a W-band ARM cloud radar (WACR) radar with spectra data processing. The VERVELSR VAP, based on the work of Giangrande et al. (2010), operates by exploiting a resonance effect that occurs in

172

Energy Department Applauds Nation's First Large-Scale Industrial Carbon  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Energy Department Applauds Nation's First Large-Scale Industrial Energy Department Applauds Nation's First Large-Scale Industrial Carbon Capture and Storage Facility Energy Department Applauds Nation's First Large-Scale Industrial Carbon Capture and Storage Facility August 24, 2011 - 6:23pm Addthis Washington, D.C. - The U.S. Department of Energy issued the following statement in support of today's groundbreaking for construction of the nation's first large-scale industrial carbon capture and storage (ICCS) facility in Decatur, Illinois. Supported by the 2009 economic stimulus legislation - the American Recovery and Reinvestment Act - the ambitious project will capture and store one million tons of carbon dioxide (CO2) per year produced as the result of processing corn into fuel-grade ethanol from the nearby Archer Daniels Midland biofuels plant. Since all of

173

Large-Scale Industrial Carbon Capture, Storage Plant Begins Construction |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Large-Scale Industrial Carbon Capture, Storage Plant Begins Large-Scale Industrial Carbon Capture, Storage Plant Begins Construction Large-Scale Industrial Carbon Capture, Storage Plant Begins Construction August 24, 2011 - 1:00pm Addthis Washington, DC - Construction activities have begun at an Illinois ethanol plant that will demonstrate carbon capture and storage. The project, sponsored by the U.S. Department of Energy's Office of Fossil Energy, is the first large-scale integrated carbon capture and storage (CCS) demonstration project funded by the American Recovery and Reinvestment Act (ARRA) to move into the construction phase. Led by the Archer Daniels Midland Company (ADM), a member of DOE's Midwest Geological Sequestration Consortium, the Illinois-ICCS project is designed to sequester approximately 2,500 metric tons of carbon dioxide

174

Large-Scale Industrial Carbon Capture, Storage Plant Begins Construction |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Large-Scale Industrial Carbon Capture, Storage Plant Begins Large-Scale Industrial Carbon Capture, Storage Plant Begins Construction Large-Scale Industrial Carbon Capture, Storage Plant Begins Construction August 24, 2011 - 1:00pm Addthis Washington, DC - Construction activities have begun at an Illinois ethanol plant that will demonstrate carbon capture and storage. The project, sponsored by the U.S. Department of Energy's Office of Fossil Energy, is the first large-scale integrated carbon capture and storage (CCS) demonstration project funded by the American Recovery and Reinvestment Act (ARRA) to move into the construction phase. Led by the Archer Daniels Midland Company (ADM), a member of DOE's Midwest Geological Sequestration Consortium, the Illinois-ICCS project is designed to sequester approximately 2,500 metric tons of carbon dioxide

175

Materialized community ground models for large-scale earthquake simulation  

Science Conference Proceedings (OSTI)

Large-scale earthquake simulation requires source datasets which describe the highly heterogeneous physical characteristics of the earth in the region under simulation. Physical characteristic datasets are the first stage in a simulation pipeline which ...

Steven W. Schlosser; Michael P. Ryan; Ricardo Taborda; Julio López; David R. O'Hallaron; Jacobo Bielak

2008-11-01T23:59:59.000Z

176

Advanced concepts in large-scale network simulation  

Science Conference Proceedings (OSTI)

This tutorial paper reviews existing concepts and future directions in selected areas related to simulation of large-scale networks. It covers specifically topics in traffic modeling, simulation of routing, network emulation, and real-time simulation.

David M. Nicol; Michael Liljenstam; Jason Liu

2005-12-01T23:59:59.000Z

177

Large-Scale Meteorology and Deep Convection during TRMM KWAJEX  

Science Conference Proceedings (OSTI)

An overview of the large-scale behavior of the atmosphere during the Tropical Rainfall Measuring Mission (TRMM) Kwajalein Experiment (KWAJEX) is presented. Sounding and ground radar data collected during KWAJEX, and several routinely available ...

Adam H. Sobel; Sandra E. Yuter; Christopher S. Bretherton; George N. Kiladis

2004-02-01T23:59:59.000Z

178

Data mining techniques for large-scale gene expression analysis  

E-Print Network (OSTI)

Modern computational biology is awash in large-scale data mining problems. Several high-throughput technologies have been developed that enable us, with relative ease and little expense, to evaluate the coordinated expression ...

Palmer, Nathan Patrick

2011-01-01T23:59:59.000Z

179

Infrastructure for large-scale tests in marine autonomy  

E-Print Network (OSTI)

This thesis focuses on the development of infrastructure for research with large-scale autonomous marine vehicle fleets and the design of sampling trajectories for compressive sensing (CS). The newly developed infrastructure ...

Hummel, Robert A. (Robert Andrew)

2012-01-01T23:59:59.000Z

180

Platforms and real options in large-scale engineering systems  

E-Print Network (OSTI)

This thesis introduces a framework and two methodologies that enable engineering management teams to assess the value of real options in programs of large-scale, partially standardized systems implemented a few times over ...

Kalligeros, Konstantinos C., 1976-

2006-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "large scale wind" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Technoeconomic Evaluation of Large-Scale Electrolytic Hydrogen Production Technologies  

Science Conference Proceedings (OSTI)

Large-scale production of electrolytic hydrogen and oxygen could increase use of baseload and off-peak surplus power. To be competitive, however, water electrolysis will require low-cost electricity.

1985-09-20T23:59:59.000Z

182

Decomposition methods for large scale stochastic and robust optimization problems  

E-Print Network (OSTI)

We propose new decomposition methods for use on broad families of stochastic and robust optimization problems in order to yield tractable approaches for large-scale real world application. We introduce a new type of a ...

Becker, Adrian Bernard Druke

2011-01-01T23:59:59.000Z

183

Student Pages: RFP-Large-Scale Diversion of Water  

NLE Websites -- All DOE Office Websites (Extended Search)

Supplying Our Water Needs H2O Request For Proposal Large Scale Diversion of Water U.S. Army Corp of Engineers-Chicago District online Be sure to submit the online sign-off each...

184

On solving large scale polynomial convex problems by randomized ...  

E-Print Network (OSTI)

plications), the (unimprovable in the large-scale case) rate of convergence of FOM's ...... mjnj min[mj,nj]) a.o.) and eigenvalue decomposition of a matrix from Sm.

185

Large-Scale Industrial CCS Projects Selected for Continued Testing |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Large-Scale Industrial CCS Projects Selected for Continued Testing Large-Scale Industrial CCS Projects Selected for Continued Testing Large-Scale Industrial CCS Projects Selected for Continued Testing June 10, 2010 - 1:00pm Addthis Washington, DC - Three Recovery Act funded projects have been selected by the U.S. Department of Energy (DOE) to continue testing large-scale carbon capture and storage (CCS) from industrial sources. The projects - located in Texas, Illinois, and Louisiana - were initially selected for funding in October 2009 as part of a $1.4 billion effort to capture carbon dioxide (CO2) from industrial sources for storage or beneficial use. The first phase of research and development (R&D) included $21.6 million in Recovery Act funding and $22.5 million in private funding for a total initial investment of $44.1 million.

186

DOE Awards First Three Large-Scale Carbon Sequestration Projects |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

First Three Large-Scale Carbon Sequestration Projects First Three Large-Scale Carbon Sequestration Projects DOE Awards First Three Large-Scale Carbon Sequestration Projects October 9, 2007 - 3:14pm Addthis U.S. Projects Total $318 Million and Further President Bush's Initiatives to Advance Clean Energy Technologies to Confront Climate Change WASHINGTON, DC - In a major step forward for demonstrating the promise of clean energy technology, U.S Deputy Secretary of Energy Clay Sell today announced that the Department of Energy (DOE) awarded the first three large-scale carbon sequestration projects in the United States and the largest single set in the world to date. The three projects - Plains Carbon Dioxide Reduction Partnership; Southeast Regional Carbon Sequestration Partnership; and Southwest Regional Partnership for Carbon

187

CHALLENGES OF INTEGRATING LARGE AMOUNTS OF WIND Jonathan D. Rose  

E-Print Network (OSTI)

-300 MW, with the largest coal and nuclear power plants rated at 2,000 to 3,000 MW. Although wind energy are meshed networks of transmission lines connecting together cities, towns, and power plants

Hiskens, Ian A.

188

Large Wind Property Tax Reduction | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

reduced the taxable value of centrally-assessed* wind turbines with a capacity of 100 kilowatts (kW) or greater from 10% to 3% of assessed value, resulting in a property tax...

189

Aeroelastic Instabilities of Large Offshore and Onshore Wind Turbines: Preprint  

DOE Green Energy (OSTI)

This paper examines the aeroelastic stability of a 5-MW conceptual wind turbine mounted on a floating barge and presents results for onshore and offshore configurations for various conditions.

Bir, G.; Jonkman, J.

2007-08-01T23:59:59.000Z

190

New England Wind Forum: Wind Power Economics  

Wind Powering America (EERE)

State Activities Projects in New England Building Wind Energy in New England Wind Resource Wind Power Technology Economics Cost Components Determining Factors Influencing Wind Economics in New England How does wind compare to the cost of other electricity options? Markets Siting Policy Technical Challenges Issues Small Wind Large Wind Newsletter Perspectives Events Quick Links to States CT MA ME NH RI VT Bookmark and Share Wind Power Economics Long-Term Cost Trends Since the first major installations of commercial-scale wind turbines in the 1980s, the cost of energy from wind power projects has decreased substantially due to larger turbine generators, towers, and rotor lengths; scale economies associated with larger projects; improvements in manufacturing efficiency, and technological advances in turbine generator and blade design. These technological advances have allowed for higher generating capacities per turbine and more efficient capture of wind, especially at lower wind speeds.

191

Hull Wind II: A Case Study of the Development of a Second Large Wind Turbine Installation in the Town of Hull, MA  

E-Print Network (OSTI)

Hull Wind II: A Case Study of the Development of a Second Large Wind Turbine Installation of Massachusetts, Amherst, Massachusetts * Hull Municipal Light and Water, Hull, Massachusetts American Wind Energy community: since 2001 the town's municipal light plant (HMLP) has owned and operated "Hull Wind I

Massachusetts at Amherst, University of

192

Paper BL3.199 EWEC 2007 Wind Energy Conference and Exhibition BL3.199 Wake Modelling for intermediate and large wind farms  

E-Print Network (OSTI)

Paper BL3.199 EWEC 2007 Wind Energy Conference and Exhibition 1 BL3.199 Wake Modelling for intermediate and large wind farms Ole Rathmann1, 3 , Sten Frandsen1 , and Rebecca Barthelmie2, 1 1 Wind Energy to after the rotor) AT . #12;Paper BL3.199 EWEC 2007 Wind Energy Conference and Exhibition 2 Figure 1

193

Lessons from Large-Scale Renewable Energy Integration Studies: Preprint  

Science Conference Proceedings (OSTI)

In general, large-scale integration studies in Europe and the United States find that high penetrations of renewable generation are technically feasible with operational changes and increased access to transmission. This paper describes other key findings such as the need for fast markets, large balancing areas, system flexibility, and the use of advanced forecasting.

Bird, L.; Milligan, M.

2012-06-01T23:59:59.000Z

194

A holonic approach to model and deploy large scale simulations  

Science Conference Proceedings (OSTI)

Multi-Agent Based Simulations (MABS) for real-world problems may require a large number of agents. A possible solution is to distribute the simulation in multiple machines. Thus, we are forced to consider how Large Scale MABS can be deployed in order ...

Sebastian Rodriguez; Vincent Hilaire; Abder Koukam

2006-05-01T23:59:59.000Z

195

Computational challenges in large-scale air pollution modelling  

Science Conference Proceedings (OSTI)

Many difficulties must be overcome when large-scale air pollution models are treated numerically, because the physical and chemical processes in the atmosphere are very fast. This is why it is necessary to use a large space domain in order ... Keywords: air pollution models, finite elements, ordinary differential equations, parallel computational, partial differential equations, quasi-steady-state-approximation

Tzvetan Ostromsky; Wojciech Owczarz; Zahari Zlatev

2001-06-01T23:59:59.000Z

196

Large-scale structure of the fast solar wind  

E-Print Network (OSTI)

Sciences, University of California, San Diego, 9500 GilmanPh.D. Thesis, Univer- sity of California, San Diego (UCSD).at the University of California, San Diego and we are

Bisi, M. M.; Fallows, R. A.; Breen, A. R.; Habbal, S. Rifai; Jones, R. A.

2007-01-01T23:59:59.000Z

197

Large Scale Quantum-mechanical Calculations of Proteins, Nanomaterials and  

NLE Websites -- All DOE Office Websites (Extended Search)

Large Scale Quantum-mechanical Calculations of Proteins, Nanomaterials and Large Scale Quantum-mechanical Calculations of Proteins, Nanomaterials and Other Large Systems Event Sponsor: Leadership Computing Facility Seminar Start Date: Dec 5 2013 - 2:00pm Building/Room: Building 240/Room 4301 Location: Argonne National Laboratory Speaker(s): Dmitri G. Fedorov Speaker(s) Title: National Institute of Advanced Industrial Science and Technology (AIST) Host: Yuri Alexeev Our approach to large scale calculations is based on fragmenting a molecular system into pieces, and performing quantum-mechanical calculations of these fragments and their pairs in the fragment molecular orbital method (FMO). After a brief summary of the methodology, some typical applications to protein-ligand complexes, chemical reactions in explicit solvent, and nanomaterials (silicon nanowires, zeolites.

198

Characterizing Inflow Conditions Across the Rotor Disk of a Utility-Scale Wind Turbine (Poster)  

DOE Green Energy (OSTI)

Multi-megawatt utility-scale wind turbines operate in a turbulent, thermally-driven atmosphere where wind speed and air temperature vary with height. Turbines convert the wind's momentum into electrical power, and so changes in the atmosphere across the rotor disk influence the power produced by the turbine. To characterize the inflow into utility scale turbines at the National Wind Technology Center (NWTC) near Boulder, Colorado, NREL recently built two 135-meter inflow monitoring towers. This poster introduces the towers and the measurements that are made, showing some of the data obtained in the first few months of operation in 2011.

Clifton, A.; Lundquist, J. K.; Kelley, N.; Scott, G.; Jager, D.; Schreck, S.

2012-01-01T23:59:59.000Z

199

Commercial Scale Wind Incentive Program (Oregon) | Open Energy...  

Open Energy Info (EERE)

State Government Eligible Technologies Wind Active Incentive Yes Implementing Sector StateTerritory Energy Category Renewable Energy Incentive Programs Amount Varies Eligible...

200

Utility-Scale Wind Turbines | Open Energy Information  

Open Energy Info (EERE)

and Economic Development. Accessed September 27, 2013. References "U.S. Department of Energy. 2012 Market Report on U.S. Wind Technologies in Distributed Applications"...

Note: This page contains sample records for the topic "large scale wind" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Large-Scale Sea Level Response to Atmospheric Forcing along the West Coast of North America, Summer 1973  

Science Conference Proceedings (OSTI)

Along the west Coast of North America, the response of sea level to fluctuations in alongshore wind stress at large alongshore scales (> 1000 km) accounted for a substantial faction of the total sea level variance during summer 1973. Space-time ...

George R. Halliwell Jr.; J. S. Allen

1984-05-01T23:59:59.000Z

202

The Phoenix series large scale LNG pool fire experiments.  

SciTech Connect

The increasing demand for natural gas could increase the number and frequency of Liquefied Natural Gas (LNG) tanker deliveries to ports across the United States. Because of the increasing number of shipments and the number of possible new facilities, concerns about the potential safety of the public and property from an accidental, and even more importantly intentional spills, have increased. While improvements have been made over the past decade in assessing hazards from LNG spills, the existing experimental data is much smaller in size and scale than many postulated large accidental and intentional spills. Since the physics and hazards from a fire change with fire size, there are concerns about the adequacy of current hazard prediction techniques for large LNG spills and fires. To address these concerns, Congress funded the Department of Energy (DOE) in 2008 to conduct a series of laboratory and large-scale LNG pool fire experiments at Sandia National Laboratories (Sandia) in Albuquerque, New Mexico. This report presents the test data and results of both sets of fire experiments. A series of five reduced-scale (gas burner) tests (yielding 27 sets of data) were conducted in 2007 and 2008 at Sandia's Thermal Test Complex (TTC) to assess flame height to fire diameter ratios as a function of nondimensional heat release rates for extrapolation to large-scale LNG fires. The large-scale LNG pool fire experiments were conducted in a 120 m diameter pond specially designed and constructed in Sandia's Area III large-scale test complex. Two fire tests of LNG spills of 21 and 81 m in diameter were conducted in 2009 to improve the understanding of flame height, smoke production, and burn rate and therefore the physics and hazards of large LNG spills and fires.

Simpson, Richard B.; Jensen, Richard Pearson; Demosthenous, Byron; Luketa, Anay Josephine; Ricks, Allen Joseph; Hightower, Marion Michael; Blanchat, Thomas K.; Helmick, Paul H.; Tieszen, Sheldon Robert; Deola, Regina Anne; Mercier, Jeffrey Alan; Suo-Anttila, Jill Marie; Miller, Timothy J.

2010-12-01T23:59:59.000Z

203

Predictive Understanding of the Oceans' Wind-Driven Circulation on Interdecadal Time Scales  

SciTech Connect

The goal of this project was to obtain a predictive understanding of a major component of the climate systemâ??s interdecadal variability: the oceansâ?? wind-driven circulation. To do so, we developed and applied advanced computational and statistical methods to the problem of climate variability and climate change. The methodology was developed first for models of intermediate complexity, such as the quasi-geostrophic and the primitive equations, which describe the wind-driven, near-surface flow in mid-latitude ocean basins. Our computational work consisted in developing efficient multi-level methods to simulate this flow and study its dependence on physically relevant parameters. Our oceanographic and climate work consisted in applying these methods to study the bifurcations in the wind-driven circulation and their relevance to the flows observed at present and those that might occur in a warmer climate. Both aspects of the work are crucial for the efficient treatment of large-scale, eddy-resolving numerical simulations of the oceans and an increased understanding and better prediction of climate change. Considerable progress has been achieved in understanding ocean-atmosphere interaction in the mid-latitudes. An important by-product of this research is a novel approach to explaining the North Atlantic Oscillation.

Michael Ghil, P.I., Dept. of Atmospheric & Oceanic Sciences and IGPP, UCLA; Roger Temam, Co-P.I., Dept. of Mathematics, Indiana University; Y. Feliks, IIBR; E. Simonnet, INLN; and T.Tachim-Medjo, FIU, collaborators

2008-09-30T23:59:59.000Z

204

Length Scales of the Neutral Wind Profile over Homogeneous Terrain  

Science Conference Proceedings (OSTI)

The wind speed profile for the neutral boundary layer is derived for a number of mixing-length parameterizations, which account for the height of the boundary layer. The wind speed profiles show good agreement with the reanalysis of the Leipzig ...

Alfredo Peña; Sven-Erik Gryning; Jakob Mann; Charlotte B. Hasager

2010-04-01T23:59:59.000Z

205

Breakthrough Large-Scale Industrial Project Begins Carbon Capture and  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Breakthrough Large-Scale Industrial Project Begins Carbon Capture Breakthrough Large-Scale Industrial Project Begins Carbon Capture and Utilization Breakthrough Large-Scale Industrial Project Begins Carbon Capture and Utilization January 25, 2013 - 12:00pm Addthis Washington, DC - A breakthrough carbon capture, utilization, and storage (CCUS) project in Texas has begun capturing carbon dioxide (CO2) and piping it to an oilfield for use in enhanced oil recovery (EOR). Read the project factsheet The project at Air Products and Chemicals hydrogen production facility in Port Arthur, Texas, is significant for demonstrating both the effectiveness and commercial viability of CCUS technology as an option in helping mitigate atmospheric CO2 emissions. Funded in part through the American Recovery and Reinvestment Act (ARRA), the project is managed by the U.S.

206

Breakthrough Large-Scale Industrial Project Begins Carbon Capture and  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Breakthrough Large-Scale Industrial Project Begins Carbon Capture Breakthrough Large-Scale Industrial Project Begins Carbon Capture and Utilization Breakthrough Large-Scale Industrial Project Begins Carbon Capture and Utilization January 25, 2013 - 12:00pm Addthis Washington, DC - A breakthrough carbon capture, utilization, and storage (CCUS) project in Texas has begun capturing carbon dioxide (CO2) and piping it to an oilfield for use in enhanced oil recovery (EOR). Read the project factsheet The project at Air Products and Chemicals hydrogen production facility in Port Arthur, Texas, is significant for demonstrating both the effectiveness and commercial viability of CCUS technology as an option in helping mitigate atmospheric CO2 emissions. Funded in part through the American Recovery and Reinvestment Act (ARRA), the project is managed by the U.S.

207

COMMENTS OF THE LARGE-SCALE SOLAR ASSOCIATION TO DEPARTMENT  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

COMMENTS OF THE LARGE-SCALE SOLAR ASSOCIATION TO DEPARTMENT COMMENTS OF THE LARGE-SCALE SOLAR ASSOCIATION TO DEPARTMENT OF ENERGY'S RAPID RESPONSE TEAM FOR TRANSMISSION'S REQUEST FOR INFORMATION Submitted by electronic mail to: Lamont.Jackson@hq.doe.gov The Large-scale Solar Association appreciates this opportunity to respond to the Department of Energy's (DOE) Rapid Response Team for Transmission's (RRTT) Request for Information. 1 We applaud the DOE for creating the RRTT and continuing to advance the efforts already made under the Memorandum of Understanding (MOU) entered into by nine Federal agencies in 2009 to expedite electric transmission construction. We also applaud the federal and state agencies that have expanded the Renewable Energy Policy Group and the Renewable Energy Action Team in California to focus on transmission, and hope that the tremendous

208

Nevada Weatherizes Large-Scale Complex | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Nevada Weatherizes Large-Scale Complex Nevada Weatherizes Large-Scale Complex Nevada Weatherizes Large-Scale Complex July 1, 2010 - 10:11am Addthis What does this project do? This nonprofit weatherized a 22-unit low-income multifamily complex, reducing the building's duct leakage from 90 percent to just 5 percent. The weatherization program of the Rural Nevada Development Corporation (RNDC) reached a recent success in its eleven counties-wide territory. In June, the nonprofit finished weatherizing a 22-unit low-income multifamily complex, reducing the building's duct leakage from 90 percent to just 5 percent. "That is one big savings and is why I am proud of this project," says Dru Simerson, RNDC Weatherization Manager. RNDC's crew replaced all windows and 17 furnaces and installed floor

209

PHASE TRANSITION GENERATED COSMOLOGICAL MAGNETIC FIELD AT LARGE SCALES  

SciTech Connect

We constrain a primordial magnetic field (PMF) generated during a phase transition (PT) using the big bang nucleosynthesis bound on the relativistic energy density. The amplitude of the PMF at large scales is determined by the shape of the PMF spectrum outside its maximal correlation length scale. Even if the amplitude of the PMF at 1 Mpc is small, PT-generated PMFs can leave observable signatures in the potentially detectable relic gravitational wave background if a large enough fraction (1%-10%) of the thermal energy is converted into the PMF.

Kahniashvili, Tina [McWilliams Center for Cosmology and Department of Physics, Carnegie Mellon University, 5000 Forbes Ave., Pittsburgh, PA 15213 (United States); Tevzadze, Alexander G. [Abastumani Astrophysical Observatory, Ilia State University, 2A Kazbegi Ave., Tbilisi 0160 (Georgia); Ratra, Bharat, E-mail: tinatin@phys.ksu.edu, E-mail: aleko@tevza.org, E-mail: ratra@phys.ksu.edu [Department of Physics, Kansas State University, 116 Cardwell Hall, Manhattan, KS 66506 (United States)

2011-01-10T23:59:59.000Z

210

Metal hydride based isotope separation: Large-scale operations  

DOE Green Energy (OSTI)

A program to develop a metal hydride based hydrogen isotope separation process began at the Savannah River Laboratory in 1980. This semi-continuous gas chromatographic separation process will be used in new tritium facilities at the Savannah River Site. A tritium production unit is scheduled to start operation in 1993. An experimental, large-scale unit is currently being tested using protium and deuterium. Operation of the large-scale unit has demonstrated separation of mixed hydrogen isotopes (55% protium and 45% deuterium), resulting in protium and deuterium product streams with purities better than 99.5%. 3 refs., 4 figs.

Horen, A.S.; Lee, Myung W.

1991-01-01T23:59:59.000Z

211

Metal hydride based isotope separation: Large-scale operations  

DOE Green Energy (OSTI)

A program to develop a metal hydride based hydrogen isotope separation process began at the Savannah River Laboratory in 1980. This semi-continuous gas chromatographic separation process will be used in new tritium facilities at the Savannah River Site. A tritium production unit is scheduled to start operation in 1993. An experimental, large-scale unit is currently being tested using protium and deuterium. Operation of the large-scale unit has demonstrated separation of mixed hydrogen isotopes (55% protium and 45% deuterium), resulting in protium and deuterium product streams with purities better than 99.5%. 3 refs., 4 figs.

Horen, A.S.; Lee, Myung W.

1991-12-31T23:59:59.000Z

212

Wind Profiler Observations Preceding Outbreaks of Large Hail over Northeastern Colorado  

Science Conference Proceedings (OSTI)

Wind profiler, rawinsonde, and surface observations of the atmosphere over northeastern Colorado during the morning hours on 44 days were compared to the severity of subsequent thunderstorm activity. On half of thes days, large hail (diameter ?2 ...

David H. Kitzmiller; Wayne E. Mcgovern

1990-03-01T23:59:59.000Z

213

Safety aspects of large-scale handling of hydrogen  

DOE Green Energy (OSTI)

Since the decade of the 1950s, there has been a large increase in the quantity of hydrogen, especially liquid hydrogen, that has been produced, transported, and used. The technology of hydrogen, as it relates to safety, has also developed at the same time. The possible sources of hazards that can arise in the large-scale handling of hydrogen are recognized, and for the most part, sufficiently understood. These hazard sources are briefly discussed. 26 refs., 4 figs.

Edeskuty, F.J.; Stewart, W.F.

1988-01-01T23:59:59.000Z

214

Molldeing and Simulation of a Small-Scale Wind Turbine Generator in Isolated Distribution Network  

Science Conference Proceedings (OSTI)

In recent years, the wind energy capacity is rapidly increasing in importance as a share of electricity supply on worldwide basis. A small-scale wind turbine generator is usually installed in an isolated distribution network. This paper aims to justzjj ...

2007-09-01T23:59:59.000Z

215

Acoustic Survey of a 3/8-Scale Automotive Wind Tunnel  

Science Conference Proceedings (OSTI)

An acoustic survey that consists of insertion loss and flow noise measurements was conducted at key locations around the circuit of a 3/8-scale automotive acoustic wind tunnel. Descriptions of the test, the instrumentation, and the wind tunnel facility ...

Jr Earl R. Booth; Romberg Gary; Hansen Larry; Lutz Ron

1996-10-01T23:59:59.000Z

216

Optimization of Utility-Scale Wind-Hydrogen-Battery Systems: Preprint  

Science Conference Proceedings (OSTI)

Traditional utility-scale wind energy systems are not dispatchable; that is, the utility cannot instantaneously control their power output. Energy storage, which can come in many forms, is needed to add dispatchability to a wind farm. This study investigates two options: batteries and hydrogen.

Fingersh, L. J.

2004-07-01T23:59:59.000Z

217

Numerical calculations of wind flow in a full-scale wind test facility  

DOE Green Energy (OSTI)

Numerical studies on wind flow around the Texas Tech University (TTU) Wind Engineering Research Field Laboratory (WERFL) building were conducted. The main focus of this paper is wind loads on the TTU building in the INEEL proposed Windstorm Simulation Center. The results are presented in the form of distributions of static pressure, dynamic pressure, pressure coefficients, and velocity vectors on the surface and the vicinity of the TTU building.

C.H. Oh; J.M. Lacey

1999-06-20T23:59:59.000Z

218

Multiple-Scale Terrain Forcing of Local Wind Fields  

Science Conference Proceedings (OSTI)

Observations and numerical simulations with a hydrostatic model are used to examine effects of regional and local terrain, synoptic forcing, and stability on the wind fields of an intermountain basin. The study area is centered on the Hanford ...

J. C. Doran; E. D. Skyllingstad

1992-05-01T23:59:59.000Z

219

Technical and Economic Feasibility Study of Utility-Scale Wind...  

NLE Websites -- All DOE Office Websites (Extended Search)

&spv0&st0&srp1&stateKS. vii Table ES-1. Turbine Performance and Economics, Including Job Creation Estimates 5 Annual Cost Savings (year) Payback Period (years) Wind System...

220

Investment Timing and Capacity Choice for Small-Scale Wind Power Under Uncertainty  

E-Print Network (OSTI)

Scott Distributed power generation (New York, Marcel Dekker,the renewable share of power generation. The American Windin small-scale wind power generation, as well as the choice

Fleten, Stein-Erik; Maribu, Karl Magnus

2004-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "large scale wind" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Objective Forecasting of Foehn Winds for a Subgrid-Scale Alpine Valley  

Science Conference Proceedings (OSTI)

Foehn winds often depend on topographical features of a scale that is not sufficiently resolved in numerical models. Consequently, a successful foehn forecast has crucially depended on the experience of bench forecasters. This study provides a ...

Susanne Drechsel; Georg J. Mayr

2008-04-01T23:59:59.000Z

222

First-Order Scaling Law for Potential Vorticity Extraction due to Wind  

Science Conference Proceedings (OSTI)

Surface sources and sinks of potential vorticity (PV) have been examined recently in various publications. These are normally identified as the mechanical and buoyant PV fluxes with the former scaled according to wind stress and the latter from ...

Bruno Deremble; W. K. Dewar

2012-08-01T23:59:59.000Z

223

Economic Development from Gigawatt-Scale Wind Deployment in Wyoming (Presentation)  

DOE Green Energy (OSTI)

This presentation provides an overview of economic development in Wyoming from gigawatt-scale wind development and includes a discussion of project context, definitions and caveats, a deployment scenario, modeling inputs, results, and conclusions.

Lantz, E.

2011-05-23T23:59:59.000Z

224

A root cause localization model for large scale systems  

Science Conference Proceedings (OSTI)

Root cause localization, the process of identifying the source of problems in a system using purely external observations, is a significant challenge in many large-scale systems. In this paper, we propose an abstract model that captures the common issues ...

Emre Kiciman; Lakshminarayanan Subramanian

2005-06-01T23:59:59.000Z

225

Predictive discrete latent factor models for large scale dyadic data  

Science Conference Proceedings (OSTI)

We propose a novel statistical method to predict large scale dyadic response variables in the presence of covariate information. Our approach simultaneously incorporates the effect of covariates and estimates local structure that is induced by interactions ... Keywords: co-clustering, dyadic data, generalized linear regression, latent factor modeling

Deepak Agarwal; Srujana Merugu

2007-08-01T23:59:59.000Z

226

Chukwa: a system for reliable large-scale log collection  

Science Conference Proceedings (OSTI)

Large Internet services companies like Google, Yahoo, and Facebook use the MapReduce programming model to process log data. MapReduce is designed to work on data stored in a distributed filesystem like Hadoop's HDFS. As a result, a number of log collection ... Keywords: logging, research, scale

Ariel Rabkin; Randy Katz

2010-11-01T23:59:59.000Z

227

Believability in simplifications of large scale physically based simulation  

Science Conference Proceedings (OSTI)

We verify two hypotheses which are assumed to be true only intuitively in many rigid body simulations. I: In large scale rigid body simulation, viewers may not be able to perceive distortion incurred by an approximated simulation method. II: ... Keywords: 3D graphics and realism, animation, physically based simulation

Donghui Han; Shu-wei Hsu; Ann McNamara; John Keyser

2013-08-01T23:59:59.000Z

228

In Situ Visualization for Large-Scale Combustion Simulations  

Science Conference Proceedings (OSTI)

As scientific supercomputing moves toward petascale and exascale levels, in situ visualization stands out as a scalable way for scientists to view the data their simulations generate. This full picture is crucial particularly for capturing and understanding ... Keywords: in situ visualization, large-scale simulation, parallel rendering, supercomputing, scalability, computer graphics, graphics and multimedia

Hongfeng Yu; Chaoli Wang; Ray W. Grout; Jacqueline H. Chen; Kwan-Liu Ma

2010-05-01T23:59:59.000Z

229

A steady-state L-mode tokamak fusion reactor : large scale and minimum scale.  

E-Print Network (OSTI)

??We perform extensive analysis on the physics of L-mode tokamak fusion reactors to identify (1) a favorable parameter space for a large scale steady-state reactor… (more)

Reed, Mark W. (Mark Wilbert)

2010-01-01T23:59:59.000Z

230

The Effects of Mesoscale Ocean–Atmosphere Coupling on the Large-Scale Ocean Circulation  

Science Conference Proceedings (OSTI)

Small-scale variation in wind stress due to ocean–atmosphere interaction within the atmospheric boundary layer alters the temporal and spatial scale of Ekman pumping driving the double-gyre circulation of the ocean. A high-resolution ...

Andrew Mc C. Hogg; William K. Dewar; Pavel Berloff; Sergey Kravtsov; David K. Hutchinson

2009-08-01T23:59:59.000Z

231

Linearly scaling 3D fragment method for large-scale electronic structure calculations  

Science Conference Proceedings (OSTI)

We present a new linearly scaling three-dimensional fragment (LS3DF) method for large scale ab initio electronic structure calculations. LS3DF is based on a divide-and-conquer approach, which incorporates a novel patching scheme that effectively ...

Lin-Wang Wang; Byounghak Lee; Hongzhang Shan; Zhengji Zhao; Juan Meza; Erich Strohmaier; David H. Bailey

2008-11-01T23:59:59.000Z

232

A steady-state L-mode tokamak fusion reactor : large scale and minimum scale  

E-Print Network (OSTI)

We perform extensive analysis on the physics of L-mode tokamak fusion reactors to identify (1) a favorable parameter space for a large scale steady-state reactor and (2) an operating point for a minimum scale steady-state ...

Reed, Mark W. (Mark Wilbert)

2010-01-01T23:59:59.000Z

233

Final Technical Report Laramie County Community College: Utility-Scale Wind Energy Technology  

SciTech Connect

The Utility-Scale Wind Energy Technology U.S. Department of Energy (DOE) grant EE0000538, provided a way ahead for Laramie County Community College (LCCC) to increase educational and training opportunities for students seeking an Associate of Applied Science (AAS) or Associate of Science (AS) degree in Wind Energy Technology. The DOE grant enabled LCCC to program, schedule, and successfully operate multiple wind energy technology cohorts of up to 20-14 students per cohort simultaneously. As of this report, LCCC currently runs four cohorts. In addition, the DOE grant allowed LCCC to procure specialized LABVOLT electronic equipment that directly supports is wind energy technology curriculum.

Douglas P. Cook

2012-05-22T23:59:59.000Z

234

The Large Scale Biosphere-Atmosphere Experiment in Amazonia (LBA)  

NLE Websites -- All DOE Office Websites (Extended Search)

LBA (Amazon) LBA (Amazon) The Large Scale Biosphere-Atmosphere Experiment in Amazonia (LBA) Overview [LBA Logo] The Large-Scale Biosphere-Atmosphere Experiment in Amazonia (LBA) is an international research initiative conducted from 1995-2005 and led by Brazil. The LBA Project encompasses several scientific disciplines, or components. The LBA-ECO component focuses on the question: "How do tropical forest conversion, regrowth, and selective logging influence carbon storage, nutrient dynamics, trace gas fluxes, and the prospect for sustainable land use in Amazonia?" The Amazon rain forest or Amazonia, is the largest remaining expanse of tropical rain forest on Earth, harboring approximately one-third of all Earth's species. Although the rain forest's area is so large that it

235

Effects of Net Metering on the Use of Small-Scale Wind Systems in the United States  

DOE Green Energy (OSTI)

Factors such as technological advancements, steadily decreasing costs, consumer demand, and state and federal policies are combining to make wind energy the world's fastest growing energy source. State and federal policies are facilitating the growth of the domestic, large-scale wind power market; however, small-scale wind projects (those with a capacity of less than 100 kilowatts[kW]) still face challenges in many states. Net metering, also referred to as net billing, is one particular policy that states are implementing to encourage the use of small renewable energy systems. Net metering allows individual, grid-tied customers who generate electricity using a small renewable energy system to receive credit from their utility for any excess power they generate beyond what they consume. Under most state rules, residential, commercial, and industrial customers are eligible for net metering; however, some states restrict eligibility to particular customer classes. This paper illustrates how net metering programs in certain states vary considerably in terms of how customers are credited for excess power they generate; the type and size of eligible technologies and whether the utility; the state, or some other entity administers the program. This paper focuses on10 particular states where net metering policies are in place. It analyzes how the different versions of these programs affect the use of small-scale wind technologies and whether some versions are more favorable to this technology than others. The choice of citizens in some states to net meter with photovoltaics is also examined.

Forsyth, T. L.; Pedden, M.; Gagliano, T.

2002-11-01T23:59:59.000Z

236

Full-scale wind turbine rotor aerodynamics research  

DOE Green Energy (OSTI)

The United States Department of Energy and the National Renewable Energy Laboratory (NREL) are conducting research to improve wind turbine technology at the NREL National Wind Technology Center (NWTC). One program, the Combined Experiment, has focused on making measurements needed to understand aerodynamic and structural responses of horizontal-axis wind turbines (HAWT). A new phase of this program, the Unsteady Aerodynamics Experiment, will focus on quantifying unsteady aerodynamic phenomena prevalent in stall-controlled HAWTs. Optimally twisted blades and innovative instrumentation and data acquisition systems will be used in these tests. Data can now be acquired and viewed interactively during turbine operations. This paper describes the NREL Unsteady Aerodynamics Experiment and highlights planned future research activities.

Simms, D A; Butterfield, C P

1994-11-01T23:59:59.000Z

237

Large Scale Deployment of Renewables for Electricity Generation  

E-Print Network (OSTI)

-cellulose material. Anaerobic digestion or gasification of biomass produces gas that can be used in similar applications to natural gas. Small-scale biogas production is now a well-established technology and large-scale application is in the advanced stages... of development. The possibility of using biogas in fuel cells exists, but there are a number of technical difficulties that remain to be overcome in this area. Source: www.britishbiogen.co.uk and WEA (2000). 5 All figures refer to electricity.Where necessary...

Neuhoff, Karsten

2006-03-14T23:59:59.000Z

238

Wind tunnel test of 1/30 scale heliostat field array model. Test report  

DOE Green Energy (OSTI)

From 9 January through 20 January 1978, Honeywell conducted a wind tunnel test on a 1/30 scale partial heliostat field. The heliostats were per Honeywell's design developed under the 10 megawatt central receiver pilot electrical power plant subsystem research experiment contract. Likewise, the scaled section of the field geometry duplicated the proposed circular layout. Testing was conducted at the Georgia Institute of Technology's 9 foot subsonic tunnel. The objective of the test was to ascertain from a qualitative standpoint the field effects upon wind loading within a heliostat field. To accomplish this, numerous pressure tap measurements at different heights and at different field positions were taken with varying wind speeds, fence designs, and heliostat gimbal orientations. The Department of Energy specified boundary layer profile was also scaled by 1/30 in order to simulate the total wind effects as accurately as possible taking into account the potentially severe scaling or Reynolds number effects at a 1/30 scale. After initial model set-up within the tunnel and scaled boundary layer generated, 91 separate runs were accomplished. The results do demonstrate the high sensitivity of wind loading upon the collector field due to the actual heliostat orientation and fence geometry. Vertical pressure gradients within the model field and flow reentry angles provide a good qualitative feel as to the full scale environment that might be expected and point to the need for specific additional testing to further explore potentially dangerous conditions.

Brown, G. L.

1978-02-22T23:59:59.000Z

239

Observations and Scale Analysis of Coastal Wind Jets  

Science Conference Proceedings (OSTI)

Blocking of onshore flow by coastal mountains was observed south of Vancouver Island, British Columbia, by the NOAA P-3 aircraft on 1 December 1993. Winds increased from 10 m s?1 offshore to 15 m s?1 nearshore and became more parallel to shore in ...

James E. Overland; Nicholas A. Bond

1995-10-01T23:59:59.000Z

240

Fetch Relations for Wind-Generated Waves as a Function of Wind-Stress Scaling  

Science Conference Proceedings (OSTI)

We present the variation that results when fetch relations for wind-generated wave spectra are sealed by the friction velocity component in the dominant wave direction rather than the magnitude of the friction velocity, using the data collected ...

Will Perrie; Bechara Toulany

1990-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "large scale wind" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Large-Scale Renewable Energy Development on Public Lands  

NLE Websites -- All DOE Office Websites (Extended Search)

Large-Scale Renewable Energy Large-Scale Renewable Energy Development on Public Lands Boyan Kovacic boyan.kovacic@ee.doe.gov 5/2/12 2 | FEDERAL ENERGY MANAGEMENT PROGRAM femp.energy.gov * BLM RE Drivers * BLM RE Programs * BLM Permitting and Revenues * Case Studies * Withdrawn Military Land Outline 3 | FEDERAL ENERGY MANAGEMENT PROGRAM femp.energy.gov BLM: Bureau of Land Management BO: Biological Opinion CSP: Concentrating Solar Power DOE: Department of Energy DOI: Department of Interior EA: Environmental Assessment EIS: Environmental Impact Statement FONSI: Finding of No Significant Impact FS: U.S. Forrest Service IM: Instruction Memorandum MPDS: Maximum Potential Development Scenario NEPA: National Environmental Policy Act NOI: Notice of Intent NOP: Notice to Proceed

242

Large-Scale Renewable Energy Development on Public Lands  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Large-Scale Renewable Energy Large-Scale Renewable Energy Development on Public Lands Boyan Kovacic boyan.kovacic@ee.doe.gov 5/2/12 2 | FEDERAL ENERGY MANAGEMENT PROGRAM femp.energy.gov * BLM RE Drivers * BLM RE Programs * BLM Permitting and Revenues * Case Studies * Withdrawn Military Land Outline 3 | FEDERAL ENERGY MANAGEMENT PROGRAM femp.energy.gov BLM: Bureau of Land Management BO: Biological Opinion CSP: Concentrating Solar Power DOE: Department of Energy DOI: Department of Interior EA: Environmental Assessment EIS: Environmental Impact Statement FONSI: Finding of No Significant Impact FS: U.S. Forrest Service IM: Instruction Memorandum MPDS: Maximum Potential Development Scenario NEPA: National Environmental Policy Act NOI: Notice of Intent NOP: Notice to Proceed

243

Developing Renewable Energy Projects Larger Than 10 MWs at Federal Facilities (Book), Large-Scale Renewable Energy Guide, Federal Energy Management Program (FEMP)  

NLE Websites -- All DOE Office Websites (Extended Search)

LARGE-SCALE RENEWABLE ENERGY GUIDE LARGE-SCALE RENEWABLE ENERGY GUIDE Developing Renewable Energy Projects Larger Than 10 MWs at Federal Facilities A Practical Guide to Getting Large-Scale Renewable Energy Projects Financed with Private Capital Cover photos, clockwise from the top: Installing mirrored parabolic trough collectors - (January 19, 2012) Crews work around the clock installing mirrored parabolic trough collectors, built on site, that will cover 3 square miles at Abengoa's Solana Plant. Solana a 280 megawatt utility scale solar power plant (CSP) under construction in Gila Bend, Arizona, USA. When finished it will generate 280 MW 's of clean, sustainable power serving over 70,000 Arizona homes. Photo by Dennis Schroeder, NREL 20097 Dry Lake Wind Power Project in Arizona; Suzlon S88 wind turbines - The 63-MW Dry Lake Wind Power Project in Arizona is the first

244

Developing Renewable Energy Projects Larger Than 10 MWs at Federal Facilities (Book), Large-Scale Renewable Energy Guide, Federal Energy Management Program (FEMP)  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

LARGE-SCALE RENEWABLE ENERGY GUIDE LARGE-SCALE RENEWABLE ENERGY GUIDE Developing Renewable Energy Projects Larger Than 10 MWs at Federal Facilities A Practical Guide to Getting Large-Scale Renewable Energy Projects Financed with Private Capital Cover photos, clockwise from the top: Installing mirrored parabolic trough collectors - (January 19, 2012) Crews work around the clock installing mirrored parabolic trough collectors, built on site, that will cover 3 square miles at Abengoa's Solana Plant. Solana a 280 megawatt utility scale solar power plant (CSP) under construction in Gila Bend, Arizona, USA. When finished it will generate 280 MW 's of clean, sustainable power serving over 70,000 Arizona homes. Photo by Dennis Schroeder, NREL 20097 Dry Lake Wind Power Project in Arizona; Suzlon S88 wind turbines - The 63-MW Dry Lake Wind Power Project in Arizona is the first

245

New England Wind Forum: New England Wind Projects  

Wind Powering America (EERE)

Projects in New England Building Wind Energy in New England Wind Resource Wind Power Technology Economics Markets Siting Policy Technical Challenges Issues Small Wind Large Wind Newsletter Perspectives Events Quick Links to States CT MA ME NH RI VT Bookmark and Share New England Wind Projects This page shows the location of installed and planned New England wind projects. Find windfarms, community-scale wind projects, customer-sited wind projects, small wind projects, and offshore wind projects. Read more information about how to use the Google Map and how to add your wind project to the map. Text version New England Wind Energy Projects Connecticut, East Canaan Wind Connecticut, Klug Farm Connecticut, Phoenix Press Connecticut, Wind Colebrook (South and North)

246

WindPACT Turbine Design Scaling Studies: Technical Area 4 -- Balance-of-Station Cost  

SciTech Connect

DOE's Wind Partnerships for Advanced Component Technologies (WindPACT) program explores the most advanced wind-generating technologies for improving reliability and decreasing energy costs. The first step in the WindPact program is a scaling study to bound the optimum sizes for wind turbines, to define size limits for certain technologies, and to scale new technologies. The program is divided into four projects: Composite Blades for 80-120-meter Rotors; Turbine, Rotor, and Blade Logistics; Self-Erecting Tower and Nacelle Feasibility; and Balance-of-Station Cost. This report discusses balance-of-station costs, which includes the electrical power collector system, wind turbine foundations, communications and controls, meteorological equipment, access roadways, crane pads, and the maintenance building. The report is based on a conceptual 50-megawatt (MW) wind farm site near Mission, South Dakota. Cost comparisons are provided for four sizes of wind turbines: 750 kilowatt (kW), 2.5 MW, 5.0 MW, and 10.0 MW.

Shafer, D. A.; Strawmyer, K. R.; Conley, R. M.; Guidinger J. H.; Wilkie, D. C.; Zellman, T. F.

2001-07-24T23:59:59.000Z

247

Parallel I/O Software Infrastructure for Large-Scale Systems  

NLE Websites -- All DOE Office Websites (Extended Search)

Parallel IO Software Infrastructure for Large-Scale Systems Parallel IO Software Infrastructure for Large-Scale Systems | Tags: Math & Computer Science Choudhary.png An...

248

Fluidic: Grid-Scale Batteries for Wind and Solar | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Fluidic: Grid-Scale Batteries for Wind and Solar Fluidic: Grid-Scale Batteries for Wind and Solar Fluidic: Grid-Scale Batteries for Wind and Solar February 27, 2013 - 5:42pm Addthis Andrew Gumbiner Contractor, Advanced Research Projects Agency-Energy. FLUIDIC: Metal Air Recharged from DOE ARPA-E on Vimeo. Our nation's modern electric grid is limited in its ability to store excess energy for on-demand power. As a result, electricity must be generated on a constant basis to perfectly match demand. Grid-scale storage technologies have the potential to shift this dynamic, revolutionizing how our grid uses and distributes energy. Reliable, high-performing storage technologies could provide a considerable amount of power on very short demand, lowering costs to utilities and consumers alike. These powerful technologies would enable renewable sources of energy -

249

Nuclear-pumped lasers for large-scale applications  

SciTech Connect

Efficient initiation of large-volume chemical lasers may be achieved by neutron induced reactions which produce charged particles in the final state. When a burst mode nuclear reactor is used as the neutron source, both a sufficiently intense neutron flux and a sufficiently short initiation pulse may be possible. Proof-of-principle experiments are planned to demonstrate lasing in a direct nuclear-pumped large-volume system; to study the effects of various neutron absorbing materials on laser performance; to study the effects of long initiation pulse lengths; to demonstrate the performance of large-scale optics and the beam quality that may be obtained; and to assess the performance of alternative designs of burst systems that increase the neutron output and burst repetition rate. 21 refs., 8 figs., 5 tabs.

Anderson, R.E.; Leonard, E.M.; Shea, R.F.; Berggren, R.R.

1989-05-01T23:59:59.000Z

250

Optimal site selection and sizing of distributed utility-scale wind power plants  

DOE Green Energy (OSTI)

As electric market product unbundling occurs, sellers in the wholesale market for electricity will find it to their advantage to be able to specify the quantity of electricity available and the time of availability. Since wind power plants are driven by the stochastic nature of the wind itself, this can present difficulties. To the extent that an accurate wind forecast is available, contract deviations, and therefore penalties, can be significantly reduced. Even though one might have the ability to accurately forecast the availability of wind power, it might not be available during enough of the peak period to provide sufficient value. However, if the wind power plant is developed over geographically disperse locations, the timing and availability of wind power from these multiple sources could provide a better match with the utility`s peak load than a single site. There are several wind plants in various stages of planning or development in the US. Although some of these are small-scale demonstration projects, significant wind capacity has been developed in Minnesota, with additional developments planned in Wyoming and Iowa. As these and other projects are planned and developed, there is a need to perform analysis of the value of geographically diverse sites on the efficiency of the overall wind plant. In this paper, the authors use hourly wind-speed data from six geographically diverse sites to provide some insight into the potential benefits of disperse wind plant development. They provide hourly wind power from each of these sites to an electric reliability simulation model. This model uses generating plant characteristics of the generators within the state of Minnesota to calculate various reliability indices. Since they lack data on wholesale power transactions, they do not include them in the analysis, and they reduce the hourly load data accordingly. The authors present and compare results of their methods and suggest some areas of future research.

Milligan, M.R. [National Renewable Energy Lab., Golden, CO (United States)] [National Renewable Energy Lab., Golden, CO (United States); Artig, R. [Minnesota Dept. of Public Service, St. Paul, MN (United States)] [Minnesota Dept. of Public Service, St. Paul, MN (United States)

1998-04-01T23:59:59.000Z

251

Investment Timing and Capacity Choice for Small-Scale Wind PowerUnder Uncertainty  

DOE Green Energy (OSTI)

This paper presents a method for evaluation of investments in small-scale wind power under uncertainty. It is assumed that the price of electricity is uncertain and that an owner of a property with wind resources has a deferrable opportunity to invest in one wind power turbine within a capacity range. The model evaluates investment in a set of projects with different capacity. It is assumed that the owner substitutes own electricity load with electricity from the wind mill and sells excess electricity back to the grid on an hourly basis. The problem for the owner is to find the price levels at which it is optimal to invest, and in which capacity to invest. The results suggests it is optimal to wait for significantly higher prices than the net present value break-even. Optimal scale and timing depend on the expected price growth rate and the uncertainty in the future prices.

Fleten, Stein-Erik; Maribu, Karl Magnus

2004-11-28T23:59:59.000Z

252

Wind Characteristics in Southern Wyoming  

Science Conference Proceedings (OSTI)

Measurements of wind from a network of surface anemometers and a 107 m tower have been analyzed for southern Wyoming where a project for large-scale generation of electricity from wind power is underway. Topographically forced channeling of ...

Brooks E. Martner; John D. Marwitz

1982-12-01T23:59:59.000Z

253

Best Practices and Tools for Large-scale Deployment of Renewable Energy and  

Open Energy Info (EERE)

Best Practices and Tools for Large-scale Deployment of Renewable Energy and Best Practices and Tools for Large-scale Deployment of Renewable Energy and Energy Efficiency Techniques Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Best Practices and Tools for Large-scale Deployment of Renewable Energy and Energy Efficiency Techniques in ESCWA Agency/Company /Organization: United Nations Economic and Social Commission for Western Asia Focus Area: Energy Efficiency, Renewable Energy, Solar, Wind Topics: Implementation, Policies/deployment programs, Background analysis Resource Type: Lessons learned/best practices Website: www.escwa.un.org/information/publications/edit/upload/sdpd-09-TP3.pdf Country: Bahrain, Egypt, Iraq, Jordan, Kuwait, Lebanon, Oman, Qatar, Saudi Arabia, Sudan, Syria, United Arab Emirates, Yemen UN Region: "Western Asia & North Africa" is not in the list of possible values (Eastern Africa, Middle Africa, Northern Africa, Southern Africa, Western Africa, Caribbean, Central America, South America, Northern America, Central Asia, Eastern Asia, Southern Asia, South-Eastern Asia, Western Asia, Eastern Europe, Northern Europe, Southern Europe, Western Europe, Australia and New Zealand, Melanesia, Micronesia, Polynesia, Latin America and the Caribbean) for this property.

254

Atypical Behavior Identification in Large Scale Network Traffic  

SciTech Connect

Cyber analysts are faced with the daunting challenge of identifying exploits and threats within potentially billions of daily records of network traffic. Enterprise-wide cyber traffic involves hundreds of millions of distinct IP addresses and results in data sets ranging from terabytes to petabytes of raw data. Creating behavioral models and identifying trends based on those models requires data intensive architectures and techniques that can scale as data volume increases. Analysts need scalable visualization methods that foster interactive exploration of data and enable identification of behavioral anomalies. Developers must carefully consider application design, storage, processing, and display to provide usability and interactivity with large-scale data. We present an application that highlights atypical behavior in enterprise network flow records. This is accomplished by utilizing data intensive architectures to store the data, aggregation techniques to optimize data access, statistical techniques to characterize behavior, and a visual analytic environment to render the behavioral trends, highlight atypical activity, and allow for exploration.

Best, Daniel M.; Hafen, Ryan P.; Olsen, Bryan K.; Pike, William A.

2011-10-23T23:59:59.000Z

255

WindPACT Turbine Design Scaling Studies Technical Area 2: Turbine, Rotor and Blade Logistics  

SciTech Connect

Through the National Renewable Energy Laboratory (NREL), the United States Department of Energy (DOE) implemented the Wind Partnership for Advanced Component Technologies (WindPACT) program. This program will explore advanced technologies that may reduce the cost of energy (COE) from wind turbines. The initial step in the WindPACT program is a series of preliminary scaling studies intended to determine the optimum sizes for future turbines, help define sizing limits for certain critical technologies, and explore the potential for advanced technologies to contribute to reduced COE as turbine scales increase. This report documents the results of Technical Area 2-Turbine Rotor and Blade Logistics. For this report, we investigated the transportation, assembly, and crane logistics and costs associated with installation of a range of multi-megawatt-scale wind turbines. We focused on using currently available equipment, assembly techniques, and transportation system capabilities and limitations to hypothetically transport and install 50 wind turbines at a facility in south-central South Dakota.

Smith, K.

2001-07-16T23:59:59.000Z

256

Large-Scale Renewable Energy Producers Property Tax Abatement...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

up to 20 years for real and personal property used to generate electricity from renewable energy resources including solar, wind, biomass*, fuel cells, geothermal or hydro....

257

WuKong: automatically detecting and localizing bugs that manifest at large system scales  

Science Conference Proceedings (OSTI)

A key challenge in developing large scale applications is finding bugs that are latent at the small scales of testing, but manifest themselves when the application is deployed at a large scale. Here, we ascribe a dual meaning to "large scale"---it could ... Keywords: feature reconstruction, program behavior prediction, scale-dependent bug

Bowen Zhou; Jonathan Too; Milind Kulkarni; Saurabh Bagchi

2013-06-01T23:59:59.000Z

258

Solar cycle variations of large scale flows in the Sun  

E-Print Network (OSTI)

Using data from the Michelson Doppler Imager (MDI) instrument on board the Solar and Heliospheric Observatory (SOHO), we study the large-scale velocity fields in the outer part of the solar convection zone using the ring diagram technique. We use observations from four different times to study possible temporal variations in flow velocity. We find definite changes in both the zonal and meridional components of the flows. The amplitude of the zonal flow appears to increase with solar activity and the flow pattern also shifts towards lower latitude with time.

Sarbani Basu; H. M. Antia

2000-01-17T23:59:59.000Z

259

Large-scale sodium spray fire code validation (SOFICOV) test  

Science Conference Proceedings (OSTI)

A large-scale, sodium, spray fire code validation test was performed in the HEDL 850-m/sup 3/ Containment System Test Facility (CSTF) as part of the Sodium Spray Fire Code Validation (SOFICOV) program. Six hundred fifty eight kilograms of sodium spray was sprayed in an air atmosphere for a period of 2400 s. The sodium spray droplet sizes and spray pattern distribution were estimated. The containment atmosphere temperature and pressure response, containment wall temperature response and sodium reaction rate with oxygen were measured. These results are compared to post-test predictions using SPRAY and NACOM computer codes.

Jeppson, D.W.; Muhlestein, L.D.

1985-01-01T23:59:59.000Z

260

Solving Large-scale Eigenvalue Problems in SciDACApplications  

SciTech Connect

Large-scale eigenvalue problems arise in a number of DOE applications. This paper provides an overview of the recent development of eigenvalue computation in the context of two SciDAC applications. We emphasize the importance of Krylov subspace methods, and point out its limitations. We discuss the value of alternative approaches that are more amenable to the use of preconditioners, and report the progression using the multi-level algebraic sub-structuring techniques to speed up eigenvalue calculation. In addition to methods for linear eigenvalue problems, we also examine new approaches to solving two types of non-linear eigenvalue problems arising from SciDAC applications.

Yang, Chao

2005-06-29T23:59:59.000Z

Note: This page contains sample records for the topic "large scale wind" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Large scale obscuration and related climate effects open literature bibliography  

SciTech Connect

Large scale obscuration and related climate effects of nuclear detonations first became a matter of concern in connection with the so-called ``Nuclear Winter Controversy`` in the early 1980`s. Since then, the world has changed. Nevertheless, concern remains about the atmospheric effects of nuclear detonations, but the source of concern has shifted. Now it focuses less on global, and more on regional effects and their resulting impacts on the performance of electro-optical and other defense-related systems. This bibliography reflects the modified interest.

Russell, N.A.; Geitgey, J.; Behl, Y.K.; Zak, B.D.

1994-05-01T23:59:59.000Z

262

Large-Scale Spray Releases: Additional Aerosol Test Results  

SciTech Connect

One of the events postulated in the hazard analysis for the Waste Treatment and Immobilization Plant (WTP) and other U.S. Department of Energy (DOE) nuclear facilities is a breach in process piping that produces aerosols with droplet sizes in the respirable range. The current approach for predicting the size and concentration of aerosols produced in a spray leak event involves extrapolating from correlations reported in the literature. These correlations are based on results obtained from small engineered spray nozzles using pure liquids that behave as a Newtonian fluid. The narrow ranges of physical properties on which the correlations are based do not cover the wide range of slurries and viscous materials that will be processed in the WTP and in processing facilities across the DOE complex. To expand the data set upon which the WTP accident and safety analyses were based, an aerosol spray leak testing program was conducted by Pacific Northwest National Laboratory (PNNL). PNNL’s test program addressed two key technical areas to improve the WTP methodology (Larson and Allen 2010). The first technical area was to quantify the role of slurry particles in small breaches where slurry particles may plug the hole and prevent high-pressure sprays. The results from an effort to address this first technical area can be found in Mahoney et al. (2012a). The second technical area was to determine aerosol droplet size distribution and total droplet volume from prototypic breaches and fluids, including sprays from larger breaches and sprays of slurries for which literature data are mostly absent. To address the second technical area, the testing program collected aerosol generation data at two scales, commonly referred to as small-scale and large-scale testing. The small-scale testing and resultant data are described in Mahoney et al. (2012b), and the large-scale testing and resultant data are presented in Schonewill et al. (2012). In tests at both scales, simulants were used to mimic the relevant physical properties projected for actual WTP process streams.

Daniel, Richard C.; Gauglitz, Phillip A.; Burns, Carolyn A.; Fountain, Matthew S.; Shimskey, Rick W.; Billing, Justin M.; Bontha, Jagannadha R.; Kurath, Dean E.; Jenks, Jeromy WJ; MacFarlan, Paul J.; Mahoney, Lenna A.

2013-08-01T23:59:59.000Z

263

Planning under uncertainty solving large-scale stochastic linear programs  

Science Conference Proceedings (OSTI)

For many practical problems, solutions obtained from deterministic models are unsatisfactory because they fail to hedge against certain contingencies that may occur in the future. Stochastic models address this shortcoming, but up to recently seemed to be intractable due to their size. Recent advances both in solution algorithms and in computer technology now allow us to solve important and general classes of practical stochastic problems. We show how large-scale stochastic linear programs can be efficiently solved by combining classical decomposition and Monte Carlo (importance) sampling techniques. We discuss the methodology for solving two-stage stochastic linear programs with recourse, present numerical results of large problems with numerous stochastic parameters, show how to efficiently implement the methodology on a parallel multi-computer and derive the theory for solving a general class of multi-stage problems with dependency of the stochastic parameters within a stage and between different stages.

Infanger, G. (Stanford Univ., CA (United States). Dept. of Operations Research Technische Univ., Vienna (Austria). Inst. fuer Energiewirtschaft)

1992-12-01T23:59:59.000Z

264

Large Scale Computing and Storage Requirements for Fusion Energy Sciences Research  

E-Print Network (OSTI)

strategic plans. Large  Scale  Computing  and  Storage  Requirements  for  Fusion  Energy  Sciences   DOE  

Gerber, Richard

2012-01-01T23:59:59.000Z

265

Meso-? Scale Perturbations of the Wind Field by Thunderstorm Cells  

Science Conference Proceedings (OSTI)

Analysis of data from the high density storm-scale rawinsonde network of SESAME during the storm events on 2 May 1979 showed the existence of persistent and strong regions of tropospheric convergence and divergence which were detectable on the ...

Stan L. Ulanski; Gerald M. Heymsfield

1986-04-01T23:59:59.000Z

266

Analysis of the Technical and Economic Potential for Mid-Scale Distributed Wind: December 2007 - October 31, 2008  

DOE Green Energy (OSTI)

This report examines the status, restrainers, drivers, and estimated development potential of mid-scale (10 kW - 5000 kW) distributed wind energy projects.

Kwartin, R.; Wolfrum, A.; Granfield, K.; Kagel, A.; Appleton, A.

2008-12-01T23:59:59.000Z

267

A Climatology of Tropical Anvil and Its Relationship to the Large-Scale Circulation  

E-Print Network (OSTI)

This dissertation uses multiple tools to investigate tropical anvil, i.e., thick, non-precipitating cloud associated with deep convection with the main objectives to provide a climatology of tropics-wide anvil properties and a better understanding of anvil formation, and to provide a more realistic assessment of the radiative impact of tropical anvil on the large-scale circulation. Based on 10 years (1998-2007) of observations, anvil observed by the Tropical Rainfall Measuring Mission (TRMM) Precipitation (PR) shows significant geographical variations, which can be linked to variations in the parent convection. Strong upper level wind shear appears to assist the generation of anvil and may further explain the different anvil statistics over land and ocean. Variations in the large-scale environment appear to play a more important role in anvil production in regions where convection regularly attains heights greater than 7 km. For regions where convection is less deep, variations in the depth of the convection and the large-scale environment likely contribute more equally to anvil generation. Anvil radiative heating profiles are estimated by extrapolating millimeter cloud radar (MMCR) radiative properties from Manus to the 10-year TRMM PR record. When the unconditional anvil areal coverage is taken into account, the anvil radiative heating becomes quite weak, increasing the PR latent heating profile by less than 1 percent at mid and upper levels. Stratiform rain and cirrus radiative heating contributions increase the upper level latent heating by 12 percent. This tropical radiative heating only slightly enhances the latent heating driven model response throughout the tropics, but more significantly over the East Pacific. These modest circulation changes suggest that previous studies may have overemphasized the importance of radiative heating in terms of Walker and Hadley circulation variations. Further, the relationship of cloud radiative heating to latent heating needs to be taken into account for more realistic studies of cloud radiative forcing on the large-scale circulation.

Li, Wei

2009-12-01T23:59:59.000Z

268

Theoretical and experimental power from large horizontal-axis wind turbines  

SciTech Connect

A method for calculating the output power from large horizontal-axis wind turbines is presented. Modifications to the airfoil characteristics and the momentum portion of classical blade element-momentum theory are given that improve correlation with measured data. Improvement is particularly evident at low tip speed ratios where aerodynamic stall can occur as the blade experiences high angles of attack. Output power calculated using the modified theory is compared with measured data for several large wind turbines. These wind turbines range in size from the DOE/NASA 100 kW Mod-O (38 m rotor diameter) to the 2000 kW Mod-1 (61 m rotor diameter). The calculated results are in good agreement with measured data from these machines.

Viterna, L A; Janetzke, D C

1982-09-01T23:59:59.000Z

269

INVESTIGATION OF INTERMITTENCY IN MAGNETOHYDRODYNAMICS AND SOLAR WIND TURBULENCE: SCALE-DEPENDENT KURTOSIS  

SciTech Connect

The behavior of scale-dependent (or filtered) kurtosis is studied in the solar wind using magnetic field measurements from the ACE and Cluster spacecraft at 1 AU. It is also analyzed numerically with high-resolution magnetohydrodynamic spectral simulations. In each case the filtered kurtosis increases with wavenumber, implying the presence of coherent structures at the smallest scales. This phase coupling is related to intermittency in solar wind turbulence and the emergence of non-Gaussian statistics. However, it is inhibited by the presence of upstream waves and other phase-randomizing structures, which act to reduce the growth of kurtosis.

Wan Minping; Osman, Kareem T.; Matthaeus, William H. [Bartol Research Institute and Department of Physics and Astronomy, University of Delaware, Newark, DE 19716 (United States); Oughton, Sean, E-mail: mpwan@bartol.udel.edu [Department of Mathematics, University of Waikato, Hamilton 3240 (New Zealand)

2012-01-10T23:59:59.000Z

270

Exploring Cloud Computing for Large-scale Scientific Applications  

Science Conference Proceedings (OSTI)

This paper explores cloud computing for large-scale data-intensive scientific applications. Cloud computing is attractive because it provides hardware and software resources on-demand, which relieves the burden of acquiring and maintaining a huge amount of resources that may be used only once by a scientific application. However, unlike typical commercial applications that often just requires a moderate amount of ordinary resources, large-scale scientific applications often need to process enormous amount of data in the terabyte or even petabyte range and require special high performance hardware with low latency connections to complete computation in a reasonable amount of time. To address these challenges, we build an infrastructure that can dynamically select high performance computing hardware across institutions and dynamically adapt the computation to the selected resources to achieve high performance. We have also demonstrated the effectiveness of our infrastructure by building a system biology application and an uncertainty quantification application for carbon sequestration, which can efficiently utilize data and computation resources across several institutions.

Lin, Guang; Han, Binh; Yin, Jian; Gorton, Ian

2013-06-27T23:59:59.000Z

271

Parallel Index and Query for Large Scale Data Analysis  

SciTech Connect

Modern scientific datasets present numerous data management and analysis challenges. State-of-the-art index and query technologies are critical for facilitating interactive exploration of large datasets, but numerous challenges remain in terms of designing a system for process- ing general scientific datasets. The system needs to be able to run on distributed multi-core platforms, efficiently utilize underlying I/O infrastructure, and scale to massive datasets. We present FastQuery, a novel software framework that address these challenges. FastQuery utilizes a state-of-the-art index and query technology (FastBit) and is designed to process mas- sive datasets on modern supercomputing platforms. We apply FastQuery to processing of a massive 50TB dataset generated by a large scale accelerator modeling code. We demonstrate the scalability of the tool to 11,520 cores. Motivated by the scientific need to search for inter- esting particles in this dataset, we use our framework to reduce search time from hours to tens of seconds.

Chou, Jerry; Wu, Kesheng; Ruebel, Oliver; Howison, Mark; Qiang, Ji; Prabhat,; Austin, Brian; Bethel, E. Wes; Ryne, Rob D.; Shoshani, Arie

2011-07-18T23:59:59.000Z

272

Large Scale GSHP as Alternative Energy for American Farmers Geothermal  

Open Energy Info (EERE)

GSHP as Alternative Energy for American Farmers Geothermal GSHP as Alternative Energy for American Farmers Geothermal Project Jump to: navigation, search Last modified on July 22, 2011. Project Title Large Scale GSHP as Alternative Energy for American Farmers Project Type / Topic 1 Recovery Act - Geothermal Technologies Program: Ground Source Heat Pumps Project Type / Topic 2 Topic Area 1: Technology Demonstration Projects Project Description We propose a large scale demonstration of solar assisted GSHP systems on two poultry farms in mid-Missouri. The heating load of Farm A with 4 barns will be 510 tons and Farm B with 5 barns will be 440 tons. Solar assisted GSHP systems will be installed, and new utility business model will be applied to both farms. Farm A will be constructed with commercial products in order to bring immediate impact to the industry. Farm B will also have a thermal energy storage system installed, and improved solar collectors will be used. A comprehensive energy analysis and economic study will be conducted.

273

A method for the assessment of the visual impact caused by the large-scale deployment of renewable-energy facilities  

Science Conference Proceedings (OSTI)

The production of energy from renewable sources requires a significantly larger use of the territory compared with conventional (fossil and nuclear) sources. For large penetrations of renewable technologies, such as wind power, the overall visual impact at the national level can be substantial, and may prompt public reaction. This study develops a methodology for the assessment of the visual impact that can be used to measure and report the level of impact caused by several renewable technologies (wind farms, solar photovoltaic plants or solar thermal ones), both at the local and regional (e.g. national) scales. Applications are shown to several large-scale, hypothetical scenarios of wind and solar-energy penetration in Spain, and also to the vicinity of an actual, single wind farm.

Rodrigues, Marcos; Montanes, Carlos [Fluid Mechanics Group, University of Zaragoza, Maria de Luna 3, 50018, Zaragoza (Spain); Fueyo, Norberto, E-mail: Norberto.Fueyo@unizar.e [Fluid Mechanics Group, University of Zaragoza, Maria de Luna 3, 50018, Zaragoza (Spain)

2010-07-15T23:59:59.000Z

274

The use of real-time off-site observations as a methodology for increasing forecast skill in prediction of large wind power ramps one or more hours ahead of their impact on a wind plant.  

SciTech Connect

ABSTRACT Application of Real-Time Offsite Measurements in Improved Short-Term Wind Ramp Prediction Skill Improved forecasting performance immediately preceding wind ramp events is of preeminent concern to most wind energy companies, system operators, and balancing authorities. The value of near real-time hub height-level wind data and more general meteorological measurements to short-term wind power forecasting is well understood. For some sites, access to onsite measured wind data - even historical - can reduce forecast error in the short-range to medium-range horizons by as much as 50%. Unfortunately, valuable free-stream wind measurements at tall tower are not typically available at most wind plants, thereby forcing wind forecasters to rely upon wind measurements below hub height and/or turbine nacelle anemometry. Free-stream measurements can be appropriately scaled to hub-height levels, using existing empirically-derived relationships that account for surface roughness and turbulence. But there is large uncertainty in these relationships for a given time of day and state of the boundary layer. Alternatively, forecasts can rely entirely on turbine anemometry measurements, though such measurements are themselves subject to wake effects that are not stationary. The void in free-stream hub-height level measurements of wind can be filled by remote sensing (e.g., sodar, lidar, and radar). However, the expense of such equipment may not be sustainable. There is a growing market for traditional anemometry on tall tower networks, maintained by third parties to the forecasting process (i.e., independent of forecasters and the forecast users). This study examines the value of offsite tall-tower data from the WINDataNOW Technology network for short-horizon wind power predictions at a wind farm in northern Montana. The presentation shall describe successful physical and statistical techniques for its application and the practicality of its application in an operational setting. It shall be demonstrated that when used properly, the real-time offsite measurements materially improve wind ramp capture and prediction statistics, when compared to traditional wind forecasting techniques and to a simple persistence model.

Martin Wilde, Principal Investigator

2012-12-31T23:59:59.000Z

275

Fully coupled dynamic analysis of a floating wind turbine system  

E-Print Network (OSTI)

The use of wind power is in a period of rapid growth worldwide and wind energy systems have emerged as a promising technology for utilizing offshore wind resources for the large scale generation of electricity. Drawing ...

Withee, Jon E

2004-01-01T23:59:59.000Z

276

DeWind GmbH | Open Energy Information  

Open Energy Info (EERE)

GmbH Place Lubeck, Germany Zip D - 23569 Sector Wind energy Product Germany-based large scale wind turbine manufacturer. References DeWind GmbH1 LinkedIn Connections CrunchBase...

277

Wind Power: How Much, How Soon, and At What Cost?  

E-Print Network (OSTI)

Evaluation of Global Wind Power." Journal of Geophysical2008. "The Economics of Wind Power with Energy Storage."Economics of Large-Scale Wind Power in a Carbon Constrained

Wiser, Ryan H

2010-01-01T23:59:59.000Z

278

Wind speed forecasting at different time scales: a non parametric approach  

E-Print Network (OSTI)

The prediction of wind speed is one of the most important aspects when dealing with renewable energy. In this paper we show a new nonparametric model, based on semi-Markov chains, to predict wind speed. Particularly we use an indexed semi-Markov model, that reproduces accurately the statistical behavior of wind speed, to forecast wind speed one step ahead for different time scales and for very long time horizon maintaining the goodness of prediction. In order to check the main features of the model we show, as indicator of goodness, the root mean square error between real data and predicted ones and we compare our forecasting results with those of a persistence model.

D'Amico, Guglielmo; Prattico, Flavio

2013-01-01T23:59:59.000Z

279

Small-scale anisotropy and intermittency in high and low-latitude solar wind  

E-Print Network (OSTI)

We analyze low and high--latitude fast solar wind data from the Ulysses spacecraft from 1992 to 1994 using a a systematic method to analyse the anisotropic content of the magnetic field fluctuations. We investigate all available frequencies, 1-10^{-6} Hz, for both high and low--latitudes datasets and are able to quantify the relative importance of the anisotropic versus the isotropic fluctuations. We analyse, up to sixth order, longitudinal, transverse and mixed magnetic field correlations. Our results show that strongly intermittent and anisotropic events are present in the solar wind plasma at high frequencies/small scales, indicating the absence of a complete recovery of isotropy. Anisotropic scaling properties are compatible for high and low--latitude data, suggesting a universal behaviour in spite of the different rate of evolution of the fast solar wind streams in the two environments.

A. Bigazzi; L. Biferale; S. M. A. Gama; M. Velli

2004-12-14T23:59:59.000Z

280

Small-scale anisotropy and intermittency in high and low-latitude solar wind  

E-Print Network (OSTI)

We analyze low and high--latitude fast solar wind data from the Ulysses spacecraft from 1992 to 1994 using a a systematic method to analyse the anisotropic content of the magnetic field fluctuations. We investigate all available frequencies, 1-10^{-6} Hz, for both high and low--latitudes datasets and are able to quantify the relative importance of the anisotropic versus the isotropic fluctuations. We analyse, up to sixth order, longitudinal, transverse and mixed magnetic field correlations. Our results show that strongly intermittent and anisotropic events are present in the solar wind plasma at high frequencies/small scales, indicating the absence of a complete recovery of isotropy. Anisotropic scaling properties are compatible for high and low--latitude data, suggesting a universal behaviour in spite of the different rate of evolution of the fast solar wind streams in the two environments.

Bigazzi, A; Gama, S M A; Velli, M

2004-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "large scale wind" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Exploiting multi-scale parallelism for large scale numerical modelling of laser wakefield accelerators  

E-Print Network (OSTI)

A new generation of laser wakefield accelerators, supported by the extreme accelerating fields generated in the interaction of PW-Class lasers and underdense targets, promises the production of high quality electron beams in short distances for multiple applications. Achieving this goal will rely heavily on numerical modeling for further understanding of the underlying physics and identification of optimal regimes, but large scale modeling of these scenarios is computationally heavy and requires efficient use of state-of-the-art Petascale supercomputing systems. We discuss the main difficulties involved in running these simulations and the new developments implemented in the OSIRIS framework to address these issues, ranging from multi-dimensional dynamic load balancing and hybrid distributed / shared memory parallelism to the vectorization of the PIC algorithm. We present the results of the OASCR Joule Metric program on the issue of large scale modeling of LWFA, demonstrating speedups of over 1 order of magni...

Fonseca, Ricardo A; Fiúza, Frederico; Davidson, Asher; Tsung, Frank S; Mori, Warren B; Silva, Luís O

2013-01-01T23:59:59.000Z

282

Structure of Large-Scale Convective Anomalies over Tropical Oceans  

Science Conference Proceedings (OSTI)

Geographical variations in the variance and cross-correlation of monthly mean sea surface temperature (SST), outgoing longwave radiation (OLR, a proxy for deep convection and vertical motion), and convergence of winds at the surface and at 850 mb ...

David S. Gutzler; Tamara M. Wood

1990-04-01T23:59:59.000Z

283

Large Scale Geothermal Exchange System for Residential, Office and Retail  

Open Energy Info (EERE)

Geothermal Exchange System for Residential, Office and Retail Geothermal Exchange System for Residential, Office and Retail Development Geothermal Project Jump to: navigation, search Last modified on July 22, 2011. Project Title Large Scale Geothermal Exchange System for Residential, Office and Retail Development Project Type / Topic 1 Recovery Act - Geothermal Technologies Program: Ground Source Heat Pumps Project Type / Topic 2 Topic Area 1: Technology Demonstration Projects Project Description RiverHeath will be a new neighborhood, with residences, shops, restaurants, and offices. The design incorporates walking trails, community gardens, green roofs, and innovative stormwater controls. A major component of the project is our reliance on renewable energy. One legacy of the land's industrial past is an onsite hydro-electric facility which formerly powered the paper factories. The onsite hydro is being refurbished and will furnish 100% of the project's electricity demand.

284

Breakthrough Large-Scale Industrial Project Begins Carbon Capture and  

NLE Websites -- All DOE Office Websites (Extended Search)

28, 2013 28, 2013 Breakthrough Large-Scale Industrial Project Begins Carbon Capture and Utilization DOE-Supported Project in Texas Demonstrates Viability of CCUS Technology Washington, D.C. - A breakthrough carbon capture, utilization, and storage (CCUS) project in Texas has begun capturing carbon dioxide (CO2) and piping it to an oilfield for use in enhanced oil recovery (EOR). MORE INFO Read the project factsheet The project at Air Products and Chemicals hydrogen production facility in Port Arthur, Texas, is significant for demonstrating both the effectiveness and commercial viability of CCUS technology as an option in helping mitigate atmospheric CO2 emissions. Funded in part through the American Recovery and Reinvestment Act (ARRA), the project is managed by the U.S.

285

Large-Scale Analyses of Glycosylation in Cellulases  

NLE Websites -- All DOE Office Websites (Extended Search)

Article Article Large-Scale Analyses of Glycosylation in Cellulases Fengfeng Zhou 1,2 , Victor Olman 1,2 , and Ying Xu 1,2 * 1 Computational Systems Biology Laboratory, Department of Biochemistry and Molecular Biology / Institute of Bioinformatics, University of Georgia, Athens, GA 30602-7229, USA; 2 BioEnergy Science Center, Oak Ridge National Laboratory, Oak Ridge, TN 37830-8050, USA. *Corresponding author. E-mail: xyn@bmb.uga.edu DOI: 10.1016/S1672-0229(08)60049-2 Cellulases are important glycosyl hydrolases (GHs) that hydrolyze cellulose poly- mers into smaller oligosaccharides by breaking the cellulose β (1→4) bonds, and they are widely used to produce cellulosic ethanol from the plant biomass. N-linked and O-linked glycosylations were proposed to impact the catalytic ef f iciency, cel- lulose binding af f inity and the stability of cellulases based on observations

286

Cosmological Simulations for Large-Scale Sky Surveys | Argonne Leadership  

NLE Websites -- All DOE Office Websites (Extended Search)

Instantaneous velocity magnitude in a flow through an open valve in a valve/piston assembly. Instantaneous velocity magnitude in a flow through an open valve in a valve/piston assembly. Instantaneous velocity magnitude in a flow through an open valve in a valve/piston assembly. Christos Altantzis, MIT, and Martin Schmitt, LAV. All the images were generated from their work at LAV. Cosmological Simulations for Large-Scale Sky Surveys PI Name: Christos Frouzakis PI Email: frouzakis@lav.mavt.ethz.ch Institution: Swiss Federal Institute of Technology Zurich Allocation Program: INCITE Allocation Hours at ALCF: 100 Million Year: 2014 Research Domain: Chemistry The combustion of coal and petroleum-based fuels supply most of the energy needed to meet the world's transportation and power generation demands. To address the anticipated petroleum shortage, along with increasing energy

287

A New Scalable Directory Architecture for Large-Scale Multiprocessors  

E-Print Network (OSTI)

The memory overhead introduced by directories constitutes a major hurdle in the scalability of cc-NUMA architectures, which makes the shared-memory paradigm unfeasible for very large-scale systems. This work is focused on improving the scalability of shared-memory multiprocessors by significantly reducing the size of the directory. We propose multilayer clustering as an effective approach to reduce the directory-entry width. Detailed evaluation for 64 processors shows that using this approach we can drastically reduce the memory overhead, while suffering a performance degradation very similar to previous compressed schemes (such as Coarse Vector). In addition, a novel two-level directory architecture is proposed in order to eliminate the penalty caused by these compressed directories. This organization consists of a small Full-Map firstlevel directory (which provides precise information for the most recently referenced lines) and a compressed secondlevel directory (which provides in-ex...

Manuel E. Acacio; José González; José M. García; José Duato

2001-01-01T23:59:59.000Z

288

CONSTRAINING PRIMORDIAL MAGNETIC FIELDS THROUGH LARGE-SCALE STRUCTURE  

Science Conference Proceedings (OSTI)

We study primordial magnetic field effects on the matter perturbations in the universe. We assume magnetic field generation prior to the big bang nucleosynthesis (BBN), i.e., during the radiation-dominated epoch of the universe expansion, but do not limit analysis by considering a particular magnetogenesis scenario. Contrary to previous studies, we limit the total magnetic field energy density and not the smoothed amplitude of the magnetic field at large (of the order of 1 Mpc) scales. We review several cosmological signatures, such as halo abundance, thermal Sunyaev-Zel'dovich effect, and Ly{alpha} data. For a cross-check, we compare our limits with that obtained through the cosmic microwave background faraday rotation effect and BBN. The limits range between 1.5 nG and 4.5 nG for n{sub B} in (- 3; -1.5).

Kahniashvili, Tina; Natarajan, Aravind; Battaglia, Nicholas [McWilliams Center for Cosmology and Department of Physics, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, PA 15213 (United States); Maravin, Yurii [Department of Physics, Kansas State University, 116 Cardwell Hall, Manhattan, KS 66506 (United States); Tevzadze, Alexander G., E-mail: tinatin@andrew.cmu.edu [Faculty of Exact and Natural Sciences, Javakhishvili Tbilisi State University, 3 Chavchavadze Avenue, Tbilisi 0128 (Georgia)

2013-06-10T23:59:59.000Z

289

Lightweight computational steering of very large scale molecular dynamics simulations  

Science Conference Proceedings (OSTI)

We present a computational steering approach for controlling, analyzing, and visualizing very large scale molecular dynamics simulations involving tens to hundreds of millions of atoms. Our approach relies on extensible scripting languages and an easy to use tool for building extensions and modules. The system is extremely easy to modify, works with existing C code, is memory efficient, and can be used from inexpensive workstations and networks. We demonstrate how we have used this system to manipulate data from production MD simulations involving as many as 104 million atoms running on the CM-5 and Cray T3D. We also show how this approach can be used to build systems that integrate common scripting languages (including Tcl/Tk, Perl, and Python), simulation code, user extensions, and commercial data analysis packages.

Beazley, D.M. [Univ. of Utah, Salt Lake City, UT (United States). Dept. of Computer Science; Lomdahl, P.S. [Los Alamos National Lab., NM (United States)

1996-09-01T23:59:59.000Z

290

Grid infrastructure to support science portals for large scale instruments.  

SciTech Connect

Soon, a new generation of scientific workbenches will be developed as a collaborative effort among various research institutions in the US. These scientific workbenches will be accessed in the Web via portals. Reusable components are needed to build such portals for different scientific disciplines, allowing uniform desktop access to remote resources. Such components will include tools and services enabling easy collaboration, job submission, job monitoring, component discovery, and persistent object storage. Based on experience gained from Grand Challenge applications for large-scale instruments, we demonstrate how Grid infrastructure components can be used to support the implementation of science portals. The availability of these components will simplify the prototype implementation of a common portal architecture.

von Laszewski, G.; Foster, I.

1999-09-29T23:59:59.000Z

291

Unified architecture for large-scale attested metering  

E-Print Network (OSTI)

We introduce a secure architecture called an attested meter for advanced metering that supports large-scale deployments, flexible configurations, and enhanced protection for consumer privacy and metering integrity. Our study starts with a threat analysis for advanced metering networks and formulates protection requirements for those threats. The attested meter satisfies these through a unified set of system interfaces based on virtual machines and attestation for the software agents of various parties that use the meter. We argue that this combination provides a well-adapted architecture for advanced metering and we take a step towards demonstrating its feasibility with a prototype implementation based on the Trusted Platform Module (TPM) and Xen Virtual Machine Monitor (VMM). This is the first effort use virtual machines and attestation in an advanced meter. 1.

Michael Lemay; George Gross; Carl A. Gunter; Sanjam Garg

2007-01-01T23:59:59.000Z

292

Modeling The Large Scale Bias of Neutral Hydrogen  

E-Print Network (OSTI)

We present analytical estimates of the large scale bias of neutral Hydrogen (HI) based on the Halo Occupation Distribution formalism. We use a simple, non-parametric model which monotonically relates the total mass of a halo with its HI mass at zero redshift; for earlier times we assume limiting models for the HI density parameter evolution, consistent with the data presently available, as well as two main scenarios for the evolution of our HI mass - Halo mass relation. We find that both the linear and the first non-linear bias terms exhibit a remarkable evolution with redshift, regardless of the specific limiting model assumed for the HI evolution. These analytical predictions are then shown to be consistent with measurements performed on the Millennium Simulation. Additionally, we show that this strong bias evolution does not sensibly affect the measurement of the HI Power Spectrum.

Marin, Felipe; Seo, Hee-Jong; Vallinotto, Alberto

2009-01-01T23:59:59.000Z

293

Hydrogen-combustion analyses of large-scale tests  

DOE Green Energy (OSTI)

This report uses results of the large-scale tests with turbulence performed by the Electric Power Research Institute at the Nevada Test Site to evaluate hydrogen burn-analysis procedures based on lumped-parameter codes like COMPARE-H2 and associated burn-parameter models. The test results: (1) confirmed, in a general way, the procedures for application to pulsed burning, (2) increased significantly our understanding of the burn phenomenon by demonstrating that continuous burning can occur, and (3) indicated that steam can terminate continuous burning. Future actions recommended include: (1) modification of the code to perform continuous-burn analyses, which is demonstrated, (2) analyses to determine the type of burning (pulsed or continuous) that will exist in nuclear containments and the stable location if the burning is continuous, and (3) changes to the models for estimating burn parameters.

Gido, R.G.; Koestel, A.

1986-01-01T23:59:59.000Z

294

ESS 2012 Peer Review - Nitrogen-Oxygen Battery for Large Scale Energy Storage - Frank Delnick, SNL  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

US DOE Energy Storage Systems Research Program US DOE Energy Storage Systems Research Program Peer Review, Washington, DC Sept. 26-28, 2012 Frank Delnick, David Ingersoll, Karen Waldrip, Peter Feibelman Nitrogen/Oxygen Battery A Transformational Architecture for Large Scale Energy Storage Power Sources Technology Group Sandia National Laboratories Albuquerque, NM SAND2012-7881P N 2 /O 2 Battery Project Overview  Air/Air battery.  N 2 electrochemistry enables the redefinition of a gas (diffusion) electrode and the three phase interface.  Operated as redox flow battery.  Provide a very high energy density, very low cost, environmentally benign electrochemical platform for load leveling and for grid-integrated storage of energy generated by wind, solar and other sustainable but intermittent sources.

295

Improving Performance of Power Systems with Large-scale Variable Generation Additions  

Science Conference Proceedings (OSTI)

A power system with large-scale renewable resources, like wind and solar generation, creates significant challenges to system control performance and reliability characteristics because of intermittency and uncertainties associated with variable generation. It is important to quantify these uncertainties, and then incorporate this information into decision-making processes and power system operations. This paper presents three approaches to evaluate the flexibility needed from conventional generators and other resources in the presence of variable generation as well as provide this flexibility from a non-traditional resource – wide area energy storage system. These approaches provide operators with much-needed information on the likelihood and magnitude of ramping and capacity problems, and the ability to dispatch available resources in response to such problems.

Makarov, Yuri V.; Etingov, Pavel V.; Samaan, Nader A.; Lu, Ning; Ma, Jian; Subbarao, Krishnappa; Du, Pengwei; Kannberg, Landis D.

2012-07-22T23:59:59.000Z

296

Advanced coal gasifier designs using large-scale simulations  

Science Conference Proceedings (OSTI)

Porting of the legacy code MFIX to a high performance computer (HPC) and the use of high resolution simulations for the design of a coal gasifier are described here. MFIX is based on a continuum multiphase flow model that considers gas and solids to form interpenetrating continua. Low resolution simulations of a commercial scale gasifier with a validated MFIX model revealed interesting physical phenomena with implications on the gasifier design, which prompted the study reported here. To be predictive, the simulations need to model the spatiotemporal variations in gas and solids volume fractions, velocities, temperatures with any associated phase change and chemical reactions. These processes occur at various time- and length-scales requiring very high spatial resolution and large number of iterations with small time-steps. We were able to perform perhaps the largest known simulations of gas-solids reacting flows, providing detailed information about the gas-solids flow structure and the pressure, temperature and species distribution in the gasifier. One key finding is the new features of the coal jet trajectory revealed with the high spatial resolution, which provides information on the accuracy of the lower resolution simulations. Methodologies for effectively combining high and low resolution simulations for design studies must be developed. From a computational science perspective, we found that global communication has to be reduced to achieve scalability to 1000s of cores, hybrid parallelization is required to effectively utilize the multicore chips, and the wait time in the batch queue significantly increases the actual time-to-solution. From our experience, development is required in the following areas: efficient solvers for heterogeneous, massively parallel systems; data analysis tools to extract information from large data sets; and programming environments for easily porting legacy codes to HPC.

Syamlal, M [National Energy Technology Laboratory (NETL); Guenther, Chris [National Energy Technology Laboratory (NETL); Gel, Aytekin [Aeolus Research Inc.; Pannala, Sreekanth [ORNL

2009-01-01T23:59:59.000Z

297

Training a Large Scale Classifier with the Quantum Adiabatic Algorithm  

E-Print Network (OSTI)

In a previous publication we proposed discrete global optimization as a method to train a strong binary classifier constructed as a thresholded sum over weak classifiers. Our motivation was to cast the training of a classifier into a format amenable to solution by the quantum adiabatic algorithm. Applying adiabatic quantum computing (AQC) promises to yield solutions that are superior to those which can be achieved with classical heuristic solvers. Interestingly we found that by using heuristic solvers to obtain approximate solutions we could already gain an advantage over the standard method AdaBoost. In this communication we generalize the baseline method to large scale classifier training. By large scale we mean that either the cardinality of the dictionary of candidate weak classifiers or the number of weak learners used in the strong classifier exceed the number of variables that can be handled effectively in a single global optimization. For such situations we propose an iterative and piecewise approach in which a subset of weak classifiers is selected in each iteration via global optimization. The strong classifier is then constructed by concatenating the subsets of weak classifiers. We show in numerical studies that the generalized method again successfully competes with AdaBoost. We also provide theoretical arguments as to why the proposed optimization method, which does not only minimize the empirical loss but also adds L0-norm regularization, is superior to versions of boosting that only minimize the empirical loss. By conducting a Quantum Monte Carlo simulation we gather evidence that the quantum adiabatic algorithm is able to handle a generic training problem efficiently.

Hartmut Neven; Vasil S. Denchev; Geordie Rose; William G. Macready

2009-12-04T23:59:59.000Z

298

A LARGE-SCALE SHOCK SURROUNDING A POWERFUL RADIO GALAXY?  

Science Conference Proceedings (OSTI)

We report Chandra evidence for a 200 kpc scale shock in the cluster surrounding the powerful radio galaxy 3C 444. Our 20 ks observation allows us to identify a clear surface brightness drop around the outer edge of the radio galaxy, which is likely to correspond to a spheroidal shock propagating into the intracluster medium. We measure a temperature jump across this drop of a factor {approx}1.7, which corresponds to a Mach number of {approx}1.7. This is likely to be an underestimate due to the need to average over fairly large regions. We also detect clear cavities corresponding to the positions of the radio lobes, which is only the second such detection associated with an FRII radio galaxy. We estimate that the total energy transferred to the environment is >8.2 x 10{sup 60} erg, corresponding to a jet power >2.9 x 10{sup 45} erg s{sup -1}. Our results suggest that energy input from FRII radio galaxies is likely to exceed substantially estimates based on cluster cavity scaling relations.

Croston, J. H. [School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ (United Kingdom); Hardcastle, M. J.; Mingo, B. [School of Physics, Astronomy and Mathematics, University of Hertfordshire, Hatfield, Hertfordshire, AL10 9AB (United Kingdom); Evans, D. A. [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Dicken, D. [Department of Physics and Astronomy, Rochester Institute of Technology, 84 Lomb Memorial Drive, Rochester, NY 14623 (United States); Morganti, R. [Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA, Dwingeloo (Netherlands); Tadhunter, C. N., E-mail: J.Croston@soton.ac.uk [Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH (United Kingdom)

2011-06-20T23:59:59.000Z

299

Large-Angular-Scale Anisotropy in the Cosmic Background Radiation  

DOE R&D Accomplishments (OSTI)

We report the results of an extended series of airborne measurements of large-angular-scale anisotropy in the 3 K cosmic background radiation. Observations were carried out with a dual-antenna microwave radiometer operating at 33 GHz (.089 cm wavelength) flown on board a U-2 aircraft to 20 km altitude. In eleven flights, between December 1976 and May 1978, the radiometer measured differential intensity between pairs of directions distributed over most of the northern hemisphere with an rms sensitivity of 47 mK Hz{sup 1?}. The measurements how clear evidence of anisotropy that is readily interpreted as due to the solar motion relative to the sources of the radiation. The anisotropy is well fit by a first order spherical harmonic of amplitude 360{+ or -}50km sec{sup -1} toward the direction 11.2{+ or -}0.5 hours of right ascension and 19 {+ or -}8 degrees declination. A simultaneous fit to a combined hypotheses of dipole and quadrupole angular distributions places a 1 mK limit on the amplitude of most components of quadrupole anisotropy with 90% confidence. Additional analysis places a 0.5 mK limit on uncorrelated fluctuations (sky-roughness) in the 3 K background on an angular scale of the antenna beam width, about 7 degrees.

Gorenstein, M. V.; Smoot, G. F.

1980-05-00T23:59:59.000Z

300

Synoptic-Scale Structure and the Character of Coastally Trapped Wind Reversals  

Science Conference Proceedings (OSTI)

Coastally trapped wind reversals that occur along the U.S. West Coast have been described in numerous other studies. The synoptic-scale environment and the forcing of a coastally trapped Kelvin wave are highly linked in the development of these ...

Wendell A. Nuss

2007-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "large scale wind" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

The Cost of Transmission for Wind Energy: A Review of Transmission Planning Studies  

E-Print Network (OSTI)

and R. H. Socolow. 2007. Baseload wind energy: modeling theand S. Zhang.1998. Large-scale baseload wind power in China.

Mills, Andrew D.

2009-01-01T23:59:59.000Z

302

Ferroelectric opening switches for large-scale pulsed power drivers.  

DOE Green Energy (OSTI)

Fast electrical energy storage or Voltage-Driven Technology (VDT) has dominated fast, high-voltage pulsed power systems for the past six decades. Fast magnetic energy storage or Current-Driven Technology (CDT) is characterized by 10,000 X higher energy density than VDT and has a great number of other substantial advantages, but it has all but been neglected for all of these decades. The uniform explanation for neglect of CDT technology is invariably that the industry has never been able to make an effective opening switch, which is essential for the use of CDT. Most approaches to opening switches have involved plasma of one sort or another. On a large scale, gaseous plasmas have been used as a conductor to bridge the switch electrodes that provides an opening function when the current wave front propagates through to the output end of the plasma and fully magnetizes the plasma - this is called a Plasma Opening Switch (POS). Opening can be triggered in a POS using a magnetic field to push the plasma out of the A-K gap - this is called a Magnetically Controlled Plasma Opening Switch (MCPOS). On a small scale, depletion of electron plasmas in semiconductor devices is used to affect opening switch behavior, but these devices are relatively low voltage and low current compared to the hundreds of kilo-volts and tens of kilo-amperes of interest to pulsed power. This work is an investigation into an entirely new approach to opening switch technology that utilizes new materials in new ways. The new materials are Ferroelectrics and using them as an opening switch is a stark contrast to their traditional applications in optics and transducer applications. Emphasis is on use of high performance ferroelectrics with the objective of developing an opening switch that would be suitable for large scale pulsed power applications. Over the course of exploring this new ground, we have discovered new behaviors and properties of these materials that were here to fore unknown. Some of these unexpected discoveries have lead to new research directions to address challenges.

Brennecka, Geoffrey L.; Rudys, Joseph Matthew; Reed, Kim Warren; Pena, Gary Edward; Tuttle, Bruce Andrew; Glover, Steven Frank

2009-11-01T23:59:59.000Z

303

Safety aspects of large-scale combustion of hydrogen  

DOE Green Energy (OSTI)

Recent hydrogen-safety investigations have studied the possible large-scale effects from phenomena such as the accumulation of combustible hydrogen-air mixtures in large, confined volumes. Of particular interest are safe methods for the disposal of the hydrogen and the pressures which can arise from its confined combustion. Consequently, tests of the confined combustion of hydrogen-air mixtures were conducted in a 2100 m/sup 3/ volume. These tests show that continuous combustion, as the hydrogen is generated, is a safe method for its disposal. It also has been seen that, for hydrogen concentrations up to 13 vol %, it is possible to predict maximum pressures that can occur upon ignition of premixed hydrogen-air atmospheres. In addition information has been obtained concerning the survivability of the equipment that is needed to recover from an accident involving hydrogen combustion. An accident that involved the inadvertent mixing of hydrogen and oxygen gases in a tube trailer gave evidence that under the proper conditions hydrogen combustion can transit to a detonation. If detonation occurs the pressures which can be experienced are much higher although short in duration.

Edeskuty, F.J.; Haugh, J.J.; Thompson, R.T.

1986-01-01T23:59:59.000Z

304

Planning and implementing a large-scale polymer flood  

Science Conference Proceedings (OSTI)

The motive for the Eliasville polymerflood originated while planning a waterflood in this light oil, limestone reservoir. Adverse reservoir waterflood characteristics were identified prior to unitization and laboratory work was undertaken to demonstrate the benefits of reducing water mobility by increasing water vicosity with several different polyacrylamides. Computer simulations incorporating polymer properties from laboratory work and known Caddo waterflood performance were used to design the polymerflood. Three injection tests were conducted to determine polymer injectivity. Pressure transient tests were used to measure the in-situ polymer viscosity. One of the injection tests included an off-pattern producing well which permitted an estimation of polymer retention and incremental oil recovery in a short time. Based on the injection tests and simulation work a large scale polymer project was implemented. The optimum slug size required 30,000,000 lb of emulsion polymer. Facilities used to mix and feed this large amount of polymer are described. A low-shear polymer flow control method was developed to insure maximum fluid viscosity at the formation perforations. Product specifications were verified prior to accepting delivery and injection fluid quality was monitored in laboratories constructed for the project. Early production response to field wide polymer injection is comparable to that observed at the off-pattern producing well during the injection test. While the early field response is encouraging, the effects of salt water injection on slug integrity and increased pattern size on oil recovery are still to be determined.

Weiss, W.W.; Baldwin, R.W.

1984-04-01T23:59:59.000Z

305

Large-Scale Data Challenges in Future Power Grids  

Science Conference Proceedings (OSTI)

This paper describes technical challenges in supporting large-scale real-time data analysis for future power grid systems and discusses various design options to address these challenges. Even though the existing U.S. power grid has served the nation remarkably well over the last 120 years, big changes are in the horizon. The widespread deployment of renewable generation, smart grid controls, energy storage, plug-in hybrids, and new conducting materials will require fundamental changes in the operational concepts and principal components. The whole system becomes highly dynamic and needs constant adjustments based on real time data. Even though millions of sensors such as phase measurement units (PMUs) and smart meters are being widely deployed, a data layer that can support this amount of data in real time is needed. Unlike the data fabric in cloud services, the data layer for smart grids must address some unique challenges. This layer must be scalable to support millions of sensors and a large number of diverse applications and still provide real time guarantees. Moreover, the system needs to be highly reliable and highly secure because the power grid is a critical piece of infrastructure. No existing systems can satisfy all the requirements at the same time. We examine various design options. In particular, we explore the special characteristics of power grid data to meet both scalability and quality of service requirements. Our initial prototype can improve performance by orders of magnitude over existing general-purpose systems. The prototype was demonstrated with several use cases from PNNL’s FPGI and was shown to be able to integrate huge amount of data from a large number of sensors and a diverse set of applications.

Yin, Jian; Sharma, Poorva; Gorton, Ian; Akyol, Bora A.

2013-03-25T23:59:59.000Z

306

NREL's Wind R&D Success Stories, National Wind Technology Center (NWTC) (Fact Sheet)  

DOE Green Energy (OSTI)

Wind energy research, development, and deployment have reduced the cost of large and small wind turbine technologies, increased wind energy system reliability and operability, lowered risk by validating performance and design, increased the understanding of the true impacts of wind energy on the U.S. electrical infrastructure, and expanded wind energy markets. A synopsis of research conducted on utility-scale wind turbines, small wind turbines, software, components, market development and grid integration are detailed.

Not Available

2010-01-01T23:59:59.000Z

307

PROPERTIES IMPORTANT TO MIXING FOR WTP LARGE SCALE INTEGRATED TESTING  

Science Conference Proceedings (OSTI)

Large Scale Integrated Testing (LSIT) is being planned by Bechtel National, Inc. to address uncertainties in the full scale mixing performance of the Hanford Waste Treatment and Immobilization Plant (WTP). Testing will use simulated waste rather than actual Hanford waste. Therefore, the use of suitable simulants is critical to achieving the goals of the test program. External review boards have raised questions regarding the overall representativeness of simulants used in previous mixing tests. Accordingly, WTP requested the Savannah River National Laboratory (SRNL) to assist with development of simulants for use in LSIT. Among the first tasks assigned to SRNL was to develop a list of waste properties that matter to pulse-jet mixer (PJM) mixing of WTP tanks. This report satisfies Commitment 5.2.3.1 of the Department of Energy Implementation Plan for Defense Nuclear Facilities Safety Board Recommendation 2010-2: physical properties important to mixing and scaling. In support of waste simulant development, the following two objectives are the focus of this report: (1) Assess physical and chemical properties important to the testing and development of mixing scaling relationships; (2) Identify the governing properties and associated ranges for LSIT to achieve the Newtonian and non-Newtonian test objectives. This includes the properties to support testing of sampling and heel management systems. The test objectives for LSIT relate to transfer and pump out of solid particles, prototypic integrated operations, sparger operation, PJM controllability, vessel level/density measurement accuracy, sampling, heel management, PJM restart, design and safety margin, Computational Fluid Dynamics (CFD) Verification and Validation (V and V) and comparison, performance testing and scaling, and high temperature operation. The slurry properties that are most important to Performance Testing and Scaling depend on the test objective and rheological classification of the slurry (i.e., Newtonian or non-Newtonian). The most important properties for testing with Newtonian slurries are the Archimedes number distribution and the particle concentration. For some test objectives, the shear strength is important. In the testing to collect data for CFD V and V and CFD comparison, the liquid density and liquid viscosity are important. In the high temperature testing, the liquid density and liquid viscosity are important. The Archimedes number distribution combines effects of particle size distribution, solid-liquid density difference, and kinematic viscosity. The most important properties for testing with non-Newtonian slurries are the slurry yield stress, the slurry consistency, and the shear strength. The solid-liquid density difference and the particle size are also important. It is also important to match multiple properties within the same simulant to achieve behavior representative of the waste. Other properties such as particle shape, concentration, surface charge, and size distribution breadth, as well as slurry cohesiveness and adhesiveness, liquid pH and ionic strength also influence the simulant properties either directly or through other physical properties such as yield stress.

Koopman, D.; Martino, C.; Poirier, M.

2012-04-26T23:59:59.000Z

308

Large-Scale Spray Releases: Initial Aerosol Test Results  

Science Conference Proceedings (OSTI)

One of the events postulated in the hazard analysis at the Waste Treatment and Immobilization Plant (WTP) and other U.S. Department of Energy (DOE) nuclear facilities is a breach in process piping that produces aerosols with droplet sizes in the respirable range. The current approach for predicting the size and concentration of aerosols produced in a spray leak involves extrapolating from correlations reported in the literature. These correlations are based on results obtained from small engineered spray nozzles using pure liquids with Newtonian fluid behavior. The narrow ranges of physical properties on which the correlations are based do not cover the wide range of slurries and viscous materials that will be processed in the WTP and across processing facilities in the DOE complex. Two key technical areas were identified where testing results were needed to improve the technical basis by reducing the uncertainty due to extrapolating existing literature results. The first technical need was to quantify the role of slurry particles in small breaches where the slurry particles may plug and result in substantially reduced, or even negligible, respirable fraction formed by high-pressure sprays. The second technical need was to determine the aerosol droplet size distribution and volume from prototypic breaches and fluids, specifically including sprays from larger breaches with slurries where data from the literature are scarce. To address these technical areas, small- and large-scale test stands were constructed and operated with simulants to determine aerosol release fractions and generation rates from a range of breach sizes and geometries. The properties of the simulants represented the range of properties expected in the WTP process streams and included water, sodium salt solutions, slurries containing boehmite or gibbsite, and a hazardous chemical simulant. The effect of anti-foam agents was assessed with most of the simulants. Orifices included round holes and rectangular slots. The round holes ranged in size from 0.2 to 4.46 mm. The slots ranged from (width × length) 0.3 × 5 to 2.74 × 76.2 mm. Most slots were oriented longitudinally along the pipe, but some were oriented circumferentially. In addition, a limited number of multi-hole test pieces were tested in an attempt to assess the impact of a more complex breach. Much of the testing was conducted at pressures of 200 and 380 psi, but some tests were conducted at 100 psi. Testing the largest postulated breaches was deemed impractical because of the large size of some of the WTP equipment. The purpose of this report is to present the experimental results and analyses for the aerosol measurements obtained in the large-scale test stand. The report includes a description of the simulants used and their properties, equipment and operations, data analysis methodology, and test results. The results of tests investigating the role of slurry particles in plugging of small breaches are reported in Mahoney et al. 2012a. The results of the aerosol measurements in the small-scale test stand are reported in Mahoney et al. (2012b).

Schonewill, Philip P.; Gauglitz, Phillip A.; Bontha, Jagannadha R.; Daniel, Richard C.; Kurath, Dean E.; Adkins, Harold E.; Billing, Justin M.; Burns, Carolyn A.; Davis, James M.; Enderlin, Carl W.; Fischer, Christopher M.; Jenks, Jeromy WJ; Lukins, Craig D.; MacFarlan, Paul J.; Shutthanandan, Janani I.; Smith, Dennese M.

2012-12-01T23:59:59.000Z

309

Linearly Scaling 3D Fragment Method for Large-Scale Electronic Structure Calculations  

Science Conference Proceedings (OSTI)

We present a new linearly scaling three-dimensional fragment (LS3DF) method for large scale ab initio electronic structure calculations. LS3DF is based on a divide-and-conquer approach, which incorporates a novel patching scheme that effectively cancels out the artificial boundary effects due to the subdivision of the system. As a consequence, the LS3DF program yields essentially the same results as direct density functional theory (DFT) calculations. The fragments of the LS3DF algorithm can be calculated separately with different groups of processors. This leads to almost perfect parallelization on tens of thousands of processors. After code optimization, we were able to achieve 35.1 Tflop/s, which is 39percent of the theoretical speed on 17,280 Cray XT4 processor cores. Our 13,824-atom ZnTeO alloy calculation runs 400 times faster than a direct DFTcalculation, even presuming that the direct DFT calculation can scale well up to 17,280 processor cores. These results demonstrate the applicability of the LS3DF method to material simulations, the advantage of using linearly scaling algorithms over conventional O(N3) methods, and the potential for petascale computation using the LS3DF method.

Wang, Lin-Wang; Lee, Byounghak; Shan, Hongzhang; Zhao, Zhengji; Meza, Juan; Strohmaier, Erich; Bailey, David H.

2008-07-01T23:59:59.000Z

310

Linear scaling 3D fragment method for large-scale electronic structure calculations  

Science Conference Proceedings (OSTI)

We present a new linearly scaling three-dimensional fragment (LS3DF) method for large scale ab initio electronic structure calculations. LS3DF is based on a divide-and-conquer approach, which incorporates a novel patching scheme that effectively cancels out the artificial boundary effects due to the subdivision of the system. As a consequence, the LS3DF program yields essentially the same results as direct density functional theory (DFT) calculations. The fragments of the LS3DF algorithm can be calculated separately with different groups of processors. This leads to almost perfect parallelization on tens of thousands of processors. After code optimization, we were able to achieve 35.1 Tflop/s, which is 39% of the theoretical speed on 17,280 Cray XT4 processor cores. Our 13,824-atom ZnTeO alloy calculation runs 400 times faster than a direct DFT calculation, even presuming that the direct DFT calculation can scale well up to 17,280 processor cores. These results demonstrate the applicability of the LS3DF method to material simulations, the advantage of using linearly scaling algorithms over conventional O(N{sup 3}) methods, and the potential for petascale computation using the LS3DF method.

Wang, Lin-Wang; Wang, Lin-Wang; Lee, Byounghak; Shan, HongZhang; Zhao, Zhengji; Meza, Juan; Strohmaier, Erich; Bailey, David

2008-07-11T23:59:59.000Z

311

Blade System Design Studies Volume I: Composite Technologies for Large Wind Turbine Blades  

DOE Green Energy (OSTI)

As part of the U.S. Department of Energy's Wind Partnerships for Advanced Component Technologies (WindPACT) program, Global Energy Concepts LLC (GEC) is performing a study concerning innovations in materials, processes and structural configurations for application to wind turbine blades in the multi-megawatt range. The project team for this work includes experts in all areas of wind turbine blade design, analysis, manufacture, and testing. Constraints to cost-effective scaling-up of the current commercial blade designs and manufacturing methods are identified, including self-gravity loads, transportation, and environmental considerations. A trade-off study is performed to evaluate the incremental changes in blade cost, weight, and stiffness for a wide range of composite materials, fabric types, and manufacturing processes. Fiberglass/carbon fiber hybrid blades are identified as having a promising combination of cost, weight, stiffness and fatigue resistance. Vacuum-assisted resin transfer molding, resin film infision, and pre-impregnated materials are identified as having benefits in reduced volatile emissions, higher fiber content, and improved laminate quality relative to the baseline wet lay-up process. Alternative structural designs are identified, including jointed configurations to facilitate transportation. Based on the results to date, recommendations are made for further evaluation and testing under this study to verify the predicted material and structural performance.

GRIFFIN, DAYTON A.; ASHWILL, THOMAS D.

2002-07-01T23:59:59.000Z

312

Blade System Design Studies Volume I: Composite Technologies for Large Wind Turbine Blades  

SciTech Connect

As part of the U.S. Department of Energy's Wind Partnerships for Advanced Component Technologies (WindPACT) program, Global Energy Concepts LLC (GEC) is performing a study concerning innovations in materials, processes and structural configurations for application to wind turbine blades in the multi-megawatt range. The project team for this work includes experts in all areas of wind turbine blade design, analysis, manufacture, and testing. Constraints to cost-effective scaling-up of the current commercial blade designs and manufacturing methods are identified, including self-gravity loads, transportation, and environmental considerations. A trade-off study is performed to evaluate the incremental changes in blade cost, weight, and stiffness for a wide range of composite materials, fabric types, and manufacturing processes. Fiberglass/carbon fiber hybrid blades are identified as having a promising combination of cost, weight, stiffness and fatigue resistance. Vacuum-assisted resin transfer molding, resin film infision, and pre-impregnated materials are identified as having benefits in reduced volatile emissions, higher fiber content, and improved laminate quality relative to the baseline wet lay-up process. Alternative structural designs are identified, including jointed configurations to facilitate transportation. Based on the results to date, recommendations are made for further evaluation and testing under this study to verify the predicted material and structural performance.

GRIFFIN, DAYTON A.; ASHWILL, THOMAS D.

2002-07-01T23:59:59.000Z

313

NIChE Workshop on Materials for Large-Scale Energy ...  

Science Conference Proceedings (OSTI)

... Workshop on Materials for Large-Scale Energy Storage. Purpose: This workshop will delve into the end-use applications and market drivers for large ...

2010-10-05T23:59:59.000Z

314

DOE Awards $126.6 Million for Two More Large-Scale Carbon Sequestratio...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

126.6 Million for Two More Large-Scale Carbon Sequestration Projects DOE Awards 126.6 Million for Two More Large-Scale Carbon Sequestration Projects May 6, 2008 - 11:30am Addthis...

315

Energy Department Awards $66.7 Million for Large-Scale Carbon...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

66.7 Million for Large-Scale Carbon Sequestration Project Energy Department Awards 66.7 Million for Large-Scale Carbon Sequestration Project December 18, 2007 - 4:58pm Addthis...

316

The Distinction between Large-Scale and Mesoscale Contribution to Severe Convection: A Case Study Example  

Science Conference Proceedings (OSTI)

Using a case study of a relatively modest severe weather event as an example, a framework for understanding the large-scale-mesoscale interaction is developed and discussed. Large-scale processes are limited, by definition, to those which are ...

Charles A. Doswell III

1987-03-01T23:59:59.000Z

317

The Oceanic Response to Large-Scale Atmospheric Disturbances  

Science Conference Proceedings (OSTI)

This paper is an analytical and numerical study of the response of the ocean to the fluctuating component of the wind stress as computed from twice-daily weather maps for the period 1973 to 1976. The results are described in terms of (time) mean ...

J. Willebrand; S. G. H. Philander; R. C. Pacanowski

1980-03-01T23:59:59.000Z

318

A New Scalable Directory Architecture for Large-Scale Multiprocessors  

E-Print Network (OSTI)

The memory overhead introduced by directories constitutes a major hurdle in the scalability of cc-NUMA architectures, which makes the shared-memory paradigm unfeasible for very large-scale systems. This work is focused on improving the scalability of shared-memory multiprocessors by significantly reducing the size of the directory. We propose multilayer clustering as an effective approach to reduce the directory-entry width. Detailed evaluation for 64 processors shows that using this approach we can drastically reduce the memory overhead, while suffering a performance degradation very similar to previous compressed schemes (such as Coarse Vector). In addition, a novel two-level directory architecture is proposed in order to eliminate the penalty caused by these compressed directories. This organization consists of a small Full-Map firstlevel directory (which provides precise information for the most recently referenced lines) and a compressed secondlevel directory (which provides in-excess information). Results show that a system with this directory architecture can achieve the same performance as a multiprocessor with a big and non-scalable Full-Map directory, with a very significant reduction of the memory overhead.

Manuel Acacio Jos; José González; José M. García

2001-01-01T23:59:59.000Z

319

LARGE SCALE METHOD FOR THE PRODUCTION AND PURIFICATION OF CURIUM  

DOE Patents (OSTI)

A large-scale process for production and purification of Cm/sup 242/ is described. Aluminum slugs containing Am are irradiated and declad in a NaOH-- NaHO/sub 3/ solution at 85 to 100 deg C. The resulting slurry filtered and washed with NaOH, NH/sub 4/OH, and H/sub 2/O. Recovery of Cm from filtrate and washings is effected by an Fe(OH)/sub 3/ precipitation. The precipitates are then combined and dissolved ln HCl and refractory oxides centrifuged out. These oxides are then fused with Na/sub 2/CO/sub 3/ and dissolved in HCl. The solution is evaporated and LiCl solution added. The Cm, rare earths, and anionic impurities are adsorbed on a strong-base anfon exchange resin. Impurities are eluted with LiCl--HCl solution, rare earths and Cm are eluted by HCl. Other ion exchange steps further purify the Cm. The Cm is then precipitated as fluoride and used in this form or further purified and processed. (T.R.H.)

Higgins, G.H.; Crane, W.W.T.

1959-05-19T23:59:59.000Z

320

Applications of large-scale computation to particle accelerators  

SciTech Connect

The rapid growth in the power of large-scale computers has had a revolutionary effect on the study of charged-particle accelerators that is similar to the impact of smaller computers on everyday life. Before an accelerator is built, it is now the absolute rule to simulate every component and subsystem by computer to establish modes of operation and tolerances. We will bypass the important and fruitful areas of control and operation, and consider only application to design and diagnostic interpretation. Applications of computers can be divided into separate categories including: component design, system design, stability studies, cost optimization, and operating condition simulation. For the purposes of this report, we will choose a few examples from the above categories to illustrate the methods used, and discuss the significance of the work to the project. We also briefly discuss the accelerator project itself. The examples that will be discussed are: The design of accelerator structures for electron-positron linear colliders and circular colliding beam systems, simulation of the wake fields from multibunch electron beams for linear colliders. Particle-in-cell simulation of space-charge dominated beams for an experimental linear induction accelerator for Heavy Ion Fusion.

Herrmannsfeldt, W.B.

1991-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "large scale wind" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Bench-Scale Evaporation of a Large Hanford Envelope C Sample (Tank 241-AN-102)  

Science Conference Proceedings (OSTI)

This report contains the results of the Bench Scale evaporation of a large sample of pretreated Envelope C (AN102).

Crowder, M.L.

2001-07-13T23:59:59.000Z

322

Large-Scale SST Variability in the Western North Atlantic Subtropical Convergence Zone during FASINEX. Part II: Upper Ocean Heat Balance and Frontogenesis  

Science Conference Proceedings (OSTI)

We analyzed the influence of wind-deriven horizontal heat advection on the large-scale [O(1000) km wavelength] variability of both the upper-ocean mixed-layer heat content and the subtropical frontal zone (SFZ) within an 11° by 10° domain in the ...

George R. Halliwell Jr.; Peter Cornillon

1990-02-01T23:59:59.000Z

323

The Large-Scale Circulation and Heat Sources over the Tibetan Plateau and Surrounding Areas during the Early Summer of 1979. Part I: Precipitation and Kinematic Analyses  

Science Conference Proceedings (OSTI)

The time evolution of the large-scale precipitation, low-level (850 mb) wind, moisture and vertical motion fields over the Tibetan Plateau and surrounding areas during a 40-day period from late May to early July 1979 is studied based on the ...

Huibang Luo; Michio Yanai

1983-05-01T23:59:59.000Z

324

Impacts of Large Amounts of Wind Power on Design and Operation of Power Systems, Results of IEA Collaboration  

SciTech Connect

There are a multitude of studies completed and ongoing related to the cost of wind integration. However, the results are not easy to compare. An international forum for exchange of knowledge of power system impacts of wind power has been formed under the IEA Implementing Agreement on Wind Energy. IEA WIND R and D Task 25 on 'Design and Operation of Power Systems with Large Amounts of Wind Power' produced a state-of-the-art report in October 2007, where the most relevant wind-power grid integration studies were analyzed, especially regarding methodologies and input data. This paper summarizes the results from 18 case studies, with discussion on differences in methodology as well as issues that have been identified to impact the cost of wind integration.

Holttinen, H.; Meibom, P.; Orths, A.; O'Malley, M.; Ummels, B. C.; Tande, J. O.; Estanqueiro, A.; Gomez, E.; Smith, J. C.; Ela, E.

2008-01-01T23:59:59.000Z

325

Adaptive Control of a Utility-Scale Wind Turbine Operating in Region 3  

Science Conference Proceedings (OSTI)

Many challenges exist for the efficient and safe operation of wind turbines due to the difficulty in creating accurate models of their dynamic characteristics and the turbulent conditions in which they operate. A promising new area of wind turbine research is the application of adaptive control techniques, which are well suited to problems where the plant model is not well known and the plant operating conditions are unpredictable. In this paper, we design an adaptive collective pitch controller for a high-fidelity simulation of a utility scale, variable-speed horizontal axis wind turbine operating in Region 3. The objective of the adaptive pitch controller is to regulate generator speed and reject step disturbances, which model the uniform wind disturbance across the wind turbine rotor. The control objective is accomplished by collectively pitching the turbine blades. To improve controller performance, we use an extension of the Direct Model Reference Adaptive Control (DMRAC) approach to regulate turbine rotational speed and to accommodate step disturbances. The turbine simulation models the Controls Advanced Research Turbine (CART) of the National Renewable Energy Laboratory in Golden, Colorado. The CART is a utility-scale wind turbine that has a well-developed and extensively verified simulator. The adaptive collective pitch controller for Region 3 was compared in simulations with a baseline classical Proportional Integrator (PI) collective pitch controller. In the simulations, the adaptive pitch controller showed improved generator speed regulation in Region 3 when compared with the baseline PI pitch controller. The adaptive controller demonstrated robustness to modeling errors and changes in system parameters.

Frost, S. A.; Balas, M. J.; Wright, A. D.

2009-01-01T23:59:59.000Z

326

The identification of inflow fluid dynamics parameters that can be used to scale fatigue loading spectra of wind turbine structural components  

DOE Green Energy (OSTI)

We have recently shown that the alternating load fatigue distributions measured at several locations on a wind turbine operating in a turbulent flow can be described by a mixture of at least three parametric statistical models. The rainflow cycle counting of the horizontal and vertical inflow components results in a similar mixture describing the cyclic content of the wind. We believe such a description highlights the degree of non-Gaussian characteristics of the flow. We present evidence that the severity of the low-cycle, high-amplitude alternating stress loads seen by wind turbine components are a direct consequence of the degree of departure from normality in the inflow. We have examined the details of the turbulent inflow associated with series large loading events that took place on two adjacent wind turbines installed in a large wind park in San Gorgonio Pass, California. In this paper, we describe what we believe to be the agents in the flow that induced such events. We also discuss the atmospheric mechanisms that influence the low-cycle, high-amplitude range loading seen by a number of critical wind turbine components. We further present results that can be used to scale the specific distribution shape as functions of measured inflow fluid dynamics parameters.

Kelley, N.D.

1993-11-01T23:59:59.000Z

327

Advanced I/O for large-scale scientific applications.  

SciTech Connect

As scientific simulations scale to use petascale machines and beyond, the data volumes generated pose a dual problem. First, with increasing machine sizes, the careful tuning of IO routines becomes more and more important to keep the time spent in IO acceptable. It is not uncommon, for instance, to have 20% of an application's runtime spent performing IO in a 'tuned' system. Careful management of the IO routines can move that to 5% or even less in some cases. Second, the data volumes are so large, on the order of 10s to 100s of TB, that trying to discover the scientifically valid contributions requires assistance at runtime to both organize and annotate the data. Waiting for offline processing is not feasible due both to the impact on the IO system and the time required. To reduce this load and improve the ability of scientists to use the large amounts of data being produced, new techniques for data management are required. First, there is a need for techniques for efficient movement of data from the compute space to storage. These techniques should understand the underlying system infrastructure and adapt to changing system conditions. Technologies include aggregation networks, data staging nodes for a closer parity to the IO subsystem, and autonomic IO routines that can detect system bottlenecks and choose different approaches, such as splitting the output into multiple targets, staggering output processes. Such methods must be end-to-end, meaning that even with properly managed asynchronous techniques, it is still essential to properly manage the later synchronous interaction with the storage system to maintain acceptable performance. Second, for the data being generated, annotations and other metadata must be incorporated to help the scientist understand output data for the simulation run as a whole, to select data and data features without concern for what files or other storage technologies were employed. All of these features should be attained while maintaining a simple deployment for the science code and eliminating the need for allocation of additional computational resources.

Klasky, Scott (Oak Ridge National Laboratory, Oak Ridge, TN); Schwan, Karsten (Georgia Institute of Technology, Atlanta, GA); Oldfield, Ron A.; Lofstead, Gerald F., II (Georgia Institute of Technology, Atlanta, GA)

2010-01-01T23:59:59.000Z

328

Open Large-Scale Online Social Network Dyn  

E-Print Network (OSTI)

Online social networks have quickly become the most popular destination on the World Wide Web. These networks are still a fairly new form of online human interaction and have gained wide popularity only recently within the past three to four years. Few models or descriptions of the dynamics of these systems exist. This is largely due to the difficulty in gaining access to the data from these networks which is often viewed as very valuable. In these networks, members maintain list of friends with which they share content with by first uploading it to the social network service provider. The content is then distributed to members by the service provider who generates a feed for each member containing the content shared by all of the member's friends aggregated together. Direct access to dynamic linkage data for these large networks is especially difficult without a special relationship with the service provider. This makes it difficult for researchers to explore and better understand how humans interface with these systems. This dissertation examines an event driven sampling approach to acquire both dynamics link event data and blog content from the site known as LiveJournal. LiveJournal is one of the oldest online social networking sites whose features are very similar to sites such as Facebook and Myspace yet smaller in scale as to be practical for a research setting. The event driven sampling methodology and analysis of the resulting network model provide insights for other researchers interested in acquiring social network dynamics from LiveJournal or insight into what might be expected if an event driven sampling approach was applied to other online social networks. A detailed analysis of both the static structure and network dynamics of the resulting network model was performed. The analysis helped motivated work on a model of link prediction using both topological and content-based metrics. The relationship between topological and content-based metrics was explored. Factored into the link prediction analysis is the open nature of the social network data where new members are constantly joining and current members are leaving. The data used for the analysis spanned approximately two years.

Corlette, Daniel James

2011-05-01T23:59:59.000Z

329

Advanced Planning Method for Integrating Large-Scale Variable Generation  

Science Conference Proceedings (OSTI)

As the penetration and size of renewable generation resources increase, the industry must expand transmission infrastructure to accommodate increasing renewable resource output. Conventional transmission expansion planning requires sufficient transmission capacities to transfer the full name plate capacity of all power plants to load centers at the same time. However, renewable resources, such as wind and solar, have highly variable output and are spatially diversified. Thus, transmission expansion plann...

2009-12-22T23:59:59.000Z

330

GAS MIXING ANALYSIS IN A LARGE-SCALED SALTSTONE FACILITY  

SciTech Connect

Computational fluid dynamics (CFD) methods have been used to estimate the flow patterns mainly driven by temperature gradients inside vapor space in a large-scaled Saltstone vault facility at Savannah River site (SRS). The purpose of this work is to examine the gas motions inside the vapor space under the current vault configurations by taking a three-dimensional transient momentum-energy coupled approach for the vapor space domain of the vault. The modeling calculations were based on prototypic vault geometry and expected normal operating conditions as defined by Waste Solidification Engineering. The modeling analysis was focused on the air flow patterns near the ventilated corner zones of the vapor space inside the Saltstone vault. The turbulence behavior and natural convection mechanism used in the present model were benchmarked against the literature information and theoretical results. The verified model was applied to the Saltstone vault geometry for the transient assessment of the air flow patterns inside the vapor space of the vault region using the potential operating conditions. The baseline model considered two cases for the estimations of the flow patterns within the vapor space. One is the reference nominal case. The other is for the negative temperature gradient between the roof inner and top grout surface temperatures intended for the potential bounding condition. The flow patterns of the vapor space calculated by the CFD model demonstrate that the ambient air comes into the vapor space of the vault through the lower-end ventilation hole, and it gets heated up by the Benard-cell type circulation before leaving the vault via the higher-end ventilation hole. The calculated results are consistent with the literature information. Detailed results and the cases considered in the calculations will be discussed here.

Lee, S

2008-05-28T23:59:59.000Z

331

Metal ion implantation for large scale surface modification  

Science Conference Proceedings (OSTI)

Intense energetic beams of metal ions can be produced by using a metal vapor vacuum arc as the plasma discharge from which the ion beam is formed. We have developed a number of ion sources of this kind and have built a metal ion implantation facility which can produce repetitively pulsed ion beams with mean ion energy up to several hundred key, pulsed beam current of more than an ampere, and time averaged current of several tens of milliamperes delivered onto a downstream target. We've also done some preliminary work on scaling up this technology to very large size. For example, a 50-cm diameter (2000 cm[sup 2]) set of beam formation electrodes was used to produce a pulsed titanium beam with ion current over 7 amperes at a mean ion energy of 100 key. Separately, a dc embodiment has been used to produce a dc titanium ion beam with current over 600 mA, power supply limited in this work, and up to 6 amperes of dc plasma ion current was maintained for over an hour. In a related program we've developed a plasma immersion method for applying thin metallic and compound films in which the added species is atomically mixed to the substrate. By adding a gas flow to the process, well-bonded compound films can also be formed; metallic films and multilayers as well as oxides and nitrides with mixed transition zones some hundreds of angstroms thick have been synthesized. Here we outline these parallel metal-plasma-based research programs and describe the hardware that we've developed and some of the surface modification research that we've done with it.

Brown, I.G.

1992-10-01T23:59:59.000Z

332

Large Scale Computing and Storage Requirements for Nuclear Physics Research  

SciTech Connect

IThe National Energy Research Scientific Computing Center (NERSC) is the primary computing center for the DOE Office of Science, serving approximately 4,000 users and hosting some 550 projects that involve nearly 700 codes for a wide variety of scientific disciplines. In addition to large-scale computing resources NERSC provides critical staff support and expertise to help scientists make the most efficient use of these resources to advance the scientific mission of the Office of Science. In May 2011, NERSC, DOE’s Office of Advanced Scientific Computing Research (ASCR) and DOE’s Office of Nuclear Physics (NP) held a workshop to characterize HPC requirements for NP research over the next three to five years. The effort is part of NERSC’s continuing involvement in anticipating future user needs and deploying necessary resources to meet these demands. The workshop revealed several key requirements, in addition to achieving its goal of characterizing NP computing. The key requirements include: 1. Larger allocations of computational resources at NERSC; 2. Visualization and analytics support; and 3. Support at NERSC for the unique needs of experimental nuclear physicists. This report expands upon these key points and adds others. The results are based upon representative samples, called “case studies,” of the needs of science teams within NP. The case studies were prepared by NP workshop participants and contain a summary of science goals, methods of solution, current and future computing requirements, and special software and support needs. Participants were also asked to describe their strategy for computing in the highly parallel, “multi-core” environment that is expected to dominate HPC architectures over the next few years. The report also includes a section with NERSC responses to the workshop findings. NERSC has many initiatives already underway that address key workshop findings and all of the action items are aligned with NERSC strategic plans.

Gerber, Richard A.; Wasserman, Harvey J.

2012-03-02T23:59:59.000Z

333

Bayesian Uncertainty Quantification for Large Scale Spatial Inverse Problems  

E-Print Network (OSTI)

We considered a Bayesian approach to nonlinear inverse problems in which the unknown quantity is a high dimension spatial field. The Bayesian approach contains a natural mechanism for regularization in the form of prior information, can incorporate information from heterogeneous sources and provides a quantitative assessment of uncertainty in the inverse solution. The Bayesian setting casts the inverse solution as a posterior probability distribution over the model parameters. Karhunen-Lo'eve expansion and Discrete Cosine transform were used for dimension reduction of the random spatial field. Furthermore, we used a hierarchical Bayes model to inject multiscale data in the modeling framework. In this Bayesian framework, we have shown that this inverse problem is well-posed by proving that the posterior measure is Lipschitz continuous with respect to the data in total variation norm. The need for multiple evaluations of the forward model on a high dimension spatial field (e.g. in the context of MCMC) together with the high dimensionality of the posterior, results in many computation challenges. We developed two-stage reversible jump MCMC method which has the ability to screen the bad proposals in the first inexpensive stage. Channelized spatial fields were represented by facies boundaries and variogram-based spatial fields within each facies. Using level-set based approach, the shape of the channel boundaries was updated with dynamic data using a Bayesian hierarchical model where the number of points representing the channel boundaries is assumed to be unknown. Statistical emulators on a large scale spatial field were introduced to avoid the expensive likelihood calculation, which contains the forward simulator, at each iteration of the MCMC step. To build the emulator, the original spatial field was represented by a low dimensional parameterization using Discrete Cosine Transform (DCT), then the Bayesian approach to multivariate adaptive regression spline (BMARS) was used to emulate the simulator. Various numerical results were presented by analyzing simulated as well as real data.

Mondal, Anirban

2011-08-01T23:59:59.000Z

334

Analysis of the Technical and Economic Potential for Mid-Scale Distributed Wind  

NLE Websites -- All DOE Office Websites (Extended Search)

Analysis of the Technical and Analysis of the Technical and Economic Potential for Mid-Scale Distributed Wind December 2007 - October 31, 2008 R. Kwartin, A. Wolfrum, K. Granfield, A. Kagel, and A. Appleton ICF International Fairfax, Virginia Subcontract Report NREL/SR-500-44280 December 2008 An Analysis of the Technical and Economic Potential for Mid-Scale Distributed Wind December 2007 - October 31, 2008 R. Kwartin, A. Wolfrum, K. Granfield, A. Kagel, and A. Appleton ICF International Fairfax, Virginia NREL Technical Monitor: T. Forsyth Prepared under Subcontract No. AAM-8-89001-01 Subcontract Report NREL/SR-500-44280 December 2008 National Renewable Energy Laboratory 1617 Cole Boulevard, Golden, Colorado 80401-3393 303-275-3000 * www.nrel.gov NREL is a national laboratory of the U.S. Department of Energy

335

DOE Hydrogen Analysis Repository: Wind Power Integration  

NLE Websites -- All DOE Office Websites (Extended Search)

Project Summary Full Title: Large-Scale Integration of Wind Power into Different Energy Systems Project ID: 124 Principal Investigator: Henrik Lund Purpose The analysis...

336

Coupling Wind Generators with Deferrable Loads  

NLE Websites -- All DOE Office Websites (Extended Search)

existing deregulated power markets and demand side flexibility could support large scale integration of wind power without significant impacts on grid operations and without the...

337

Short-Term Power Fluctuations of Large Wind Power Plants: Preprint  

DOE Green Energy (OSTI)

With electric utilities and other power providers showing increased interest in wind power and with growing penetration of wind capacity into the market, questions about how wind power fluctuations affect power system operations and about wind power's ancillary services requirements are receiving lots of attention. The project's purpose is to acquire actual, long-term wind power output data for analyzing wind power fluctuations, frequency distribution of the changes, the effects of spatial diversity, and wind power ancillary services.

Wan, Y.; Bucaneg, D.

2002-01-01T23:59:59.000Z

338

Large Scale Computing and Storage Requirements for High Energy Physics  

Science Conference Proceedings (OSTI)

The National Energy Research Scientific Computing Center (NERSC) is the leading scientific computing facility for the Department of Energy's Office of Science, providing high-performance computing (HPC) resources to more than 3,000 researchers working on about 400 projects. NERSC provides large-scale computing resources and, crucially, the support and expertise needed for scientists to make effective use of them. In November 2009, NERSC, DOE's Office of Advanced Scientific Computing Research (ASCR), and DOE's Office of High Energy Physics (HEP) held a workshop to characterize the HPC resources needed at NERSC to support HEP research through the next three to five years. The effort is part of NERSC's legacy of anticipating users needs and deploying resources to meet those demands. The workshop revealed several key points, in addition to achieving its goal of collecting and characterizing computing requirements. The chief findings: (1) Science teams need access to a significant increase in computational resources to meet their research goals; (2) Research teams need to be able to read, write, transfer, store online, archive, analyze, and share huge volumes of data; (3) Science teams need guidance and support to implement their codes on future architectures; and (4) Projects need predictable, rapid turnaround of their computational jobs to meet mission-critical time constraints. This report expands upon these key points and includes others. It also presents a number of case studies as representative of the research conducted within HEP. Workshop participants were asked to codify their requirements in this case study format, summarizing their science goals, methods of solution, current and three-to-five year computing requirements, and software and support needs. Participants were also asked to describe their strategy for computing in the highly parallel, multi-core environment that is expected to dominate HPC architectures over the next few years. The report includes a section that describes efforts already underway or planned at NERSC that address requirements collected at the workshop. NERSC has many initiatives in progress that address key workshop findings and are aligned with NERSC's strategic plans.

Gerber, Richard A.; Wasserman, Harvey

2010-11-24T23:59:59.000Z

339

Control of Large-Scale Heat Transport by Small-Scale Mixing  

Science Conference Proceedings (OSTI)

The equilibrium of an idealized flow driven at the surface by wind stress and rapid relaxation to nonuniform buoyancy is analyzed in terms of entropy production, mechanical energy balance, and heat transport. The flow is rapidly rotating, and ...

Paola Cessi; W. R. Young; Jeff A. Polton

2006-10-01T23:59:59.000Z

340

2009 Wind Technologies Market Report  

E-Print Network (OSTI)

Other utility-scale (>100 kW) wind turbines installed in thesales of small wind turbines 100 kW and less in size intoThe 100 kW cut-off between ‘small’ and ‘large’ wind turbines

Wiser, Ryan

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "large scale wind" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

The Linearly Scaling 3D Fragment Method for Large Scale Electronic Structure Calculations  

Science Conference Proceedings (OSTI)

The Linearly Scaling three-dimensional fragment (LS3DF) method is an O(N) ab initio electronic structure method for large-scale nano material simulations. It is a divide-and-conquer approach with a novel patching scheme that effectively cancels out the artificial boundary effects, which exist in all divide-and-conquer schemes. This method has made ab initio simulations of thousand-atom nanosystems feasible in a couple of hours, while retaining essentially the same accuracy as the direct calculation methods. The LS3DF method won the 2008 ACM Gordon Bell Prize for algorithm innovation. Our code has reached 442 Tflop/s running on 147,456 processors on the Cray XT5 (Jaguar) at OLCF, and has been run on 163,840 processors on the Blue Gene/P (Intrepid) at ALCF, and has been applied to a system containing 36,000 atoms. In this paper, we will present the recent parallel performance results of this code, and will apply the method to asymmetric CdSe/CdS core/shell nanorods, which have potential applications in electronic devices and solar cells.

Zhao, Zhengji; Meza, Juan; Lee, Byounghak; Shan, Hongzhang; Strohmaier, Erich; Bailey, David; Wang, Lin-Wang

2009-06-26T23:59:59.000Z

342

The Coherence Time of Midtropospheric Wind Features as a Function of Vertical Scale from 300 m to 2 km  

Science Conference Proceedings (OSTI)

The coherence between vertical wind profiles separated by a time lag is measured as a function of vertical scale from Doppler radar wind profiler data. Each profile covers altitudes from 6811 m to 16?261 m and is Fourier transformed over a ...

Francis J. Merceret

2000-12-01T23:59:59.000Z

343

Analysis of Wind Power and Load Data at Multiple Time Scales  

E-Print Network (OSTI)

The spectrum of power from wind turbines. Journal of PowerAWEA 2010. American Wind Energy Association ProjectsErik and Jason Kemper. 2009. Wind Plant Ramping Behavior.

Coughlin, Katie

2011-01-01T23:59:59.000Z

344

Analysis of Wind Power and Load Data at Multiple Time Scales  

E-Print Network (OSTI)

AWEA 2010. American Wind Energy Association ProjectsR Liao. 2006. Analyses of Wind Energy Impact on WFEC Systemresources. The American Wind Energy Association maintains a

Coughlin, Katie

2011-01-01T23:59:59.000Z

345

Numerical Simulations of Island-Scale Airflow over Maui and the Maui Vortex under Summer Trade Wind Conditions  

Science Conference Proceedings (OSTI)

The fifth-generation Pennsylvania State University–NCAR Mesoscale Model (MM5) coupled with the Noah land surface model (LSM) is employed to simulate island-scale airflow and circulations over Maui County, Hawaii, under summer trade wind ...

DaNa L. Carlis; Yi-Leng Chen; Vernon R. Morris

2010-07-01T23:59:59.000Z

346

Spatial and Temporal Scales of Boundary Layer Wind Predictability in Response to Small-Amplitude Land Surface Uncertainty  

Science Conference Proceedings (OSTI)

Predictability experiments with the Weather Research and Forecast (WRF) model as a proxy for the atmosphere are analyzed to quantify the spatial and temporal scales of boundary layer wind response to land surface perturbations. Soil moisture is ...

Joshua P. Hacker

2010-01-01T23:59:59.000Z

347

Wind response of a tall building with full-scale observations  

SciTech Connect

A 22-story hotel is the subject of a full-scale experimental study conducted as the second phase of a project addressing the wind-induced response of tall buildings. The first phase of this study investigated a 16-story office building. The observations of wind loading and building response obtained at the hotel site reflect similar behavior as was observed at the office building. Consequently, the second phase serves to reinforce and generalize the findings of the phase one study. The results illustrate the significance of wind-induced response for buildings of intermediate height. Based on estimated thresholds of human perceptibility combined with predictions of maximum building response from a theoretical analysis, clearly perceptible wind-induced motion is expected to occur annually at the hotel. Yet, motion will not be sufficient intensity to be unpleasant. A similar analysis suggests that building response will also produce some non-structural damage on an annual basis. 3 refs., 5 figs., 2 tabs.

Mills, R.S. (California State Univ., Chico, CA (United States))

1991-08-01T23:59:59.000Z

348

Large-scale Excited Electron Molecular Mechanics/Dynamics  

Science Conference Proceedings (OSTI)

Abstract Scope, To simulate large electronically excited systems, we have developed [at the Materials and Process Simulation Center at Caltech] a molecular ...

349

Exploiting separability in large-scale Support Vector Machine training  

E-Print Network (OSTI)

Aug 8, 2007 ... Abstract: Linear support vector machine training can be represented as a large quadratic program. We present an efficient and numerically ...

350

PATHWAYS OF LARGE-SCALE MAGNETIC COUPLINGS BETWEEN SOLAR CORONAL EVENTS  

SciTech Connect

The high-cadence, comprehensive view of the solar corona by SDO/AIA shows many events that are widely separated in space while occurring close together in time. In some cases, sets of coronal events are evidently causally related, while in many other instances indirect evidence can be found. We present case studies to highlight a variety of coupling processes involved in coronal events. We find that physical linkages between events do occur, but concur with earlier studies that these couplings appear to be crucial to understanding the initiation of major eruptive or explosive phenomena relatively infrequently. We note that the post-eruption reconfiguration timescale of the large-scale corona, estimated from the extreme-ultraviolet afterglow, is on average longer than the mean time between coronal mass ejections (CMEs), so that many CMEs originate from a corona that is still adjusting from a previous event. We argue that the coronal field is intrinsically global: current systems build up over days to months, the relaxation after eruptions continues over many hours, and evolving connections easily span much of a hemisphere. This needs to be reflected in our modeling of the connections from the solar surface into the heliosphere to properly model the solar wind, its perturbations, and the generation and propagation of solar energetic particles. However, the large-scale field cannot be constructed reliably by currently available observational resources. We assess the potential of high-quality observations from beyond Earth's perspective and advanced global modeling to understand the couplings between coronal events in the context of CMEs and solar energetic particle events.

Schrijver, Carolus J.; Title, Alan M.; DeRosa, Marc L. [Lockheed Martin Advanced Technology Center, 3251 Hanover Street, Palo Alto, CA 94304 (United States); Yeates, Anthony R. [Department of Mathematical Sciences, Durham University, Science Laboratories, South Road, Durham DH1 3LE (United Kingdom)

2013-08-20T23:59:59.000Z

351

Wind and Wave Extremes over the World Oceans From Very Large Forecast Ensembles  

E-Print Network (OSTI)

Global return value estimates of significant wave height and 10-m neutral wind speed are estimated from very large aggregations of archived ECMWF ensemble forecasts at +240-h lead time from the period 2003-2012. The upper percentiles are found to match ENVISAT wind speed better than ERA-Interim (ERA-I), which tends to be biased low. The return estimates are significantly higher for both wind speed and wave height in the extratropics and the subtropics than what is found from ERA-I, but lower than what is reported by Caires and Sterl (2005) and Vinoth and Young (2011). The highest discrepancies between ERA-I and ENS240 are found in the hurricane-prone areas, suggesting that the ensemble comes closer than ERA-I in capturing the intensity of tropical cyclones. The width of the confidence intervals are typically reduced by 70% due to the size of the data sets. Finally, non-parametric estimates of return values were computed from the tail of the distribution. These direct return estimates compare very well with Ge...

Breivik, Øyvind; Abdalla, Saleh; Bidlot, Jean-Raymond

2013-01-01T23:59:59.000Z

352

Surpassing Expectations: State of the U.S. Wind Power Market  

E-Print Network (OSTI)

States, new large-scale wind turbines were installed in 18The average size of wind turbines installed in the Uniteddominant manufacturer of wind turbines supplying the U.S.

Bolinger, Mark A

2009-01-01T23:59:59.000Z

353

Analyzing the interaction between state tax incentives and the federal production tax credit for wind power  

E-Print Network (OSTI)

Production Tax Credit for Wind Power Ryan Wiser and MarkState Policies Foster a Wind Power Resurgence The ImportancePTC) for large-scale wind power projects. While the federal

Wiser, Ryan; Bolinger, Mark; Gagliano, Troy

2002-01-01T23:59:59.000Z

354

The Cost of Transmission for Wind Energy: A Review of Transmission Planning Studies  

E-Print Network (OSTI)

pdf/0554(2008).pdf European Wind Energy Association (EWEA).Large Scale Integration of Wind Energy in the European PowerPrepared by the European Wind Energy Association. http://

Mills, Andrew D.

2009-01-01T23:59:59.000Z

355

Online job provisioning for large scale science experiments over an optical grid infrastructure  

Science Conference Proceedings (OSTI)

Many emerging science experiments require that the massive data generated by big instruments be accessible and analyzed by a large number of geographically dispersed users. Such large scale science experiments are enabled by an Optical Grid infrastructure ... Keywords: WDM network, grid, job provisioning, large scale science experiment, resource co-scheduling

Xiang Yu; Chunming Qiao; Dantong Yu

2009-04-01T23:59:59.000Z

356

On the Order Optimality of Large-scale Underwater Networks  

E-Print Network (OSTI)

Capacity scaling laws are analyzed in an underwater acoustic network with $n$ regularly located nodes on a square, in which both bandwidth and received signal power can be limited significantly. A narrow-band model is assumed where the carrier frequency is allowed to scale as a function of $n$. In the network, we characterize an attenuation parameter that depends on the frequency scaling as well as the transmission distance. Cut-set upper bounds on the throughput scaling are then derived in both extended and dense networks having unit node density and unit area, respectively. It is first analyzed that under extended networks, the upper bound is inversely proportional to the attenuation parameter, thus resulting in a highly power-limited network. Interestingly, it is seen that the upper bound for extended networks is intrinsically related to the attenuation parameter but not the spreading factor. On the other hand, in dense networks, we show that there exists either a bandwidth or power limitation, or both, ac...

Shin, Won-Yong; Medard, Muriel; Stojanovic, Milica; Tarokh, Vahid

2011-01-01T23:59:59.000Z

357

Decomposition Methods for Large Scale LP Decoding - Optimization ...  

E-Print Network (OSTI)

decoding when implemented with standard LP solvers does not easily scale to the ... not automatically exploit the rich structure inherent to the linear program. ...... To show that (4.10) is satisfied is straightforward for the cases q ? r and q ? r+2. ...... behavior, in particular word-error-rate and execution-time statistics, as a

358

Regional climate consequences of large-scale cool roof and photovoltaic  

NLE Websites -- All DOE Office Websites (Extended Search)

climate consequences of large-scale cool roof and photovoltaic climate consequences of large-scale cool roof and photovoltaic array deployment Title Regional climate consequences of large-scale cool roof and photovoltaic array deployment Publication Type Journal Article Year of Publication 2011 Authors Millstein, Dev, and Surabi Menon Journal Environmental Research Letters Volume 6 Start Page 1 Pagination 9 Date Published 07/2011 Keywords co2 offsets, cool roofs, photovoltaics, radiative forcing, urban environment Abstract Modifications to the surface albedo through the deployment of cool roofs and pavements (reflective materials) and photovoltaic arrays (low reflection) have the potential to change radiative forcing, surface temperatures, and regional weather patterns. In this work we investigate the regional climate and radiative effects of modifying surface albedo to mimic massive deployment of cool surfaces (roofs and pavements) and, separately, photovoltaic arrays across the United States. We use a fully coupled regional climate model, the Weather Research and Forecasting (WRF) model, to investigate feedbacks between surface albedo changes, surface temperature, precipitation and average cloud cover. With the adoption of cool roofs and pavements, domain-wide annual average outgoing radiation increased by 0.16 ± 0.03 W m-2 (mean ± 95% C.I.) and afternoon summertime temperature in urban locations was reduced by 0.11-0.53 "C, although some urban areas showed no statistically significant temperature changes. In response to increased urban albedo, some rural locations showed summer afternoon temperature increases of up to +0.27 "C and these regions were correlated with less cloud cover and lower precipitation. The emissions offset obtained by this increase in outgoing radiation is calculated to be 3.3 ± 0.5 Gt CO2 (mean ± 95% C.I.). The hypothetical solar arrays were designed to be able to produce one terawatt of peak energy and were located in the Mojave Desert of California. To simulate the arrays, the desert surface albedo was darkened, causing local afternoon temperature increases of up to +0.4 "C. Due to the solar arrays, local and regional wind patterns within a 300 km radius were affected. Statistically significant but lower magnitude changes to temperature and radiation could be seen across the domain due to the introduction of the solar arrays. The addition of photovoltaic arrays caused no significant change to summertime outgoing radiation when averaged over the full domain, as interannual variation across the continent obscured more consistent local forcing.

359

Regional climate consequences of large-scale cool roof and photovoltaic  

NLE Websites -- All DOE Office Websites (Extended Search)

climate consequences of large-scale cool roof and photovoltaic climate consequences of large-scale cool roof and photovoltaic array deployment Title Regional climate consequences of large-scale cool roof and photovoltaic array deployment Publication Type Journal Article Year of Publication 2011 Authors Millstein, Dev, and Surabi Menon Journal Environmental Research Letters Volume 6 Start Page 1 Pagination 9 Date Published 07/2011 Keywords co2 offsets, cool roof, photovoltaics, radiative forcing, urban environment Abstract Modifications to the surface albedo through the deployment of cool roofs and pavements (reflective materials) and photovoltaic arrays (low reflection) have the potential to change radiative forcing, surface temperatures, and regional weather patterns. In this work we investigate the regional climate and radiative effects of modifying surface albedo to mimic massive deployment of cool surfaces (roofs and pavements) and, separately, photovoltaic arrays across the United States. We use a fully coupled regional climate model, the Weather Research and Forecasting (WRF) model, to investigate feedbacks between surface albedo changes, surface temperature, precipitation and average cloud cover. With the adoption of cool roofs and pavements, domain-wide annual average outgoing radiation increased by 0.16 ± 0.03 W m-2 (mean ± 95% C.I.) and afternoon summertime temperature in urban locations was reduced by 0.11-0.53 "C, although some urban areas showed no statistically significant temperature changes. In response to increased urban albedo, some rural locations showed summer afternoon temperature increases of up to +0.27 "C and these regions were correlated with less cloud cover and lower precipitation. The emissions offset obtained by this increase in outgoing radiation is calculated to be 3.3 ± 0.5 Gt CO2 (mean ± 95% C.I.). The hypothetical solar arrays were designed to be able to produce one terawatt of peak energy and were located in the Mojave Desert of California. To simulate the arrays, the desert surface albedo was darkened, causing local afternoon temperature increases of up to +0.4 "C. Due to the solar arrays, local and regional wind patterns within a 300 km radius were affected. Statistically significant but lower magnitude changes to temperature and radiation could be seen across the domain due to the introduction of the solar arrays. The addition of photovoltaic arrays caused no significant change to summertime outgoing radiation when averaged over the full domain, as interannual variation across the continent obscured more consistent local forcing.

360

Comparing Large-Scale Hydrological Model Simulations to Observed Runoff Percentiles in Europe  

Science Conference Proceedings (OSTI)

Large-scale hydrological models describing the terrestrial water balance at continental and global scales are increasingly being used in earth system modeling and climate impact assessments. However, because of incomplete process understanding and ...

Lukas Gudmundsson; Lena M. Tallaksen; Kerstin Stahl; Douglas B. Clark; Egon Dumont; Stefan Hagemann; Nathalie Bertrand; Dieter Gerten; Jens Heinke; Naota Hanasaki; Frank Voss; Sujan Koirala

2012-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "large scale wind" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Large-Scale Vertical and Horizontal Circulation in the North Atlantic Ocean  

Science Conference Proceedings (OSTI)

Observations of large-scale hydrography, air–sea forcing, and regional circulation from numerous studies are combined by inverse methods to determine the basin-scale circulation, average diapycnal mixing, and adjustments to air–sea forcing of the ...

Rick Lumpkin; Kevin Speer

2003-09-01T23:59:59.000Z

362

Improved Bounds for Large Scale Capacitated Arc Routing Problem  

E-Print Network (OSTI)

ply a modified Iterated Local Search procedure to Capacitated Vehicle .... ?(S) must be deadheaded because each vehicle entering the set S must leave ...... algorithm clearly outperformed, in terms of solution quality, those that dealt with large.

363

Large-Scale Parallel Computing of Cloud Resolving Storm Simulator  

Science Conference Proceedings (OSTI)

A sever thunderstorm is composed of strong convective clouds. In order to perform a simulation of this type of storms, a very finegrid system is necessary to resolve individual convective clouds within a large domain. Since convective clouds are highly ...

Kazuhisa Tsuboki; Atsushi Sakakibara

2002-05-01T23:59:59.000Z

364

Large scale production of syntactic annotations to move forward  

Science Conference Proceedings (OSTI)

This article presents the methodology of the PASSAGE project, aiming at syntactically annotating large corpora by composing annotations. It introduces the annotation format and the syntactic annotation specifications. It describes an important component ...

Patrick Paroubek; Anne Vilnat; Sylvain Loiseau; Olivier Hamon; Gil Francopoulo; Eric Villemonte de la Clergerie

2008-08-01T23:59:59.000Z

365

Feasibility of Large-Scale CO2 Ocean Sequestration  

NLE Websites -- All DOE Office Websites (Extended Search)

dioxide (CO 2 ) and other greenhouse gas emissions, due in large part to the burning of fossil fuels for energy consumption, has spawned debate over global climate change and...

366

WindPACT Turbine Design Scaling Studies Technical Area 1-Composite Blades for 80- to 120-Meter Rotor  

SciTech Connect

The United States Department of Energy (DOE) through the National Renewable Energy Laboratory (NREL) implemented the Wind Partnership for Advanced Component Technologies (WindPACT) program. As part of the WindPACT program, Global Energy Concepts, LLC (GEC), was awarded contract number YAM-0-30203-01 to examine Technical Area 1-Blade Scaling, Technical Area 2-Turbine Rotor and Blade Logistics, and Technical Area 3-Self-Erecting Towers. This report documents the results of GEC's Technical Area 1-Blade Scaling. The primary objectives of the Blade-Scaling Study are to assess the scaling of current materials and manufacturing technologies for blades of 40 to 60 meters in length, and to develop scaling curves of estimated cost and mass for rotor blades in that size range.

Griffin, D.A.

2001-04-30T23:59:59.000Z

367

NREL: Wind Research - Information and Outreach  

NLE Websites -- All DOE Office Websites (Extended Search)

small wind systems. Printable Version Wind Research Home Capabilities Projects Offshore Wind Research Large Wind Turbine Research Midsize Wind Turbine Research Small Wind Turbine...

368

NETL: News Release - DOE Awards First Three Large-Scale Carbon...  

NLE Websites -- All DOE Office Websites (Extended Search)

9, 2007 DOE Awards First Three Large-Scale Carbon Sequestration Projects U.S. Projects Total 318 Million and Further President Bush's Initiatives to Advance Clean Energy...

369

Large-scale solar projects in the United States have made great...  

NLE Websites -- All DOE Office Websites (Extended Search)

the United States have made great progress in delivering competitively priced renewable electricity September 2013 The price at which electricity from large-scale solar power...

370

A Topological Framework for the Interactive Exploration of Large Scale Turbulent Combustion  

E-Print Network (OSTI)

comparison of terascale combustion simulation data. Mathe-premixed hydrogen ?ames. Combustion and Flame, [7] J. L.of Large Scale Turbulent Combustion Peer-Timo Bremer 1 ,

Bremer, Peer-Timo

2010-01-01T23:59:59.000Z

371

A Tractable Approach to Understanding the Results from Large-Scale 3D Transient  

E-Print Network (OSTI)

) problems or NASA's HPCC (High Performance Computing & Communication) grand challenges, can easily. Introduction Large-scale simulations of physical phenomena on high performance computing systems (often on mas

Peraire, Jaime

372

Technical R eport A practical method for solving large-scale TRS  

E-Print Network (OSTI)

R eport. University of Patras. Department of Mathematics. GR-265 04 Patras, Greece. http://www.math.upatras.gr/. A practical method for solving large-scale TRS.

373

Agent Based Modeling of large- scale socio-technical metal networks  

Science Conference Proceedings (OSTI)

17-02-10. Challenge the future. Delft. University of. Technology. Agent Based Modeling of large- scale socio-technical metal networks. Dr. Igor Nikolic, A.

374

ESS 2012 Peer Review - Nitrogen-Oxygen Battery for Large Scale...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

2012 Frank Delnick, David Ingersoll, Karen Waldrip, Peter Feibelman NitrogenOxygen Battery A Transformational Architecture for Large Scale Energy Storage Power Sources...

375

NREL: News - NREL Offers an Open-Source Solution for Large-Scale...  

NLE Websites -- All DOE Office Websites (Extended Search)

Version News Release NR-3613 NREL Offers an Open-Source Solution for Large-Scale Energy Data Collection and Analysis June 18, 2013 The Energy Department's National...

376

System aspects of large scale implementation of a photovoltaic power plant.  

E-Print Network (OSTI)

?? In this thesis the static and dynamic behavior of large scale grid connected PV power plants are analyzed. A model of a 15 MW… (more)

Ruiz, Álvaro

2011-01-01T23:59:59.000Z

377

Large-scale clustering and complete facet and tag calculation  

Science Conference Proceedings (OSTI)

The State and University Library of Denmark is developing an integrated search system called Summa, and as part of the Summa project a clustering module and a facet module. Simple clusters have been created for a collection of more than six and a half ... Keywords: categorisation, clustering, faceted browsing, large data sets, library metadata

Bolette Ammitzbøll Madsen

2007-09-01T23:59:59.000Z

378

A Cutting Plane Algorithm for Large Scale Semidefinite Relaxations  

E-Print Network (OSTI)

Oct 10, 2001 ... pr o gramm i ng , s p ect ral b undle m et h o d , s u b grad ie n t m et h o d ... b y so lv i ng se v e ral larg e sc ale, un st ru ct ur e d 0 -1 li n e ar pr ...

379

Efficient packet marking for large-scale IP traceback  

Science Conference Proceedings (OSTI)

We present a new approach to IP traceback based on the probabilistic packet marking paradigm. Our approach, which we call randomize-and-link, uses large checksum cords to "link" message fragments in a way that is highly scalable, for the checksums serve ... Keywords: denial-of-service, packet marking, traceback

Michael T. Goodrich

2002-11-01T23:59:59.000Z

380

Probabilistic packet marking for large-scale IP traceback  

Science Conference Proceedings (OSTI)

This paper presents an approach to IP traceback based on the probabilistic packet marking paradigm. Our approach, which we call randomize-and-link, uses large checksum cords to "link" message fragments in a way that is highly scalable, for the checksums ... Keywords: IP, associate addresses, checksum cords, denial of service (DDOS), distributed, probabilistic packet marking, traceback

Michael T. Goodrich

2008-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "large scale wind" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

A Demonstration That Large-Scale Warming Is Not Urban  

Science Conference Proceedings (OSTI)

On the premise that urban heat islands are strongest in calm conditions but are largely absent in windy weather, daily minimum and maximum air temperatures for the period 1950–2000 at a worldwide selection of land stations are analyzed separately ...

David E. Parker

2006-06-01T23:59:59.000Z

382

Scale-free, self-organizing very large sensor networks  

Science Conference Proceedings (OSTI)

In this paper we introduce SFSN, an algorithm for self-organization of Very Large Sensor Networks (VLSN). The 10^6 or more tiny and inexpensive sensors of a VLSN are indistinguishable from one another; they do not have either a physical or a logical ... Keywords: Anonymous nodes, Collision resolution algorithm, Event, Multiple access, Self-organization, Sensor networks

Dan C. Marinescu; Chen Yu; Gabriela M. Marinescu

2010-05-01T23:59:59.000Z

383

Accelerating large-scale data exploration through data diffusion  

Science Conference Proceedings (OSTI)

Data-intensive applications often require exploratory analysis of large datasets. If analysis is performed on distributed resources, data locality can be crucial to high throughput and performance. We propose a "data diffusion" approach that acquires ... Keywords: Falkon, Swift, data caching, data diffusion, data management, data-aware scheduling, data-intensive applications, grid

Ioan Raicu; Yong Zhao; Ian T. Foster; Alex Szalay

2008-06-01T23:59:59.000Z

384

Identifying web strategies for large-scale firms  

Science Conference Proceedings (OSTI)

The World Wide Web has become increasingly important in helping businesses stay competitive. Hence, in the current business environment, it is essential for large firms in established industries to take advantage of the Web and all it has to offer in ... Keywords: integration, internet, organizational goals, strategy, web

Tuncay Bayrak

2008-07-01T23:59:59.000Z

385

A virtual infrastructure for large-scale wireless sensor networks  

Science Conference Proceedings (OSTI)

The primary goal of a wireless sensor network is to collect useful information from the network. Most wireless sensor networks are assumed that the number of nodes are very large and they should operate with confined resources. Consequently it is important ... Keywords: Data collection, Railroad, Topology, Wireless sensor networks

Jeong-Hun Shin; Daeyeon Park

2007-10-01T23:59:59.000Z

386

Estimating Large-Scale Precipitation Minus Evapotranspiration from GRACE Satellite Gravity Measurements  

Science Conference Proceedings (OSTI)

Currently, observations of key components of the earth's large-scale water and energy budgets are sparse or even nonexistent. One key component, precipitation minus evapotranspiration (P ? ET), remains largely unmeasured due to the absence of ...

Sean Swenson; John Wahr

2006-04-01T23:59:59.000Z

387

Large-Scale Atmospheric Forcing by Southeast Pacific Boundary Layer Clouds: A Regional Model Study  

Science Conference Proceedings (OSTI)

A regional model is used to study the radiative effect of boundary layer clouds over the southeast Pacific on large-scale atmosphere circulation during August–October 1999. With the standard settings, the model simulates reasonably well the large-...

Yuqing Wang; Shang-Ping Xie; Bin Wang; Haiming Xu

2005-04-01T23:59:59.000Z

388

Large-Eddy Simulation of Air Parcels in Stratocumulus Clouds: Time Scales and Spatial Variability  

Science Conference Proceedings (OSTI)

Large ensembles of air parcel trajectories driven by the (large-eddy simulation) LES-generated velocity fields from simulations of stratocumulus clouds were analyzed, focusing on statistics of air parcel in-cloud time scales, as well as their ...

Yefim L. Kogan

2006-03-01T23:59:59.000Z

389

MEMPHYS:A large scale water Cerenkov detector at Fréjus  

E-Print Network (OSTI)

A water \\v{C}erenkov detector project, of megaton scale, to be installed in the Fr\\'ejus underground site and dedicated to nucleon decay, neutrinos from supernovae, solar and atmospheric neutrinos, as well as neutrinos from a super-beam and/or a beta-beam coming from CERN, is presented and compared with competitor projects in Japan and in the USA. The performances of the European project are discussed, including the possibility to measure the mixing angle $\\theta_{13}$ and the CP-violating phase $\\delta$.

A. de Bellefon; J. Bouchez; J. Busto; J. -E. Campagne; C. Cavata; J. Dolbeau; J. Dumarchez; P. Gorodetzky; S. Katsanevas; M. Mezzetto; L. Mosca; T. Patzak; P. Salin; A. Tonazzo; C. Volpe

2006-07-17T23:59:59.000Z

390

The Scientific Beaufort Equivalent Scale: Effects on Wind Statistics and Climatological Air-Sea Flux Estimates in the North Atlantic Ocean  

Science Conference Proceedings (OSTI)

The Beaufort equivalent scale of the World Meteorological Organization (WMO), used for decades to transform marine Beaufort estimates to surface wind speeds over the oceans, contains systematic errors that depend nonlinearly on the wind speed. ...

Hans-Jörg Isemer; Lutz Hasse

1991-08-01T23:59:59.000Z

391

Wind Energy Update  

Wind Powering America (EERE)

by the Alliance for Sustainable Energy, LLC. by the Alliance for Sustainable Energy, LLC. Wind Energy Update Wind Powering America January 2012 NATIONAL RENEWABLE ENERGY LABORATORY Evolution of Commercial Wind Technology NATIONAL RENEWABLE ENERGY LABORATORY Small (≤100 kW) Homes Farms Remote Applications (e.g. water pumping, telecom sites, icemaking) Midscale (100-1000 kW) Village Power Hybrid Systems Distributed Power Large, Land-based (1-3 MW) Utility-scale wind farms Large Distributed Power Sizes and Applications Large, Offshore (3-7 MW) Utility-scale wind farms, shallow coastal waters No U.S. installations NATIONAL RENEWABLE ENERGY LABORATORY Capacity & Cost Trends As of January 2012 (AWEA) 0 5000 10000 15000 20000 25000 30000 35000 40000 45000 50000 $- $200 $400 $600 $800 $1,000 $1,200

392

A Bootstrap Technique for Testing the Relationship between Local-Scale Radar Observations of Cloud Occurrence and Large-Scale Atmospheric Fields  

Science Conference Proceedings (OSTI)

A classification scheme is created to map the synoptic-scale (large scale) atmospheric state to distributions of local-scale cloud properties. This mapping is accomplished by a neural network that classifies 17 months of synoptic-scale initial ...

Roger Marchand; Nathaniel Beagley; Sandra E. Thompson; Thomas P. Ackerman; David M. Schultz

2006-11-01T23:59:59.000Z

393

Inflationary susceptibilities, duality and large-scale magnetic fields generation  

E-Print Network (OSTI)

We investigate what can be said about the interaction of scalar fields with Abelian gauge fields during a quasi-de Sitter phase of expansion and under the assumption that the electric and the magnetic susceptibilities do not coincide. The duality symmetry, transforming the magnetic susceptibility into the inverse of the electric susceptibility, exchanges the magnetic and electric power spectra. The mismatch between the two susceptibilities determines an effective refractive index affecting the evolution of the canonical fields. The constraints imposed by the duration of the inflationary phase and by the magnetogenesis requirements pin down the rate of variation of the susceptibilities that is consistent with the observations of the magnetic field strength over astrophysical and cosmological scales but avoids back-reaction problems. The parameter space of this magnetogenesis scenario is wider than in the case when the susceptibilities are equal, as it happens when the inflaton or some other spectator field is solely coupled to the standard gauge kinetic term.

Massimo Giovannini

2013-10-07T23:59:59.000Z

394

Incentive systems for large-scale energy projects  

Science Conference Proceedings (OSTI)

The potential benefits to be obtained and costs incurred from imposing an incentive rate of return system on a project which is government subsidized or is being considered by a regulated utility are described. The logical and procedural steps for measuring cost performance and determining the reward/penalty function for such a system are developed. An important certainty-enhancing feature is discussed. Then two real incentive return systems for large construction projects currently in place are critically appraised in light of criteria previously developed. 24 references, 4 figures, 3 tables.

Hass, J.E.

1984-01-01T23:59:59.000Z

395

WindPACT Turbine Design Scaling Studies: Technical Area 4ƒBalance-of-Station Cost  

NLE Websites -- All DOE Office Websites (Extended Search)

1 * NREL/SR-500-29950 1 * NREL/SR-500-29950 D.A. Shafer, K.R. Strawmyer, R.M. Conley, J.H. Guidinger, D.C. Wilkie, and T.F. Zellman With assistance from D.W. Bernadett Commonwealth Associates, Inc. Jackson, Michigan WindPACT Turbine Design Scaling Studies: Technical Area 4- Balance-of-Station Cost 21 March 2000-15 March 2001 National Renewable Energy Laboratory 1617 Cole Boulevard Golden, Colorado 80401-3393 NREL is a U.S. Department of Energy Laboratory Operated by Midwest Research Institute * * * * Battelle * * * * Bechtel Contract No. DE-AC36-99-GO10337 July 2001 * NREL/SR-500-29950 WindPACT Turbine Desing Scaling Studies: Technical Area 4- Balance-of-Station Cost 21 March 2000-15 March 2001 D.A. Shafer, K.R. Strawmyer, R.M. Conley, J.H. Guidinger, D.C. Wilkie, and T.F. Zellman

396

Introduction to a Large-Scale Biogas Plant in a Dairy Farm  

Science Conference Proceedings (OSTI)

This article describes a large-scale biogas plant in a dairy farm located in the Tongzhou District of Beijing. It is has a treatment capacity of 30t manure and 30t wastewater per day, a total of 60t/d with a residence time of 20 days. Input material ... Keywords: Large scale biogas plant, CHP, Biogas storage within digestor

Xiaolin Fan; Zifu Li; Tingting Wang; Fubin Yin; Xin Jin

2010-12-01T23:59:59.000Z

397

Level-of-detail rendering of large-scale irregular volume datasets using particles  

Science Conference Proceedings (OSTI)

This paper describes a level-of-detail rendering technique for large-scale irregular volume datasets. It is well known that the memory bandwidth consumed by visibility sorting becomes the limiting factor when carrying out volume rendering of such datasets. ... Keywords: large-scale irregular volume, level-of-detail, volume rendering of unstructured meshes

Takuma Kawamura; Naohisa Sakamoto; Koji Koyamada

2010-09-01T23:59:59.000Z

398

An adaptive clustering-based resource discovery scheme for large scale MANETs  

Science Conference Proceedings (OSTI)

An increasing number of smart mobile devices offering the ability to perform various types of ubiquitous computation are emerging as large computer networks with an unprecedented scale. Large Scale Mobile Ad Hoc Networks (MANETs) place strong challenges ... Keywords: adaptive network clustering, distributed algorithms, mobile ad hoc networks, multi-hop head-based non-overlapping clustering, network resource discovery

Saad Al-Ahmadi; Abdullah Al-Dhelaan

2012-04-01T23:59:59.000Z

399

Structural fatigue assessment and management of large-scale port logistics equipments  

Science Conference Proceedings (OSTI)

With the advances of port enterprises, much intensive research has been gradually involved in the structural fatigue assessment and management of port logistics equipments. However, relevant work on large-scale port logistics equipments is still ... Keywords: S-N curve, crack formation, crack propagation life, fatigue assessment, fracture mechanics, gantry cranes, large-scale port logistics equipment, structural safety assessment

Yuan Liu; Weijian Mi; Huiqiang Zheng

2008-11-01T23:59:59.000Z

400

A time management optimization framework for large-scale distributed hardware-in-the-loop simulation  

Science Conference Proceedings (OSTI)

Large-scale distributed HIL(Hardware-In-The-Loop) simulation is an important and indispensable method for testing and verifying complex engineering systems. An important necessary condition for realizing HIL simulation is that the speedup ratio of full-speed ... Keywords: hardware-in-the-loop simulation, large-scale distributed simulation, optimization framework, speedup ratio of simulation, time management

Wei Dong

2013-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "large scale wind" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

A Topological Framework for the Interactive Exploration of Large Scale Turbulent Combustion  

E-Print Network (OSTI)

A Topological Framework for the Interactive Exploration of Large Scale Turbulent Combustion Peer a new topological framework for the analysis of large scale, time-varying, turbulent combustion consumption thresh- olds for an entire time-dependent combustion simulation. By computing augmented merge

Tierny, Julien

402

Large scale continuous visual event recognition using max-margin Hough transformation framework  

Science Conference Proceedings (OSTI)

In this paper we propose a novel method for continuous visual event recognition (CVER) on a large scale video dataset using max-margin Hough transformation framework. Due to high scalability, diverse real environmental state and wide scene variability ... Keywords: Continuous visual event, Event detection, Large scale, Max-margin Hough transform

Bhaskar Chakraborty, Jordi Gonzílez, F. Xavier Roca

2013-10-01T23:59:59.000Z

403

A study of dynamic meta-learning for failure prediction in large-scale systems  

Science Conference Proceedings (OSTI)

Despite years of study on failure prediction, it remains an open problem, especially in large-scale systems composed of vast amount of components. In this paper, we present a dynamic meta-learning framework for failure prediction. It intends to not only ... Keywords: Blue Gene, Dynamic techniques, Failure prediction, Large-scale systems, Meta-learning

Zhiling Lan; Jiexing Gu; Ziming Zheng; Rajeev Thakur; Susan Coghlan

2010-06-01T23:59:59.000Z

404

Remote visualization of large scale data for ultra-high resolution display environments  

Science Conference Proceedings (OSTI)

ParaView is one of the most widely used scientific tools that support parallel visualization of large scale data. The Scalable Adaptive Graphics Environment (SAGE) is a graphics middleware that enables real-time streaming of ultra-high resolution visual ... Keywords: ParaView, SAGE, large-scale data, remote visualization, ultra-high resolution visualization

Sungwon Nam; Byungil Jeong; Luc Renambot; Andrew Johnson; Kelly Gaither; Jason Leigh

2009-11-01T23:59:59.000Z

405

The Roles of Mean Meridional Motions and Large-Scale Eddies in Zonally Averaged Circulations  

Science Conference Proceedings (OSTI)

A hierarchy of zonally averaged atmospheric models is used to study the role of mean meridional motions and large-scale eddies in determining the zonal climate. Five models are developed: a radiative-convective equilibrium model (no large-scale ...

Karl E. Taylor

1980-01-01T23:59:59.000Z

406

Large-Scale Integration of Deferrable Demand and Renewable Energy Sources  

E-Print Network (OSTI)

1 Large-Scale Integration of Deferrable Demand and Renewable Energy Sources Anthony Papavasiliou model for assessing the impacts of the large-scale integration of renewable energy sources. In order to accurately assess the impacts of renewable energy integration and demand response integration

Oren, Shmuel S.

407

U.S. Energy Infrastructure Investment: Large-Scale Integrated Smart Grid  

E-Print Network (OSTI)

U.S. Energy Infrastructure Investment: Large-Scale Integrated Smart Grid Solutions with High: LargeScale Integrated Smart Grid Solutions with High Penetration of Renewable Resources, Dispersed- ing electricity grid. Much attention is being given to smart grid development in the U.S. and around

408

Large-Scale Hybrid Dynamic Simulation Employing Field Measurements  

Science Conference Proceedings (OSTI)

Simulation and measurements are two primary ways for power engineers to gain understanding of system behaviors and thus accomplish tasks in system planning and operation. Many well-developed simulation tools are available in today's market. On the other hand, large amount of measured data can be obtained from traditional SCADA systems and currently fast growing phasor networks. However, simulation and measurement are still two separate worlds. There is a need to combine the advantages of simulation and measurements. In view of this, this paper proposes the concept of hybrid dynamic simulation which opens up traditional simulation by providing entries for measurements. A method is presented to implement hybrid simulation with PSLF/PSDS. Test studies show the validity of the proposed hybrid simulation method. Applications of such hybrid simulation include system event playback, model validation, and software validation.

Huang, Zhenyu; Guttromson, Ross T.; Hauer, John F.

2004-06-30T23:59:59.000Z

409

Analysis of Wind Power and Load Data at Multiple Time Scales  

E-Print Network (OSTI)

Minnesota statewide wind integration study. November 2006.of net load vs. load Wind integration studies are generallyIt would be very useful to wind integration studies if this

Coughlin, Katie

2011-01-01T23:59:59.000Z

410

Analysis of Wind Power and Load Data at Multiple Time Scales  

E-Print Network (OSTI)

by a set of integrated wind farms increases, the behavior ofto the spatial distribution of wind farms and the total MW.line dates for the various wind farms were not provided, so

Coughlin, Katie

2011-01-01T23:59:59.000Z

411

Analysis of Wind Power and Load Data at Multiple Time Scales  

E-Print Network (OSTI)

Huei. 2005. Primer on Wind Power for Utility Applications.Wan, Yih-Huei. 2004. Wind Power Plant Behaviors: Analysesof Long-Term Wind Power Data. National Renewable Energy Lab

Coughlin, Katie

2011-01-01T23:59:59.000Z

412

Large-scale Renewable Energy Projects (Larger than 10 MWs) | Department of  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Large-scale Renewable Energy Projects (Larger than 10 MWs) Large-scale Renewable Energy Projects (Larger than 10 MWs) Large-scale Renewable Energy Projects (Larger than 10 MWs) October 7, 2013 - 9:32am Addthis Renewable energy projects larger than 10 megawatts (MW) are complex and typically require private-sector financing. The Federal Energy Management Program (FEMP) developed a guide to help Federal agencies, and the developers and financiers that work with them, to successfully install these projects at Federal facilities. The Large-Scale Renewable Energy Guide: Developing Renewable Energy Projects Larger than 10 MWs at Federal Facilities: A Practical Guide to Getting Large-Scale Renewable Energy Projects Financed with Private Capital provides a framework to allow the Federal Government, private developers, and financiers to work in a

413

Hungary-Employment Impacts of a Large-Scale Deep Building Retrofit  

Open Energy Info (EERE)

Hungary-Employment Impacts of a Large-Scale Deep Building Retrofit Hungary-Employment Impacts of a Large-Scale Deep Building Retrofit Programme Jump to: navigation, search Name Hungary-Employment Impacts of a Large-Scale Deep Building Retrofit Programme Agency/Company /Organization European Climate Foundation Sector Energy Focus Area Energy Efficiency, Buildings, - Building Energy Efficiency Topics Co-benefits assessment, Background analysis Resource Type Publications Website http://3csep.ceu.hu/sites/defa Country Hungary UN Region Eastern Europe References Hungary-Employment Impacts of a Large-Scale Deep Building Retrofit Programme[1] Hungary-Employment Impacts of a Large-Scale Deep Building Retrofit Programme Screenshot "The goal of the present research was to gauge the net employment impacts of a largescale deep building energy-efficiency renovation programme in

414

Strategies to Finance Large-Scale Deployment of Renewable Energy Projects:  

Open Energy Info (EERE)

Strategies to Finance Large-Scale Deployment of Renewable Energy Projects: Strategies to Finance Large-Scale Deployment of Renewable Energy Projects: An Economic Development and Infrastructure Approach Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Strategies to Finance Large-Scale Deployment of Renewable Energy Projects: An Economic Development and Infrastructure Approach Agency/Company /Organization: International Energy Agency (IEA) Sector: Energy Focus Area: Renewable Energy Topics: Finance, Implementation, Policies/deployment programs Resource Type: Publications Website: iea-retd.org/archives/publications/finance-re Cost: Free Language: English Strategies to Finance Large-Scale Deployment of Renewable Energy Projects: An Economic Development and Infrastructure Approach Screenshot References: Strategies to Finance Large-Scale Deployment of Renewable Energy Projects: An Economic Development and Infrastructure Approach[1]

415

Modern Sorters for Soil Segregation on Large Scale Remediation Projects  

Science Conference Proceedings (OSTI)

In the mid-1940's, Dr. C. Lapointe developed a Geiger tube based uranium ore scanner and picker to replace hand-cobbing. In the 1990's, a modern version of the Lapointe Picker for soil sorting was developed around the need to clean the Johnston Atoll of plutonium. It worked well with sand, but these systems are ineffective with soil, especially with wet conditions. Additionally, several other constraints limited throughput. Slow moving belts and thin layers of material on the belt coupled with the use of multiple small detectors and small sorting gates make these systems ineffective for high throughput. Soil sorting of clay-bearing soils and building debris requires a new look at both the material handling equipment, and the radiation detection methodology. A new class of Super-Sorters has attained throughput of one hundred times that of the old designs. Higher throughput means shorter schedules which reduce costs substantially. The planning, cost, implementation, and other site considerations for these new Super-Sorters are discussed. Modern soil segregation was developed by Ed Bramlitt of the Defense Nuclear Agency for clean up at Johnston Atoll. The process eventually became the Segmented Gate System (SGS). This system uses an array of small sodium iodide (NaI) detectors, each viewing a small volume (segment), that control a gate. The volume in the gate is approximately one kg. This system works well when the material to be processed is sand; however, when the material is wet and sticky (soils with clays) the system has difficulty moving the material through the gates. Super-Sorters are a new class of machine designed to take advantage of high throughput aggregate processing conveyors, large acquisition volumes, and large NaI detectors using gamma spectroscopy. By using commercially available material handling equipment, the system can attain processing rates of up to 400 metric tons/hr with spectrum acquisition approximately every 0.5 sec, so the acquisition volume is 50 kilograms or less. Smaller sorting volumes can be obtained with lower throughput or by re-sorting the diverted material. This equipment can also handle large objects. The use of spectroscopy systems allows several regions of- interest to be set. Super-Sorters can bring waste processing charges down to less than $30/ metric ton on smaller jobs and can save hundreds of dollars per metric ton in disposal charges. The largest effect on the overall project cost occurs during planning and implementation. The overall goal is reduction of the length of the project, which dictates the most efficient soil processing. With all sorting systems the parameters that need to be accounted for are matrix type, soil feed rate, soil pre-processing, site conditions, and regulatory issues. The soil matrix and its ability to flow are extremely crucial to operations. It is also important to consider that as conditions change (i.e., moisture), the flowability of the soil matrix will change. Many soil parameters have to be considered: cohesive strength, internal and wall friction, permeability, and bulk density as a function of consolidating pressure. Clay bearing soils have very low permeability and high cohesive strength which makes them difficult to process, especially when wet. Soil feed speed is dependent on the equipment present and the ability to move the soil in the Super-Sorter processing area. When a Super-Sorter is running at 400 metric tons per hour it is difficult to feed the system. As an example, front-end loaders with large buckets would move approximately 5-10 metric tons of material, and 400 metric tons per hour would require 50-100 bucket-loads per hour to attain. Because the flowability of the soil matrix is important, poor material is often pre-processed before it is added to the feed hopper of the 'survey' conveyor. This pre-processing can consist of a 'grizzly' to remove large objects from the soil matrix, followed screening plant to prepare the soil so that it feeds well. Hydrated lime can be added to improve material properties. Site conditions (site

Shonka, J.J.; Kelley, J.E.; O'Brien, J.M. [Shonka Research Associates, Inc., 4939 Lower Roswell Road, Suite 106, Marietta, Georgia 3006 (United States)

2008-01-15T23:59:59.000Z

416

Design and operation of power systems with large amounts of wind power  

E-Print Network (OSTI)

Production”has been formed in IEA Wind. The R&D task will collect and share information on the experience gained and the studies made on power system impacts of wind power, and review methodologies, tools and data used. This paper outlines the power system impacts of wind power, the national studies published and ongoing and describes the goals of the international collaboration. There are dozens of studies made and ongoing related to cost of wind integration, however, the results are not easy to compare. An indepth review of the studies is needed to draw conclusions on the range of integration costs for wind power. Stateofthe art review process will seek for reasons behind the wide range of results for costs of wind integration –definitions for wind penetration, reserves and costs; different power system and load characteristics and operational rules; underlying assumptions on variability of wind etc. 1

Hannele Holttinen; Peter Meibom; Cornel Ensslin; Lutz Hofmann; John Mccann; Jan Pierik; John Olav T

2009-01-01T23:59:59.000Z

417

Distributed Small-Scale Wind in New Zealand: Advantages, Barriers and Policy Support Instruments.  

E-Print Network (OSTI)

??Despite having one of the best wind resources in the world, New Zealand’s wind energy industry is growing at a slower rate than the OECD… (more)

Barry, Martin

2007-01-01T23:59:59.000Z

418

Energy storage technology-environmental implications of large scale utilization  

SciTech Connect

Environmental impacts for several energy storage technologies have been identified. State-of-the-art control technology options were similarly identified. Recommendations for research and development on new control technology were made where present controls were either deemed inadequate or non-existent. Specifically, the energy storage technologies under study included: advanced lead-acid battery, compressed air, underground pumped hydroelectric, flywheel, superconducting magnet and various thermal systems (sensible, latent heat and reversible chemical reaction). In addition, a preliminary study was conducted on fuel cell technology. Although not strictly classified as an energy storage system, fuel cells in conjunction with product recycling units can serve an energy storage function. A very large number of potential environmental impacts can be identified for all of these technologies. However, not all are of primary importance. Detailed discussions of a number of environmental impacts from the latest LASL study as they relate to primarily operational situations are emphasized. In addition, a brief discussion on new application for energy storage technologies and the additional costs of controls to be used for mitigation of specific impacts are also presented.

Krupka, M.C.; Moore, J.E.; Keller, W.E.; Baca, G.A.; Brasier, R.I.; Bennett, W.S.

1979-01-01T23:59:59.000Z

419

Extended tension leg platform design for offshore wind turbine systems  

E-Print Network (OSTI)

The rise of reliable wind energy application has become a primary alternative to conventional fossil fuel power plants in the United States and around the world. The feasibility of building large scale wind farms has become ...

Parker, Nicholas W. (Nicholas William)

2007-01-01T23:59:59.000Z

420

Energy Department Awards $66.7 Million for Large-Scale Carbon Sequestration  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

66.7 Million for Large-Scale Carbon 66.7 Million for Large-Scale Carbon Sequestration Project Energy Department Awards $66.7 Million for Large-Scale Carbon Sequestration Project December 18, 2007 - 4:58pm Addthis Regional Partner to Demonstrate Safe and Permanent Storage of One Million Tons of CO2 at Illinois Site WASHINGTON, DC - Following closely on the heels of three recent awards through the Department of Energy's (DOE) Regional Carbon Sequestration Partnership Program, DOE today awarded $66.7 million to the Midwest Geological Sequestration Consortium (MGSC) for the Department's fourth large-scale carbon sequestration project. The Partnership led by the Illinois State Geological Survey will conduct large volume tests in the Illinois Basin to demonstrate the ability of a geologic formation to

Note: This page contains sample records for the topic "large scale wind" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

DOE Awards $126.6 Million for Two More Large-Scale Carbon Sequestration  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

$126.6 Million for Two More Large-Scale Carbon $126.6 Million for Two More Large-Scale Carbon Sequestration Projects DOE Awards $126.6 Million for Two More Large-Scale Carbon Sequestration Projects May 6, 2008 - 11:30am Addthis Projects in California and Ohio Join Four Others in Effort to Drastically Reduce Greenhouse Gas Emissions WASHINGTON, DC - The U.S. Department of Energy (DOE) today announced awards of more than $126.6 million to the West Coast Regional Carbon Sequestration Partnership (WESTCARB) and the Midwest Regional Carbon Sequestration Partnership (MRCSP) for the Department's fifth and sixth large-scale carbon sequestration projects. These industry partnerships, which are part of DOE's Regional Carbon Sequestration Partnership, will conduct large volume tests in California and Ohio to demonstrate the ability of a geologic

422

First U.S. Large-Scale CO2 Storage Project Advances | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

First U.S. Large-Scale CO2 Storage Project Advances First U.S. Large-Scale CO2 Storage Project Advances First U.S. Large-Scale CO2 Storage Project Advances April 6, 2009 - 1:00pm Addthis Washington, DC - Drilling nears completion for the first large-scale carbon dioxide (CO2) injection well in the United States for CO2 sequestration. This project will be used to demonstrate that CO2 emitted from industrial sources - such as coal-fired power plants - can be stored in deep geologic formations to mitigate large quantities of greenhouse gas emissions. The Archer Daniels Midland Company (ADM) hosted an event April 6 for a CO2 injection test at their Decatur, Ill. ethanol facility. The injection well is being drilled into the Mount Simon Sandstone to a depth more than a mile beneath the surface. This is the first drilling into the sandstone geology

423

NREL: Wind Research - Publications  

NLE Websites -- All DOE Office Websites (Extended Search)

Publications Publications The NREL wind research program develops publications about its R&D activities in wind energy technologies. Below you'll find links to recently published publications, links to the NREL Avian Literature and Publications Databases, and information about the Technical Library at the National Wind Technology Center (NWTC). The NWTC's quarterly newsletter, @NWTC, contains articles on current wind energy research projects and highlights the latest reports, papers, articles, and events published or sponsored by NREL. Subscribe to @NWTC. Selected Publications Featured Publication Large-scale Offshore Wind Power in the United States: Assessment of Opportunities and Barriers Here are some selected NWTC publications: 2011 Cost of Wind Energy Review Built-Environment Wind Turbine Roadmap

424

CgWind: A high-order accurate simulation tool for wind turbines and wind farms  

DOE Green Energy (OSTI)

CgWind is a high-fidelity large eddy simulation (LES) tool designed to meet the modeling needs of wind turbine and wind park engineers. This tool combines several advanced computational technologies in order to model accurately the complex and dynamic nature of wind energy applications. The composite grid approach provides high-quality structured grids for the efficient implementation of high-order accurate discretizations of the incompressible Navier-Stokes equations. Composite grids also provide a natural mechanism for modeling bodies in relative motion and complex geometry. Advanced algorithms such as matrix-free multigrid, compact discretizations and approximate factorization will allow CgWind to perform highly resolved calculations efficiently on a wide class of computing resources. Also in development are nonlinear LES subgrid-scale models required to simulate the many interacting scales present in large wind turbine applications. This paper outlines our approach, the current status of CgWind and future development plans.

Chand, K K; Henshaw, W D; Lundquist, K A; Singer, M A

2010-02-22T23:59:59.000Z

425

Method for large-scale fabrication of atomic-scale structures on material surfaces using surface vacancies  

DOE Patents (OSTI)

A method for forming atomic-scale structures on a surface of a substrate on a large-scale includes creating a predetermined amount of surface vacancies on the surface of the substrate by removing an amount of atoms on the surface of the material corresponding to the predetermined amount of the surface vacancies. Once the surface vacancies have been created, atoms of a desired structure material are deposited on the surface of the substrate to enable the surface vacancies and the atoms of the structure material to interact. The interaction causes the atoms of the structure material to form the atomic-scale structures.

Lim, Chong Wee (Urbana, IL); Ohmori, Kenji (Urbana, IL); Petrov, Ivan Georgiev (Champaign, IL); Greene, Joseph E. (Champaign, IL)

2004-07-13T23:59:59.000Z

426

Sizing of isolated wind-electrolyzer systems by use of a probalistic method  

Science Conference Proceedings (OSTI)

Wind Power is currently the fastest growing energy source in the world. Norway is one of the best-situated European countries for using wind power, and several large-scale wind farms are given concession. If wind power is combined with other energy sources ... Keywords: dimensioning, electrolysis, hydrogen storage, isolated systems, probalistic methods, wind power

Terje Gjengedal; Lars Nesje Grimsmo; Magnus Korpaas

2008-02-01T23:59:59.000Z

427

Analysis of Wind Power and Load Data at Multiple Time Scales  

NLE Websites -- All DOE Office Websites (Extended Search)

47E 47E ERNEST ORLANDO LAWRENCE BERKELEY NATIONAL LABORATORY Analysis of Wind Power and Load Data at Multiple Time Scales Katie Coughlin and Joseph H. Eto Environmental Energy Technologies Division December 2010 The work described in this report was funded by the Federal Energy Regulatory Commission, Office of Electric Reliability. The Lawrence Berkeley National Laboratory is operated by the University of California for the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. Disclaimer This document was prepared as an account of work sponsored by the United States Government. While this document is believed to contain correct information, neither the United States Government nor any agency thereof, nor The Regents of the

428

European Wind Energy Conference & Exhibition EWEC 2003, Madrid, Spain. Forecasting of Regional Wind Generation by a Dynamic  

E-Print Network (OSTI)

European Wind Energy Conference & Exhibition EWEC 2003, Madrid, Spain. Forecasting of Regional Wind forecasting. I. INTRODUCTION HE actual large-scale integration of wind energy in several European countries enhance the position of wind energy compared to other dispatchable forms of generation. Predicting

Paris-Sud XI, Université de

429

The role of large-scale, extratropical dynamics in climate change  

SciTech Connect

The climate modeling community has focused recently on improving our understanding of certain processes, such as cloud feedbacks and ocean circulation, that are deemed critical to climate-change prediction. Although attention to such processes is warranted, emphasis on these areas has diminished a general appreciation of the role played by the large-scale dynamics of the extratropical atmosphere. Lack of interest in extratropical dynamics may reflect the assumption that these dynamical processes are a non-problem as far as climate modeling is concerned, since general circulation models (GCMs) calculate motions on this scale from first principles. Nevertheless, serious shortcomings in our ability to understand and simulate large-scale dynamics exist. Partly due to a paucity of standard GCM diagnostic calculations of large-scale motions and their transports of heat, momentum, potential vorticity, and moisture, a comprehensive understanding of the role of large-scale dynamics in GCM climate simulations has not been developed. Uncertainties remain in our understanding and simulation of large-scale extratropical dynamics and their interaction with other climatic processes, such as cloud feedbacks, large-scale ocean circulation, moist convection, air-sea interaction and land-surface processes. To address some of these issues, the 17th Stanstead Seminar was convened at Bishop`s University in Lennoxville, Quebec. The purpose of the Seminar was to promote discussion of the role of large-scale extratropical dynamics in global climate change. Abstracts of the talks are included in this volume. On the basis of these talks, several key issues emerged concerning large-scale extratropical dynamics and their climatic role. Individual records are indexed separately for the database.

Shepherd, T.G. [ed.

1994-02-01T23:59:59.000Z

430

Strong effect of weak diffusion on scalar turbulence at large scales  

E-Print Network (OSTI)

Passive scalar turbulence forced steadily is characterized by the velocity correlation scale, $L$, injection scale, $l$, and diffusive scale, $r_d$. The scales are well separated if the diffusivity is small, $r_d\\ll l,L$, and one normally says that effects of diffusion are confined to smaller scales, $r\\ll r_d$. However, if the velocity is single scale one finds that a weak dependence of the scalar correlations on the molecular diffusivity persists to even larger scales, e.g. $l\\gg r\\gg r_d$ \\cite{95BCKL}. We consider the case of $L\\gg l$ and report a counter-intuitive result -- the emergence of a new range of large scales, $L\\gg r\\gg l^2/r_d$, where the diffusivity shows a strong effect on scalar correlations.

M. Chertkov; I. Kolokolov; V. Lebedev

2007-06-20T23:59:59.000Z

431

Approaches to large scale unsaturated flow in heterogeneous, stratified, and fractured geologic media  

Science Conference Proceedings (OSTI)

This report develops a broad review and assessment of quantitative modeling approaches and data requirements for large-scale subsurface flow in radioactive waste geologic repository. The data review includes discussions of controlled field experiments, existing contamination sites, and site-specific hydrogeologic conditions at Yucca Mountain. Local-scale constitutive models for the unsaturated hydrodynamic properties of geologic media are analyzed, with particular emphasis on the effect of structural characteristics of the medium. The report further reviews and analyzes large-scale hydrogeologic spatial variability from aquifer data, unsaturated soil data, and fracture network data gathered from the literature. Finally, various modeling strategies toward large-scale flow simulations are assessed, including direct high-resolution simulation, and coarse-scale simulation based on auxiliary hydrodynamic models such as single equivalent continuum and dual-porosity continuum. The roles of anisotropy, fracturing, and broad-band spatial variability are emphasized. 252 refs.

Ababou, R.

1991-08-01T23:59:59.000Z

432

Observed Large-Scale Structures and Diabatic Heating and Drying Profiles during TWP-ICE  

Science Conference Proceedings (OSTI)

This study documents the characteristics of the large-scale structures and diabatic heating and drying profiles observed during the Tropical Warm Pool–International Cloud Experiment (TWP-ICE), which was conducted in January–February 2006 in ...

Shaocheng Xie; Timothy Hume; Christian Jakob; Stephen A. Klein; Renata B. McCoy; Minghua Zhang

2010-01-01T23:59:59.000Z

433

Horizontal Structure and Seasonality of Large-Scale Circulations Associated with Submonthly Tropical Convection  

Science Conference Proceedings (OSTI)

The relationship between deep tropical convection and large-scale atmospheric circulation in the 6–30-day period range is examined. Regression relationships between filtered outgoing longwave radiation at various locations in the Tropics and 200- ...

George N. Kiladis; Klaus M. Weickmann

1997-09-01T23:59:59.000Z

434

Conjugate-Gradient Methods for Large-Scale Minimization in Meteorology  

Science Conference Proceedings (OSTI)

During the last few years new meteorological variational analysis methods have evolved, requiring large-scale minimization of a nonlinear objective function described in terms of discrete variables. The conjugate-gradient method was found to ...

I. M. Navon; David M. Legler

1987-08-01T23:59:59.000Z

435

How Well Do Large-Scale Models Reproduce Regional Hydrological Extremes in Europe?  

Science Conference Proceedings (OSTI)

This paper presents a new methodology for assessing the ability of gridded hydrological models to reproduce large-scale hydrological high and low flow events (as a proxy for hydrological extremes) as described by catalogues of historical droughts [...

Christel Prudhomme; Simon Parry; Jamie Hannaford; Douglas B. Clark; Stefan Hagemann; Frank Voss

2011-12-01T23:59:59.000Z

436

DOE's Office of Science Seeks Proposals for Expanded Large-Scale Scientific  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Seeks Proposals for Expanded Large-Scale Seeks Proposals for Expanded Large-Scale Scientific Computing DOE's Office of Science Seeks Proposals for Expanded Large-Scale Scientific Computing May 16, 2005 - 12:47pm Addthis WASHINGTON, D.C. -- Secretary of Energy Samuel W. Bodman announced today that DOE's Office of Science is seeking proposals to support innovative, large-scale computational science projects to enable high-impact advances through the use of advanced computers not commonly available in academia or the private sector. Projects currently funded are helping to reduce engine pollution and to improve our understanding of the stars and solar systems and human genetics. Successful proposers will be given the use of substantial computer time and data storage at the department's scientific

437

DOE's Office of Science Seeks Proposals for Expanded Large-Scale Scientific  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

DOE's Office of Science Seeks Proposals for Expanded Large-Scale DOE's Office of Science Seeks Proposals for Expanded Large-Scale Scientific Computing DOE's Office of Science Seeks Proposals for Expanded Large-Scale Scientific Computing May 16, 2005 - 12:47pm Addthis WASHINGTON, D.C. -- Secretary of Energy Samuel W. Bodman announced today that DOE's Office of Science is seeking proposals to support innovative, large-scale computational science projects to enable high-impact advances through the use of advanced computers not commonly available in academia or the private sector. Projects currently funded are helping to reduce engine pollution and to improve our understanding of the stars and solar systems and human genetics. Successful proposers will be given the use of substantial computer time and data storage at the department's scientific

438

Large-Scale Residential Energy Efficiency Programs Based on CFLs | Open  

Open Energy Info (EERE)

Large-Scale Residential Energy Efficiency Programs Based on CFLs Large-Scale Residential Energy Efficiency Programs Based on CFLs Jump to: navigation, search Tool Summary Name: Large-Scale Residential Energy Efficiency Programs Based on CFLs Agency/Company /Organization: Energy Sector Management Assistance Program of the World Bank Sector: Energy Focus Area: Energy Efficiency, Buildings Topics: Implementation, Policies/deployment programs Website: www.esmap.org/filez/pubs/216201021421_CFL_Toolkit_Web_Version_021610_R References: Large-Scale Residential Energy Efficiency Programs Based on CFLs[1] Overview "The World Bank Group and its Energy Sector Management Assitance Progamme (ESMAP) have produced a toolkit for efficient lighting programmes, based on compact fluorescent lamps, that compiles and shares operational (design,

439

ARM - PI Product - Large Scale Ice Water Path and 3-D Ice Water Content  

NLE Websites -- All DOE Office Websites (Extended Search)

ProductsLarge Scale Ice Water Path and 3-D Ice Water ProductsLarge Scale Ice Water Path and 3-D Ice Water Content Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send PI Product : Large Scale Ice Water Path and 3-D Ice Water Content Site(s) SGP TWP General Description Cloud ice water concentration is one of the most important, yet poorly observed, cloud properties. Developing physical parameterizations used in general circulation models through single-column modeling is one of the key foci of the ARM program. In addition to the vertical profiles of temperature, water vapor and condensed water at the model grids, large-scale horizontal advective tendencies of these variables are also required as forcing terms in the single-column models. Observed horizontal advection of condensed water has not been available because the

440

The Nonlinear Response of the Atmosphere to Large-Scale Mechanical and Thermal Forcing  

Science Conference Proceedings (OSTI)

The subject of large-scale mountain waves is reviewed briefly. Existing mountain wave theory based on a linear system is shown to give an inadequate description of the balance of angular momentum. The response of the atmosphere to mechanical ...

Guo-Xiong Wu

1984-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "large scale wind" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

On-demand computation of policy based routes for large-scale network simulation  

Science Conference Proceedings (OSTI)

Routing table storage demands pose a significant obstacle for large-scale network simulation. On-demand computation of routes can alleviate those problems for models that do not require representation of routing dynamics. However, policy based routes, ...

Michael Liljenstam; David M. Nicol

2004-12-01T23:59:59.000Z

442

Impact of Large Scale Energy Efficiency Programs On Consumer Tariffs and Utility Finances in India  

E-Print Network (OSTI)

and are added to the utility’s rate base. Large-scale EE2009a, 2009b, 2009c). utility’s rate base, and the utilityto the grid at a higher rate if the utility does not face

Abhyankar, Nikit

2011-01-01T23:59:59.000Z

443

Sensitivity of Tropical Convection to Sea Surface Temperature in the Absence of Large-Scale Flow  

Science Conference Proceedings (OSTI)

The response of convection to changing sea surface temperature (SST) in the absence of large-scale flow is examined, using a three-dimensional cloud resolving model. The model includes a five-category bulk microphysical scheme representing snow, ...

Adrian M. Tompkins; George C. Craig

1999-02-01T23:59:59.000Z

444

A case study in meta-simulation design and performance analysis for large-scale networks  

Science Conference Proceedings (OSTI)

Simulation and emulation techniques are fundamental to aid the process of large-scale protocol design and network operations. However, the results from these techniques are often view with a great deal of skepticism from the networking community. Criticisms ...

David Bauer; Garrett Yaun; Christopher D. Carothers; Murat Yuksel; Shivkumar Kalyanaraman

2004-12-01T23:59:59.000Z

445

Tropical Instability Wave Variability in the Pacific and Its Relation to Large-Scale Currents  

Science Conference Proceedings (OSTI)

Shipboard acoustic Doppler current profiler (ADCP)-derived zonal currents from 170° to 110°W are assembled into composite seasonal and ENSO cycles to produce detailed representations of large-scale ocean flow regimes that favor tropical ...

Eric S. Johnson; Jeffrey A. Proehl

2004-10-01T23:59:59.000Z

446

On the Completeness of Multi-Variate Optimum Interpolation for Large-Scale Meteorological Analysis  

Science Conference Proceedings (OSTI)

The Baer-Tribbia nonlinear modal initialization method implies that large-scale meteorological analyses should focus on analysis of slow mode fields. An idealized multi-variate optimum interpolation analysis is shown to produce grid point results ...

Norman A. Phillips

1982-10-01T23:59:59.000Z

447

A Hybrid Kalman Filter Algorithm for Large-Scale Atmospheric Chemistry Data Assimilation  

Science Conference Proceedings (OSTI)

In the past, a number of algorithms have been introduced to solve data assimilation problems for large-scale applications. Here, several Kalman filters, coupled to the European Operational Smog (EUROS) atmospheric chemistry transport model, are ...

R. G. Hanea; G. J. M. Velders; A. J. Segers; M. Verlaan; A. W. Heemink

2007-01-01T23:59:59.000Z

448

Energy Transmission by Barotropic Rossby Waves across Large-Scale Topography  

Science Conference Proceedings (OSTI)

An analytical study investigates the energy transmission by free, barotropic, linear Rossby waves across a large scale bottom topography when topographic and beta-effects have the same order of magnitude. In open ocean regions which are not ...

Bernard Barnier

1984-02-01T23:59:59.000Z

449

Large-Scale Environmental Parameters Associated with Tropical Cyclone Formations in the Western North Pacific  

Science Conference Proceedings (OSTI)

The local environmental conditions associated with 405 tropical cyclone (TC) formations in the western North Pacific during 1990–2001 are examined in this study. Six large-scale parameters are obtained and computed from the NCEP reanalyses with ...

Kevin K. W. Cheung

2004-02-01T23:59:59.000Z

450

Aerosols in Amazonia: Natural biogenic particles and large scale biomass burning impacts  

Science Conference Proceedings (OSTI)

The Large Scale Biosphere Atmosphere Experiment in Amazonia (LBA) is a long term (20 years) research effort aimed at the understanding of the functioning of the Amazonian ecosystem. In particular

2013-01-01T23:59:59.000Z

451

On the Identification of the Large-Scale Properties of Tropical Convection using Cloud Regimes  

Science Conference Proceedings (OSTI)

The use of cloud regimes in identifying tropical convection and the associated large-scale atmospheric properties is investigated. The regimes are derived by applying cluster analysis to satellite retrievals of daytime-averaged frequency ...

Jackson Tan; Christian Jakob; Todd P. Lane

452

National large-scale Urban True Orthophoto Mapping and its standard initiative  

Science Conference Proceedings (OSTI)

This document would highlight the current project activities, published or unpublished research contributions, success and challenges from March 2005 through December 2005 and plane for the coming years on the project, entitled "National Large-Scale ...

Guoqing Zhou; Wenhan Xie; Susan Benjamin; Robin G. Fegeas; John Simmers; Hap Cluff; Y. Lei; Jeanne Foust

2006-05-01T23:59:59.000Z

453

A Parallel Euler Approach for Large-Scale Biological Sequence Assembly  

Science Conference Proceedings (OSTI)

Biological sequence assembly is an essential step for sequencing the genomes of organisms. Sequence assembly is very computing intensive especially for the large-scale sequence assembly. Parallel computing is an effective way to reduce the computing ...

2005-07-01T23:59:59.000Z

454

Large Scale Soft X-ray Loops And Their Magnetic Chirality In Both Hemispheres  

E-Print Network (OSTI)

The magnetic chirality in solar atmosphere has been studied based on the soft X-ray and magnetic field observations. It is found that some of large-scale twisted soft X-ray loop systems occur for several months in the solar atmosphere, before the disappearance of the corresponding background large-scale magnetic field. It provides the observational evidence of the helicity of the large-scale magnetic field in the solar atmosphere and the reverse one relative to the helicity rule in both hemispheres with solar cycles. The transfer of the magnetic helicity from the subatmosphere is consistent with the formation of large-scale twisted soft X-ray loops in the both solar hemispheres.

Zhang, Hongqi; Gao, Yu; Su, Jiangtao; Sokoloff, D D; Kuzanyan, K

2010-01-01T23:59:59.000Z

455

Impact of Large Scale Energy Efficiency Programs On Consumer Tariffs and Utility Finances in India  

E-Print Network (OSTI)

as sources of low-cost baseload power. 4.6.3 Large­Scale EE b is the variable cost of baseload power purchases, and L isbut simply avoids baseload power purchases. Utilities that

Abhyankar, Nikit

2011-01-01T23:59:59.000Z

456

Summertime Precipitation Variability over South America: Role of the Large-Scale Circulation  

Science Conference Proceedings (OSTI)

The observed large-scale circulation mechanisms associated with summertime precipitation variability over South America are investigated. Particular attention is paid to the Altiplano where a close relationship has been observed between rainfall ...

J. D. Lenters; K. H. Cook

1999-03-01T23:59:59.000Z

457

Sensitivity Study of Regional Climate Model Simulations to Large-Scale Nudging Parameters  

Science Conference Proceedings (OSTI)

Previous studies with nested regional climate models (RCMs) have shown that large-scale spectral nudging (SN) seems to be a powerful method to correct RCMs’ weaknesses such as internal variability, intermittent divergence in phase space (IDPS), ...

Adelina Alexandru; Ramon de Elia; René Laprise; Leo Separovic; Sébastien Biner

2009-05-01T23:59:59.000Z

458

In-situ sampling of a large-scale particle simulation for interactive visualization and analysis  

Science Conference Proceedings (OSTI)

We describe a simulation-time random sampling of a large-scale particle simulation, the RoadRunner Universe MC3 cosmological simulation, for interactive post-analysis and visualization. Simulation data generation rates will continue to be ...

J. Woodring; J. Ahrens; J. Figg; J. Wendelberger; S. Habib; K. Heitmann

2011-06-01T23:59:59.000Z

459

LARGE SCALE PERMEABILITY TEST OF THE GRANITE IN THE STRIPA MINE AND THERMAL CONDUCTIVITY TEST  

E-Print Network (OSTI)

No.2 LARGE SCALE PERMEABILITY TEST OF THE GRANITE' IN THEMINE AND, THERMAL CONDUCTIVITY TEST Lars Lundstrom and HakanSUMMARY REPORT Background TEST SITE Layout of test places

Lundstrom, L.

2011-01-01T23:59:59.000Z

460

Anisotropic mesoscopic traffic simulation approach to support large-scale traffic and logistic modeling and analysis  

Science Conference Proceedings (OSTI)

Large-scale traffic and transportation logistics analysis requires a realistic depiction of network traffic condition in a dynamic manner. In the past decades, vehicular traffic simulation approaches have been increasingly developed and applied to describe ...

Ye Tian; Yi-Chang Chiu

2011-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "large scale wind" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

The Dynamics of Large-Scale Cyclogenesis over the North Pacific Ocean  

Science Conference Proceedings (OSTI)

Earlier studies of persistent large-scale flow anomalies have been extended, with the aim of identifying the primary mechanisms for persistent anomaly development. In this study the focus is on wintertime cases of persistent cyclonic flow ...

Robert X. Black; Randall M. Dole

1993-02-01T23:59:59.000Z

462

Model-constrained optimization methods for reduction of parameterized large-scale systems  

E-Print Network (OSTI)

Most model reduction techniques employ a projection framework that utilizes a reduced-space basis. The basis is usually formed as the span of a set of solutions of the large-scale system, which are computed for selected ...

Bui-Thanh, Tan

2007-01-01T23:59:59.000Z

463

On the Ocean’s Large-Scale Circulation near the Limit of No Vertical Mixing  

Science Conference Proceedings (OSTI)

By convention, the ocean’s large-scale circulation is assumed to be a thermohaline overturning driven by the addition and extraction of buoyancy at the surface and vertical mixing in the interior. Previous work suggests that the overturning ...

J. R. Toggweiler; B. Samuels

1998-09-01T23:59:59.000Z

464

Some Correlations between the Large-Scale Meridional Eddy Momentum Transport and Zonal Mean Quantities  

Science Conference Proceedings (OSTI)

An empirical study has been made which compares the large-scale meridional eddy momentum transport with some selected zonal mean quantities by calculating correlations between them as a function of time lag and latitude. The basic dataset was the ...

Anne Leach

1984-01-01T23:59:59.000Z

465

Influence of Forced Large-Scale Atmospheric Patterns on Surface Air Temperature in China  

Science Conference Proceedings (OSTI)

The seasonality of the influence of the tropical Pacific sea surface temperature (SST)-forced large-scale atmospheric patterns on the surface air temperature (SAT) over China is investigated for the period from 1969 to 2001. Both observations and ...

Xiaojing Jia; Hai Lin

2011-03-01T23:59:59.000Z

466

Explosive Cyclogenesis and Large-Scale Circulation Changes: Implications for Atmospheric Blocking  

Science Conference Proceedings (OSTI)

Large-scale circulation changes attending explosive surface cyclogenesis are quantitatively examined in two cases selected from recent winter seasons. Both cases feature a rapidly deepening surface cyclone over the western Atlantic Ocean, but ...

Stephen J. Colucci

1985-12-01T23:59:59.000Z

467

Tropical Cyclone Track Characteristics as a Function of Large-Scale Circulation Anomalies  

Science Conference Proceedings (OSTI)

Factors that contribute to intraseasonal variability in western North Pacific tropical cyclone track types are investigated. It is hypothesized that the 700-mb large-scale circulation can affect tropical cyclone track characteristics by enhancing ...

Patrick A. Harr; Russell L. Elsberry

1991-06-01T23:59:59.000Z

468

Agent Based Dynamic Service Synthesis in Large-Scale Open Environments: Experiences from the Agentcities Testbed  

Science Conference Proceedings (OSTI)

The notion of autonomous agents populating large-scale open environments, such as the public Internet, that are able to dynamically discover one another, interact and synthesise new software applications or results has become one of the key technology ...

Steven Willmott; Simon Thompson; David Bonnefoy; Patricia Charlton; Ion Constantinescu; Jonathan Dale; Tianning Zhang

2004-07-01T23:59:59.000Z

469

Large-Scale Heat and Moisture Budgets over the ASTEX Region  

Science Conference Proceedings (OSTI)

Rawinsonde data collected from the Atlantic Stratocumulus Transition Experiment (ASTEX) were used to investigate the mean and temporal characteristics of large-scale heat and moisture budgets for a 2-week period in June 1992. During this period a ...

Paul E. Ciesielski; Wayne H. Schubert; Richard H. Johnson

1999-09-01T23:59:59.000Z

470

Dependence of Large-Scale Precipitation Climatologies on Temporal and Spatial Sampling  

Science Conference Proceedings (OSTI)

Large-scale observed precipitation climatologies are needed for a variety of purposes in the fields of climate and environmental modeling. Although new satellite-derived precipitation estimates offer the prospect of near-global climatologies ...

Mike Hulme; Mark New

1997-05-01T23:59:59.000Z

471

Aerosol-Induced Large-Scale Variability in Precipitation over the Tropical Atlantic  

Science Conference Proceedings (OSTI)

Multiyear satellite observations are used to document a relationship between the large-scale variability in precipitation over the tropical Atlantic and aerosol traced to African sources. During boreal winter and spring there is a significant ...

Jingfeng Huang; Chidong Zhang; Joseph M. Prospero

2009-10-01T23:59:59.000Z

472

An Idealized Prototype for Large-Scale Land–Atmosphere Coupling  

Science Conference Proceedings (OSTI)

A process-based, semianalytic prototype model for understanding large-scale land–atmosphere coupling is developed here. The metric for quantifying the coupling is the sensitivity of precipitation P to soil moisture W, . For a range of prototype ...

Benjamin R. Lintner; Pierre Gentine; Kirsten L. Findell; Fabio D’Andrea; Adam H. Sobel; Guido D. Salvucci

2013-04-01T23:59:59.000Z

473

Built-in data-flow integration testing in large-scale component-based systems  

Science Conference Proceedings (OSTI)

Modern large-scale component-based applications and service ecosystems are built following a number of different component models and architectural styles, such as the data-flow architectural style. In this style, each building block receives data from ...

Éric Piel; Alberto Gonzalez-Sanchez; Hans-Gerhard Gross

2010-11-01T23:59:59.000Z

474

Large-Scale Vertical Eddy Diffusion in the Main Pycnocline of the Central North Pacific  

Science Conference Proceedings (OSTI)

Indirect procedures are used to estimate the latitudinal distribution of the large-scale vertical eddy diffusivity coefficient in the main pycnocline from the interannual change in T?, ?? structure of the water column in the central midlatitude ...

Warren White; Robert Bernstein

1981-04-01T23:59:59.000Z

475

Abstract--The use of doubly fed induction generators (DFIGs) in large wind energy conversion systems (WECS) has  

E-Print Network (OSTI)

1 Abstract--The use of doubly fed induction generators (DFIGs) in large wind energy conversion systems (WECS) has significantly increased during the last few years. The DFIG is interfaced to the AC to the AC grid during disturbances. The sensitivity of DFIGs to external faults has motivated researchers

Pota, Himanshu Roy

476

Wind Tunnel Measurements of the Response of Hot-Wire Liquid Water Content Instruments to Large Droplets  

Science Conference Proceedings (OSTI)

Wet wind tunnel tests were performed on more than 23 cloud liquid water content (LWC) probes and drop spectrometers at the NASA Icing Research Tunnel, with a main objective to characterize their response to large-droplet conditions. As a part of ...

J. W. Strapp; J. Oldenburg; R. Ide; L. Lilie; S. Bacic; Z. Vukovic; M. Oleskiw; D. Miller; E. Emery; G. Leone

2003-06-01T23:59:59.000Z

477

Method of Equivalencing for a Large Wind Power Plant with Multiple Turbine Representation: Preprint  

DOE Green Energy (OSTI)

This paper focuses on our effort to develop an equivalent representation of a Wind Power Plant collector system for power system planning studies.

Muljadi, E.; Pasupulati, S.; Ellis, A.; Kosterov, D.

2008-07-01T23:59:59.000Z

478

Integration of large wind farms into utility grids (Part 1—Modeling  

E-Print Network (OSTI)

Abstract—In this part of the paper the authors describe a newly developed model for doubly-fed induction wind generators (DFIG) that is suitable for transient stability studies. In this model the main performance characteristics of DFIG are included. The model is validated against a more detailed EMTPlevel model of such generation. The results suggest that the stability model has sufficient accuracy for representation of the electromechanical dynamics of interest in simulation studies for identifying critical operating conditions. Further analysis of these critical conditions may require the use of more detailed EMTP-level models. Index Terms — Wind turbine generators, wind energy, modeling wind farms. I.

Rodolfo J. Koessler; Senior Member; Srinivas Pillutla; Lan H. Trinh; David L. Dickm

2003-01-01T23:59:59.000Z

479

Monitoring and Regression Based Modelling of End Winding Vibration in Large Synchronous Generators.  

E-Print Network (OSTI)

?? This research project was set up to monitor, on an ongoing basis, the condition of the end windings and their support structures of a… (more)

Shally, David, [Thesis

2012-01-01T23:59:59.000Z

480

Large Eddy Simulation of Wind Loads on a Low-Rise ...  

Science Conference Proceedings (OSTI)

... Dynamics (CFD), referred as virtual wind tunnel ... Tunnel Laboratory of the University of Western ... dynamic Smagorinsky-Lilly model does implement a ...

2013-07-24T23:59:59.000Z

Note: This page contains sample records for the topic "large scale wind" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Equivalencing the Collector System of a Large Wind Power Plant: Preprint  

DOE Green Energy (OSTI)

This paper focuses on our effort to develop an equivalent representation of a wind power plant collector system for power system planning studies.

Muljadi, E.; Butterfield, C. P.; Ellis, A.; Mechenbier, J.; Hochheimer, J.; Young, R.; Miller, N.; Delmerico, R.; Zavadil, R.; Smith, J. C.

2006-01-01T23:59:59.000Z

482

Nuclear EMP simulation for large-scale urban environments. FDTD for electrically large problems.  

SciTech Connect

In case of a terrorist nuclear attack in a metropolitan area, EMP measurement could provide: (1) a prompt confirmation of the nature of the explosion (chemical or nuclear) for emergency response; and (2) and characterization parameters of the device (reaction history, yield) for technical forensics. However, urban environment could affect the fidelity of the prompt EMP measurement (as well as all other types of prompt measurement): (1) Nuclear EMP wavefront would no longer be coherent, due to incoherent production, attenuation, and propagation of gamma and electrons; and (2) EMP propagation from source region outward would undergo complicated transmission, reflection, and diffraction processes. EMP simulation for electrically-large urban environment: (1) Coupled MCNP/FDTD (Finite-difference time domain Maxwell solver) approach; and (2) FDTD tends to be limited to problems that are not 'too' large compared to the wavelengths of interest because of numerical dispersion and anisotropy. We use a higher-order low-dispersion, isotropic FDTD algorithm for EMP propagation.

Smith, William S. [Los Alamos National Laboratory; Bull, Jeffrey S. [Los Alamos National Laboratory; Wilcox, Trevor [Los Alamos National Laboratory; Bos, Randall J. [Los Alamos National Laboratory; Shao, Xuan-Min [Los Alamos National Laboratory; Goorley, John T. [Los Alamos National Laboratory; Costigan, Keeley R. [Los Alamos National Laboratory

2012-08-13T23:59:59.000Z

483

Segmented Ultralight Pre-Aligned Rotor for Extreme-Scale Wind Turbines  

SciTech Connect

To alleviate the mass-scaling issues associated with conventional upwind rotors of extreme-scale turbines, a downwind rotor concept is proposed which employs fixed blade curvature based on force alignment at rated conditions. For a given peak stress constraint, the reduction in downwind cantilever loads allows reduced shell and spar thickness, and thus a reduced blade mass as compared with a conventional upwind rotor, especially as rotor sizes approach extreme-scales. To quantify this mass reduction, a Finite Element Analysis was conducted for a 10 MW rated rotor based on the NREL offshore 5 MW baseline wind turbine. The results show that this 'pre-alignment' yields a net downstream deflection of 32 deg, a downward hub-pitch angle of 6 deg, a 20% increase in blade length (to maintain the same radius as the conventional blade), and a net mass savings of about 50% through decreased shell and spar thicknesses. The pre-alignment may also allow a more straightforward and efficient segmentation of the blade since shear stresses near joints are substantially reduced. Segmenting, in turn, can dramatically reduce costs associated with fabrication, transport and assembly for extreme-scale off-shore systems. The pre-aligned geometric curvature can also help alleviate tower wake effects on the blades since blade tips (where shadow effects can be most problematic) are shifted downstream where the tower wake is weaker. In addition, the portion of the tower that is upstream of the blade tips can be faired with an externally-rotating aerodynamic shroud. Furthermore, the downwind rotor can allow a floating off-shore tri-pod platform to reduce tower weight and yaw-control requirements. A simple economic analysis of the segmented ultralight pre-aligned rotor (SUPAR) concept suggests that the overall system cost savings can be as much as 25%, indicating that more detailed (numerical and experimental) investigations are warranted.

Loth, E.; Steele, A.; Ichter, B.; Selig, M.; Moriarty, P.

2012-01-01T23:59:59.000Z

484

Design of large-scale agricultural wireless sensor networks: email from the vineyard  

Science Conference Proceedings (OSTI)

We describe the design and implementation of a large-scale Wireless Sensor Network (WSN) for agriculture monitoring. As a part of validation we have deployed a prototype of 64 sensors to monitor a commercial vineyard. The system provides ... Keywords: WSN testbed, agricultural WSNs, agriculture monitoring, commercial vineyards, data collection, data storage, geographical coverage, large-scale WSNs, spatial resolution, vineyeard monitoring, wireless