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open access

Renewable energy data requirements: A review of user opinions and data collection efforts

Description: Interest in the contribution of renewable energy to US energy supply is growing. This interest stems from environmental and energy security concerns and the desire to develop domestic resources. In order to plan for the use of renewable energy, data are essential to a variety of users both inside and outside the government. The purpose of this study is to identify priorities and requirements for gathering different types of renewable energy data. Results of this study are to be used by the US D… more
Date: November 1, 1991
Creator: Stevenson, G.G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Cost of Federal tax credit programs to develop the market for industrial solar and wind energy technologies. Final report to Lawrence Livermore Laboratory, University of California. Volume 2: appendices

Description: A study was made to estimate the impact tax credits (from Acts passed by Congress) would have on renewable energy investment and to estimate the net costs to the US Treasury of providing these tax credits. The appendices to this study are presented. Some investment and marketing penetration worksheets are presented on wind turbines, solar ponds, flat plates, evacuated tubes, and parabolic troughs. A market penetration and economic analysis program with test written for TI-59 programmable calcul… more
Date: November 12, 1981
Creator: Downey, W.T.; Carey, H.; Dlott, E.; Frantzis, L.; McDonald, M.; Myer, L. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Television interference measurements near the MOD-2 WT array at Goodnoe Hills, Washington

Description: Electromagnetic interference to television reception caused by the MOD-2 wind turbine (WT) array at Goodnoe Hills, Washington, was studied by means of detailed measurements at a number of test sites in the vicinity of the WT array. The commercial television signals available in the area were used as the radio frequency sources during the measurements. The dynamic measurements indicated that varying amounts of TVI were produced at all sites and on some or all of the available TV channels; with t… more
Date: November 1, 1983
Creator: Sengupta, D L; Senior, T B.A. & Ferris, J E
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Financial problems facing the manufacturers of small wind energy conversion systems. Final report

Description: The financial barriers faced by the manufacturers of small wind energy conversion systems (SWECS) are assessed and found to be similar to those faced by other start up businesses. However, these problems are found to be aggravated by the high expectations for accelerated SWECS industry growth in the face of moderate government support and lack of investment capital. The underlying conditions of limited SWECS entrepreneur business experience, the highly competitive venture capital market, the in… more
Date: November 1, 1979
Creator: Bolle, T G
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

TX-100 manufacturing final project report.

Description: This report details the work completed under the TX-100 blade manufacturing portion of the Carbon-Hybrid Blade Developments: Standard and Twist-Coupled Prototype project. The TX-100 blade is a 9 meter prototype blade designed with bend-twist coupling to augment the mitigation of peak loads during normal turbine operation. This structural coupling was achieved by locating off axis carbon fiber in the outboard portion of the blade skins. The report will present the tooling selection, blade produc… more
Date: November 1, 2007
Creator: Ashwill, Thomas D. & Berry, Derek S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Distributed Wind Market Applications

Description: Distributed wind energy systems provide clean, renewable power for on-site use and help relieve pressure on the power grid while providing jobs and contributing to energy security for homes, farms, schools, factories, private and public facilities, distribution utilities, and remote locations. America pioneered small wind technology in the 1920s, and it is the only renewable energy industry segment that the United States still dominates in technology, manufacturing, and world market share. The … more
Date: November 1, 2007
Creator: Forsyth, T. & Baring-Gould, I.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Atmospheric Dispersion Model Validation in Low Wind Conditions

Description: Atmospheric plume dispersion models are used for a variety of purposes including emergency planning and response to hazardous material releases, determining force protection actions in the event of a Weapons of Mass Destruction (WMD) attack and for locating sources of pollution. This study provides a review of previous studies that examine the accuracy of atmospheric plume dispersion models for chemical releases. It considers the principles used to derive air dispersion plume models and looks a… more
Date: November 1, 2007
Creator: Sawyer, Patrick
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Wind system value analysis for electric utilities: a comparison of four methods

Description: There have been several studies of how much Wind Energy Conversion Systems (WECS) are worth to electric utilities. When attempting to compare the different results of these studies, questions arose concerning the effect of the different methodologies and models on the determined WECS values. This paper will report on the only known effort that used more than a single methodology for the value analysis of WECS to a specific utility. This paper will present and compare the WECS utility value anal… more
Date: November 1, 1981
Creator: Harper, J.; Percival, D. & Flaim, T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Weather pattern climatology of the Great Plains and the related wind regime

Description: The meteorology of the Great Plains can be described as a constant progression of air masses, fronts and cyclonic storm systems. Each of these meteorological conditions can be characterized by identifiable isobaric and related weather parameter patterns. Nine such patterns have been defined to type the weather patterns in the Great Plains. Time series of weather pattern types were produced for 62 stations on the Great Plains. Statistical analyses of these time series produced annual and seasona… more
Date: November 1, 1982
Creator: Barchet, W. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Computer subroutine for estimating aerodynamic blade loads on Darrieus vertical axis wind turbines. [FORCE code]

Description: An important aspect of structural design of the Darrieus rotor is the determination of aerodynamic blade loads. This report describes a load generator which has been used at Sandia for quasi-static and dynamic rotor analyses. The generator is based on the single streamtube aerodynamic flow model and is constructed as a FORTRAN IV subroutine to facilitate its use in finite element structural models. Input and output characteristics of the subroutine are described and a complete listing is attach… more
Date: November 1, 1980
Creator: Sullivan, W. N. & Leonard, T. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Using the NOABL flow model and mathematical optimization as a micrositing tool

Description: This report describes the use of an improved mass-consistent model that is intended for diagnosing wind fields in complex terrain. The model was developed by merging an existing mass-consistent model, the NOABL model, with an optimization procedure. The optimization allows objective calculation of important model input parameters that previously had been supplied through guesswork; in this manner, the accuracy of the calculated winds has been greatly increased. The report covers such topics as … more
Date: November 1, 1986
Creator: Wegley, H. L. & Barnard, J. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Review of gust model concepts

Description: Within the past two years Pacific Northwest Laboratory (PNL) has been associated directly or indirectly with several documents in which the authors set forth their concept of a wind component gust model. In this paper three models, each representing a somewhat different concept, are reviewed. A gust model can be defined as a mathematical model that begins by describing wind fluctuations in terms of discrete events and ends by defining statistics of those events. In the present models, all wind … more
Date: November 1, 1979
Creator: Powell, D.C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Estimation of turbulence level and scale for wind turbine applications

Description: 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 … more
Date: November 1, 1988
Creator: Powell, D.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Wind energy resource atlas. Volume 9. The Southwest Region

Description: This atlas of the wind energy resource is composed of introductory and background information, a regional summary of the wind resource, and assessments of the wind resource in Nevada and California. Background on how the wind resource is assessed and on how the results of the assessment should be interpreted is presented. A description of the wind resource on a regional scale is then given. The results of the wind energy assessments for each state are assembled into an overview and summary of t… more
Date: November 1, 1980
Creator: Simon, R. L.; Norman, G. T.; Elliott, D. L.; Barchet, W. R. & George, R. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

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

Description: 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 … more
Date: November 1, 1993
Creator: Kelley, N. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Full vector (3-D) inflow simulation in natural and wind farm environments using an expanded version of the SNLWIND (Veers) turbulence code

Description: We have recently expanded the numerical turbulence simulation (SNLWIND) developed by Veers [1] to include all three components of the turbulent wind vector. We have also configured the code to simulate the characteristics of turbulent wind fields upwind and downwind of a large wind farm, as well as over uniform, flat terrain. Veers`s original method only simulates the longitudinal component of the wind in neutral flow. This paper overviews the development of spectral distribution, spatial coher… more
Date: November 1, 1992
Creator: Kelley, N. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Testing composite-to-metal tubular lap joints

Description: Procedures were developed to fabricate, nondestructively evaluate, and mechanically test composite-to-metal tubular joints. The axially loaded tubular lap joint specimen consisted of two metal tubes bonded within each end of a fiberglass composite tube. Joint specimens with both tapered and untapered aluminum adherends and a plain weave E-glass/epoxy composite were tested in tension, compression, and flexure. Other specimens with tapered and untapered steel adherends and a triaxially reinforced… more
Date: November 1, 1993
Creator: Guess, T. R.; Reedy, E. D. Jr. & Slavin, A. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Using digital filtering techniques as an aid in wind turbine data analysis

Description: Research involving very large sets of digital data is often difficult due to the enormity of the database. In the case of a wind turbine operating under varying environmental conditions, determining which data are representative of the blade aerodynamics and which are due to transient flow ingestion effects or errors in instrumentation, operation, and data collection is of primary concern to researchers. The National Renewable Energy Laboratory in Golden, Colorado collected extensive data on a … more
Date: November 1, 1994
Creator: Young, T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Analysis/test correlation using VAWT-SDS on a step-relaxation test for the rotating Sandia 34 m test bed

Description: The combined analysis/test effort described in this paper compares predictions with measured data from a step-relaxation test in the absence of significant wind-driven aerodynamic loading. The process described here is intended to illustrate a method for validation of time domain codes for structural analysis of wind turbine structures. Preliminary analyses were performed to investigate the transient dynamic response that the rotating Sandia 34 m Vertical Axis Wind Turbine (VAWT) would undergo … more
Date: November 1, 1993
Creator: Argueello, J. G.; Dohrmann, C. R.; Carne, T. G. & Veers, P. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

RPM-SIM-Based Analysis of Power Converter Applications in Renewable Energy Systems: Preprint

Description: This paper briefly presents the RPM-SIM simulator and, in particular, its abilities to simulate and analyze renewable energy systems with power converters. This modular simulation system is used to study applications and cost-effective performance of renewable energy systems, analyze both static and dynamic performance, develop control strategies, and simulate autonomous renewable energy systems under different generation and load conditions (such as different wind speeds, temperature, insolati… more
Date: November 1, 2001
Creator: Bialasiewicz, J. T.; Muljadi, E. & Nix, R. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Analysis and Comparison of Test Results from the Small Wind Research Turbine Test Project: Preprint

Description: Most small wind turbines furl (yaw or tilt out of the wind) as a means of limiting power and rotor speeds in high winds. The Small Wind Research Turbine (SWRT) testing project was initiated in 2003 with the goal of better characterizing both small wind turbine loads (including thrust) and dynamic behavior, specifically as they relate to furling. The main purpose of the testing was to produce high-quality data sets for model development and validation and to help the wind industry further their … more
Date: November 1, 2004
Creator: Corbus, D. & Prascher, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Hybrid Power System with a Controlled Energy Storage: Preprint

Description: We investigated a small isolated hybrid power system that used two types of power generation; wind turbine and diesel generation. The interaction of diesel generation, the wind turbine, and the local load is complicated because both the load and the wind turbine fluctuate during the day. These fluctuations create imbalances in power distribution (energy sources are not equal to energy sinks) that can affect the frequency and the voltage in the power system. The addition of energy storage will h… more
Date: November 1, 2003
Creator: Muljadi, E. & Bialasiewicz, J. T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Wind Turbine Response to Analytic Inflow Vortex Parameters Variation: Preprint

Description: As larger wind turbines are placed on taller towers, rotors frequently operate in atmospheric conditions that support organized, coherent turbulent structures. It is hypothesized that these structures have a detrimental impact on the blade fatigue life experienced by the wind turbine. These structures are extremely difficult to identify with sophisticated anemometry such as ultra-sonic anemometers. In order to ascertain the idealized worst-case scenario for vortical inflow structures impinging … more
Date: November 1, 2003
Creator: Hand, M. M.; Robinson, M. C. & Balas, M. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Offshore Wind Turbines - Estimated Noise from Offshore Wind Turbine, Monhegan Island, Maine: Environmental Effects of Offshore Wind Energy Development

Description: Deep C Wind, a consortium headed by the University of Maine will test the first U.S. offshore wind platforms in 2012. In advance of final siting and permitting of the test turbines off Monhegan Island, residents of the island off Maine require reassurance that the noise levels from the test turbines will not disturb them. Pacific Northwest National Laboratory, at the request of the University of Maine, and with the support of the U.S. Department of Energy Wind Program, modeled the acoustic outp… more
Date: November 23, 2010
Creator: Aker, Pamela M.; Jones, Anthony M. & Copping, Andrea E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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