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Estimates of the number of large amplitude gusts

Description: Preliminary estimates are presented of the number of occurrences of large amplitude gusts for use in the design of wind energy conversion systems. Existing turbulence information has been combined with an assumed wind speed distribution to arrive at the estimates. The number of large amplitude gusts per year is treated as a function of the annual mean wind speed and terrain roughness. This treatment is based upon the assumptions that the atmosphere has neutral stability during high winds and th… more
Date: March 1, 1978
Creator: Ramsdell, J.V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Measurement program to characterize the wind at a potential WECS site

Description: An onsite meteorological measurement program to characterize the wind at a potential wind turbine installation site is described. The basic informational requirements have been postulated, the analysis described, and an appropriate measurement program has been devised. This phase of siting measurements provides the information for the final installation decision process--which WECS to put at which site.
Date: March 1, 1978
Creator: Verholek, M.G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Innovative wind turbines. Circulation controlled vertical axis wind turbine. Progress report, March 1-December 31, 1976

Description: Theoretical and experimental research efforts in evaluating an innovative concept for vertical axis wind turbines (VAWT) are described. The concept is that of using straight blades composed of circulation controlled airfoil sections. The theoretical analysis has been developed to determine the unsteady lift and moment characteristics of multiple-blade cross-flow wind turbines. To determine the drag data needed as input to the theoretical analysis, an outdoor test model VAWT has been constructed… more
Date: October 1, 1978
Creator: Walters, R. E.; Fanucci, J. B.; Hill, P. W.; Migliore, P. G.; Squire, W. & Waltz, T. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Wind energy conversion. Volume X. Aeroelastic stability of wind turbine rotor blades

Description: The nonlinear equations of motion of a general wind turbine rotor blade are derived from first principles. The twisted, tapered blade may be preconed out of the plane of rotation, and its root may be offset from the axis of rotation by a small amount. The aerodynamic center, center of mass, shear center, and area centroid are distinct in this derivation. The equations are applicable to studies of forced response or of aeroelastic flutter, however, neither gravity forcing, nor wind shear and gus… more
Date: September 1, 1978
Creator: Wendell, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Free wake analysis of wind turbine aerodynamics. Wind energy conversion. ASRL-TR-184-14

Description: The underlying theory is presented for determining blade and rotor/tower vibration and dynamic stability characteristics as well as the basic dynamic (as opposed to aerodynamic) operating loads. Starting with a simple concept of equivalent hinged rotors, the equations of motion for the blade including pitch, flap and lag motions are developed. The nonlinear equations are derived first and linearized about a finite displacement of the blade out of the plane of rotation. This is important since w… more
Date: September 1, 1978
Creator: Gohard, J.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

First semiannual report: Rocky Flats Small Wind Systems Test Center activities. Volume I. Description of the National Small Wind Systems Test Center

Description: Information is presented concerning the Rocky Flats wind turbine test site; the philosophy of testing at Rocky Flats; test procedure development; atmospheric SWECS testing; SWECS component testing; data collection, handling, and analysis; reporting procedures; and future plans.
Date: September 28, 1978
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analysis of the Madaras Rotor Power Plant: an alternate method for extracting large amounts of power from the wind. Volume 2. Technical report

Description: The purpose of the program was to analyze and up-date the design of the Madaras Rotor Power Plant concept that had been developed in the 1930's to determine the technical and economic feasibility of this system to be competitive with conventional horizontal axis wind turbines. A four-task program consisting of a series of wind tunnel tests, an electro-mechanical analysis, a performance analysis, and a cost analysis was conducted.
Date: June 1, 1978
Creator: Whitford, D. H.; Minardi, J. E.; West, B. S. & Dominic, R. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Economic incentives to wind systems commercialization. Final report

Description: This assessment of Economic Incentives to Wind Systems Commercialization is an analysis of the quantitative and qualitative impacts of a variety of Government funded economic incentives on Wind Energy Conversion Systems (WECS). The purpose of this study is to achieve better understanding of the relationship between implementation of specific economic incentives for WECS, and the factors surrounding WECS commercial introduction.
Date: August 1, 1978
Creator: Lotker, M.; Shaw, Jr, R. W.; Adolfson, W. F.; Bernardi, R. P.; Davidoff, P. H.; Eckhart, M. T. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Wind energy conversion. Volume IX. Aerodynamics of wind turbine with tower disturbances

Description: Lifting line theory which is the counterpart of Prandtl's lifting line theory for rotating wing is employed for the overall performance analysis of a horizontal axis wind turbine rotor operating in a uniform flow. The wake system is modeled by non-rigid wake which includes the radial expansion and the axial retardation of trailing vortices. For the non-uniform flow which are caused by the ground, the tower reflection, or the tower shadow, the unsteady airloads acting on the turbine blade are co… more
Date: September 1, 1978
Creator: Chung, S.Y.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Design of a self-regulating composite bearingless blade wind turbine. Final report, October 15, 1976-August 15, 1977

Description: A study was undertaken to design a 40-ft diameter wind turbine employing the UTRC/ERDA Self-Regulating Composite Bearingless Rotor (CBR) concept. The CBR concept was developed at United Technologies for rotary wing applications and is now in use on Sikorsky helicopters. The concept was further developed for wind turbine applications at UTRC under an ERDA contract in 1975-76. Successful wind tunnel tests were conducted during that contract, which demonstrated the self-starting and self-regulatin… more
Date: January 1, 1978
Creator: Spierings, P.A.M. & Cheney, M.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Analysis of the Madaras Rotor Power Plant: an alternate method for extracting large amounts of power from the wind. Executive summary

Description: The purpose of the program was to analyze and up-date the design of the Madaras Rotor Power Plant concept that had been developed in the 1930's to determine the technical and economic feasibility of this system to be competitive with conventional horizontal axis wind turbines. The Madaras concept uses rotating cylinders, vertically mounted on flat cars, to react with the wind like a sail and propel an endless train of connected cars around a closed track at constant speed. Electricity is genera… more
Date: June 1, 1978
Creator: Whitford, D. H.; Minardi, J. E.; West, B. S. & Dominic, R. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Estimation of wind characteristics at potential wind energy conversion sites. Volume 1. Technical report

Description: To achieve the DOE goal of placing the most economically viable wind energy conversion system at a site, it becomes necessary to determine the accuracy of the climatology development technique, and to determine the extent of its applicability to sites of differing geographic settings and data station locations. To achieve this goal, the Climatology Development Methodology was applied to eight candidate wind energy sites of differing site geographic settings and data station locations. The perfo… more
Date: March 1, 1978
Creator: Howard, S. M. & Chen, P. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Annual report of the Wind Characteristics Program Element for the period July 1977--July 1978.

Description: Information is presented concerning wind characteristics for design and performance evaluations; mesoscale wind characteristics; siting methodologies; and wind characteristics for WECS operations.
Date: December 1, 1978
Creator: Wendell, L. L.; Connell, J. R.; Pennell, W. T.; Renne, D. S. & Wegley, H. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

First semiannual report: Rocky Flats Small Wind Systems Test Center activities. Volume II. Experimental data collected from small wind energy conversion systems

Description: Volume II of the First Semiannual Report of the Rocky Flats Small Wind Systems Test Center (WSTC) describes the nine (9) small wind energy conversion systems (SWECS) tested as of June 30, 1978 and provides the significant quantitative and qualitative data collected to that date. Meteorological data collected at Rocky Flats are also provided and described.
Date: September 28, 1978
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Applied research on energy storage and conversion for photovoltaic and wind energy systems. Volume III. Wind conversion systems with energy storage. Final report

Description: The variability of energy output inherent in wind energy conversion systems (WECS) has led to the investigation of energy storage as a means of managing the available energy when immediate, direct use is not possible or desirable. This portion of the General Electric study was directed at an evaluation of those energy storage technologies deemed best suited for use in conjunction with a wind energy conversion system in utility, residential and intermediate applications. Break-even cost goals ar… more
Date: January 1, 1978
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Reliability of wind power from dispersed sites: a preliminary assessment

Description: The reliability benefit of geographically dispersed wind turbine generators is analyzed. Electricity produced from wind machines experiences wide fluctuations of output at a given site. Yet the value of electricity is a function of its reliability. Pricing schedules have traditionally valued firm power, that is, reliably available power, much more highly than ''dump power;'' that is, power which is available intermittently on an ''if and when'' basis. The conventional wisdom on wind power sugge… more
Date: April 1, 1978
Creator: Kahn, E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Simulation of the hourly wind speeds for randomly dispersed sites

Description: A technique is presented which simulates the hourly wind speeds at any number of dispersed sites within a region. The required input for the simulation is an hourly wind speed record from a single ''representative site'' and an estimation of the size of the region in which the sites will be located. This technique is not intended for use at any specific location but rather intended to be used for generic mission analysis type studies.
Date: May 1, 1978
Creator: Cliff, W. C.; Justus, C. G. & Elderkin, C. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Wind velocity-change (gust rise) criteria for wind turbine design

Description: A closed-form equation is derived for root mean square (rms) value of velocity change (gust rise) that occurs over the swept area of wind turbine rotor systems and an equation for rms value of velocity change that occurs at a single point in space. These formulas confirm the intuitive assumption that a large system will encounter a less severe environment than a small system when both are placed at the same location. Assuming a normal probability density function for the velocity differences, a… more
Date: July 1, 1978
Creator: Cliff, W. C. & Fichtl, G. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Federal Wind Energy Program. Program summary. [USA]

Description: The objective of the Federal Wind Energy Program is to accelerate the development of reliable and economically viable wind energy systems and enable the earliest possible commercialization of wind power. To achieve this objective for small and large wind systems requires advancing the technology, developing a sound industrial technology base, and addressing the non-technological issues which could deter the use of wind energy. This summary report outlines the projects being supported by the pro… more
Date: January 1, 1978
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Verification statistic for numerical wind models

Description: A generalized wind estimate based on a limited number of uncertain field measurements is computed at each point in a given geographical region. A point-by-point comparison with a numerical model prediction of the wind field is then described. This comparison results in numerical assessments of the probability that the model succeeded in predicting the actual wind field and that the field measurements contain sufficient information on which to base such a comparison.
Date: September 1, 1978
Creator: Kerrigan, T.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Solar Energy: Its Technologies and Applications

Description: Solar heat, as a potential source of clean energy, is available to all of us. Extensive R and D efforts are being made to effectively utilize this renewable energy source. A variety of different technologies for utilizing solar energy have been proven to be technically feasible. Here, some of the most promising technologies and their applications are briefly described. These are: Solar Heating and Cooling of Buildings (SHACOB), Solar Thermal Energy Conversion (STC), Wind Energy Conversion (WECS… more
Date: June 1, 1978
Creator: Auh, P. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Guide to commercially available wind machines

Description: Wind Energy Conversion Systems (WECS) commercially available in the United States are described. The terms used to describe these wind systems are defined and their significance discussed. Lists of manufacturers and distributors, subsystem components and suppliers, and references are provided.
Date: April 3, 1978
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Wind power for farms, homes, and small industry

Description: Information is presented concerning basic wind turbine energy conversion; wind behavior and site selection; power and energy requirements; the components of a wind energy conversion system; selecting a wind energy conversion system and system economics; and legal aspects.
Date: September 1, 1978
Creator: Park, J. & Schwind, D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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