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Volume III of this study discusses major features of the Darrieus vertical-axis wind turbine design including the blades, the speed increaser, guy cables and cable anchors, transmission, clutch, brakes, and the electrical system. System weight characteristics are tabulated. The report discusses operations of the point designs for 120, 200, 500, and 1600-kW Darrieus vertical-axis wind-energy systems. These same point designs are used for the detailed economic analyses discussed in Volume IV.
The A.T. Kearney and Alcoa economic studies are two independent attempts to assess the installed costs of a series of six Darrieus vertical axis wind turbine designs. The designs cover a wide range of sizes with peak outputs from 10 to 1600 kW. All are designed to produce utility grid electrical power. Volume IV of this report summarizes, compares, and analyzes the results of these studies. The Kearney and Alcoa final reports are included in the Appendices.
The A.T. Kearney and Alcoa economic studies are two independent attempts to assess the installed costs of a series of six Darrieus vertical axis wind turbine designs. The designs cover a wide range of sizes with peak outputs from 10 to 1600 kW. All are designed to produce utility grid electrical power. Volume IV of this report summarizes, compares, and analyzes the results of these studies. The Kearney and Alcoa final reports are included in the Appendices.
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 program through FY 1977 toward the achievement of these goals. It also outlines the program's general organization and specific program elements.
The use of numerical methods to predict wind loads on structures is explored. It is concluded that useful engineering results can be obtained numerically, at reasonable cost, for many different problems. However, it is also shown that a considerable amount of new methodology is needed before numerical methods can be of general utility for wind engineering purposes. These conclusions are based on studies performed with a simple numerical solution algorithm for the time-dependent, three-dimensional, Navier-Stokes equations. Calculational results are presented for a variety of simple structures subjected to uniform and boundary layer type winds. In each example the computer results are compared with wind tunnel data.
A detailed description of the method of bins, a technique of data collection and reduction for field performance evaluation of Wind Energy Conversion Systems (WECS) is provided. The method of bins is a straightforward yet useful approach to the complex problem of relating the response of a WECS to a variable wind field. Examples of typical results obtained using the method of bins are presented. Methods of determining that the measure of performance of a WECS obtained is correct are outlined. Areas in which further modifications to the technique may be appropriate are also discussed.
Within the Federal Wind Energy Program, the Wind Characteristics Program Element (WCPE) is a service element established to provide the appropriate wind characteristics information to those involved in energy program planning, design and evaluation of wind energy conversion systems (WECS), selection of sites for the installation of WECS, and the operation of WECS. The program contributions are to consist of reliable estimates of wind characteristics pertinent to WECS design, effective analyses and methods for the determination of wind energy potential over large areas, dependable and cost-effective methodologies for the siting of WECS, and descriptions of the day-to-day variability and predictability of wind energy for WECS operations. To accomplish these goals, the WCPE has been divided into four technical program areas: wind characteristics for design and performance evaluation; mesoscale wind characteristics; development of siting methodologies; and wind characteristics for WECS operations.
Highlights of the recent progress in understanding the problem of high speed stream evolution with increasing heliocentric distance are reviewed. Crucial to this understanding are the measurements made in the inner solar system by Helios and the outer solar system by Pioneers 10 and 11. When coupled with observations at 1 AU these measurements allow a testing of current theoretical models of stream evolution. 21 references.
A limited program of field measurements was undertaken in order to define the wind characteristics of the DOE/Sandia vertical axis wind turbine test facility. Because micrometeorological conditions under which a particular wind turbine is tested may have an effect on the performance of that turbine, it is important that these conditions be properly documented. The mean velocity profile, longitudinal and lateral turbulence intensities, longitudinal velocity spectra, and cross correlations between the velocities at s -3lect locations were measured for a representative sample of incident winds. These measurements are summarized in a form which should facilitate comparison with other sites.
A limited program of field measurements was undertaken in order to define the wind characteristics of the DOE/Sandia vertical axis wind turbine test facility. Because micrometeorological conditions under which a particular wind turbine is tested may have an effect on the performance of that turbine, it is important that these conditions be properly documented. The mean velocity profile, longitudinal and lateral turbulence intensities, longitudinal velocity spectra, and cross correlations between the velocities at s -3lect locations were measured for a representative sample of incident winds. These measurements are summarized in a form which should facilitate comparison with other sites.

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