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Download e-book for iPad: Advances in Energy Systems and Technology. Volume 1 by Peter Auer (Auth.)

By Peter Auer (Auth.)

ISBN-10: 012014901X

ISBN-13: 9780120149018

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Extra resources for Advances in Energy Systems and Technology. Volume 1

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Widger (1976) developed a method of calculating wind power values from average wind speeds only, which was simple and appeared to have considerable value if generally valid. His results were based on records from six New England stations spread over four states using a linear relation between average and fastest wind speeds and normalizing the usual skewed distribution by a square root transformation. From comparing computed results for power output based on these theoretical values with the values calculated from the actual distributions, he concluded that his generalized tables and graph gave results within ±20%.

Will be discussed later. V. WIND ENERGY CONCENTRATORS AND AUGMENTORS With one of the prime features of freestream wind energy being its low energy density, considerable attention has been given to forms of turbines which operate with this available energy concentrated into a smaller cross-sectional flow area. A similar state of affairs occurs with direct solar energy, where parabolic and other geometries are used to overcome the low specific energy capacity of flat-plate collectors. The idea is not new (it is apparent in the slanted entry of primitive Persian paddle-wheel windmills) but has received increasing attention in the immediate past few years.

There is a similarity of shape and this can be put on a comparative basis by normalizing through division by the average wind speed, Fig. 36 (Lapin, 1976). Thus it is possible to construct an approximate velocityduration curve from a value of mean wind speed only, if detailed data are lacking. Other ways of showing this distribution data are by a frequency curve, with duration in hours per years or fractionally as ordinate against 70 ΜΥΝΥ00 ANELOG ( N. WALES ) 29-0 MPH 0 KXX) 2000 3000 4000 5000 6000 7000 8000 8760 HOURS IN THE YEAR Fig.

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Advances in Energy Systems and Technology. Volume 1 by Peter Auer (Auth.)


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