Frequency Distributions for Hourly and Daily Clearness Indices

[+] Author and Article Information
Manuel Ibañez

Dept. de Medi Ambient i Ciències del Sòl, Universitat de Lleida, Av. Rovira Roure 177, E25198-Lleida, Spaine-mail: m.ibanez@macs.udl.es

William A. Beckman, Sanford A. Klein

Solar Energy Laboratory, University of Wisconsin-Madison, Madison, WI 53706

J. Sol. Energy Eng 124(1), 28-33 (Jul 01, 2001) (6 pages) doi:10.1115/1.1445443 History: Received November 01, 2000; Revised July 01, 2001
Copyright © 2002 by ASME
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Duffie, J. A., and Beckman, W. A., 1991, Solar Engineering of Thermal Processes, 2nd Ed., John Wiley & Sons, New York.
Klein,  S. A., and Beckman,  W. A., 1994, “Review of Solar Radiation Utilizability,” Sol. Energy, 106, pp. 393–402.
Liu,  B. Y. H., and Jordan,  B. C., 1960, “The Interrelationship and Characteristic Distribution of Direct, Difuse and Total Solar Radiation,” Sol. Energy, 4, pp. 1–19.
Bendt,  P., Collares-Pereira,  M., and Rabl,  A., 1981, “The Frequency Distribution of Daily Insolation Values,”s Sol. Energy, 27, pp. 1–5.
Hollands,  K. G. T., and Huget,  R. G., 1983, “A Probability Density Function for the Clearness Index, with Applications,” Sol. Energy, 30, pp. 195–209.
Saunier,  G. Y., Reddy,  T. A., and Kumar,  S. A., 1987, “A Monthly Probability Distribution Function of Daily Global Irradiation Values Appropriate for Both Tropical and Temperature Locations,” Sol. Energy, 38, pp. 169–177.
Ideriah,  F. J. K., and Suleman,  S. O., 1989, “Sky Conditions at Ibadan During 1975–1980,” Sol. Energy, 43, 325–330.
Akuffo,  F. O., and Brew-Hammond,  A., 1993, “The Frequency Distribution of Global Solar Irradiation at Kumasi,” Sol. Energy, 550, 145–154.
Udo,  S. O., 2000, “Sky Conditions at Ilorin as Characterized by Clearness Index and Relative Sunshine,” Sol. Energy, 69, pp. 45–53.
Babu,  K. S., and Satyamurty,  V. V., 2001, “Frequency Distribution of Daily Clearness Indices Through Generalized Parameters,” Sol. Energy, 70, 35–43.
Suehrcke,  H., and McCormick,  P. G., 1988, “The Frequency Distribution of Instantaneous Insolation Values,” Sol. Energy, 40, 413–422.
Jurado,  M., Caridad,  J. M., and Ruiz,  V., 1995, “Statistical Distribution of the Clearness Index with Radiation Data Integrated Over Five Minutes Intervals, Sol. Energy, 55, pp. 469–473.
Olseth,  J. A., and Skartveit,  A., 1984, “A Probability Density Function for Daily Insolation Within the Temperate Storm Belts,” Sol. Energy, 33, 533–540.
Feuillard,  T., Abillon,  J. M., and Marias,  C., 1989, “The Probability Density Function of the Clearness Index: A New Approach,” Sol. Energy, 43, 363–372.
Solar and Meteorological Surface Observation Network, 1961–1990, Version 1.0, September 1993, CD prepared by the U.S. Department of Energy, NREL, Golden, CO.


Grahic Jump Location
Probability density distributions for daily clearness index for June in San Diego and March in Madison
Grahic Jump Location
Probability density distributions for hourly clearness index at noon for June in San Diego and March in Madison
Grahic Jump Location
Parameters C1 and C2 as functions of the monthly average daily clearness index
Grahic Jump Location
Parameters C1 and C2 as functions of the monthly average hourly clearness index
Grahic Jump Location
Daily probability density functions
Grahic Jump Location
Daily cumulative distribution functions
Grahic Jump Location
Hourly probability density functions
Grahic Jump Location
Hourly cumulative distribution functions




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