Results 231 to 240 of about 11,778 (264)

Radiation Entropies in Diffuse Reflection and Scattering and Application to Solar Radiation

Journal of the Physical Society of Japan, 1982
The specific intensity of energy radiation reflected diffusely by a large sphere (or scattered by a small particle) is examined. The entropy change in diffuse reflection of radiation by the sphere (or in scattering) is given and shown to be positive.
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DIFFUSE AND GLOBAL SOLAR RADIATION CORRELATIONS FOR JORDAN

International Journal of Solar Energy, 1991
Widely used correlations, for estimating both the monthly average global and diffuse radiations incident on a horizontal surface, have been statistically compared to recommend ones that best fit the measured radiation data in Jordan The recommended correlations were further modified, by estimating the various coefficients of these correlations based on
M. A. HAMDAN, A. I. AL-SAYEH
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Regression models for hourly diffuse solar radiation

Solar Energy, 2016
Abstract Accurate information about the available solar radiation is a key factor in designing efficient photovoltaic systems. In general, the meteorological stations measure global solar irradiance on the horizontal surface. In order to estimate the total solar irradiation on surfaces with different spatial orientations, the knowledge of all ...
Eugenia Paulescu, Robert Blaga
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A comparison of methods for estimating hourly diffuse solar radiation from global solar radiation

Solar Energy, 1982
Abstract Four methods of estimating hourly diffuse irradiation from hourly global irradiation are compared, using global and diffuse irradiation data from the Australian Bureau of Meteorology for five widely separated Australian locations. A development of one of these methods with constants derived from the data for each place is found to perform ...
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Estimation of hourly beam and diffuse solar radiation

Solar & Wind Technology, 1986
Abstract Measurements of beam and diffuse solar irradiance on a horizontal surface have been utilized to verify simple methods of prediction of solar radiation. Measurements of hourly beam and diffuse solar irradiance on a horizontal surface have been made at Roma, a town 35 km from Maseru, on a few selected clear cloudless days during 1984–1985 and ...
K.K. Gopinathan, P. Polokoana
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Correlation of diffuse solar radiation with air mass

Solar & Wind Technology, 1988
Abstract Measurements of total and diffuse components of solar radiation have been conducted using pyranometers at Zaria (latitude 11°06′N, longitude 07°41′E and altitude of 653.9 m) and Kano (latitude 12°03′N, longitude 8°32′E and altitude of 472.1 m) in northern Nigeria during the period when the dust-bearing north-easterly harmattan winds blow ...
M.D.C. Doyle, A.S. Sambo
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A model for calculating direct and diffuse solar radiation

Solar Energy, 1981
A new model is presented for computing both direct and diffuse solar radiation for a cloudy sky, based on the model of King and Buckius for the direct component for a clear sky. The model is employed to calculate the daily global insolation incident on a horizontal surface at Ibadan for the year 1977.
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Global, direct and diffuse solar-radiation in Syria

Applied Energy, 2004
Solar-radiation components, namely global, diffuse and direct, were calculated over the Syrian landmass using several mathematical equations starting from the Angstrom formula. An appropriate theoretical method and a computer program were specially designed and developed for these calculations. The program provides fast, direct and accurate information
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Daily diffuse solar radiation in Guangzhou, China

2010 International Conference on Optics, Photonics and Energy Engineering (OPEE), 2010
Six models for estimation of K d vs. K t or K d vs. S / S 0 using data from Guangzhou, China, were demonstrated in this study. The data set covers a period of 10 years (1995–2004). Estimated values were compared with measured values in terms of statistical error tests such as mean percentage error (MPE), mean bias error (MBE) and root mean square ...
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Estimating Diffuse Solar Radiation from Global Solar Radiation

Proceedings of the EuroSun 2014 Conference, 2015
Nald Erusiafe, Michael Chendo, Nsikak Obot   +2 more
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