A multipyranometer instrument for obtaining the solar beam and diffuse components, and the irradiance on inclined planes
Article Abstract:
Validation measurements obtained with a stationary multipyranometer system were used to obtain both beam and diffuse components of solar radiation and theglobal insolation on arbitrary inclined planes. The results showed that the average annual rms error for the beam component was 50 W per square meter when minute data was used or 47 W per square meter when hourly data was used. Horizontal global radiation error was measured at 18 W per square meter. The rms error for insolation on arbitrary inclined planes were smaller than 30 W per square meter.
Publication Name: Solar Energy
Subject: Petroleum, energy and mining industries
ISSN: 0038-092X
Year: 1992
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A comparison between one year of daily global irradiation from ground-based measurements versus Meteosat images from seven locations in Tunisia
Article Abstract:
Daily images produced on the visible channel of the METEOSAT B2 (meteorological satellite) were compared with measurements of solar radiation observed by seven meteorological stations in Tunisia. GISTEL methodology was applied to the pictures for estimating the incidence of global irradiation over Tunisia, considering such parameters as sky turbidity, background atmospheric brightness and mean bad weather attenuation. A percent relative error of 51% was reached from 1171 of 2285 measured-estimated daily pairs.
Publication Name: Solar Energy
Subject: Petroleum, energy and mining industries
ISSN: 0038-092X
Year: 1992
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Calculation of direct solar radiation on tilted surfaces
Article Abstract:
Formulae to transform on an arbitrary oriented tilted surface the direct solar radiation data measured on a tilted plane is presented. The derivations considered the nonzero angular dimensions of the sun and were generalised for concentrated solar radiation. It may also be used to approximate unconcentrated rays unless the angles of the measured and converted irradiances with respect to the normal of the surface vary substantially.
Publication Name: Solar Energy
Subject: Petroleum, energy and mining industries
ISSN: 0038-092X
Year: 1992
User Contributions:
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