A critical look at recent interpretations of the Angstrom approach and its future in global solar radiation prediction
Article Abstract:
Previous studies on the use of A. Angstrom's model for predicting global solar radiation are inconsistent with its use of coefficients and lack sufficient climatologic evidence to be considered valid. Past research also failed to develop the approaches required to generalize and improve the model. Further studies should be conducted to address issues concerning climatological influences on radiation and sunshine, statistical and stochastic models to support Angstom's approach and wide scale effects of sunshine recorders.
Publication Name: Solar Energy
Subject: Petroleum, energy and mining industries
ISSN: 0038-092X
Year: 1995
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Dependence on solar elevation and the daily sunshine fraction of the correlation between monthly-average-hourly diffuse and global radiation
Article Abstract:
The correlation between monthly-average-hourly diffuse and global radiation was investigated for dependence on solar elevation and the daily sunshine fraction. The results using data obtained from Uccle, Belgium, showed that the dependence of the correlation on the daily sunshine fraction was characterized by maximum values of diffuse radiation during partially cloudy skies. The dependence on solar elevation, on the other hand, was characterized by an inversely proportional relation between diffuse and global radiation.
Publication Name: Solar Energy
Subject: Petroleum, energy and mining industries
ISSN: 0038-092X
Year: 1992
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Estimation of the error caused by the circumsolar radiation when measuring global radiation as a sum of direct and diffuse radiation
Article Abstract:
Global radiation measurements as a sum of diffuse radiation and as a vertical component of direct radiation were used to eliminate the directional pyranometer errors in order to obtain accurate radiation data. The method approximates the penumbra function of diffusometers.The circumsolar difference values were calculated for a cavity type absolute pyrheliometer and a normal incidence pyrheliometer.
Publication Name: Solar Energy
Subject: Petroleum, energy and mining industries
ISSN: 0038-092X
Year: 1992
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