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Analysis of solar radiation measurements at Sana'A University weather station (15°N, 44°E)

1988; Elsevier BV; Volume: 5; Issue: 5 Linguagem: Inglês

10.1016/0741-983x(88)90037-9

1878-2752

A. I. SALEM, M.K. Al-Motawakel, A. H. Bassyouni,

Photovoltaic System Optimization Techniques

The daily totals of global solar radiation on a horizontal surface at Sana'a (15°N, 44°E) during the period 1980 to 1984 have been processed, analysed and presented. Mean annual, monthly and daily totals, the diurnal variation, frequency distribution of daily totals, frequency of extended periods with daily totals of global solar radiation less than 8.5, 12.75, 17, 21, 25.5 and 29.8 MJ/m2/day for 2, 3 and 4 successive days are computed and discussed. The results presented in this analysis are encouraging, for they indicate that periodsof several days of low radiation are rare (i.e. below 8.4 MJ/m2/day). This in turn means that the weather sequence variations are not expected, at least in the plateau region of the country [A1-Motawakel et al., Appl. Energy15, 139 (1983)], to be of great importance to the problems of storage and/or “back-up” facing engineers considering the use of solar energy for practical applications.