Abstract
The total solar energy radiation and sunshine duration data collected by the Indonesian Institute of Meteorology and Geophysics (IMG) during 14 years are discussed (1965–1979). For further analysis, it is supported by the measurement of the total radiation and the diffuse radiation on the horizontal surface and also the total radiation on the tilted surface in the Physics Department of the University of Indonesia. By using the data, we calculated and constructed the diffuse solar radiation, clearness index histogram, space insolation distributions, daily, monthly and yearly diagrams on the basis of reports by M.C. Pereira [1]. Other aspects of using flat plate collector concentrators, and also the methods of global solar radiation estimation in Indonesia by using the 14 years data available are discussed in this paper.
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