Abstract
The method by Pinazo et al. (Pinazo JM, Cañada J, Boscá JV. A new method to determine Ångström’s turbidity coefficient: its application for Valencia. Solar Energy 1995;54(4):219–226) to determine the Ångström turbidity coefficient is modified. Two new correlations are developed that link Pinazo’s method with model ‘C’ by Iqbal (Iqbal M. An introduction to solar radiation. New York: Academic Press, 1983), and are derived using measured horizontal visibility data. The modified model is used to compute Ångström turbidity coefficient for Brunei Darussalam using measured data on solar radiation for a period of 5 years (1990–1994). The data were collected from the Meteorological Department of Civil Aviation, Ministry of Communication, Brunei Darussalam. A comparison of the modified model is made with those by Pinazo and Iqbal. The preliminary calculations reveal that the modified model is capable of computing Ångström turbidity coefficient more accurately than that developed by Pinazo and it can be used to compute Ångström turbidity coefficient for any location irrespective of the climatological zones.
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