Seasonal variability of the solar energy potential of the city of Abidjan : Experimental comparative study of two sunshine measurement techniques

摘要

Most countries have a national weather station. In Cote d'Ivoire, it is the Aeronautical and Meteorological Exploitation Company (SODEXAM) which is in charge of it through its databank. The inaccessibility of these data leads many solar energy entrepreneurs to move towards free sites that are often out of phase with the meteorological realities of the area considered. We propose in this paper, a comparative study of two sunshine measurement techniques, namely, the technique of the heliograph (national station) and that of the thermoelectric pyranometer (our laboratory), to discuss the reliability of the data provided by this structure. In addition, we analyzed the seasonal variations of the insolation of Abidjan from 1978 to 2017. The comparison of the results produced by these two approaches showed a discrepancy of up to 43%, with much higher values for the national station. The analysis of the solar field of this city over a period of 19 years has shown a great variability of the solar energy potential which starts from a decrease in energy, from 4447 Wh/m~2 (1978-1988) to 3303 Wh/m~2. (2003-2009), to achieve an energy increase up to 4782 Wh/m~2 (2016-2017). The characterization of the solar year allowed us to divide the months into three solar seasons depending on the irradiation : the big season regrouping the months whose average daily irradiation (Ir_m) is greater than 5 Kwh/m~2, the average season (4 Kwh/m~2