Evaluation of global solar radiation from meteorological data in the Sahelian zone of Chad

Abstract

The study focuses on the evaluation of global solar radiation on a horizontal level. The estimate of the solar layer was made on the basis of mathematical model obtained from the relations of Angstrom-Prescott, Allen and Sabbagh. The different proposed models have been implemented by using MATLAB and Excel. The models were evaluated using MPE, NSE, RMSE and MBE. The outcome of this shows that the Angstrom-Prescott model is the most suitable for the calculation of global solar radiation in the sites of Mongo with values of 5.887 kWh/m 2. For the site of Bokoro, the Allen model is the most adapted for the calculation of global solar radiation which is 5.872 kWh/m 2. On the other hand, the Sabbagh model is appropriate for the sites of Abeche, N'Djamena, Ati and Moussoro with respective values of 6.354, 5.742, 5.523 and 6.126 kWh/m 2. The obtained results show that the Sahelian zone of Chad has a good solar potential and consequently suitable for the exploitation of solar energy systems.

Wind and Solar Assessment in the Sahelian Zone of Chad

“…In general, the value of the global solar radiation of the Sahelian zone is of the order of 6 kWh/m 2 /day. These results are similar to those obtained in the evaluation of global solar radiation made by Soulouknga et al [9] and those of the NASA database as shown in Figs. 16, 17, 18 and 19.…”

“…In general, on a horizontal plan, the relation of Klein [24] defines the solar radiation (H0) outside the atmosphere as: (9) where:…”

“…pumping water. In terms of solar energy, Soulouknga et al [9] revealed that the Sahel zone has an encouraging potential for solar energy harvesting. However, previously published studies are either limited to one region in the case of solar assessment or failed to explore extensively with regard to a higher altitude in the case of wind energy assessment.…”

Estimation of Global Solar Radiation on Horizontal Surface from Sun Shine Hours and Temperature at Kombolcha, Amhara Region, Ethiopia

“…The minimum average solar radiation for the most part of the country is said to be about 5.3 KWh/m 2 /day [6]. In the past, a large number of researchers have used Sun shine based empirical equation and Angstrom-type correlation model to estimate the global solar radiation on a horizontal surface [7][8][9][10][11][12][13]. There is no finding that have been done before at a kombolcha sites to estimate the global solar radiation using the sun-shine and temperature based empirical equations.…”

Determination of a Suitable Solar Radiation Model for the Sites of Chad

“…The weather parameters are the ambient temperature, the relative humidity, the sunshine duration. Amongst the astronomical parameters one has the maximum duration of the day, the variation of the sun, the variation of the ground-sun distance and the solar radiation in the extraterrestrial radiation [20]. As part of this work, these include the Angstrom-Prescott model, the Allen model and the Sabbagh model.…”