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Observation and Simulation of Available Solar Energy at N’Djamena, Chad

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Document pages: 14 pages

Abstract: The objective of thiswork is to evaluate the available solar potential at N’Djamena (12°08N,15°04E) from 2017 to 2018. To achieve this goal, we usedvarious datasets and model including: the in situ shortwave radiation (bypyranometer) measurement and sunshine duration (by Campbell-Stokes heliograph) obtained from N’Djamena station, observations fromMODIS (aerosol optical depth (AOD) and precipitablewater) satellite sensors, and simulations from Streamer radiative code. The results show the presence of a goodavailable solar potential with an annual global potential of 4.71 kWh m2 d. At the intra-seasonal time scale, there are two maximums for the globalsolar potential. The first maximum is registered in the month of March (spring)with value of 5.7 kWh m2 d and the second in October(autumn) with value of 5.18 kWh m2 d. However, the minimum of global potential is recorded in winter (from December to February) withvalues around 3.86 kWh m2 d. Then, the measured global irradiation allowed validatingthe Streamer radiative transfer code with a score of more than 98 .Subsequently, this model was used to simulate direct normal and diffuseirradiation for several types of days (clear, dusty and cloudy days). Anexamination of the dust influence on solar radiation based on selected cases(AOD = 2.05) indicates a mean decrease of 3.33 and 3.17 kWh m2 d, respectively, for the totaland direct normal potential. This corresponds to an increase of the diffuse potential of 0.52 kWh m2 d. Finally, an increase of 5.82cm of precipitable water per day tends to decrease the overall potential of0.73 kWh m2 d and the direct normal potentialof 1.74 kWh m2 d. For this cloudy day, thepotential has increased more than 0.89 kWh m2 d.

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