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The aim of this work is to study the influence of the chimney-collector junction geometry on the performance of the solar chimney CCS. Three geometries are chosen for this study: perpendicular, curved and inclined. A mathematical modeling of the CCS has been developed. The results of the numerical simulation obtained were presented, interpreted and compared. Reading the results obtained for the three geometries in question show that the junction in half-circle form is the most favorable., {"references":["Philippe Arqués., 2007. Théorie générale des machines : machine à réaction, motrices et réceptrices, à vapeur ou à gaz. Edition Technip, Paris.","Amel Dhahri, Ahmed Omri, 2013. A Review of solar chimney power generation technology, International Journal of Engineering and Advanced Technology (IJEAT), vol. 2, n° 3, pp. 1-17.","Dos, M.A., Bernardes, S., Vob, A., Meinrebe, G., 2003. 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