International Science Community Association International Research Journal of Environmental Sciences 15 4 2026 10 22 Mathematical Modeling, Energy and Exergy Analysis of a Solar Air Collector under Variable Operating and Climatic Conditions 75 84 EN Sirojiddin Muradov 1 Karshi state technical university, Karshi, Uzbekistan Dubey Arti 1 Department of Chemistry, VIVA College Virar (W), Maharashtra, India KANSOLE and Laboratory of Geosciences and Environment (LaGE) Michelline Marie Regina 1 University Yembila Abdoulaye Toguyeni, P.O 54 Fada N' Gourma, Burkina Faso University Joseph KI-ZERBO 2 Multidisciplinary Laboratory for Engineering Science Research, Polytechnic School of Ouagadougou (EPO), 18 PO 234 Ouaga 18, Burkina Faso P.O 7021 3 University Yembila Abdoulaye Toguyeni, P.O 54 Fada N' Gourma, Burkina Faso Ouagadougou 4 Burkina Faso 5 BEIDARI Mohamed 6 KIMA Adama 7 Kumar Brinder 1 Department of Zoology, GGM Science College Jammu, J&K (UT), India Yadav Surender Singh 1 Department of Economics, Government College, Kanina (Mahendergarh), Haryana, India Narayan Laxmi 2 Department of Economics, Government College, Mahendergarh, Haryana, India Musajonov Mukhammadrasul 1 Tashkent State Transport University, Temiryo‘lchilar Street 1, Tashkent, 100167, Uzbekistan Ibadullaev Ahmadjon 2 Tashkent State Transport University, Temiryo‘lchilar Street 1, Tashkent, 100167, Uzbekistan Babayev Askar 3 Tashkent State Transport University, Temiryo‘lchilar Street 1, Tashkent, 100167, Uzbekistan Chorshanbiev Umar 4 Tashkent State Transport University, Temiryo‘lchilar Street 1, Tashkent, 100167, Uzbekistan Souley HAROUNA 1 Department of Civil Engineering, School of Mines, Industry and Geology of Niamey (EMIG), Niamey, Niger Abdourazakou MAMAN HASSAN 2 Department of Mines-Geology, School of Mines, Industry and Geology of Niamey (EMIG), Niamey, Niger IBRAHIM ELHADJI DAOU 3 Department of Mining Engineering and Environment, School of Mines, Industry and Geology of Niamey (EMIG), Niamey, Niger Chékaraou Mahamane Moustapha Sanda 4 Djibo Hamani University of Tahoua, Faculty of Education Sciences, Department of Discipline Didactics, Tahoua-Niger Mansour Badamassi Kadri Mahaman 5 Dept. of Geological and Environmental Sciences, Faculty of Sciences and Techniques, André Salifou University of Zinder (UAS), Zinder, Niger Laouali Idi Karimou 6 Department of SVT, Abdou Moumouni University, Higher Normal School, Niamey, Niger Adama BOUBACAR AMADOU 7 Department of Mines-Geology, School of Mines, Industry and Geology of Niamey (EMIG), Niamey, Niger Usmanovich Samadov Alisher 1 Department of Engineering Communication, Tashkent University of Architecture and Civil Engineering, Tashkent, Uzbekistan qizi Abdusamiyeva Lobarkhon Nomonjon 2 Department of Mining, Almalyk State Technical Institute, Almalyk, Uzbekistan Bakhodirovna Khojimuratova Khilola 3 Department of Mining, Almalyk State Technical Institute, Almalyk, Uzbekistan Khikmatullayevich Ibragimov Umidjon 1 Karshi state technical university, Karshi, Uzbekistan Rubenovich Avanesov Tigran 2 Karshi state technical university, Karshi, Uzbekistan Ubaydullayevna Mirzayorova Sevara 3 Karshi state technical university, Karshi, Uzbekistan > Research Paper 2026 8 28 2026 10 22 This research presents a mathematical model for assessing the energy and exergy performance of a turbulator-equipped solar air heater (SAH) subjected to changing climatic and operating conditions. The model incorporates variations in solar irradiance, ambient temperature, and air mass flow rate, together with thermal losses, heat exchange between the absorber and air, and airflow resistance. Simulations were conducted for Qarshi from 08:00 to 18:00 using meteorological data for 15 June, 15 July, 15 August, and 15 September 2024. The corresponding peak solar irradiance values were 988.9, 945.3, 961.7, and 793.3 W/m2. On 15 July, the absorber and outlet air temperatures reached 79.5℃ and 72.2℃, respectively; by 15 September, they had fallen to 70.9℃ and 63.7℃. The exergy calculations indicated that increasing the air mass flow rate from 0.002 to 0.023 kg/s reduced external exergy losses from 183 W to 17 W. Over the same flow-rate range, exergy destruction due to absorber-to-air heat transfer declined from a maximum of 11.5 W to 1 W, whereas friction-related exergy destruction rose from 1 W to 4.9 W. These results highlight the importance of evaluating both energy performance and exergy-related losses and irreversibility when assessing SAH operation. Copyright@ International Science Community Association