Investigation of solar air collectors with concave air duct Bekzod Abdukarimov, Mamadali Madraximov, Barhayot Maxsitaliyev, Muslimbek Solijonov and Mirzoxid Mirzrahimov E3S Web of Conf., 508 (2024) 02003 Published online: 05 April 2024 DOI: 10.1051/e3sconf/202450802003