Optimization of air chamber in solar air collector Orest Pakholiuk, Iryna Zadorozhnikova, Serhii Uzhehov, Oleksandr Chapyuk and Ruslan Pasichnyk E3S Web Conf., 166 (2020) 04004 Published online: 22 April 2020 DOI: 10.1051/e3sconf/202016604004