Gray box time variant clogging behaviour and pressure drop prediction of the air filter in the HVAC systemAlimohammadi, Hossein; Vassiljeva, Kristina; Petlenkov, Eduard; Thalfeldt, Martin; Mikola, Alo; Kull, Tuule Mall; Köse, AhmetE3S Web Conference: Cold Climate HVAC and Energy 20212021 / art. 10002 https://doi.org/10.1051/e3sconf/202124610002 Conference Proceedings at Scopus Article at Scopus Article at WOS