1. Nikita Khliyev, Olga Khliyeva, Arteom Nikulin, Vitaly Zhelezny The modeling of the total efficiency of hybrid photovoltaic/thermal collector with direct absorption of thermal energy// BOOK OF ABSTRACTS15TH INTERNATIONAL VIRTUAL CONFERENCE ON ENERGY STORAGE. Ljubljana, Slovenia . June 9 – 11, 2021 – P.122