RETRACTED: Determination of the useful working coefficient (UWC) of the heating systemZokhidjon Abdulkhaev, Shairakhon Abdujalilova, Mavlonbek Usmonov, Khasanboy Askarov and Raxnamoxon NazirovaBIO Web Conf., 84 (2024) 05040DOI: https://doi.org/10.1051/bioconf/20248405040