Comparing strategies for improving thermal performance of an existing district heating (DH) network: low temperature DH in Omsk, RussiaStanislav Chicherin, Lyazzat Junussova, Timur Junussov and Chingiz JunussovE3S Web Conf., 173 (2020) 03001DOI: https://doi.org/10.1051/e3sconf/202017303001