Estimation of usage efficiency of freon-steam turbines in mine energy complexes Mykhailo Kirsanov, Inna Diakun, Vitalii Ruban, Viktor Skosyriev and Oleksandr Zhevzhyk E3S Web Conf., 168 (2020) 00048 Published online: 06 May 2020 DOI: 10.1051/e3sconf/202016800048