The waste energy recovery, an energy-efficient solution for the industrial sector Adriana Tokar, Dan Negoiţescu, Marius Adam, Dănuț Tokar and Arina Negoiţescu E3S Web Conf., 111 (2019) 06063 Published online: 13 August 2019 DOI: 10.1051/e3sconf/201911106063