The use of heat transformers for the low-temperature secondary energy resources recovery in non-ferrous metallurgy enterprisesA. Sh. Alimgazin, S. A. Prishchepova, I. A. Sultanguzin, A. V. Fedyukhin, Yu. V. Yavorovsky and A. I. BartenevE3S Web Conf., 178 (2020) 01017DOI: https://doi.org/10.1051/e3sconf/202017801017