New principles of heat recovery of ventilation emissions from multi-apartment buildings (AB)Gregory Vasilyev, Nikolay Timofeev, Marina Kolesova, Igor Yurchenko, Svetlana Marchenkova and Alexander DmitrievE3S Web Conf., 258 (2021) 11009DOI: https://doi.org/10.1051/e3sconf/202125811009