TY JOUR TI JUSTIFICATION OF HYBRID VENTILATION SYSTEMS OPERATING BOUNDARIES KW hybrid ventilation KW mixed-mode ventilation KW natural ventilation KW air exchange factor KW thermal buoyancy KW wind driven ventilation JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Abramkina, D.V. PY 2022 IS 7 PB Belgorod State Technological University named after V.G. Shukhov