Prediction Method of Steady Concentration of Passive Contaminant in Ventilation System with Air Recirculation: Contaminant released in the air duct

When the hazardous substances are released in air duct of ventilation system, they transported into room through supply inlets, causing harm to indoor personnel. In system with recirculation, contaminant entering is recirculated return outlet, and then affects concentration air, making it difficult be determined. this work, a method proposed predict steady passive when duct. The based on fixed flow field room. lumped parameter utilized establish relationship between concentrations inlet outlet for each handling unit. linear superposition accessibility index adopted at an arbitrary position compared prediction It can rapidly distributions all rooms supplied by recirculation.