Portable photocatalytic air cleaners: efficiencies and by-product generation

摘要: Portable photocatalytic air cleaners were investigated in 24 and 48 m3 emission test chambers with regard to efficiency by-product generation. For this purpose, formaldehyde, decane, 1,2-dichlorobenzene, toluene, α-pinene heptanal doped at sub-ppm concentration levels into the individually mixtures. By way of specified protocols, efficiencies could be distinguished but strongly dependant on choice compounds, especially whether single or multi compound dosing was used, long-term effects. Initial clean delivery rates (CADRs) up 137 m3/h measured. Typical by-products found significant concentrations. The main ones formaldehyde 50 ppb (62 μg/m3) acetone 80 ppb (190 μg/m3). Other aldehydes also found, smaller levels. detection chloroacetone, a strong irritating compound, concentrations 15 ppb (57 μg/m3) strengthens importance such investigations cases chloro-organic compounds are involved.