Fine dust control by HVAC in Seoul metro subway

Seoul metro takes care of the air quality of indoor space of the subway through the HVAC (high ventilation and air conditioning) system. It contains a few dust control devices including panel type filter, electrostatic precipitator and demister. This work reviews current air control systems installed in sample stations focusing on dust particle collection. As a result of the survey, panel type filters showed moderated efficiency of dust collection with low DeltaP. Collection efficiency varies from about 20% to 90% depending on the filter life and particle size.