실내외 압력 차에 따른 단창과 이중창의 틈새로 침투된 간접흡연의 입자 크기 분포 특성

Characterization of Particle Size Distribution of Infiltrated Secondhand Smoke through the Gap in a Single Glazed and a Secondary Glazed Window by Indoor and Outdoor Pressure Differences

Objectives: Outdoor tobacco smoke can penetrate into the indoor environment through cracks in the building envelope. This study aimed to characterize the particle size distribution of infiltrated secondhand smoke (SHS) through the gap in a single glazed and a secondary glazed window according to pressure differences in a chamber. Methods: Two polyvinyl chloride sliding windows were evaluated for infiltration, one with a glazed window and the other with a secondary glazed window. Each window was mounted and sealed in a polycarbonate chamber. The air in the chamber was discharged to the outside to establish pressure differences in the chamber (ΔP). Outdoor smoking sources were simulated at a one-meter distance from the window side of the chamber. The particle size distribution of the infiltrated SHS was measured in the chamber using a portable aerosol spectrometer. The particle size distribution of SHS inside the chamber was normalized by the outdoor peak for fine particles. Results: The particle size distribution of SHS inside the chamber was similar regardless of window type and ΔP. It peaked at 0.2-0.3 µm. Increases in particulate matter (PM) concentrations from SHS infiltration were higher with the glazed window than with the secondary glazed window. PM concentrations of less than 1 µm increased as ΔP was increased inside the chamber. Conclusions: The majority of infiltrated SHS particles through window gap was 0.2-0.3 µm in size. Outdoor SHS particles infiltrated more with a glazed window than with a secondary glazed window. Particle sizes of less than 1 µm were associated with ΔP. These findings can be a reference for further research on the measurement of infiltrated SHS in buildings.