Size-dependent particulate matter indoor/outdoor relationships for a wind-induced naturally ventilated airspace
Resource
Building and Environment 39 (4): 411-420
Journal
Building and Environment
Journal Volume
39
Journal Issue
4
Pages
411-420
Date Issued
2004
Date
2004
Author(s)
Abstract
We applied a simple size-dependent indoor air quality model associated with measured outdoors particulate matter (PM) profiles and potential loss mechanisms to characterize PM indoor/outdoor (I/O) relationships for wind-induced naturally ventilated residences in Taiwan region. The natural ventilation rate was quantified by the opening effectiveness for sidewall opening and covered ridge with sidewall-opening-type homes. The measured results demonstrate that integrated PM10 and PM2.5 mass concentrations for the urban area are 39.2 and 3.13 μg m-3, respectively, whereas for the suburban area are 75.76 and 69.87 μg m-3, respectively. The most significant removal mechanisms included natural ventilation through and particle deposition on indoor surfaces. The predicted average PM mass I/O ratios were 0.56 and 0.42 for PM2.5 and PM10, respectively. We also employed published data on mass-weighted size distributions for specific chemical constitutes of PM, sulfate and nitrate, to predict PM I/O ratios in the central Taiwan region; the resulting values ranged from 0.22 to 0.43 and 0.27 to 0.36 for sulfate and nitrate, respectively. Our results demonstrate that the PM I/O ratios for a wind-induced natural ventilated airspace depend strongly on the ambient particle distributions, building openings design (e.g. height-to-length ratio of openings and roof slope), wind speed, wind angle of incidence, and outdoor PM metrics. © 2003 Elsevier Ltd. All rights reserved.
Subjects
Deposition; Indoor/outdoor ratio; Modeling; Natural ventilation; Opening effectiveness; Particulate matter
SDGs
Other Subjects
Air quality; Concentration (process); Particles (particulate matter); Size determination; Wind effects; Wind angle; Wind speed; Ventilation; building; indoor air; particulate matter; Ventilation; wind direction
Type
journal article
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