Abstract
In order to limit the infiltration of outdoor air pollutants, a positive indoor air pressure should be maintained. This study aims to investigate the minimum mechanical ventilation rate to achieve a positive indoor air pressure for large space buildings with different kinds of envelopes. The types of building envelope include envelope with multilayer windows (which generally appears in shopping malls and open-plan office buildings), envelope with entrances on the first floor and multilayer windows, and envelope with openings at bottom and top levels (which generally appears in industrial plants). It is concluded that the minimum ratio between mechanical ventilation and initial infiltration rates to achieve a positive indoor air pressure depends on the window width-height ratio, the vertical spacing between windows, and the number of window layers. More regulations are summarized and analysed to guide the ventilation design.
Highlights
The exposure to indoor air pollutants can negatively affect the health of occupants [1]
The types of building envelope include envelope with multilayer windows, envelope with entrances on the first floor and multilayer windows, and envelope with openings at bottom and top levels
It is necessary to figure out the minimum mechanical ventilation rate to achieve a positive indoor air pressure
Summary
The exposure to indoor air pollutants can negatively affect the health of occupants [1]. One of the main sources of indoor air pollutants is infiltration. This problem is especially serious when outdoor air pollution is severe. Stack effect and wind pressure are two main factors leading to air infiltration in buildings [2]. With the rapid construction of high-rise buildings, wind speed in cities has decreased significantly, resulting in horizontal static wind [3]. Horizontal static wind is not conducive to the diffusion and dilution of air pollutants, and is one of the important causes of air pollution [4]. Under the effect of horizontal static wind, the stack effect is the main factor leading to air infiltration in buildings in cities
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