Plume dispersion on the roof of a building: Influence of rooftop structure geometry

Abstract eng:
A wind tunnel study was carried out to study the influence of rooftop structure (RTS) width and orientation on plume dispersion for a stack located in the wake of the rooftop structure. The study focused on low-rise buildings because RTS have maximum effect on low-rise buildings. SF6 was used as a tracer gas to simulate the exhaust coming out of the stack whose height varied from 1 to 5 m. The downwash effect of RTS was examined for widths (w) varying from 0.2 to 0.6 times the width (W) of the windward face of the emitting building. The height (h) of RTS varied from 0.2 to 0.4 times the height (H) of the emitting building. To examine the effect of orientation wind tunnel experiments were carried out for wind directions varying from 0 to 60 degrees. For normal winds (wind direction = 0 degree), the plume centerline concentrations were found to be maximum for the widest RTS. Maximum downwash and concentrations were observed for a wind direction of 45 degrees. The current ASHRAE [1] plume dispersion models were also evaluated.

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