Also discussed here: Air Pollution, Gone With the Wind: Proposed New Building Guidelines to Clean Up the Air We Breath(Science Daily, Nov. 1, 2012)
And here: Tracer Gas dispersion in an Urban Environment:Scaling Considerations in wind tunnel testing(13 page pdf, Amit Gupta, Ted Stathopoulos, Journal of Wind and Engineering, Jan. 2012)
And here: Air pollution, gone with the wind -Concordia researchers propose new building guidelines to clean up city air(University Communications Services, Concordia University, Nov. 2, 2012)
And here: Why skyscrapers are polluting our cities(FirstPost, Nov. 2, 2012)
Today we review award winning research in Montreal that uses wind tunnels to examine the circulation of pollution from one building to another. Suggested solutions include better spacing between buildings and better location of air vents.
Key Quotes:
“This paper investigates the downwash effect of a rooftop structure (RTS) representing a typical RTS on plume dispersion. The effect of wind direction, exhaust speed, stack location, stack height, and RTS crosswind width on the severity of the downwash effect on the plume is assessed”
“We created model configurations consisting of buildings of various sizes and shapes…We then placed our models downwind of a building that was emitting toxins to trace the path from polluter to polluted. That allowed us to see how much pollution was being absorbed by buildings downwind and where on those buildings that pollution was most concentrated.”
“the turbulent properties of the approaching flow are important for proper modelling of plume dispersion in the near wake of a building”
"three main guidelines for the placement of stack and intake in order to minimize the amount of air pollution that makes its way into downwind buildings:
*intake vents on buildings downwind of a polluter need to be placed upwind of that building's stack, and closer to its more sheltered wall.
*air intakes should not be placed on rooftop locations downwind of a low stack and the protected wall of the emitting building.
*increased spacing between buildings can reduce the possibility that pollutants from one will be re-ingested by another."
"While our research may not reduce the amount of outdoor pollution in our cities,..it can certainly help ensure that this same dirty air is not re-circulated indoors."
“awarded the prestigious Davenport Medal by the International Association for Wind Engineering in September 2012”
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