Air flow and particle control with different ventilation systems in a classroom

Indoor Air
S Holmberg, Q Chen

Abstract

Most ventilation and air conditioning systems are designed without much concern about how settling particles behave in ventilation air flows. For displacement ventilation systems, designers normally assume that all pollutants follow the buoyant air flow into an upper zone, where they are evacuated. This is, however, not always true. Previous studies show that high concentrations of settling respirable particles can be found in the breathing zone, and that the exposure rates can be a health hazard to occupants. The emphasis here is on how ventilation systems should be designed to minimize respirable airborne particles in the breathing zone. The supply and exhaust conditions of the ventilation air flow are shown to play an important role in the control of air quality. Computer simulation programs of computational fluid dynamics (CFD) type are used. Particle concentrations, thermal conditions and modified ventilation system solutions are reported.

References

Jan 1, 1985·Journal of Toxicology and Environmental Health·B E LehnertS H Bomalaski

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Citations

Aug 15, 2008·Journal of Hazardous Materials·Bin Zhao, Jun Wu
Oct 18, 2014·International Journal of Occupational Medicine and Environmental Health·Susana ViegasCarla Viegas
Jun 27, 2019·Environmental Science and Pollution Research International·Morteza AbdolzadehMarcelo Pustelnik

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