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

S. Holmberg, Q. Chen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

90 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)200-204
Number of pages5
JournalIndoor Air
Issue number2
Publication statusPublished - Jun 2003


  • Classroom
  • Computational fluid dynamics
  • Displacement ventilation
  • Mixing ventilation
  • Particles
  • System solutions

ASJC Scopus subject areas

  • Environmental Engineering
  • Building and Construction
  • Public Health, Environmental and Occupational Health


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