Experimental study of buoyancy driven natural ventilation through horizontal openings

Per Heiselberg, Zhigang Li

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

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Abstract

An experimental study of buoyancy driven natural ventilation through single-sided horizontal openings was performed in a full-scale laboratory test rig. Measurements were made for opening ratios L/D range from 0.027 to 4.455, where L and D are the length and the diameter of the opening, respectively. The bidirectional air flow rate was measured using constant injection tracer gas technique. Smoke visualizations showed that the air flow patterns are highly transient, unstable and complex, and that air flow rates oscillate with time. Correlations between the Froude number Fr and the L/D ratio were in reasonable agreement with result in literature obtained from brine-water measurements, but the obtained Fr values show considerable deviations for a range of L/D ratios. The measurement results can be used in both simple calculation tools to give a rough estimate of the capacity for design of a ventilation system, but also be implemented in more detailed models, especially multi-zone models, for simulation of the performance of natural ventilation systems

Original languageEnglish
Title of host publicationProceedings of Roomvent 2007 : Helsinki 13-15 June 2007
EditorsOlli Seppänen, Jorma Säteri
Number of pages10
PublisherFINVAC ry
Publication date2007
ISBN (Print)9789529989812
Publication statusPublished - 2007
EventThe International Conference on Air Distribution in Rooms, Roomvent - Helsinki, Finland
Duration: 13 Jun 200715 Jun 2007
Conference number: 10

Conference

ConferenceThe International Conference on Air Distribution in Rooms, Roomvent
Number10
CountryFinland
CityHelsinki
Period13/06/200715/06/2007

Keywords

  • Roomvent
  • The International Conference on Air Distribution in Rooms
  • Natural ventilation
  • Buoyancy

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