Experimental study of buoyancy driven natural ventilation through horizontal openings

Per Heiselberg, Zhigang Li

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Resumé

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

OriginalsprogEngelsk
TitelProceedings of Roomvent 2007 : Helsinki 13-15 June 2007
RedaktørerOlli Seppänen, Jorma Säteri
Antal sider10
ForlagFINVAC ry
Publikationsdato2007
ISBN (Trykt)9789529989812
StatusUdgivet - 2007
BegivenhedThe International Conference on Air Distribution in Rooms, Roomvent - Helsinki, Finland
Varighed: 13 jun. 200715 jun. 2007
Konferencens nummer: 10

Konference

KonferenceThe International Conference on Air Distribution in Rooms, Roomvent
Nummer10
LandFinland
ByHelsinki
Periode13/06/200715/06/2007

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Buoyancy
Ventilation
Air
Flow rate
Froude number
Smoke
Flow patterns
Visualization
Gases
Water

Citer dette

Heiselberg, P., & Li, Z. (2007). Experimental study of buoyancy driven natural ventilation through horizontal openings. I O. Seppänen, & J. Säteri (red.), Proceedings of Roomvent 2007: Helsinki 13-15 June 2007 FINVAC ry.
Heiselberg, Per ; Li, Zhigang. / Experimental study of buoyancy driven natural ventilation through horizontal openings. Proceedings of Roomvent 2007: Helsinki 13-15 June 2007. red. / Olli Seppänen ; Jorma Säteri. FINVAC ry, 2007.
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title = "Experimental study of buoyancy driven natural ventilation through horizontal openings",
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",
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Heiselberg, P & Li, Z 2007, Experimental study of buoyancy driven natural ventilation through horizontal openings. i O Seppänen & J Säteri (red), Proceedings of Roomvent 2007: Helsinki 13-15 June 2007. FINVAC ry, The International Conference on Air Distribution in Rooms, Roomvent, Helsinki, Finland, 13/06/2007.

Experimental study of buoyancy driven natural ventilation through horizontal openings. / Heiselberg, Per; Li, Zhigang.

Proceedings of Roomvent 2007: Helsinki 13-15 June 2007. red. / Olli Seppänen; Jorma Säteri. FINVAC ry, 2007.

Publikation: Bidrag til bog/antologi/rapport/konference proceedingKonferenceartikel i proceedingForskningpeer review

TY - GEN

T1 - Experimental study of buoyancy driven natural ventilation through horizontal openings

AU - Heiselberg, Per

AU - Li, Zhigang

PY - 2007

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N2 - 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

AB - 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

KW - Roomvent

KW - The International Conference on Air Distribution in Rooms

KW - Natural ventilation

KW - Buoyancy

M3 - Article in proceeding

SN - 9789529989812

BT - Proceedings of Roomvent 2007

A2 - Seppänen, Olli

A2 - Säteri, Jorma

PB - FINVAC ry

ER -

Heiselberg P, Li Z. Experimental study of buoyancy driven natural ventilation through horizontal openings. I Seppänen O, Säteri J, red., Proceedings of Roomvent 2007: Helsinki 13-15 June 2007. FINVAC ry. 2007