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Pollutant flushing with natural displacement ventilation

Hunt, G.R. / Kaye, N.B.

AbstractWe examine the time taken to flush pollutants from a naturally ventilated room. A simple theoretical model is developed to predict the time taken for neutrally-buoyant pollutants to be removed from a room by a flow driven by localised heat inputs; both line and point heat sources are considered. We show that the rate of flushing is a function of the room volume, vent areas ( $A^{*}$ ) and the distribution, number (n) and strength (B) of the heat sources. We also show that the entire problem can be reduced to a single parameter ( $μ$ ) that is a measure of the vent areas, and a dimensionless time ( $τ$ ) that is a function of B, V and $μ$ . Small-scale salt-bath experiments were conducted to measure the flushing rates in order to validate our modelling assumptions and predictions. The predicted flushing times show good agreement with the experiments over a wide range of $μ$ . We apply our model to a typical open plan office and lecture theatre and discuss some of the implications of our results.

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Pollutant flushing with natural displacement ventilation

Hunt, G.R. / Kaye, N.B.

AbstractWe examine the time taken to flush pollutants from a naturally ventilated room. A simple theoretical model is developed to predict the time taken for neutrally-buoyant pollutants to be removed from a room by a flow driven by localised heat inputs; both line and point heat sources are considered. We show that the rate of flushing is a function of the room volume, vent areas ( $A^{*}$ ) and the distribution, number (n) and strength (B) of the heat sources. We also show that the entire problem can be reduced to a single parameter ( $μ$ ) that is a measure of the vent areas, and a dimensionless time ( $τ$ ) that is a function of B, V and $μ$ . Small-scale salt-bath experiments were conducted to measure the flushing rates in order to validate our modelling assumptions and predictions. The predicted flushing times show good agreement with the experiments over a wide range of $μ$ . We apply our model to a typical open plan office and lecture theatre and discuss some of the implications of our results.

Pollutant flushing with natural displacement ventilation

Hunt, G.R. / Kaye, N.B.

AbstractWe examine the time taken to flush pollutants from a naturally ventilated room. A simple theoretical model is developed to predict the time taken for neutrally-buoyant pollutants to be removed from a room by a flow driven by localised heat inputs; both line and point heat sources are considered. We show that the rate of flushing is a function of the room volume, vent areas ( $A^{*}$ ) and the distribution, number (n) and strength (B) of the heat sources. We also show that the entire problem can be reduced to a single parameter ( $μ$ ) that is a measure of the vent areas, and a dimensionless time ( $τ$ ) that is a function of B, V and $μ$ . Small-scale salt-bath experiments were conducted to measure the flushing rates in order to validate our modelling assumptions and predictions. The predicted flushing times show good agreement with the experiments over a wide range of $μ$ . We apply our model to a typical open plan office and lecture theatre and discuss some of the implications of our results.

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Title:

Pollutant flushing with natural displacement ventilation

Contributors:

Hunt, G.R. (author) / Kaye, N.B. (author)

Published in:

Building and Environment ; 41 ; 1190-1197

Publication date:

2005-04-19

Size:

8 pages

ISSN:

DOI:

https://doi.org/10.1016/j.buildenv.2005.04.022

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

English

Keywords:

Natural ventilation , Transient flows , Pollutant flushing

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