Transient natural ventilation of a space with localised heating

Fitzgerald, Shaun D. and Woods, Andrew W. (2010) Transient natural ventilation of a space with localised heating. Building and Environment, 45 (12). pp. 2778-2789. DOI 10.1016/j.buildenv.2010.06.007

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Abstract

The natural ventilation of a well-mixed, pre-heated room with a point source of heating, and openings at the base and roof is investigated. The transient draining associated with the room being warmer than the exterior combined with the convective ow produced by the point source of heat leads to a fascinating series of transient ow regimes as the system evolves to the two-layer steady-state regime described by Linden, Lane-Ser_ and Smeed [1]. As the room begins to ventilate, a turbulent plume rises from the point source of heat to the ceiling, and typically forms a deepening layer of hot air. However, with a weak heat source, then at some point the ascending plume will intrude beneath the layer of original uid. Otherwise, the ascending plume always reaches the top of the room as the system evolves to a steady state. We develop a simpli_ed model of the transient evolution and test this with some new laboratory experiments. We conclude with a discussion of the implications of our results for real buildings.

Item Type: Article
Uncontrolled Keywords: 2010AREP; IA61; BPI;
Subjects: 99 - Other
Divisions: 99 - Other
Journal or Publication Title: Building and Environment
Volume: 45
Page Range: pp. 2778-2789
Identification Number: 10.1016/j.buildenv.2010.06.007
Depositing User: Sarah Humbert
Date Deposited: 21 Jul 2010 14:48
Last Modified: 23 Jul 2013 09:57
URI: http://eprints.esc.cam.ac.uk/id/eprint/1491

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