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Experimental and computational investigation into suppressing natural convection in chilled ceiling/ displacement ventilation environments
journal contribution
posted on 2011-12-20, 11:19 authored by A.H. Taki, L. Jalil, Dennis LovedayDennis LovedayThe combination of chilled ceiling and displacement ventilation systems can cause destruction of the
displacement flow pattern in some circumstances. This paper reports on the performance of a new technique
for achieving stable conditions for displacement airflow in the presence of a chilled ceiling system.
The technique is based on the attachment of a honeycomb slat system to the underside of a chilled
ceiling, thereby suppressing downward cool natural convection. Investigations were carried out using
both computational and experimental methods for a range of typical office environment conditions. The
results showed that a slat depth to width ratio of 10 could suppress the natural convection by more
than 80% when the Rayleigh number reached 7 × 106. This confirms that the technique is capable of
minimising downward cool air currents, resulting in preservation of the displacement flow pattern in
the presence of the chilled ceiling. The proposed slat system can raise the general air temperature in
the space allowing some displacement flow pattern to occur. The outcome of this study is the emergence
of a honeycomb slat-based approach for improving the performance, together with provision
of general advice for designers as regards the combination of radiant cooling/displacement ventilation
systems.
History
School
- Architecture, Building and Civil Engineering
Citation
TAKI, A.H., JALIL, L. and LOVEDAY, D.L., 2011. Experimental and computational investigation into suppressing natural convection in chilled ceiling/ displacement ventilation environments. Energy and Buildings, 43 (11), pp. 3082 - 3089.Publisher
© Elsevier B.V.Version
- VoR (Version of Record)
Publication date
2011Notes
This item is Closed Access. It was published in the journal, Energy and Buildings [© Elsevier B.V.] and the definitive version is available at: http://dx.doi.org/10.1016/j.enbuild.2011.08.002ISSN
0378-7788Publisher version
Language
- en