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On the effect of distributed cooling in natural ventilation

Published online by Cambridge University Press:  26 March 2008

S. R. LIVERMORE  and
A. W. WOODS
S. R. LIVERMORE
Affiliation:
BP Institute for Multiphase flow, University of Cambridge, Cambridge, CB3 0EZ, UK
A. W. WOODS
Affiliation:
BP Institute for Multiphase flow, University of Cambridge, Cambridge, CB3 0EZ, UK
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Abstract

We examine the natural ventilation flows which develop when a low-level heat source interacts with a distributed zone of cooling at high level in an enclosed space. We develop some new analogue laboratory experiments in which we use a saline plume to model a localized heat source and a heated plate to model a distributed source of cooling. The experiments show that in a building with a low-level point source of heating, a two-layer steady stratification develops in which the depth of the lower layer decreases as the intensity of the cooling at the ceiling increases. We develop a theoretical model which accounts for the penetrative entrainment across the interface associated with the convection in the upper layer. We show that this becomes more dominant as the cooling increases and eventually the room becomes well-mixed. We discuss the role of such distributed cooling on the design of natural ventilation and its ability to provide sufficient flow and adequate temperature control.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 600 , 10 April 2008 , pp. 1 - 17
Copyright
Copyright © Cambridge University Press 2008

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