Natural Ventilation through Large
Openings - Measurements at Model Scale and Envelope Flow Theory
D.W. Etheridge
School of the Built Environment, University of Nottingham, Nottingham, UK
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Abstract
An overview is given of the
current position regarding the use of wind tunnel modelling and envelope flow
theory for determining natural ventilation through large openings. The overview
is, to a large extent, a personal one and is illustrated primarily by recent
research carried out in Nottingham, some of which has yet to be published in
full. Attention is focused on the following uses of wind tunnels:- direct
measurement of time-average ventilation rate; measurement of instantaneous flows
in stacks; determination of discharge coefficients for theoretical envelope flow
models; assessment of steady and unsteady envelope flow models. These are
believed to be the more important areas for research and are reflected in the
recent work carried out by the author and his colleagues.
Key words: natural
ventilation, large openings, wind tunnel modelling, time average ventilation
rate, discharge coefficients, envelope flow models, stack flow, measurements.
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