Developments in Wind Tunnel Studies for Estimating the
Cross Ventilation Potential for a Low-Rise Building in a Built-Up Area
Bin Su
School of
Architecture, UNITEC Institute of Technology, Auckland, New Zealand
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Abstract
To accurately estimate the natural wind driven
ventilation potential of a specific low rise building in a densely
shielded or built-up area under local wind conditions, it is necessary to
have site wind frequency data, pressure coefficient data, details about
the windward and leeward openings of the building and the data related to
building design. This paper summarises the appropriate data and discusses
how to obtain these in order to estimate the natural cross ventilation
potential of such a low-rise building. While building and weather
information are relatively easy to obtain, a fundamental issue is the need
to determine the wind pressure coefficient. Although published data are
available, these are often not sufficient to satisfy the particular needs
of individual building geometries exposed to specific surrounding
shielding patterns. In these instances, wind tunnel analysis remains an
important tool. However, small scale models are required in order to
incorporate sufficient surrounding terrain. In the past, scaling has been
hampered by the need to include an array of pressure taps on each face of
the scale model. By using hook type surface mounted pressure taps, as
outlined in this paper, it is possible to reduce scale size. This greatly
improves the ability of wind tunnel models to simulate the local
environment around buildings for cross-flow analysis. Such data also has
application in more complex studies involving air quality and
computational fluid dynamics analysis.
Key words: wind driven ventilation, natural ventilation, wind
tunnel models, wind pressure coefficient, wind pressure measurement.
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