Paper 1: Volume 5 No.3 Dec 2006 Edition
What we think we know about
Ventilation
Andrew
Persily
Building and
Fire Research Laboratory, National Institute of Standards and Technology
100 Bureau Drive
MS8633,
Gaithersburg
,
MD
20899
USA
Abstract
The amount of outdoor air
ventilation in buildings is one of the most important determinants of
indoor air quality, but many critical questions and misunderstandings
exist. First, given the importance of ventilation, how well do we know how
much outdoor air is even needed in buildings? While research has been done
on ventilation and odour perception and on ventilation and symptom
prevalence, is it adequate to support the ventilation requirements in our
standards and regulations? While this research and many years of designing
and operating buildings have been used to develop ventilation requirements
in standards and regulations, these requirements treat all buildings the
same. Can we provide understandable and practical ventilation requirements
that address the tremendous variability in buildings and occupants? While
much time and effort is spent developing and debating ventilation
requirements, compliance with these requirements in design and ultimately
operation is rarely given the attention that it deserves. Addressing
actual ventilation performance in buildings requires measurement, which is
more difficult to conduct in the field than often realized and is too
often omitted from building management practice as well as indoor air
quality research. When ventilation rates are measured, the results often
reveal significant gaps between design intent and actual performance,
which can have serious implications for both indoor air quality and
energy. Given the importance of ventilation, the research that has been
done and the many questions that remain, it is reasonable to ask how much
we really know about ventilation.
Key words: Airflow,
Building codes, Indoor Air Quality, Measurement, Regulation, Standards,
Ventilation.
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Contents
Editorial
Ventilation
for Better Indoor Air Quality: Yuguo
Li
and Xianting
Li
Paper 1
Ventilation
for Better Indoor Air Quality: Yuguo
Li
and Xianting
Li
Paper
2
Performance
of Underfloor Air Distribution in a Field Setting: Fisk, W. J., Faulkner,
D., Sullivan, D. P., Chao, C., Wan, M. P., Zagreus, L. and Webster, T.
Paper 3
Applying
the Local Dynamic Similarity Model and CFD for the Study of
Cross-Ventilation: Hu, C-H.,
Kurabuchi, T. and Ohba, M.
Paper
4
Levels
of Indoor Airborne Microbes Associated with Ventilation Efficiency in
Naturally-Ventilated Residences: Su, H. J., Wu, P. C. and Chien, H. P.
Paper 5
Air
Quality and Thermal Comfort in an Office with Underfloor, Mixing and
Displacement Ventilation:
Cermak, R. and Melikov, A. K.
Paper
6
Passive
Tracer Gas Measurement of the Long Term Variation of Ventilation in Three
Swedish Dwellings: Stymne, H., Emenius, G. and Boman, C. A.
Paper
7
Validation
of a CFD Model for Research into Stratum Ventilation: Lin,
Z., Chow, T. T. and Tsang, C.F.
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