Paper 10
Natural Ventilation with Dynamic
Façades
Yuichi
Takemasa1, Masaya Hiraoka2, Masahiro Katoh1,
Katsuhiro Miura1,
Shinji Kasai2 and Tsuyoshi Oya2
1Kajima
Technical Research Institute, Japan
2Kajima Design, Kajima Corporation, Japan
Abstract
In the light of global environmental problems, it is vital for
buildings to conserve energy and make use of natural energies. Natural
ventilation is one important method for achieving this. In houses, natural
ventilation is a very attractive way to control the indoor environment.
Compared to this, mid- to high-rise buildings include many closed spaces
where windows cannot be opened and internal heat is trapped inside, which
increases the cooling load. Based on this situation, consciousness of
environmentally friendly buildings and utilization of natural energy
becomes high. Introducing fresh outside air directly into the indoors can
create a more comfortable environment for building occupants, in addition
to realizing energy savings. Natural ventilation is commonly implemented
in buildings such as homes, but its application in mid- to high-rise
buildings has been hampered by many issues such as ensuring building
performance and determining control methods. Therefore, design techniques
for natural ventilation are strongly required. Design techniques for
natural ventilation have been developed and applied to many buildings in
Japan. This paper describes the outline of the design technique developed
by the authors and introduces some examples of natural ventilation with
dynamic façades in non-residential buildings in Japan.
Key words: natural ventilation, office building, large space,
double-skin façade, cross ventilation, stack ventilation, stack effect,
field measurement, CFD analysis, Japanese examples
References
Takemasa Y, Hiraoka M, Katoh M, Tsukamoto H, Tanabe M, and Tanaka H.
(2004) "Performance of Hybrid Ventilation System Combined with
Double-skin Facade in East-Asian Temperate Climate" ROOMVENT 2004,
Coimbra, Portugal.
Takemasa Y, Togari S, and Arai Y (1996) "Application of an
Unsteady-State Model for Predicting Vertical Temperature Distribution to
an Existing Atrium". ASHRAE Transactions, 102, (1).
Takemasa Y and Moser A: (1999) "Comparison of Mechanical and
Natural Ventilation using Long-Term Evaluation Model for Indoor Air
Quality, Thermal Environment, and Energy Consumption", Indoor Air 99.
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