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Natural Ventilation
The natural ventilation system can reduce the power required for air circulation and provide a more comfortable indoor environment.
- Principle
Natural ventilation is an important consideration in architectural planning. The principle of natural draft and ventilation (Figure 1) consists of the following three factors:
(1) Wind pressure on building
(2) Venturi effect
(3) Chimney effect
- Effect
(1) Since natural energy is used for ventilation, the power required for air circulation can be reduced. Moreover, by replacing indoor air with cool ambient air through ventilation in the nighttime, heat stored in the building is removed while the cold is stored in the building skeleton, enabling a reduction in daytime cooling loads. This effect is shown in Figure 2.
(2) In regions subject to high temperatures and high humidity in summer, natural ventilation removes indoor moisture and lowers perceived temperature, securing comfort and health.
Figure 1 Principle of Natural Ventilation
(Source 1: "Passive System House Design" by the Institute for Building Environment and Energy Conservation, published by Maruzen Co., Ltd.)
(Source 2: "Environmental Design of Atriums" by the Architectural Institute of Japan, published by Shokokusha)
Figure 2 Effect of Natural Ventilation in Virtual Model
(Primary energy consumption per effective area)
(Source: "For Building Equipment Supporting Sustainable Society" by the Society of Heating, Air-conditioning and Sanitary Engineers of Japan)
Buildings adopting this energy-saving measure in Japan
Sapporo Kousei Hospital
Nihonmatsu Municipal Harase Elementary School
Sendai Jozenji Building
Mitsui Warehouse Hakozaki Building
Howa Seminar Plaza
Shizen-no-izumi Hannya-no-sato Ideyu-no-mori
Sumida City Hall
Meiji University Izumi Campus First Building
Rikubetsu Town Hall/Community Center
Integrated Academic Information Center
Alfort Atami
J. CITY
Kobe Bay Sheraton Hotel & Towers
Sagamihara Municipal Swimming Center
Sawara Town Hall
UNEP International Environmental Technology Centre Osaka
RITE (Research Institute of Innovative Technology for the Earth) headquarters
Niigata Prefectural Office
Tokyo Gas Kohoku NT Building
Itabashi Ecopolis Center
Tsukuba Research Institute, Banyu Pharmaceutical Co., Ltd.
Osaka Municipal Central Gymnasium
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