Institute for Global Environmental Strategies

Best case for CASBEE

From:http://www.ibec.or.jp

Project Outline

IGES is a think tank whose aim is to research policy-oriented or practical measures designed to solve problems of the global environment, and to concretize the results of such research via the policies of governments and local authorities as well as the actions of corporations and citizens in various countries. The design concept was to create a practical yet comfortable, highly flexible research environment that can support research spanning different sectors flexibly over the long term, bearing in mind that such research changes every few years. Another objective was to positively introduce passive technologies that draw on the superb natural environment inside the site, and to present this as a prototype for eco-friendly architecture befitting this Institute.

Basic Information

[CASBEE rank]	S ()
[CASBEE tool used]	CASBEE for New Construction (2004 edition)
[Location]	2108-11 Kamiyamaguchi, Hayama-machi, Miura-gun, Kanagawa Prefecture
[Completion date]	April, 2002
[Site area]	20,974.49 ㎡
[Total floor area]	7,408.11 ㎡
[Structure]	RC (below ground) / S (above ground)
[Floors]	1 basement level / 2 floors above ground
[Owner]	Kanagawa Prefecture, Kanagawa Prefecture Housing Supply Corporation
[Designer]	Nikken Sekkei Ltd.
[Contractor]	Kajima / Mitsui Construction / Kobai Kensetsu JV

Awards

• FY2001 Architectural Institute of Japan Design Contest (Technology Section) – Prize of Excellence for “Architectural design aiming for a 30% reduction in LCCO2 and three-fold increase in serviceable life (100-year lifespan) – Nonresidential Section”
• NEC Glass Space Design Competition – Commendation
• Architectural Institute of Japan – Selected Works (2004)
• 1st Design Award for Light & Lighting (2003)
• 3rd Environment & Equipment Design Awards (Environmental Design Section) (2005)
• Arcasia Awards 2005-2006 Gold Medal
• 31st International Illumination Design Awards
• 15th IEIEJ Awards (Development Encouragement Prize, Technology Section)
• 6th Japan Institute of Architects (JIA) Environmental Architecture Prize (General Architecture Section)

Special Features

Q-1 Indoor Environment	Double glazing Improved heat insulation Light shelf Use of daylight from diagonal ceiling with vertical louvers Automatic light control Natural ventilation via atrium using prevailing wind Smoking control
Q-2 Quality of Service	Barrier-free measures Highly flexible research space Measures for renewal of equipment and machinery Use of highly durable construction materials
Q-3 Outdoor Environment on Site	Installation of biotope pond Rooftop greenery Greenery and walking routes throughout the site Exterior space open to surroundings
LR-1 Energy	Double glazing Improved heat insulation Light shelf Use of daylight from diagonal ceiling with vertical louvers Automatic light control Natural ventilation via atrium using prevailing wind Cool heat trench Solar panels Solar heat accumulator Wind power generator Improved efficiency of equipment system using IESS Micro gas turbines Ice-heat storage heat source device Management by BMS Monitoring of energy consumption
LR-2 Resources and Materials	Rainwater / gray water reuse system Use of blast furnace cement Use of recyclable materials and low environmental load materials Use of eco-materials
LR-3 Off-site Environment	Permeation of rainwater into site Composting of waste Appropriate allocation of parking spaces

CABEE Score

【 Q. Building Environmental Quality & Performance 】 SQ = 4.4 (SQ：Score of Q category )

【 LR. Reduction of Building Environmental Loadings 】 SLR = 4.3 (SLR：Score of LR category )

Natural light intake

Using the light shelf and recycled wood vertical louvers installed on the western side, uncomfortable direct light can be screened almost completely without lowering blinds, making it possible to enjoy the superb views to the west. Light reflected from the light shelf is converted to soft dispersed light by means of the milky glass in sections between the buildings, traveling along the sloping ceiling into the back of the research space. Reflected light is also introduced from the corridor side via the atrium, assuring a natural light intake from both east and west sides.

Natural ventilation

Taking advantage of the suction effect that arises when prevailing winds from the west of the site flow along the cross-sectional shape of the building,

natural ventilation is provided

for the entire facility via the atrium. By securing ample space for hot air to gather at the top of the atrium, we ensure that the zone of temperature increase due to sunlight inside the atrium does not descend to the residential zone.