Kansai Electric Power Building

Best case for CASBEE

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

Project Outline

This building was designed to house the Head Office functions of Kansai Electric Power Company. Built as Phase I of the “Nakanoshima 3-Chome Joint Development Project”. One of the basic concepts for this building is a "model building for environmental symbiosis". In areas around windows, the outer frames (columns, beams) protrude by about 1.8m outwards from the window surface. This not only constitutes a shaded exterior but also provides functions such as a natural light intake from the large window surfaces, shielding of sunlight by the canopy, introduction of natural ventilation via the eaves, and space for installation of solar panels. Besides these, we have also introduced a task-ambient air conditioning system, internal heat storage and other technology for environmental symbiosis. The building also features a “communication well” (a three-floor atrium in the high-floor office zone), the aim of which is to communicate widely.Basic Information

[CASBEE rank]	S ()
[CASBEE tool used]	CASBEE for New Construction (2006 edition)
[Location]	Osaka City, Osaka Prefecture
[Completion date]	December, 2004
[Site area]	21,089 ㎡
[Total floor area]	106,484 ㎡
[Structure]	S / part SRC / RC
[Floors]	5 basement levels / 41 floors above ground
[Owner]	Kanden Fudosan Co., Ltd. , Kansai Electric Power Co.,Ltd
[Designer]	Nikken Sekkei Ltd. / NEWJEC Inc. JV
[Contractor]	(Construction) Takenaka / Obayashi / Konoike Construction / Asanuma / Zenitaka / Okumura JV (Electricity) Kinden / Kansai Tech / Kanden Kogyo / Sumitomo Densetsu JV (Climate Control Equipment) SANKI Engineering / Kinden / Takasago Thermal Engineering / Shinryo JV (Plumbing, drainage and sanitary Equipment) Sanko Air Conditioning / Dai Dan JV (Precast Concrete Panel) Kinki Concrete Industries Co.,Ltd.

Awards

• 2nd Sustainable Architecture Awards: IBEC Chairperson Prize (IBEC, February 2008)
• 45th SHASE Awards: Technical Prize, Architectural Facility Section (SHASE, May 2007)
• 18th IEIEJ Awards: Facility Prize, Technology Section (IEIEJ, June 2007)

Special Features

Q-1 Indoor Environment	Eco-frame (canopy) Task / ambient air conditioning Uses illuminance sensors cut-away ceilings by windows External air inlet volume 30m³ / person / h Natural ventilation inlet area 10.4m2 / floor
Q-2 Quality of Service	OA floor 200mmH Power source capacity 50VA / ㎡ Compliant with Heart Building Law Ceiling height 2.8m Floor height 4.3m Communication well Strong aseismic performance Vibration control equipment Granite inlaid precast concrete panels used as exterior materials Backup power and heat sources for important facilities Rainwater use system Recycling of domestic wastewater Floor load tolerance 4900N / ㎡ EPS only for IT
Q-3 Outdoor Environment on Site	Exterior passage offering a wide field of vision Lighting served for night-cityscape Open-use around the entrance space and Lower-4 floors
LR-1 Energy	PAL value 37% reduced Low-E glass Natural energy usage 47MJ / ㎡ / year, natural ventilation, photo voltaic array ERR value (integration of CEC values) reduced by 31% Introduction of e-BEMS based on PDCA cycle for energy management
LR-2 Resources and Materials	Water conservation measures, e.g. automatic faucets, imitation sound devices Water reuse system ratio 27%, rainwater recycling of domestic wastewater Inert gas fire extinguishers
LR-3 Off-site Environment	Atmospheric pollution sources eliminated by using DHC (using river water as a heat source and heat sink) Noise-reduction measures for emergency power generators, etc. Kitchen fume deodorizing filters, refrigerated food waste bins

Other Features

• Interior materials with low VOC discharge

CABEE Score

【 Q. Building Environmental Quality & Performance 】 SQ = 4.0 (SQ：Score of Q category )

LR. Reduction of Building Environmental Loadings 】 SLR = 4.2 (SLR：Score of LR category )

Eco-frame

The column / beam shape (Eco-frame) that protrudes 1.8m from the window surface not only blocks direct sunlight in summer, but also facilitates effective natural light intake as well as natural ventilation (by introducing wind directly into the rooms while mitigating strong winds along the river).
the outlet has baffle plates in the internal side of the natural ventilation chamber. This is so designed that wind introduced by natural ventilation reaches to the center of the interior of the room. Solar panels are installed on the south-facing Eco-frames on each floor, making effective use of space.

Task-ambient air conditioning system

A task-ambient air conditioning system is adopted to reduce overall air conditioning output. This includes floor blower outlets that the residents can adjust to airvolume, direction of air current and so on their own temperature requirements.
We have confirmed, through experimental simulation, that task air conditioning can effectively heat or cool task zones without creating perceptible draughts, etc.