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LONG HOUSE IN HENZA ISLAND

LONG HOUSE IN HENZA ISLAND
LONG HOUSE IN HENZA ISLAND
LONG HOUSE IN HENZA ISLAND
LONG HOUSE IN HENZA ISLAND
LONG HOUSE IN HENZA ISLAND
LONG HOUSE IN HENZA ISLAND
LONG HOUSE IN HENZA ISLAND
LONG HOUSE IN HENZA ISLAND
LONG HOUSE IN HENZA ISLAND
LONG HOUSE IN HENZA ISLAND
LONG HOUSE IN HENZA ISLAND
LONG HOUSE IN HENZA ISLAND
Architect
Toshiaki Kawai / Kawai-Architects
Engineers/Specialists
Masakazu Taguchi / TAPS (Structural Engineering), Hiroyuki Yamada / ymo (Environmental Engineering)
Location
Asia and Australia - Japan - Uruma,Okinawa
Climate Zone
temperate
Design status
build
Date of completion
2005
Type
Mixed use
Site area (m²)
1779.96
Footprint (m²)
834.91
GFA (m²)
697.81
NFA (m²)
1244.12
NFA/GFA
1.783
Density
0.392
Gross Volume (GV) (m³)
3908.18
Building Costs
2070000 EUR
Building Costs / m² GFA
2966.424
Building Costs / m² NFA
1663.827
Building Costs / m³ GV
529.658
Primary Energy (kWh/m²a)
80
Heating Energy (kWh/m²a)
10
Cooling Energy (kWh/m²a)
10
Cooling / Heating-System

Air cooling heat pump system

Use of renewable ressources - low tech
natural cross ventilation, evapoartive cooling, use of high thermal mass, others
Use of renewable ressources - high tech
heating pump
Key Sustainability aspects
vernacular building strategies, public spaces, accessability for disabled, renewable building materials, recycling and reuse, ecological building materials, innovative bulding materials, integrated planning process, participation of users in planning process, low cost design, zero energy design
Sustainability rated
Other
Social and ethical responsibility

After W.W.2, in Okinawa, reinforced concrete has been a dominant architectural material from geo-political reason, and most of these concrete buildings are without insulation from economical reason. Naturally they have terrible behavior from thermal point of view. "Long house in Henza" demonstrates a new model for region by using only wood, soil and plants to "slow" thermal behavior of (thermally heavy) concrete buildings.

Ressource efficiency and environmental impact

Roof cooling system use only natural vaporization. Basically no energy except natural sunlight, wind and water are necessary to run this system. Water to be spread over grass-soil roof is rainwater, which is collected and stowed in underground tank.

Economic lifecycle perfomance

Because of the benefit from grass-soil roof, there are no mechanical air conditioning systems in common space (2nd floor). In Okinawa, which has the hottest climate in Japan, reduction of energy for cooling system can contribute to save huge amount of energy.

Contextual performance and impact

Although the volume of the building (total floor area is approximate 1000sqm) is big in neighborhood, this building fit to the context of the region, because of the material for roof and wall. Cider wood is a most popular material for traditional Okinawa house. And grass roof is an alternative for traditional straw roof, which has been quite popular in Okinawa before W.W.2.