Japanese construction company Shimizu has opened its new headquarter building in Kyobashi, Chuo-ward, Tokyo.
The building is 22 storeys high with three lower ground floors and a floor area of 51,355m².
The company claims that the new building is the world’s least CO2-emitting building with a figure of 38 kg/m² per year, which is on average 62% less than ordinary buildings in Tokyo.
The building features an air conditioning system that uses radiant heat and water hoses that run under ceiling boards like capillary vessels.
The temperature of the ceiling board surface is reduced by controlling the temperature of the water circulating in the hoses.
A surface temperature of about 20 degrees will absorb the heat of the employees working in the office through a radiant effect, which can reduce CO2 emissions by 30% compared with conventional air conditioning systems.
Energy efficient technology and motion sensors are incorporated in the LED lighting to make the lighting system in the building consume less energy.
About 2,000m² of photovoltaic (PV) panels have been installed in the exterior of the building to generate 84,000kwh of power per year, which will in turn be used for lighting in the daytime.
Window shades have been installed in the building to allow sunlight into the offices.
The shade angle will automatically change to follow the sun and optimise natural light to reduce CO2 emissions by 90% compared with standard lighting systems.
Shimizu is planning to reduce CO2 emissions down to 70% by the end of 2015 through fine tuning of air conditioning and lighting facilities, as well as by adopting further energy saving systems.
Shimizu plans to offset the remaining emissions by creating emission rights to make the building a zero-emission building (ZEB)
Image: Shimizu is planning to reduce CO2 emissions down to 70% by the end of 2015. Photo: Shimizu Corporation.