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- Nissan's new headquarters has reduced CO2 emissions drastically and conserves energy by effectively harnessing natural resources. As a result, the building received the highest "S Rank" rating from Japan's CASBEE (Comprehensive Assessment System For Building Environmental Efficiency) organization in October 2008. In May 2008, the structure was also awarded the "Cool City" designation by Japan's Ministry of the Environment.
Natural light is maximized with a curtain-wall exterior and active use of sunlight in the central channel of the building, which is collected by five sets of condensing lenses that track the sun automatically. One of the distinctive features of the exterior is the use of window louvers, which control the amount of sunlight, contributing not only to natural lighting but also to air-conditioning energy savings.
Super-insulated glass and the louvers regulate interior temperatures. Air-conditioning energy consumption is controlled by dampers installed in the exterior wall, which automatically detect wind speed and humidity and allow fresh air to flow into the building. An additional energy-saving feature is the use of ascending air current generated by the building's central channel, which reduces energy required for ventilation systems.
Rainwater and miscellaneous drainage, including that from the kitchen, are processed and used as sanitation water and for plant watering. With the green roof system on the gallery, 11% of the total lot area is devoted to green space.
The building features BEMS, a management and control system that automates and unifies the building's overall energy conservation monitoring and control.
As a result of improvement in overall efficiency, the Nissan Global Headquarters will emit approximately 3,800 fewer tons of CO2 compared to the facility in Tokyo. (CO2 emitted in the former headquarters: 14,000 tons/year, CO2 emitted in the new headquarters: 10,200 tons/year).
