Environmental Adjustment Systems of Honda Wako Building

Honda Wako Building(hereinafter called HWB)" is ahigh efficiency saving energyoffice building with six floorshaving 52,138-m2 of total floorarea. Honda Motor Co., Ltd(hereinafter called HondaMotor) required reducing 50 %of emission of life cycle CO2 ascompared with a standardbuilding at the design stage. Torealize energy saving building,the architectural plan has twodistinguishing characteristics.Firstly, both of whole ofsouth and north of facadeconsist of low-e coating glassesand aluminum panels. Secondly, HWB has thefollowing three atriurns, a south side atrium offive floors along the facade (Fig 2), a northside atrium of four floors along the facade anda center atrium of six floors (Fig 3). The twooffice spaces are located between three atriums.These atriums provide a thermal buffer effectagainst exterior environment with the distancebetween the office space and the windows torealize perimeter-less air-conditioning.Moreover, high efficiency centrifugalchillers and large temperatwe differentialsystem are used as energy saving systems.The above saving energy systems got resultthe annual energy consumption was 15-20%less than the average of the latest officebuildings with more than 40,000-m2 of totalfloor area in Japan (ECCJ, 2006)