Takenaka Corp announced July 23, 2018, that it has built the "Popular ZEB Office," which combines high-cost-performance power-saving technologies and solar panels, and acquired the certification of "Nearly ZEB (nearly zero energy building)."
Takenaka designed and constructed the headquarters office of TS Tech Co Ltd, a major auto parts manufacturer based in Asaka City, Saitama Prefecture, Japan. The certification of Nearly ZEB is based on the Building-housing Energy-efficiency Labeling System (BELS). Also, Takenaka obtained the S rank of Saitama Prefecture's Comprehensive Assessment System for Built Environment Efficiency (CASBEE).
In the architectural planning of the building, Takenaka employed horizontally-arrayed windows whose height is low on the north and south sides (Low-E glass on the south side) and heat-insulating solar panels, realizing a high heat-insulating performance, good scenery and natural lighting at the same time.
On the roof of the building, 87kW of solar panels were installed. Electricity generated is basically consumed in house and sold only when the amount of power generated exceeds the amount of power consumed (e.g. on holidays). Panasonic Corp supplied solar panels and PV inverters to the building.
With the high heat-insulating performance, control of the introduction of external air, LED lighting equipment and control of daylight, Takenaka reduced thermal load caused both in and outside the building. For the air-conditioning system and lighting equipment, the company divided the building into many, small areas (zoning) and realized automatic control by detecting the existing of humans with an image sensor.
It is a simple composition using general-use power-saving technologies, and the power consumption of the building can be reduced without a dedicated building manager or engineer.