Hokkaido’s 1st Net Zero Energy Building Uses Solar Power, Underground Heat

Ariga Planning Co Ltd (Sapporo City), which deals with geothermal systems, etc, built its new office building equipped with a solar power generation system and other facilities.

The company realized Hokkaido’s first ZEB (net zero energy building), which achieves a power-saving rate of 100% or higher, it said.

Ariga Planning introduced (1) heat-insulating external walls using an urethane foam heat-insulating material, (2) Low-E multi-layered glass windows, (3) LED lighting equipment that is controlled in accordance with the existence of humans, (4) BEMS (building energy management system), etc.

Moreover, by using underground heat and well water heat for cooling/heating systems, the company drastically reduced the amount of energy consumed by air-conditioning systems, which accounts for most of the energy consumption of the building.

Panasonic Corp supplied solar panels, PV inverters and storage batteries for the building. The total capacity of the installed solar panels is 50.8kW. The capacities of the batteries for the power system and lighting equipment are 20kW and 11.2kW, respectively. Electricity generated is consumed in house.

The four-story building has a steel-based structure and a total floor area of 644m2. The rate of primary energy reduction is 56.0% excluding the effect of the solar power generation system and 106% including the effect. Ariga Planning will promote the use of ZEBs by using the new building as an exhibition site for ZEBs.

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