Achieving carbon neutrality through renewable energy use: Takasago Thermal Innovation Center

This facility proactively utilizes renewable energy that takes advantage of the characteristics of the region. By combining groundwater heat, biomass CHP (combined heat and power generation/see later page), and solar power generation with a large-scale storage system to achieve high efficiency, the office building has achieved zero CO2 emissions during operation (CO2 emissions taking into account power generation: -159 tons/year).
In addition, by using groundwater heat and biomass CHP as heat sources, we have reduced not only CO2 but also the amount of fluorocarbon gas used, minimizing the environmental impact.
This optimal control of energy generation and storage/discharge has made it possible to go off-grid (a state in which electricity self-sufficiency is achieved).We believe that this result will be particularly useful in Japan, where there is a demand for stronger resilience against natural disasters.

① [Newly developed technology] Energy management system for large-capacity storage batteries

This facility has developed and introduced a new energy management system (EMS) that optimally controls the large-capacity storage batteries. The system predicts the power load and solar radiation on the premises for several days in advance, and optimally controls the storage battery charge/discharge based on the predicted power generation from solar power generation and biomass CHP. This has made it possible to move the office building off-grid, making it possible to operate the facility without relying on an external power grid.

② [Newly developed technology] Direct use of groundwater heat, which is effective in saving energy in heating and cooling
Two air conditioning systems

Aiming to proactively utilize renewable energy, we have developed and introduced two air conditioning technologies that utilize groundwater heat.

(1) Radiant panels for system ceilings
Generally, ceiling radiant panels are uniformly controlled indoors, but here we developed a system that finely controls according to the load distribution. This reduces the power required to transport hot and cold water, and controls the water supply according to the surface temperature of the panels.

(2) Three types of personal air conditioners
We developed a personal air conditioner that can adjust heating and cooling to suit the individual's thermal sensation. Actual operation data (survey on thermal environment satisfaction targeting workers who use personal air conditioners in their work spaces) confirmed high evaluations.

■ ASHRAE Technology awards: Global environmental building technology awards

The ASHRAE Technology Awards (held annually since 1999) are the world's largest technology awards for innovative environmentally friendly buildings that combine energy conservation, comfort, and user health. The awards are highly trusted by people involved in the construction and facility industries, as they require evidence of actual operation data in addition to performance at the time of design.
This time, the Takasago Thermal Innovation Center was selected as the regional representative from 15 regions around the world (announced in August 2011) and competed in the main judging as the representative for Asia, winning second place in the selection for the World Grand Prize.