Honda Wako Building

Last Uploaded: January, 2010

Perimeter-less air conditioning


Comparison of perimeter heat loads

High-performance low-e glass has been adopted for the exterior glass of the north and south atriums. These atriums face the exterior wall, resulting in perimeter-less air conditioning and a significant reduction in air conditioning load.

Realization of environmental adjustment systems for each season


Natural ventilation system

The thermal buffer spaces of the south and north atriums have three environmental adjustment systems. One is a discharge system of hot air near the ceiling in summer. Another is a prevention system of cold draft along the windows in winter. The third is a natural ventilation system with remote operation and outdoor climate sensors to reduce cooling load in spring and autumn. To ensure the thermal buffer effect, airflow from linear fans installed in the floor facing south and north atriums between the office spaces and atriums block thermal effects from the atriums.

・Summer

If the temperature at the top of the south atrium exceeds a set value, exhaust air fans are operated to discharge hot air. The volume of second and third floor return air reduction balances the volume of hot air discharge.

・Spring and autumn

Natural ventilation and night purge is operated to open windows at the bottom and top of the atriums. Motorized ventilating openings are installed at the bottom of the south and north atriums, and, at the top of each atrium, “Natural Ventilation Recommended" is displayed on the central supervisory board only when weather conditions are suitable for natural ventilation. The operation manager decides whether to operate the natural ventilation.

・Winter

Cold air near the window is collected from the suction openings at the bottom of the atriums before it flows into the office space. Alternatively, linear fans are installed in the floor fronting south and north atriums, between office spaces and atriums, to block the thermal effect of the atriums

Air control opening with an integrated room temperature sensor for VAV control


Detailed drawing of air control opening with an integrated room temperature sensor for VAV control

For VAV zoning control in the large, column-less, bright, open working space, we developed air control openings with an integrated room temperature sensor that is incorporated into the face of each air outlet and detects the room temperature from induced air.

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These cases are described based on assessment results obtained using CASBEE.
CASBEE is a method for rating the environmental performance of buildings using Building Environmental Efficiency (BEE) as an indicator, which is based on the results of separate scores obtained for Q-1~Q-3 (Quality) and LR-1~LR-3 (Load Reduction).