Japan Sustainable Building Database

Use of daylight for north side classrooms

State of north side classrooms

Taking into account noise from the main road south of the school, trees were planted along the school's south side and a bicycle parking area was provided to dampen the noise. Ordinary classrooms are placed on the north side facing the field. Uniform illumination distribution is maintained through a combination of stable north side daylighting and Hf lighting equipment with a lighting control function, which was proven by measurement throughout the year to have reduced the power consumption by about 25% per classroom.

Natural ventilation of classrooms via an atrium

Natural ventilation louver at the top of atrium (outside)

Heat accumulation space over the top of each atrium and side louvers which automatically open and close with the aid of a sensor ensure natural ventilation from ordinary classrooms to the atrium. As a result, students can study in the classrooms without air conditioning on most days during the intermediate seasons. The atriums help the school teach classes without air conditioning for about 60% of the annual school hours.

Cool & heat tube

Inside of cooling & heating tube

For the gymnasium, a cooling & heating tube is used, which is capable of warming and cooling the outside air by making it pass through an equipment piping pit. The results of measurement carried out throughout the year show that the temperature rise of the outside air by up to 6°C from 5°C and fall by up to 2.5°C from 30°.

Reuse of rainwater

Installation of filtrating units

Rainwater falling on 2,300 m², or about 2/3, of the roof area of the gymnasium is recycled for part of the flushing water for toilets. Rainwater passes through the roof drain and is stored in the drain water storage tank underground beneath the gymnasium. It is then filtered through the filtrating unit installed inside the machine room and conveyed to the reclaimed water tank. As a result of the recycling of rainwater, more than 30% of the flushing water for toilets is supplied by rainwater.