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Natural Ventilation Strategy

From the onset of planning, Manitoba Hydro is providing 100 % fresh air in contrast to North American office building that recirculates the air. The building is oriented toward south so the prevailing wind can naturally ventilate the structure. The building provides direct outside air regardless of the season as well as the individual control for the occupants.

The interior of curtain wall is manually operable and allows occupants to control their environment while the exterior has automated wall vents to adjust the temperature and airflow.

Left: shading strategies

Fig. 7.8 Left: shading strategies: double-skin facade with motorized shade, © photo by Terri Boake, Right: daylight analysis of the offices, © M. Keramati

The natural ventilation strategy of the building is provided by a double-skin fa?ade system, which supplies air to the offices, and a series of six-story winter gardens. They draw the air and precondition it before it enters the office spaces through vents in the raised floor. The 115-m tall solar chimney on the north side exhausts the returning air rising from the occupants and other sources in the offices. In winter, the solar chimney draws exhaust air down to heat the parking and pre-heat incoming cold air from the winter gardens.

In the shoulder seasons, the building only provides fresh outdoor air through the use of automatic and manually operated windows (Fig. 7.9).

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