VAT83 in Gladsaxe is a five-storey, multi-purpose house spanning 16,900 sqm. In the center of the house is a large atrium, surrounded by two L-shaped buildings, with offices, meeting rooms, kitchenettes, etc.
From the two entrances, located east and west respectively, visitors enter the atrium, which is the heart of the house. In the atrium, there is a reception and cafeteria along with various public areas.
The atrium and the office premises (a combined area of approx. 12,700 sqm) are ventilated by natural ventilation. Ventilation is achieved through automated windows located in the facade of the offices and in the roof over the atrium.
The automatically controlled façade windows are 400 mm tall and located approximately 2m above floor level to avoid draughts in the office areas. In the atrium ceiling, 50 skylights are installed, that can be controlled automatically depending on the need for fresh air for the office areas and atrium.
The office areas are divided into 60 ventilation zones, all of which are controlled individually based on indoor climate measurements and outdoor temperatures. The windows in the 60 office zones and the roof lights in the atrium are furthermore controlled depending on the wind's impact on the building. The intelligent control is based on Computational Fluid Dynamics Calculation (CFD calculation) that constitutes an essential part of the ventilation control strategy.
The overall principle of the ventilation strategy is that fresh air is led to the open office areas via the highly placed, narrow facade windows. From the offices, the warm, used air flows to the atrium, where it rises upwards to escape through the skylights.
In each zone, panels are installed so users are able to manually override the automatic control system. This allows users to change the position of the window if more or less fresh air is desired. After 30 min., the system switches back to automatic operation.
In addition to natural ventilation, WindowMaster controls the external solar shading, which consists of approx. 200 screens. It is the sun's influence on the facades that determines whether the screens are up or down. For changes in the lux value on the facade, e.g. at a short period with cloudy conditions, there is a time delay so that too much activity with the screens and concormitant and disturbance for the people inside the building is avoided. This also means that the screens do not close immediately when then sun returns.
All automatically controlled skylights and façade windows on the ground floor and on the 1st floor are incorporated into the house's smoke ventilation strategy.
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