Ventilation chimneys and air-handling units in the roof serve the studios. Below: the chimneys rise prominently from the structure >
because of the site’s proximity to Heathrow. The building’s eight studios have strict acoustic criteria
of Noise Rating 25, which makes them significantly less noisy than the NR 38 of a typical office. To eliminate external noise, the studios are housed within a large concrete box that is enclosed within a second, larger concrete box but isolated from it on rubber mounts. Arup’s ventilation solution has been to use the studio’s box-within-a-box construction to its advantage. From street level, air is supplied through a giant, acoustically lined labyrinth constructed between the underside of the studio’s concrete floor and the floor of the surrounding box.
This form of construction allows the air paths to be
big enough to minimise resistance to air movement. To eliminate all noise, the labyrinth is designed to ensure sufficient attenuation before the air enters a studio. Air is supplied through grilles mounted on up-stands at the foot of three of the studio’s walls; a solution that will ensure the ventilation will still function even if a set is positioned in front of the wall. ‘We did a lot of computational fluid dynamic stuff to demonstrate how the solution would work,’ says Beaven. Exhaust air is less of a problem. Once inside the
studio, air is warmed by the lights (which emit up to 500 W/sq m of heat), four cameras and other equipment. This waste heat drives the system. The warmed air rises to the ceiling, seven metres above, from where it is drawn 40 metres up to the building’s roof by one of 13 giant chimneys. As the air rises, it pulls in cool fresh air through the attenuated underfloor ducts. Nine ventilation chimneys line the building’s eastern
30 CIBSE Journal February 2011
www.cibsejournal.com
Christian Richters
Christian Richters
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