REFURBISHMENT CASE STUDY OFFICE BLOCK
up to 2.5C. A temperature increase of this magnitude would significantly reduce the amount of cooling available, particularly at the perimeter of the floor plates, where the system has to cope with solar gains in addition to occupancy gains. Hall’s solution is to deliver the air from
the service cores to the floor perimeters in insulated ducts concealed within the raised floors. Each of the building’s floors is divided into quarters to allow the building to be subdivided for letting. Each of those quarters is served by a riser. Hall’s solution allows the temperature and quantity of air reaching a specific floor area to be targeted precisely. It also allows air to be ducted to cellular offices, where these have been installed by tenants. Air is extracted from
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the offices at high level through grilles set into the cores, and then ducted back to the roof-mounted air handling units.
Façade Design of the building’s façade was critical for the displacement system to perform effectively. ‘We knew the maximum cooling capacity of the system, which was about 75W/sq m tops, so once we’d taken off the cooling needed to deal with the loads of a modern office, we were left with the maximum cooling load we could handle at the façade,’ says Hall. To keep the cooling load within this
limit the engineers worked closely with the project architect, Allford Hall Monaghan and Morris (AHMM), to develop a façade
May 2012 CIBSE Journal 27
The design of the building’s façade was crucial to the performance of an internal air displacement system
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