Describes the Basilica in Basildon, which uses interstitially cooled chilled slabs and night time cooling, with a cooling pond to deliver passively cooled water to the slabs. Explains the principles of chilled slabs, which provide cooling in the same way as a radiant chilled ceiling but make use of the thermal energy storage capacity (thermal mass) of the structure. Notes the large, central atrium which is a key factor in naturally ventilating the building and providing overnight cooling when external temperature are low enough. States the mechanical systems are intended to complement the passive design features of the building, the aim being to operate for the minimum amount of time at minimum energy use consistent with maintaining conditions. Services from individual plant rooms are supplied to six zones each with three sub-zones (floors). Notes tests carried out by BSRIA to confirm the cooling power of the slabs and the cool storage effect. Progressively, in terms of energy use, cooling is provided by a) overnight ventilation, b) overnight ventilation plus water cooling the slabs, c) chilling the slabs, depending on outside conditions and the recent thermal history of the slab. Separate plant provides cooling for continuous loads such as IT rooms. Notes the use of prefabricated modular plant rooms.
Primary Author(s): Arnold D, Othen P
Source: HAC, March 2002, 16,18,20, 1 fig.
BSRIA Abstract Doc 000103444 Abs 20020548
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