INTERNATIONAL CASE STUDY BIOMES COOLING
Hot challenge Once the domes had been designed, the next task was to find a way of dealing with the heat loads. The design team’s goal was to make the domes’ servicing invisible to avoid the flower displays being surrounded by the clutter of louvres, chillers and air handling units. For the Flower Dome, Atelier Ten opted for
a displacement ventilation system combined with a network of chilled water pipework embedded in the concrete screeds of the paths and circulation areas. The displacement ventilation system is the primary source of cooling. Conditioned air is supplied at low level within the occupied zone. This solution limits the volume of air needed to cool the large glazed space and to keep the visitors comfortable. Even so, 110cu m /s of conditioned air is supplied through ducts which measure up to 5m x 5 m, which
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have cleverly been incorporated into the landscaping. The chilled air is supplied at a temperature of 18°C, 80% RH, (or dryer) through grilles concealed in the edges of flower beds and through diffuser bins concealed within the planting The displacement air helps to pressurise
the dome to prevent infiltration. As the air heats up it rises to the top of the dome where a proportion is allowed to disperse through openable vents. The remainder of the air is extracted, mixed with up to 20% fresh air and recirculated, or used to regenerate the desiccant that forms part of the cooling system. In addition to the air system, the dome is
cooled by chilled water pipework cast into the hard landscaping and pathways at a temperature just above the dew point of the air within the space. While the vegetation removes solar radiation by converting the
August 2012 CIBSE Journal 23
We’ve stretched every sinew to make the most of the resources at our disposal from the local climate and environment
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