Cooling strategies

Cooling strategies begin at the level of the site. Vegetation, especially trees, provides both shade and evaporative cooling through moisture expiration through leaves. Pools, fountains, waterfalls/cascades, sprays and other water features all add to the evaporative cooling effect. In studies of 'heat island effect' generated by buildings it was found that clusters of trees within the heat island can produce a localised drop in temperature of 2-3°C.

Chilled ceilings are a method of providing cooling not necessarily associated with air flow systems. The advantages of the system are, first, that thermal stratification affects in a room are reduced and, second, that a chilled ceiling counterbalances the effect of thermal buoyancy, that is, rising warm air. The ceiling may be chilled using a refrigerant. The more

Figure 12.14

Displacement ventilation and natural light in the Reichstag

Air plenum Air treatment

Water Source Natural Cooling Effect

Air plenum Air treatment environmentally benign method is to employ mechanical night-time cooling to precool exposed floor slabs. An alternative system involves embedding pipes in concrete floors to carry cooling water, usually from a ground source.

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