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Exposed surface

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Radiative and convective cooling of space by flat, profiled or coffered exposed surface (normally soffit)

Suitable for use with natural ventilation

Partial thermal exposure possible with open cell or perforated tiles

Slab could be cooled by imbedded water pipes rather than night cooled

Ventilated floor/ceiling void

Convective cooling of supply/ recirculation air in void

Relatively low performance

Often used in combination with exposed surface

Enhanced surface heat transfer

High rates of convective cooling of supply/recirculation air by creating turbulent air flow at surface in floor/ceiling void

Hollow core

High rates of convective cooling of supply/recirculation air by passing air through cores in slab

Typically used with exposed surface

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