Abstract:
Most office buildings are designed to be ventilated and cooled using mechanical systems. In a temperate
climate, when the outdoor temperatures are favourable, e.g. at night, passive ventilation and cooling techniques can be
used to reduce energy consumption. Building’s thermal mass represents a way to accomplish that goal due to their
ability to retain heat. However, the portion of exposed elements in modern constructions is kept to a minimum. There
are decorative components, like the suspended ceiling, that represent an insulation between the internal occupation zone
and the thermal elements, preventing the desired thermal exchange. In this work, an innovative solution that optimizes
the night cooling phenomena is presented. It is concerned with the use of the plenum formed by the space between the
slab and the suspended ceiling for cooling purposes. The tests were carried on a reduced scale model based on
dimensional analysis and similitude criteria. The suspended ceilings used in the experiments allow the outside air to
cool the slab, therefore promoting an increase of the heat exchanged between the structural elements of the building and
the zone that needs to be cooled. The results indicate that the increased amount of exposed slab area contributes to
lower the day peak indoor temperatures.