1 Aug 2015
€ 2.476.158/ € 1.442.784
ENERGY SAVINGS IN BUILDING COOLING BY TILES SHAPE OPTIMIZATION TOWARD A BETTER ABOVE SHEATHING VENTILATION
In Mediterranean regions, the solar radiation in summer cause an overheating of the building envelope (roof and walls) and then of the indoor and the need for air-conditioning. Passive systems to limit solar effect mainly consist of ventilated facades and roofs. Roof is the most exposed element to solar radiation and this causes excessive heating of the attic and other rooms. Vented roof is capable to provide a discrete benefit for the disposal of heat due to solar radiation, but its performances are highly dependent on roof exposure and especially to its perpendicular direction to the wind.
The benefit of the so-called Above Sheathing Ventilation significantly decreases when the wind direction shifts from perpendicular to parallel to eaves line. ASV affects positively the thermal insulation thanks to convective heat transfer. Natural component linked to buoyancy-driven forces becomes irrelevant even with a very weak wind, while the air permeability of tiles determine an increase of the performances. Thus, vented tiled roofs could be considered the best solution for passive thermal building insulation in hot and mild climates.