Ventilazione intra-tegole per il raffreddamento dei tetti

A research promoted by the TekneHub Laboratory of the University of Ferrara has compared the summer performances of two different pitched roofs. Purpose was to evaluate the thermal flows due to solar radiation entering through the roofs and the consequent energy needed for air conditioning in order to maintain the temperature setpoint in the two rooms below the roofs and the same level of indoor comfort. It is well known that under tile air movement allows a temperature reduction of the air, a consequent reduction of the incoming heat flow and a reduction of energy needed for cooling. This research aimed to measure the benefits of the air moving from eaves to ridge line and the contribution of the air entering between the overlap lines of the tiles too. Two roofs were built, one with tiles laid on a normal dual wood battens layers, the second with tiles directly laid on the roof deck, eaves and ridge lines sealed with polyurethane foam and overlaps between tiles sealed with a membrane, so that to avoid any air circulation under the tiles. Data highlights how the simple presence of the air circulation in the free space under the tiles allow a great disposal of heat due to solar radiation.