Innovative ventilated envelope elements for solar heat recovery in low energy buildings

Several measurements were performed on an innovative perforated solar wall. It is made of metal cladding with perforations, installed at several tens of centimeters from a building wall, thus creating a cavity, heated by the solar radiation from the sun. Ventilation fans create negative pressure in the cavity, drawing in the solar heated air through the perforated panel. The results found in literature were compared with experimental results. A good agreement was found. In the CFD study, changing the geometry of the perforations will increase on one hand the perforation’s perimeter and it would generate complex fluid dynamics, resulting in a higher efficiency of heat recovery of these devices.