The building envelope is a key element to ensure optimal energy efficiency conditions and adequate levels of comfort within. In this context, transparent components play an important role: the structural glazing systems are the weak element of the casing in terms of mechanical resistance, thermal and acoustic insulation. In the present paper new structural glass panels with granular aerogel in interspace are investigated from different points of view and preliminary results are reported. In particular, the mechanical characterization was carried out in order to assess the resistance to bending of the single glazing pane. To this end, an alternative configuration of the coaxial double ring test was studied to predict the fracture strength of the glass. The thermal and lighting performance of an innovative double glazing façade with granular aerogel is evaluated through in-field experimental campaigns. To this end, an experimental field at pilot scale was developed: it is composed of two boxes of about 1.60 m x 2 m x 2 m high and of an external weather station installed on the roof of the Department of Engineering at the University of Perugia. The rooms, identical in terms of size, construction materials, and orientation, are equipped with a two-wing window in the south wall surface: the first one (Reference Room) has a standard glazing solution (double glazing with air in interspace), the second room (Test Room) is equipped with the innovative double glazing system with aerogel. The indoor mean air temperature and the surface temperature of the glass panes were monitored in a preliminary experimental campaign (winter 2018). Also the illuminances in two different points were measured for the lighting characterization. Finally, the thermal-energy and lighting properties of the glazing systems (both the conventional and the innovative one), obtained from the in-situ experimental measurements, were used in order to developed dynamic simulations. Two case studies were chosen in order to evaluate the effectiveness of the aerogel from the energy point of view. In both the cases, the innovative system reduces significantly the winter heating demands and allows the improving of the energy class of the buildings. In summer no benefits are obtained from the installation of the aerogel system.
A multidisciplinary approach to the study of structural glass panels: Preliminary results
G. Bidini;L. Barelli;C. Buratti
;E. Speranzini;G. Castori;E. Belloni
2019
Abstract
The building envelope is a key element to ensure optimal energy efficiency conditions and adequate levels of comfort within. In this context, transparent components play an important role: the structural glazing systems are the weak element of the casing in terms of mechanical resistance, thermal and acoustic insulation. In the present paper new structural glass panels with granular aerogel in interspace are investigated from different points of view and preliminary results are reported. In particular, the mechanical characterization was carried out in order to assess the resistance to bending of the single glazing pane. To this end, an alternative configuration of the coaxial double ring test was studied to predict the fracture strength of the glass. The thermal and lighting performance of an innovative double glazing façade with granular aerogel is evaluated through in-field experimental campaigns. To this end, an experimental field at pilot scale was developed: it is composed of two boxes of about 1.60 m x 2 m x 2 m high and of an external weather station installed on the roof of the Department of Engineering at the University of Perugia. The rooms, identical in terms of size, construction materials, and orientation, are equipped with a two-wing window in the south wall surface: the first one (Reference Room) has a standard glazing solution (double glazing with air in interspace), the second room (Test Room) is equipped with the innovative double glazing system with aerogel. The indoor mean air temperature and the surface temperature of the glass panes were monitored in a preliminary experimental campaign (winter 2018). Also the illuminances in two different points were measured for the lighting characterization. Finally, the thermal-energy and lighting properties of the glazing systems (both the conventional and the innovative one), obtained from the in-situ experimental measurements, were used in order to developed dynamic simulations. Two case studies were chosen in order to evaluate the effectiveness of the aerogel from the energy point of view. In both the cases, the innovative system reduces significantly the winter heating demands and allows the improving of the energy class of the buildings. In summer no benefits are obtained from the installation of the aerogel system.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
