Analysis of the Energy Performance of a New Opaque Slim Multifunctional Façade Module

Curtain Wall Façades (CWF) represent the most common vertical envelope solutions for non-residential buildings. To be adapted to different climates and building typologies, CWFs alternate transparent (visual) modules and opaque (spandrel) elements to create a variety of design alternatives that might combine different Window to Wall Ratio (WWR). Nevertheless, especially for the opaque components, to be compliant with the local energy regulations, thick insulation layers have to be installed back to the glazing units, thus reducing the indoor space and to a certain extent interfering with the aesthetical value of the façade. To improve the building energy efficiency while increasing the indoor environmental quality, new multifunctional opaque adaptive façade solutions with high technological integration are currently under development. In the framework of the Horizon 2020 Project Powerskin+ a new concept of opaque slim multifunctional façade modules which combine super insulation (Vacuum Insulation Panels), energy harvesting (Perovskite PV), latent heat storage capabilities (Phase Change Materials), and heat generation (electric heating foil) is under development. A preliminary assessment of the thermal behaviour of different spandrel panel design alternatives, all characterised by low thickness (<75 mm), was performed by means of dynamic thermal simulation in WUFI® Plus software. In this study, the heating and cooling energy need of a single office was evaluated. The simulation results allow proving the effectiveness of the designed concept, which have demonstrated a significant reduction of the heating and cooling need, if compared to state-of-the-art spandrel panels. The outcomes of this preliminary simulation activity have also highlighted that the implementation of advanced control strategies represent an essential step for a large exploitation of the performance of this type of multifunctional façade elements.