Outdoor performance assessment of a super-insulated opaque façade panel integrating PV, PCM, and thermal mass activation

Curtain Wall Façades (CWF) represent a widespread envelope technology for non-residential buildings. CWFs usually alternate transparent (visual) modules and opaque (spandrel) elements to create a variety of façade design alternatives. To be compliant with the local energy regulations, thick insulation layers have to be generally installed in the opaque elements. Nevertheless, to achieve a higher integration level of the opaque façade elements with the current curtain wall stick framing systems, slim elements have to be developed. In the framework of the Horizon 2020 Project Powerskin+ a new concept of opaque slim multifunctional façade modules which combine super insulation (VIP - Vacuum Insulation Panels), energy harvesting (Perovskite PV), latent heat storage capabilities (PCM - Phase Change Materials), and heat generation (electric heating foil) is under development. In this paper, the results of a first prototype, that was preliminary tested in outdoor test cell, are presented. The experimental monitoring results allow to demonstrate the effectiveness of the façade in providing outstanding thermal insulation level. Moreover, the behavior of the integrated PCM and its thermal activation system was analyzed to have a better understanding of the PCM activation process and of the capability of the system to be adopted as a radiant wall system.