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Eine plattform von: LogoInstitute for Renewable Energy
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IEA PVPS Task 15 project aims to create an enabling framework to accelerate the penetration of BIPV products in the global market of renewables.
Operazione co-finanziata dall’Unione europea, Fondo Europeo di Sviluppo Regionale, dallo Stato Italiano, dalla Confederazione elvetica e dai Cantoni nell’ambito del Programma di Cooperazione Interreg V-A Italia-Svizzera
The PV system is integrated into the shading canopy applied to a tourist accommodation, hosting a restaurant, placed in Piz de Plaies. The solar canopy has a distinctive and original spiral structure exposed on a steep wooded slope of Val Badia, at an altitude of 1622 m.
The BIPV system consists of semi-transparent trapezoidal PV modules running around the building roof with a uniform inclination and partially shading the terrace. The photovoltaic canopy is a modern structure harmoniously and elegantly integrated into the natural environment of a region bound to the traditional Ladin culture and language.
The BIPV system has been designed to have an annual electricity production of about 7,800 kWh to cover almost the whole building electricity demand. It feeds additional energy into the grid (Augustin Clement). Thanks to the modules' semi-transparency, the photovoltaic roofing system allows part of the sunlight to enter through the structure, contributing to the heating of the canopy, which is an enclosed space.
The 40 semi-transparent modules (Ertex VSG 140-211) were customized in order to match the building shape. Moreover, they had to get the specific texture and mechanical resistance as UNI7696 (Ertex Solartechnik GmbH). The modules are composed of laminated safety glass, encapsulating polycrystalline cells 2 cm spaced out. They are supported by a timber load-bearing structure, specially designed according to the modules’ shape. The structure beams hide the module’s fixing system and the cables from people staying below. All the electric connections are made of special UV-resistant cables. They are protected with waterproof ducts.
After discovering some interesting examples of BIPV installations at an Austrian exhibition, the restaurant owner, Augustin Clement, decided to apply the photovoltaic technology. He wanted to integrate it into the building in order to create an installation visible to all the visitors, aesthetically attractive and functionally useful also as a shading device. Even though the building is placed into a mountain environment, introducing an innovative element as a BIPV system did not raise any problem getting the planning permission from the public administration (Augustin Clement).
Ütia da Ju represents an exemplary case of a retrofit, where a complex structure bearing the integrated PV plant was applied after the building construction. The particular configuration of the solar canopy implies a great attention to details and specific construction solutions. The BIPV system has to guarantee the same functions as the traditional roofing system, e.g. water tightness, resistance to snow loading, to atmospheric agents, to fire, etc. It required an accurate design process which also took into account the aesthetic viewpoint. Finally, it resulted to be an expressive architectural element thanks to the module’s aesthetic appearance and the shading effect under the structure. The solar canopy covers an area which was equipped to accommodate the restaurant customers that can appreciate the attractive atmosphere.