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The whole building envelope has a homogeneous appearance thanks to glass elements used as cladding and tiles. Both the facade and the roof are fully covered with PV elements...
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Solaris 416
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Architect Erika Fries
“Nobody can know that it is a solar-powered house“.
The invisible BIPV

The whole building envelope has a homogeneous appearance thanks to glass elements used as cladding and tiles. Both the facade and the roof are fully covered with photovoltaic elements where the front layer is a laser printed brown glass which hides mono-crystalline silicon cells. The PV cells hidden by the front glass which reduce the electricity production by about 39%. These modules have been specifically developed for this project.

Plan of the second and third floor

Building view

Interior view of the penthouse

Building characteristics
  • Building typology
    Residential
  • Construction type
    New
  • Year of construction
    2017
  • Energy reference surface
    815 m²
  • Energy index
    83 kWh/m²a (heating and electricity)
  • Energy labelling
    Minergie-P
Image
Architect Hermann Czech ©APA/dpa
“Technology in architecture can play an important role. It affects the overall aesthetic appearance. Architecture must take into account several aspects: satisfying each of these requirements we can achieve “objectivity”; not uniformity but the exact opposite: heterogeneity“.
Energy
Active solar surface 200m² 400m²
Active solar surface ratio <75% <75%
Peak power 25 kWp 46 kWp
Building skin application Solar tiles Cold facade
Storage Electrical battery 10kWh
Energy production
0
kWh
Source: Solaragentur, Solar Preis Publikation 2018
Self-consumption
47%
Building skin
  • Application
    Solar tiles integrated in a pitched roof.
  • Description
    Sloped concrete roof insulated with 20 cm of mineral wool.
  • U value
    0.13 W/m²K
  • Fastening system
    Continuous fixing system (aluminium tracks)
  • Other
    The open joints between the elements are 6 mm narrow and there is no frame.
  • Application
    PV cladding integrated in a cold facade
  • Description
    Concrete walls insulated with 20 cm of mineral wool.
  • U value
    0.15 W/m²K
  • Fastening system
    Continuous fixing system (aluminium tracks)
  • Other
    The open joints between the elements are 6 mm narrow and there is no frame.

Photovoltaic modules

Photovoltaic facade

  • Application
    Windows and skylights
  • Description
    Triple glazing with wooden frame
  • U value
    0.80 W/m²K

Installation of photovoltaic modules

BIPV module
  • Manufacturer
    Ertex solartechnik GmbH
  • Cell technology
    Mono-crystalline
  • Front glass type/customization
    Digital ceramic print on glass/glass BIPV modules
  • Dimensions
    Custom made
  • Specific power
    About 116 Wp/m²
Technical details

The structure of the building including the pitched roof is made of self-compacting concrete. 20 cm of mineral insulation and an extra strong as the insulating and waterproofing layer. The solar envelope of the building was created by the University of Applied Sciences of Lucern (HSLU) with Sundesign and Ertex. The GFT Fassadentechnik mounting system serves as a substructure for the PV modules. The fixing system is invisible from the outside.

Projection
Hotspot image
Vertical section of the eave connection
Hotspot image
Costs
  • Total cost of the building
    6,600,000 CHF
  • Price per m³  
    1,250/m³ CHF

Side view of the building

Parties involved
  • Owner
    Hbf futur AG
  • Architect
    Huggenbergerfries Architekten AG
  • Research partner
    Hochschule Luzern
  • Photovoltaic Installer
    Suntechnics Fabrisolar;
    Scherrer Metec AG
  • Photovoltaic consultant
    Sundesign GmbH
  • Facade installer
    GFT Fassaden AG
  • Photo
    Beat Bühler and Huggenbergerfries Architekten AG
Awards and recognitions
  • Schweizer Solarpreis 2018


    Innovation Award for building-integrated photovoltaics

  • Publications
    Solaris #01, Ein Silberstreifen am Horizont, Heftreihe von Hochparterre und EnergieSchweiz, 2018


    Ein Haus, keine Maschine.
    Baumeister 07.2018 (only in DE)


    Wasser, Licht und Raumfigur.
    Modulor 05.2018 (only in DE)


    Seismograf des Himmels.
    tec21 46/47.2017 (only in DE)

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