The existing single-family house was replaced by a Minergie-P multi-family dwelling. In addition to five apartments, the building also houses some...
Hofberg 6/7
  • Address
    Hofbergstrasse 21,
    9500 Wil, Switerland
  • Location
    47°28’13” N | 9°02’57” E
  • Altitude
    607 MAMSL
Solar geometry

The existing single-family house was replaced by a Minergie-P multi-family dwelling. In addition to five apartments, the building also houses offices. This seven-storey PlusEnergyBuilding (PEB) lies at the foot of the Hofberg Mountain and given the peculiarities of the terrain, it was necessary to build 7 floors, four of them above ground. Thanks to high-efficiency monocrystalline modules installed both on the roof and on the south facade, in correspondence of the floor courses, the building produces 186% of its energy demands. The facade works through the interaction between its geometry and the position of the sun according to the seasons, absorbing or shielding the solar radiation depending on the actual needs. This project demonstrates how well-insulated buildings with carefully integrated energy systems could shape architecture.

The photovoltaic covered floor courses mark off the horizontal divisions of the elevations.

Building characteristics
  • Building typology
  • Construction type
  • Year of construction
  • Gross floor area
    1,306 m²
  • Energy index
    22.9 kWh/m²yr (heating and electricity)
  • Energy labelling
    Minergie P
  • Active solar surface
    294 m² (roof); 51 m² (facades)
  • Active solar surface ratio
    50-75% (roof), 25-50% (facades)
  • Peak power
    50 kWp (roof); 8 kWp (facades)
  • Building skin application
    Flat roof, Cold facade
  • Self consumption
Energy production

Dummies (non active modules) are used on the north, east and west facades.

BIPV module
  • Product
    SPR 238E-WHT (roof), Custom-made (facades)
  • Manufacturer
    SunPower Corporation
  • Cell technology
  • Cell colour
  • Dimensions
    1559x798x46mm (SPR 238E-WHT)
  • Specific power
    238 Wp (SPR 238E-WHT)
Technical details

The combination of glass, a wooden absorber element and an insulating wall results in the Lucido® facade. This facade uses solar energy, absorbed and stored inside the element, as a natural insulation system. Lucido® is composed of few elements conceived according to the principle of modular constructions, this principle allows the adaptation of this product to all types of constructions. The absorber panel is the main element of the Lucido® system and consists of a wooden blade with a horizontal lamella structure that allows the transformation of light energy into heat. On the outside of the element is reinforced glass that allows almost all of the solar energy to pass through. The structured surface of the glass reflects the superfluous energy in summer and lets sunlight pass in winter as well as protecting the wooden panel. The wooden blade is fixed on a new or existing wall which could be masonry or wood-framed and assumes the static load role.

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Parties involved
  • Owner
    Giuseppe & Katharina Fent
  • Architect
    Fent Solare Architektur
  • Photovoltaic Installer
    Stromaufwärts-Photovoltaik, Ertex Solartechnik GmbH
  • Specialist planner
    Lucido Solar AG
  • Photo
    Fent Solare Architektur
  • Awards and recognitions
    Norman Foster Solar Award 2012

  • Photovoltaic cost
    227,000 CHF (Roof); 67,000 CHF (Facades)

Lucido® is composed of a few elements according to
the principle of modular construction. This principle
allows the product to be adapted to all construction types.


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