The Building

Building pre-intervention

Building pre-intervention: Villa Lavaux VD_Pre_1_(C)Google.png
Building pre-intervention: Villa Lavaux VD_Pre_2_(C)Google.png
Building pre-intervention: Villa Lavaux VD_Pre_3_(C)Google.png

Building post-intervention

Building post-intervention: Villa Lavaux VD_Post_1_(C)Freesuns.jpg
Building post-intervention: Villa Lavaux VD_Post_2_(C)Freesuns.jpg

Lakefront Villa in Lavaux

The villa is located in the beautiful UNESCO World Heritage protected Lavaux region in the Canton of Vaud, Switzerland. The owner's aim was to renovate the house with as close to a zero carbon footprint as technically possible. The challenge was to install a solar solution without disrupting the visual beauty of the roof and its surroundings. The construction permit for the solar roof was submitted to the Consultative Commission of Lavaux (CCL).

The Solution

Solution post-intervention

Solution post-intervention: Villa Lavaux VD_Post_3_(C)Freesuns.jpg
What is the Solution?

Solar tiles as an ideal replacement for traditional slate tiles. It is suitable for heritage buildings but also new construction where a matt finish is desired.

Why Does it work?

The solar tiles are perfect for this conservation environment, providing 100% full coverage without altering the visual aspect of the property located in this heritage protected region.

PROS
  • Adaptable to site requirements (colour, texture, shape)
  • Resemblance to tiles (mimetic).
  • Preservation of the appearance of the conservation area while producing energy in the new building.
CONS
  • Lower energy performance than standard modules.
  • Number of elements and "one-off" pieces.
  • More demanding to implement.
  • Much higher costs than a standard solution.
Type of installation
Replacement (building integrated - BIPV)
Part of the building
Roof only
Mounting system
information not available
Orientation
29° (S-W) 119° (N-W) -151° (N-E) -61° (S-E)
Slope
30°, 36°, 24°
Area (m²)
201
Availability
Yes, available on the market
Manufacturer
Freesuns
Model
Solaris Heritage
PV module format
Customized modules
PV module format max
Basic dimensions of the rectangular tile : 700 x 460 mm (700 x 175 mm)
PV module type
Glass-Glass
PV cells technology
c-silicon
PV module efficiency
13.82%
Total PV power
28.6 kW
Surface PV power (W/m²)
138.2 W/m2
PV energy production
abt. 25'700 kWh/yr
Weight
47 kg/m2
Dummy modules used?
Yes
Frame
No
Overlapping
Yes
Colorization
No (black modules)
Colorization technology
No colorization
Glass structure
Mat/Satin-finished

Before retrofit

After retrofit

Assessment

PV installation type
Replacement (building integrated - BIPV)
PV position
Roof only
Coloured PV
Yes
Module efficiency
10% < Efficiency <= 15%
Building alteration
Yes, the building envelope was modified in a non reversible way
Investment cost
Medium Low
Circular approach
No

Location

1095 Lutry VD, Switzerland - 379m
Climatic Zone:Cfb