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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

Historic building

renovation

listed building

© GruppoSTG
Building use: 
residential
IPV architectural system: 
opaque roof
IPV integration year: 
between 2021 and 2025
Source: 
BIPV meets History project

Historic building

Frazione Vignamaggiore 20, Montecrestese (VB), Italy

Introduction

Stakeholders

Design approach

Aesthetic integration

Energy integration

Technology integration

Decision making

Lessons learnt

Data

Producer and installer

Map

Author

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The valuable residential building, due to the passage of time and lack of maintenance, has come to the present day in conditions of advanced state of degradation from which resulted the conservative renovation project carried out in the two-year period 2021 to 2022. The building is under protection as it is within the perimeter of the ancient cores of specific historical and architectural interest. In the conservative intervention, technological systems have been included to meet the renewable hare of consumption. Specifically, among the renovation of the whole roof, the portion on the south and east slopes, not visible from the public road, has been covered with a a 6.5 kWp photovoltaic system made of photovoltaic module produced by GruppoSTG, while on the other pitches the traditional local stone covering was laid.

STAKEHOLDERS

Main building designer: 

Arch. Simone Giovanna

IPV system designer: 

GruppoSTG Srl

IPV components producer: 

GruppoSTG Srl

Product type: 
modules
mounting systems
energy systems
Address: 
Via P. Paleocapa 19, Bergamo (BG), Italy
Contact: 
+39 035-0510171
Web: 
https://www.gruppostg.com/it/
IPV system installer: 

GruppoSTG Srl

Address: 
Via P. Paleocapa 19, Bergamo (BG), Italy
Contact: 
+39 035-0510171
Web: 
https://www.gruppostg.com/it/
Works supervisor: 

Ing. Andrea Bonacci

In line with the Superintendence's prescription, the photovoltaic system has been camouflaged thanks to the use of 'dark' photovoltaic tiles, completed with passive ceramic elements shaped on site and dark in color. From the optical cones with which the south façade has been analyzed, the inserted technological system does not alter the perception of the south façade.

The single photovoltaic tile is a frameless sandwich consisting of a 4 mm sunlight-transparent front glass and a 4 mm 'black' rear glass whose coloring is obtained by virtue of the use of a vitrifiable paint applied just before the tempering process. The insertion of high-efficiency monocrystalline cells between the two glasses leads to the obtaining of an overall dark color of the element.

 

The energy produced by the photovoltaic system is used primarily to meet the building's electricity needs; Thanks to the presence of a storage system, about 70% of the building's needs are covered (heat pump for heating and cooling the building, heat pump water heaters for domestic hot water, all household appliances, home automation and lighting).

Moreover, thanks to the special assembly system, the wiring between elements is concealed in the space below, which acquires the connotation of a technical passage space as well as being functional for ventilation under the tile. In this space are located the power optimizers that in this project have been combined with photovoltaic tiles to improve their performance and for monitoring needs.

Operating in an environment subject to landscape protection, the aesthetic aspect has been crucial in order to preserve the morphological, chromatic and cultural character of the architectural heritage. We therefore opted for a technological solution that would lead to visual as well as spatial compatibility.

Since this is a BIPV system currently installed in other constrained contexts, no procedural problems were found; the high inclination of the pitches required the use of the smaller version of the photovoltaic tile that was better maneuverable at that altitude.

PROJECT DATA

Project type: 
renovation
Heritage constraint: 
listed building
Building construction technique: 
pre-industrial
Coverage of electric consumption [%]: 
70
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BIPV SYSTEM DATA
Architectural system: 
opaque roof
Integration year: 
2022
Active material: 
monocrystalline silicon
Module transparency: 
opaque
Module technology: 
glass-glass, hidden PV, standard modules
System power [kWp]: 
6.5
System area [m²]: 
37.5
Module dimensions [mm]: 
1,000 x 750 x 9
Modules orientation: 
South, East
Modules tilt [°]: 
38
Annual PV production [kWh]: 
7,950
BIPV SYSTEM COSTS
Total cost [€]: 
33,000
€/kWp: 
5,077
€/m²: 
880
IPV components producer: 

GruppoSTG Srl

Product type: 
modules
mounting systems
energy systems
Address: 
Via P. Paleocapa 19, Bergamo (BG), Italy
Contact: 
+39 035-0510171
Web: 
https://www.gruppostg.com/it/
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IPV system installer: 

GruppoSTG Srl

Address: 
Via P. Paleocapa 19, Bergamo (BG), Italy
Contact: 
+39 035-0510171
Web: 
https://www.gruppostg.com/it/
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Frazione Vignamaggiore 20, Montecrestese (VB), Italy
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GruppoSTG Srl