Kindergarten and apartments - Chur - Roof only - Efficiency: 15%–15.3%

The Building

Building pre-intervention

Building post-intervention

Building post-intervention: kindergarten-calandastrasse-005_3.jpg

Kindergarten and apartments - Chur

The complex is divided into two structures. The residential building is characterized by the building height and the facade design as the main volume of the ensemble. The previous commercial building is deeper and due to its L-shaped geometry, forms an inner courtyard which, with its round arches and the widely projecting roof, has a high spatial quality. The specifications of the city of Chur as client were clear. The artistically valuable ensemble was to be preserved in its original expression. The earlier interventions should be dismantled, the change of use of the annex should be visible from the outside as a renewal but should be connected with the original design. And in addition: "Since Chur has been an energy town since 2011, it was necessary to incorporate the latest findings in energy and building physics into the renovation.”

More Details

The Solution

What is the Solution?

With the energetic renovation and an innovative heat network concept with the adjoining apartment building (MFH) with three families, the city of Chur is paving the way for the energy transition. There is a combined PV and thermal system on the roof. It covers its own energy requirements with 28,300 kWh/year to 95%. The solar excess heat of around 9,100 kW /year, which cannot be used in the transition period and in summer, is delivered to the neighbouring MFH. In the winter months, the pellet heating of the neighbouring MFH supplies the kindergartens and penthouses with 8,800 kWh of heat.

Why Does it work?

The photovoltaic system on the south and west roof produces approximately 8,800 kWh of electrical energy per year. This corresponds approximately to the electrical energy consumption of 2.5 households. The electrical energy is used directly by the residents (self-consumption). If the consumption is higher than the PV production, the additional energy is obtained from the IBC, if the PV production is higher than the consumption of the residents, the excess is fed into the IBC network.

PROS

The PV system complies with many of the geometric and spatial and construction compatibility criteria required by current regulations for the integration of solar systems in historic buildings (grouping, coplanarity with the water table, respect for the eaves lines, joint precision, etc.).

CONS

The aesthetic, material and colour compatibility with the existing roof is not optimal, but the final result is good and well-integrated with other new elements incorporated in the renovation of the building such as the formers.

Type of installation

Replacement (building integrated - BIPV)

Part of the building

Roof only

Mounting system

aluminium brackets

Orientation

252

Slope

Area (m²)

Availability

Yes, available on the market