BS2 Zeleganz receives Swiss Solar Prize 2019
Church of St. Francis in Ebmatingen: Only the interaction of all components of the BS2 Zeleganz energy system with its geothermal probe heat pump and seasonal regeneration of the geothermal storage tank, as well as LED lighting, ensures highly efficient, emission-free operation.
Roman Catholic Parish Egg
Architect:
Daniel Studer, Arch. ETH SIA, Villnachern
HVAC Planning:
W&P Engineering AG, Zurich
BS2 AG, Schlieren
Services/Products BS2:
Feasibility study
Subplanner SIA 3-5
Low-lift heat pump
Solar roof
Control
W&P Engineering AG, Zurich, and BS2 AG, Schlieren, and other participants were awarded the Swiss Solar Prize 2019. The high energy demand of the Roman Catholic Church of St. Francis in Ebmatingen, built in 1989, was met by an oil-fired heating system that consumed 7,000 liters annually and thereby emitted 21 tons of CO2 emitted. It was clear to the client that this was neither ecological nor economical.
Originally planned only as a heating renovation, a variant study for the heating replacement led to a surprising solution: The improvement of the thermal insulation of the tiled roof in need of renovation and the replacement of the window glasses in the old part of the building would be sufficient, in combination with an innovative heat generation, not only to operate the church emission-free, but also to act economically advantageous.
Church with solar roof
The commissioned architect Daniel Studer made a point of ensuring that the distinctive roof would continue to emphasize the building's delicate characteristics in its future role as an energy producer. The southwest side is fully equipped with photovoltaic-thermal modules (PVT) of the prefabricated BS2 solar roof, which was installed in one day, while a conventional PV system is installed on the northeast side. The two systems (PV + PVT) are visually uniform and generate a total of about 80 MWh of electricity and 40 MWh of heat per year.
This means that St. Francis Church has a self-energy supply of 221 percent. Of course, this is not solely due to the PV/PVT system. Only the optimally coordinated interaction of all components of the BS2 Zeleganz energy system with its geothermal probe heat pump and the seasonal regeneration of the geothermal storage tank, as well as LED lighting, ensures highly efficient, emission-free operation.
Through the use of new technology, it has been possible to combine demands for a sustainable building energy system with the desire for individual and uniform design. The jury of the Swiss Solar Prize 2019 also acknowledges this and writes: "The church renovation fulfills an exemplary function both in terms of energy and ecology. For this, the PEB church St. Franziskus Ebmatingen receives the PlusEnergieBau Solar Award 2019."
