A new, energy-efficient commercial and office high-rise in a unique glass, wood-hybrid construction was built on the site of the former goods station in the city of Tübingen.
The new seven-storey commercial building ‘Westspitze’ is the flagship in the new city quarter of the old freight yard because the energy efficiency building is completely clad with PV modules on the façade. More than 600 bronze-colored solar façade modules from AVANCIS generate electricity with an annual forecast yield of more than 50 MWh. Thus, almost 30 tons of CO2 emissions are saved through the use of solar power per year.
Design and performance of the modules were crucial
The new high-rise wood-hybrid building was realized by the architects ackermann + raff under the construction management of pro.b architects in Tübingen. Due to the special demands on the energy efficiency house, the decision for a four wall solar façade was made from the start. “In order to cover the primary energy demand with solar energy, we were not only looking for high-performance PV modules, our main focus was above all on the aesthetics and simple installation of the solar façade modules. Neither the cell structure, nor the fastening of the facade modules were allowed to be visible, as these determine the style and color of the entire envelope of the building”, says Andreas Stahl, managing director of pro.b GmbH & Co. KG.
Tübingen leads the way: building project with model character in terms of energy efficiency
Stadtwerke Tübingen (municipal utility of Tübingen) is the operator of the PV system from ‘Westspitze’ and approaches a clear path to the energy change. Until 2024, 75 percent of Tübingen’s electricity grid is to be covered by renewable electricity generation.
“There is a significant potential in photovoltaics to push the energy change with even more solar energy generated on and at buildings. New technical options, such as the façade PV system on the Westspitze, are not only interesting prestige projects, they can also make a real contribution to the city’s climate protection goals”, says Hanno Brühl, Head of Energy and Innovations at Stadtwerke Tübingen.
“We are of course very pleased that we were able to be part of this imposing and groundbreaking construction project and also makes us a little proud,” adds Dr. Lutz Tautenhahn, Head of Sales & Consulting at AVANCIS. “Following the requirements for the statutory energy efficiency criteria, we always try to provide the best possible solar building product to architects, property developers and investors. A well thought-out product design, aesthetics and seamless integration into the building envelope are decisive. Solar façades play an important role in the energy change. Unlike passive cladding, electricity-generating façade elements create an active contribution to energy demand and thus change sustainable the carbon footprint of buildings.”
AVANCIS GmbH develops and produces premium class solar modules based on the copper-indium-gallium-diselenide connection (CIGS modules) “Made in Germany”. This innovative technology is developed in the company’s own R&D centers in Munich and Torgau and implemented in the production facilities in Torgau. The AVANCIS technology goes back to the pioneering work in the 80s at Arco Solar and has developed into today’s thin-film technology through many intermediate stages. The main brands are the SKALA product platform as an energy-generating facade cladding material for buildings and infrastructure facilities as well as the PowerMax® photovoltaic module, which is used in open spaces and roof-top systems. AVANCIS has been part of the CNBM Group since 2014. www.avancis.de/en