FLUIDGLASS - Solar Thermal Facades with Adjustable Transparency

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Type and Duration

EU 7.RP-Förderprojekt, September 2013 until August 2017 (finished)


Institute of Architecture and Planning

Main Research

Sustainable Planning and Construction

Field of Research

Sustainable Design


The FLUIDGLASS project develops a new and innovative concept for multifunctional solar thermal glass facades systems. The FLUIDGLASS approach turns passive glass facades into active transparent solar collectors while at the same time controlling the energy flow through the building envelope. FLUIDGLASS unites four key functionalities in one integrated system: The system firstly acts as a fully transparent solar thermal collector, which enables harvesting of solar energy even in buildings with large glass share. It secondly acts as transparent insulation layer and thirdly controls the solar radiation transmission and inner glass surface temperature thus increasing the thermal user comfort and reducing the demand for heating, cooling and lighting. At the same time FLUIDGLASS substitutes conventional HVAC components such as cooling and heating panels.

Replacing four different systems by one, FLUIDGLASS brings a significant cost advantage compared to existing solutions. FLUIDGLASS increases the thermal performance of the whole building resulting in energy savings potential of 50%-70% for retrofitting and 20%-30% for new low energy buildings while the comfort for the user is significantly improved at the same time. Compared to state-of-the-art solar collectors FLUIDGLASS has the elegant but neutral aesthetics of clear glass. This allows full design freedom for the architect in new built applications and enables retrofits that do not destroy the original look of an existing building.

Practical Application

The FLUIDGLASS system will be validated in different climate conditions. The consortium brings together partners experienced in glass architecture, building simulation and energy management but also in experimental testing, HVAC systems, manufacturing of glazing units and construction of facades. It is very well balanced between RTD and industrial sectors covering the whole innovation value chain of the future building skin and gives an important role to participating SMEs.

Reference to Liechtenstein

Im Rahmen des FLUIDGLASS Projekts wird ein neues und innovatives Konzept für multifunktionale solarthermische Glasfassadensysteme entwickelt. Es wird mit elf Partnern aus der Wissenschaft und der Wirtschaft betreut, u.a. in der Zusammenarbeit mit Hoval in Liechtenstein, Mayer Glastechnik in Feldkirch und NTB in Buchs. Durch dieses Projekt wird die Reputation Liechtensteins als Forschungsstandort für neue Technologien im Bauwesen gefördert.


Energy saving (Measures for), Energy storage, Energy transport



  • Baumgärtner, L. (2017). Evaluation of a Solar Thermal Glass Façade with Adjustable Transparency in Cold and Hot Climates. Paper presented at the CISBAT 2017, Lausanne, Schweiz.