FFF-TaliSys - Freeform Systems for Daylighting to be Integrated in a Façade and in a Skylight

In the course of the project FFF-TaliSys novel daylighting systems based on freeform surface technology are developed and implemented into functional models, thus, innovative systems that solve the contradictory requirements of daylighting systems. The aim is to develop systems for façades and skylights that yield optimal visual and thermal functionality, but work without moveable parts and complex controls.). For the integration into the building skin as well as the optimization of the optical systems both thermal and visual boundary conditions are taken into account. Thereby, energy-efficient solutions shall result, which guarantee highest visual and thermal comfort in new and retrofitted buildings.

Short Description




Starting point / motivation

Modern building skins define the interface between indoor and outdoor climates and provide possibilities for efficient daylight utilization. Conventional exterior or interior shading systems (roller blinds, venetian blinds, etc) provide sun shading, but do not allow for proper room illumination by daylight. Only a few daylight redirecting systems are currently available, but they could not really prevail on the market. This issue is addressed by the system concepts of the project FFF-TaliSys.

Contents and goals

In the course of this project novel freeform surface components for practical and wide-spread integration into facades and skylights are designed. While becoming more and more state of the art in LED lighting, this technology is not yet used for applications in daylighting. The algorithms and software tools for freeform surfaces developed at Bartenbach will be used to develop intelligent, optical systems for daylight utilization. They shall provide solutions or at least compromises that account for the manifold and partly contradictory requirements:

  • adequate daylighting and distribution in the room
  • prevention of any glare
  • sun shading in summer (protection from overheating) and utilization of solar gains in winter
  • proper view to the outside (mainly for façades)
  • functionality for changing exterior conditions (sun position, sky cover)


The development and optimization of the daylighting systems will be based on defined visual and thermal variables. This shall lead to concepts that fulfill both, energy efficiency as well as complex visual and thermal requirements. The systems will be designed following a "low-tech" approach without moveable parts and complex controls, but still providing full functionality through high-tech optics. The elaboration of thermal and visual specifications for the set-up of transparent elements (façade or skylight), including daylight redirecting systems, later ensures the application in real buildings.

Expected results

Summarized, the following results are envisaged:

  • market and patent search about existing daylighting systems and patented concepts
  • elaboration of a specification document for the thermal design and the façade set-up for applying daylight redirecting systems
  • investigation of 2 concepts for façade- and 2 concepts for skylight systems using freeform surface technology
  • two functional models (one for skylights, one for façades) and visual, thermal and perceptional-psychological evaluations

Project Partners

Project management

Bartenbach GmbH

Project or cooperation partners

  • HELLA Group / HELLA Sonnen- und Wetterschutztechnik GmbH
  • University of Innsbruck, Institute for Construction and Materials Science, Division Energy Efficient Buildings

Contact Address

Mag. Wilfried Pohl
Rinner Straße 14
A-6071 Aldrans
Tel.: +43 (0) 512-3338-66
Fax: +43-(0) 512-3338-88
E-mail: wilfried.pohl@bartenbach.com
Web: www.bartenbach.com