Summary and conclusions

In the paper the application demonstration and performance of a novel polymer film based TI structure was described. The TI facade system based on optimized cellulose triacetate polymer film TI structures yielded excellent performance properties. Although cellulose triacetate absorbs a high amount of water no adverse condensation phenomena within the TI facade were observeable. These findings are mainly related to the diffusion-open
construction of the TI facade based on timber profiles with minimized material fraction. During the investigated measuring period a successful operation and no adverse pollution of the TI facade were obtained.

Due to the promising results of the development and application demonstration project further activities are planned. In cooperation with the Arbeitsgemeinschaft ERNEUERBARE ENERGIE we intend to disseminate the developed TI structure by a do — it-yourself assembly-system to further 3 to 5 demonstration objects focussing also on building renovation. Furthermore, concepts for an industrial production of the novel TI structures will be elaborated together with partners from the polymer processing industry.

Acknowledgements

The authors wish to express their acknowledgements to the Fraunhofer Institute for Solar Energy Systems (Freiburg, Germany) for the cooperation in the course of this study, especially for making the modelling software and some of the laboratory equipment available for investigations.

Parts of the research work of this paper were performed within project S.14 at the Polymer Competence Center Leoben GmbH (PCCL, Austria) within framework of the Kplus-Program of the Austrian Ministry of Traffic, Innovation and Technology with the contributions by the University of Leoben, Graz University of Technology, Johannes Kepler University Linz, Joanneum Research ForschungsgesmbH and Upper Austrian Research GmbH. The PCCL is funded by the Austrian Governments of Styria and Upper Austria.

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