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O. Proskurnina, U. Pont, M. Schuss, C. Sustr, E. Heiduk, P. Schober, A. Mahdavi:
"High-tech solutions for building retrofit: investigation of window systems with vacuum glazing";
Applied Mechanics and Materials (eingeladen), Special Volume: Energy Saving and Environmentally Friendly Technologies - Concepts of Sustainable Buildings (2016), 824; S. 437 - 444.

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The retrofit of the historical building stock has gained significance due to energy
efficiency requirements in the building sector. Major attention is drawn to windows as they are
typically the building components with the highest heat transfer coefficient of the building
envelope. Therefore, vacuum glazing is a potential option for improving the thermal performance of
casement windows. In this context, specific considerations regarding building physics and heritage
protection regulations are required.
The present contribution describes the current progress of the research project VIG-SYS-RENO.
New double glazing products with durable vacuum layer are emerging on the market. Such
developments can be regarded as a major step toward energy-efficient windows with U-values close
to conventional opaque building elements. Small thickness and excellent thermal resistance of
vacuum insulation glazing renders it an attractive option in thermal retrofit of historical buildings.
Vacuum glazing systems could potentially offer a feasible balance between conservation and
thermal performance of windows. However, prior to any application, a set of aspects and potential
issues have to be assessed and explored. These include: (i) thermal bridging effects in different joint
positions, for instance the glass edge seal and the frame & wall joint; (ii) the positioning of tight
layers in composite or casement windows; (iii) aspects of structural integrity of windows equipped
with vacuum glazing. The present contribution structures the different aspects that need to be
considered in utilization of vacuum glazing in thermal retrofit, describes applied evaluation
methods, first results of the ongoing research project, and illustrates the influence of various rebate
depth and length of the edge seal on thermal transmission of the window.

retrofit, thermal performance, vacuum glazing, glass edge sealing, thermal bridges, structural integrity.