Load analysis for the development of a bonded edge seal for fluid-filled insulating glazing

Aesthetic and energy efficiency considerations play a decisive role in facade construction. In recent years, the use of fluids in pane cavities has been the subject of increased study, the aim being to satisfy the requirements of energy saving legislation. Such fluids are useful for transforming facades into multifunctional building envelopes. The combination of hydrostatic pressure and constant fluid contact places the edge seal of such glazing under considerable loads. For this reason, initial pilot projects could only be realised using mechanical clamping aids. However, this goes against the aesthetic requirements of modern glass facades, which strive to achieve a maximum proportion of glass while keeping the proportions of the frame to a minimum. The goal, therefore, is to develop a bonded edge seal for use in fluid-filled insulation glazing. This paper presents an overview of the state of the art regarding adhesive and sealing compounds in a fluid medium and fluid-filled facade elements. Followed by a potential edge seal design and the implementation of a load analysis. Adhesives used in an edge seal are exposed to physical, mechanical and chemical loads. This often leads to degradation processes in the polymers. This paper describes the impacts and classifies them according to the type of the ageing effect. All impacts are summarised in a load analysis. A load analysis forms the basis of both a list of requirements and a suitable test program.