Abstract
As part of an international research project—funded by the European Union—capillary glasses for facades are being developed exploiting storage energy by means of fluids flowing through the capillaries. To meet highest visual demands, acrylate adhesives and EVA films are tested as possible bonding materials for the glass setup. Especially non-destructive methods (visual analysis, analysis of birefringent properties and computed tomographic data) are applied to evaluate failure patterns as well as the long-term behavior considering climatic influences. The experimental investigations are presented after different loading periods, providing information of failure developments. In addition, detailed information and scientific findings on the application of computed tomographic analyses are presented.
Highlights
In order to meet European climate regulations [1], large facades are to be actively involved in the energy supply of buildings
Two channels, which are arranged at the top and bottom of the pane and which are connected to the building technology system (Figure 1(c)), distribute the fluid to and collect it from the capillaries
The functional capillary unit consists of a glass pane with capillary structure made of soda lime silicate glass and of a 0.75 mm thin glass made of modified and chemically prestressed aluminosilicate glass
Summary
In order to meet European climate regulations [1], large facades are to be actively involved in the energy supply of buildings. Two channels, which are arranged at the top and bottom of the pane and which are connected to the building technology system (Figure 1(c)), distribute the fluid to and collect it from the capillaries. The capillary unit can for example be used as a direct heating or cooling device in this context It can be applied in partition walls of offices or public buildings to contribute to a comfortable room climate. The bonding between capillary and cover glass has to satisfy high demands in terms of strength, transparency and durability (Table 1). Two different types of bonding materials are chosen for testing, namely acrylate adhesives and EVA films. As suitable material for glass lamination [4], it is chosen for reasons of strength and high transparency, whereas the material behavior for artificial aging is to be analyzed
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