Application of the hottest vacuum insulating glass

2022-08-15
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Application of vacuum insulating glass in the repair of ancient buildings

windows with a long history in cultural relics buildings are usually made of wood, steel profiles or cast iron and glass. When replacing or renovating, attention must be paid to the structural requirements and cultural relics protection requirements at the same time. Among them, appearance and structural design are the most important. This includes the size/division of the window, including the window core, the width of the window frame, the shape, material and structure of the window opening

windows with single-layer glass are often found in protected cultural relics buildings, but it is not suitable for buildings to be used in an energy-saving way. However, there is a great conflict of interest between the goal of cultural relics protection and the needs of contemporary users for energy efficiency, safety and comfort. By adding the second window layer to expand into double-layer windows or composite windows, embedding new glass windows or replacing them with new windows, energy improvements can be achieved. Of course, in order to reduce the thermal bridge, the connection between the window opening area and the building body must be optimized. For all measures on windows, the bearing capacity and size of window sashes and the bearing capacity of hardware are usually decisive factors. The room side of new windows, sashes and glasses must be airtight sealed, and the ventilation of the middle cavity to the outside must be reduced

the use of vacuum insulating glass (Vig) can improve the thermal insulation performance. However, so far, no supplier in the market can provide personalized design products with different window sizes and types. In the "mobile" research project, the Austrian Wood Research Institute explored the basic elements of vacuum glass window units, and studied the advantages and disadvantages of different structural changes. However, the durability of vacuum insulating glass products has not been systematically studied. The common point of all structures is that there is a very deep glass embedding depth of 30 to 40mm, which is necessary to compensate for the thermal bridge sealed at the edge of the glass. Using vacuum glass, a slender structure with good overall energy efficiency (minimum energy building standard) can be created, which allows the use of profiles of old wooden windows with single-layer glass. Compared with the three-layer insulating glass, it is lighter and the glass thickness is lower, which also provides a good opportunity for new opening types and moving directions. In order to develop suitable profiles, locking devices, hardware and sealant strips, as well as electric, we believe that further joint research is needed

since the heat and sound insulation characteristics are related to the maintenance of vacuum and the durability of the glass coating between two separate window glasses, its durability should be proved by ISO. Unlike MIG, the focus is on the load caused by length changes caused by heat and deformation, because Vig is very robust compared to "conventional" MIG. In ISO, unidirectional climatic loads superimposed by wind pressure and suction loads are not considered. In the test conducted by IFT Rosenheim, there was a large deflection, resulting in a large shear load at the edge seal. Therefore, based on the understanding of the impact when used in windows and curtain walls, IFT Rosenheim developed a detection method, which can prove the durability when actually used in windows and curtain walls

in the IFT test method, first determine the heat transfer coefficient UG of Vig in the panel equipment or hot box, and then install it in the sample curtain wall and expose it to climate and mechanical loads. After the load cycle, measure the UG value again and determine the deviation from the input value. In addition, the small vacuum insulating glass also has to withstand the combined action of moisture and ultraviolet light to detect the durability of the edge sealing system under the changing climatic load. Finally, the UG value is tested again so that the change of heat transfer coefficient can be evaluated

for practical use in windows and curtain walls, of course, other performance characteristics are required, such as sound insulation, sunshade, fire prevention and use safety. Xinxiang Chemical fiber is a chemical enterprise that produces and operates viscose fiber products. Colleagues and customers also brought samples of products to be tested in their factory. However, integrating Vig into the window frame or curtain wall structure requires structural adjustment of the previous window or curtain wall structure mainly used to change the performance of various materials, especially in order to reduce the formation of condensate in the glass edge area

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