Application of stainless steel spacers in insulating glass

[China Glass Net] The outer protective structure in the building is divided into two parts: light transmission and opacity. The light-transmitting part is mainly glass, which is mainly used for lighting, landscape and ventilation. Due to the application of glass, our building is more likely to reflect the designer's personality and different architectural styles; the masonry in the opaque outer protective part The use of reinforced concrete and other composite materials is essential for structural aspects of the building. Through the use of these two different elements, architects bring a rich life to our architecture. In contrast, people's requirements for building energy efficiency in buildings are only 10-20 years old. Although the building energy of the glass is not as good as the opaque outer protective structure, after the appropriate internal/external thermal insulation treatment, the energy saving effect brought by the thermal insulation can be greatly improved, and even the zero energy consumption of the whole building can be achieved. However, people did not use the outer opaque portion to completely replace the glass of the light-transmitting portion.

The energy-saving effect of insulating glass is much better than that of single-layer glass. Three factors affecting the thermal insulation effect of insulating glass In thermal radiation, thermal convection and heat conduction, thermal radiation is relatively large. Therefore, to improve the energy-saving effect of insulating glass, it is necessary to first grasp the main contradiction. If it cannot be carried out simultaneously in these three aspects, then first, low-emissivity glass must be used, and secondly, inert gas and warm-side spacers are considered. In addition, we use materials with different configurations of insulating glass, so that the effect of the replacement should be improved as a whole, and there should be no conflicts between the alternative materials and the effects cancel each other out. Third, when selecting an insulating glass material, consideration should be given to matching the service life of the insulating glass with the service life of the window. Fourth, it is also necessary to meet the product's cost performance, wide application range, and easy to promote.

What we mean by improvement is that the overall performance is improved based on the basic performance of the existing insulating glass. Rather than losing some of the necessary features to get some performance. At present, the application of warm edges mainly include extruded PVC spacers, silicone (or EPDM) spacers, stainless steel spacers (0.09, 0.13-0.15mm wall thickness), plastic steel composite spacers, U-shaped steel Spacer strips, composite strips, and heat-insulating spacers. Among them, some warm edges relative to the cold edge aluminum spacer strip can reduce the condensation phenomenon of the hollow glass edge, but at the cost of reducing the sealing life of the insulating glass; other warm edges because the metal thermal conductivity is not lower than other warm edges, However, the scope of application has great limitations, not only the poor cost performance, but also does not blend with the sealant. In addition, some applications of warm edges, so far, there is no convincing data to prove that it does not lead to the penetration of inert gases and the oxidation of low-radiation soft coatings.

The above considerations tell us that although many warm edges on the market can improve the improvement of insulating glass more or less, not all warm edges improve the overall performance of insulating glass. We believe that the attitude of choosing warm-walled spacers should be gradual, not jumping, and adopt a total negative attitude towards the existing ones. In this sense, the above spacers are examined. We have found that stainless steel spacers are the preferred choice so far, mainly because although stainless steel has a higher thermal conductivity than non-metals, it has much lower thermal conductivity than aluminum. And its linear thermal expansion coefficient is not only much lower than aluminum metal but also other non-metals, both in terms of thermal conductivity and linear thermal expansion coefficient, are closer to glass.

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