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Stainless steel spacer bar is the right choice of warm edge insulating glass
DATE:2016-6-22 HITS:179
As people gradually increase awareness of energy efficiency, especially in global energy prices in the rapid growth in the past year and intensified global warming, as well as China's first energy-saving up to "basic policy" in the revised Energy Law implemented since April 1, 2008, will lead to the implementation of various levels and energy-related policies, regulations, technologies, tools and measures. In terms of architectural glass, Low-E glass used in insulating glass in the past few years, has been significantly increased, an inert gas (mainly argon) use is also a little inkling. These reduce the heat radiation and heat convection means, will have wide application further. In contrast, most people on the warm side of the understanding, but also limited from the viewpoint of thermal conductivity is selected, not only very superficial, more importantly, the potential performance of the insulating glass seal life in particular, the is a potential risk. Low-E glass and argon gas with different types of warm edge more, and is different quality. Therefore, the performance evaluation of the warm side, not only the thermal conductivity, but also consider the other four requirements:
 
 1. reduce thermal bridges;
 
 2. Easy handling and processing;
 
 3. To ensure the quality of glass;
 
 4. To improve economic efficiency.
 Thermal insulating glass spacer bridge or said heat flux depends on the thickness and thermal conductivity of the spacer material. The thermal conductivity of aluminum is 171.6W / m · K, the thermal conductivity of stainless steel is 14.3W / m · K, 9% less than aluminum. Wall thickness aluminum spacer is generally used is 0.4mm, stainless steel spacer typically ≤0.2mm, a maximum of 50% aluminum spacer bar. Heat flux in the temperature difference (ΔT) and the spacing of the length (L) under the same conditions set aluminum spacer heat flux is 100, Table 1 shows the different thicknesses of aluminum and stainless steel spacer between the spacer ratio.
 Stainless steel spacer in both the thickness and thermal conductivity than aluminum spacer small, 0.2mm wall thickness and heat flux 0.15mm stainless steel spacer, and were 4.2% and 3.1% aluminum spacer bar.
 
 Under German windows and Technical College (D- Lucerne Anaheim) calculation results show that the use of stainless steel spacer Ψ linear heat transfer compared with aluminum spacer, a reduction of 25-45%.
 
 Also worth noting is that the benefits of using an additional spacer bring the stainless steel can significantly reduce the temperature of the condensate formed. Since the temperature increase of the surface area of the glass, the formation of condensation will decrease significantly.
 
 Insulating glass production
 
 Needless to say, the choice of warm edge spacer bars must be considered easy to hollow glass production, should be possible to apply existing process conditions. To this end, warm edge spacer bars should have a certain rigidity. Stainless steel spacer having excellent mechanical properties, made into a spacer frame, especially after the big box very easy to transport, and therefore more suitable for continuous production of hollow glass. Since the insulating glass spacer using stainless austenitic stainless steel, both in thermal performance and insulating glass production, are the best choice. When this type of spacer bar bending, can also be pre-filling molecular sieve afterwards irrigation, therefore, more convenient. Some warm edge spacer bars with different time intervals on a stainless steel box section, without heating, thereby shortening the production time and reduce production costs. In addition, the production of stainless steel spacer whether an acute or obtuse angle interval box is very convenient; In addition, the spacing of the cutting stainless steel, either using a diamond grinding wheel and can use special hacksaw sheet. Finally, trim and use of aluminum spacer used in the same.
 Quality of glass
 
 Aluminum spacer insulating glass production more than 40 years of history. Double sealed insulating glass seal life is to ensure that the necessary long-term, this has become a common understanding of the industry. The positive experience of decades of using a metal spacer double sealed accumulated can be completely transferred to a stainless steel spacer bars aspects. Compared with other warm edge spacer bars, stainless steel production of insulating glass spacer Another big advantage is that its testing, we do not need to use any other special means of detection, and direct use of currently available quality standards and testing methods . Metal spacer itself has water and inert gas impermeable characteristics throughout the life of the guarantee remains water vapor permeability. This is a warm edge or organic composite materials can not match the warm side. The adhesion results IG sealants and metals are particularly good coefficient of thermal expansion compared with other spacer material difference between the stainless steel and glass, it is the lowest. Thereby reducing stress sealant for insulating glass seal life assurance has a positive effect.
 At 80 ℃ condition, aluminum spacer with a length difference between glass 0.90mm, the length difference polypropylene spacer and the glass is 8.46mm, and the relative difference in length of stainless steel warm edge spacer is only 0.42mm, and closest to the glass. Hotline expansion coefficient difference is too large, it will cause the spacer and sealant peeling, dislocation, hollow glass seal failure, the release of metal-plastic composites spacer between the glass spacer has a hollow cavity shift.
 
 Worth emphasizing is that land is the linear expansion coefficient of the glass spacer closer to the more favorable hollow glass seal life extended. The reason is that the length of the spacer between the glass and the change in the difference between the lead sealant shear tear. If the shear deformation is greater than the extent of butyl rubber and plastic structure can absorb, sealants and bonding strength between the spacer will be affected, in the worst case, it will be insulating glass spacer the inner spacer projections. And organic materials such as polypropylene, stainless steel spacer, although the thermal conductivity of view, is a good warm side, but from the ensure the sealing performance of insulating glass, the effect be disastrous. From Table 2 can also be found, compared to polypropylene and stainless steel, under the same conditions, the relative increase in length is 16.08mm. Is difficult to envisage, two kinds of hot expansion coefficient is so large (the difference between them is 9.375 times) made spacer between the high temperature material can no peeling, no organic material can be within the insulating glass spacer layer projections?
 
 Be seen in the choice of warm edge insulating glass production, not only to consider the thermal conductivity of the material and, more importantly, must also consider the impact of hot expansion coefficient of insulating glass seal life material. After all, only in the use of hollow glass guarantee long seal life makes sense!
 
 In addition, it should also be noted that the hollow glass existing and being developed by spacers testing standards, is based on the metal spacer bars on the basis of technical parameters of the main considerations is not included in the interval of the ultraviolet resistance and moisture penetration rate. We believe that with the organic material of warm edge spacer bar to enter the Chinese market, ahead of our standard amenities, these manufacturers should provide this reliable test data and conditions.
 
 Visible, stainless steel spacer has so many advantages, so we believe that the insulating glass manufacturers use it as a warm-edge products and does not take any systemic risk.
 
 And economic and ecological efficiency
 
 2007 revised Energy Law implemented from April 1, 2008. "Energy is China's basic national policy" means the energy-saving long-term widely practiced in our country, long way to go. Construction Market Needs More good price-performance products continue to come out and use. Stainless steel spacer application time nearly 20 years, a long time, though not enough, but it is obvious what is to enhance the development direction of the hollow glass properties.
 
 Without denying the fact that the cost of stainless steel compared to aluminum spacer spacer bars are higher, however, additional investment stainless steel spacer areas, and the overall cost of the building to more than, less than one-thousandth, is negligible, but the windows performance and life improvement is huge. In addition, high-performance windows also bring improved comfort, reducing heating and cooling energy consumption of air conditioning. America's largest manufacturer Cardinal IG Company, the production of insulating glass is about 25 million, all stainless steel spacer production, shelf life of 25-year commitment. If we make the life of insulating glass have reached such an extent that, from a macro perspective, the country can save a lot of resources and energy, help protect the environment. According to foreign studies have shown that the use of stainless steel spacer made of insulating glass unit to reduce residential CO2 emissions is about 100M3. In addition, from the microscopic point of view of personal investment, although it is difficult to accurately predict the use of stainless steel spacer additional investment payback period is much, but at least one thing is certain, the global rise in energy prices must ultimately affect the price level of domestic energy Once with international standards, the additional cost of the stainless steel spacer payback period will be shorter, the greater the rate of return.