Materials that affect double glazed units energy efficiency and lifetime
insulated glass must meet two basic requirements namely energy efficient, durability and sealing life. If an double glazed units has a poor energy efficient effect, even if the durability and sealing life are long, it is a low-grade double glazed units. Conversely, if the insulated performance of the insulated glass is good, but the durability and sealing life are short, it is not what people are pursuing. Obviously, the ideal insulated glass should have the best energy efficient effect and the longest sealing durability,glass sealant, 3A molecular sieve, thermal conductivity,
The main factors affecting the energy efficient performance of double glazed units are glass, aluminium spacers (frames) and gases. There are clear float glass or low-emissivity glass; the spacers have cold edges (aluminum spacers) or warm edge spacer; and the gas has air or an inert gas such as argon. The insulated glass with clear float glass, air and aluminium spacer has the worst energy efficient effect under fixed conditions, while the low-emissivity glass, argon filled double glazed units with warm edge spacer and filled argon glass have the best energy efficient effect.
The main factors affecting the durability and sealing life of the double glazed units are glass sealant, sealing structure, spacer, desiccant (molecular sieve) etc. It has been proven that the insulated glass using the double sealant, the continuous spacer strip and the 3A molecular sieve has the longest sealing life, while the insulating life of the insulated glass using the single-pass seal, the four-sided gusset aluminum spacer and the 4A molecular sieve is short. The 20-year tracking of the actual use of insulated glass by the North American insulated Glass Association confirms this. In addition, the results of the accelerated glass aging test (PI test) show that the expected sealing life of the insulated glass with different spacer sealing structures is huge, ranging from only 2 months to as long as 100 years or more.
Under the same conditions, the use of different spacers directly affects the energy efficient performance and durable sealing of the double glazed units. However, for a long period of time, aluminum spacers (mainly four-sided gussets) are commonly used to make insulated glass. Although the sealing life is long, the thermal conductivity is high, resulting in poor energy efficient effect, which is directly present on the edge of the insulated glass. In the late 1970s, the composite strips had the characteristics of low thermal conductivity, which was improved compared with the use of aluminum spacers to make insulated glass, but unfortunately reduced the sealing life.
This misfortune is also manifested in the fact that in the traditional thinking framework, no matter how hard and improved, the energy efficient effect of double glazed units and the durability of sealing life can not be achieved. In the late 1980s, two Canadian scientists who had the courage to forge ahead challenged the first time to solve the contradictory method of solving the energy-saving and durability of insulated glass, namely the super spacer, which caused a revolution in the field of insulated glass. The super spacer strip is a continuous spacer strip of silicone microporous structure material containing no metal and containing 3A molecular sieves. Its characteristic is that the thermal conductivity is the smallest, which can greatly increase the temperature of the peripheral edge of the insulated glass, and achieve 40% of the energy-saving effect of the low e glass, and greatly reduce the condensation degree of the periphery of the glass. The use of super spacer for the production of double glazed units uses a reverse double-pass sealing method, which gives the double glazed units excellent durability and sealing life for more than 100 years. According to the case of double glazed units made of super spacer strips in North America, the double glazed units made of super spacer not only has good energy efficient performance, but also minimizes the problem of after-sales service (complaint) due to its excellent durability and sealing life. . In North America, manufacturers give end 20 years warranty for super spacer insulated glass while other manufacturers offer only 5 to 15 years for normal insulated glass, Currently, in many spacer systems, the super spacer strip is the only spacer that enables the insulated glass to maintain optimum energy conservation for a long period of time during use.
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