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Discussion on Low - E Glass

Published time:2017/10/26 10:11:24,Publisher Huizhou Xingguangyu Intelligent Technology Co., Lt


In the contemporary city, with the high density of population, the emergence of three-dimensional traffic, more and more high-rise buildings in front of people. Due to the increasing demands on the decorative requirements of buildings, the use of building facades in glass curtain walls has been increasing, and the use of such building materials has been increasing. People in the choice of building glass, not only pay attention to its artistic aesthetic features, but also to consider its thermal insulation, energy costs, light pollution problems and the sun's comfort and balance and other issues. As a result, new glass materials have emerged, with excellent insulation and good light transmission of new materials - Low-E glass is one of them, it is more and more by the architectural designers, developers and even the use of the crowd's attention The This article makes a brief discussion of this material.

First, Low-E glass performance Low-E glass, which is a low-emissivity glass, is a film product coated with a multilayer metal or other compound on the glass surface. In 1978, this material was first applied by the United Kingdom to the building. By 1985, one of the world's glass industry giants, the United Kingdom Pilkington company to achieve the Low-E glass of large-scale production, from 1990 onwards, its consumption in the United States at an annual rate of 5% increase. Compared with ordinary glass materials, Low-E glass has excellent thermal and optical properties. By coating a metal film on the surface of a transparent glass plate, such as a silver-based low-radiation film, it can greatly reduce the heat loss caused by indoor radiation to the outside, thus ensuring a comfortable indoor balance. heating

While the consumption of fuel, but also slow down the carbon dioxide emissions caused by the greenhouse effect. In addition, Low-E glass in the visible range has the same good transmittance as ordinary glass. The shortwave in the sun passes through the glass and shines into the interior  On the body. After these objects are heated, they will be re-irradiated in the form of long waves. These long waves of radiation are blocked by Low-E glass, which returns to the room and also achieves the purpose of reducing indoor heat loss. Regardless of the indoor and outdoor temperature difference, the use of this low-radiation glass, will be able to achieve "Dongnuanxialiang" ideal state. However, unlike ordinary glass, the low-E glass has a low reflectivity, which ensures that the interior space of the building is well lit and does not adversely affect light pollution caused by light reflection. Further reducing the probability of traffic accidents.

Second, Low-E glass improvement  The development of science and technology has also made the performance of Low-E glass further improved. In order to solve the problem of low-E glass due to the fragility of its coating layer, the glass is protected by forming the glass in a hollow form. The emergence of insulating glass, but also let people see the low-E glass development prospects. In order to improve the thermal insulation properties of glass, people try to increase the thickness of the glass twice to the original, but from the experimental results found that the thermal emissivity and single glass is almost the same. And the insulating glass was kept at a constant pitch between the 3 mm thick glass plate and the Low-E glass to form a vacuum layer having a thickness of only about 0.2 mm. With this vacuum layer, the thermal emissivity can reach half of the high insulation glass. To further enhance its thermal insulation properties, even with the same conditions can be produced under the three-layer glass. The Great is right in his "building and the environment symbiotic 25 points," a book has been proposed in the double-layer insulating glass between the idea of plus blinds. Like the common blinds in life, it can not only resist ultraviolet radiation in the shade, but also through the blinds up and down the angle of change, which is very easy to adjust the sunshine and lighting. Put down the leaves of the blinds down to form a whole piece, the air layer is divided into two parts. According to the data provided in the book, it is known that the "louver" glass has a thermal emissivity of 2.0 W / (m2 · K), which is equivalent to the high insulation double layer of the hollow layer of 12 mm. This window with a blinds can even replace the ordinary cloth curtains, to ensure the privacy of the interior space.  I have suggested in the construction equipment courses on the Low-E glass may be the initial improvement: the insulating glass blinds replaced with renewable materials. Daytime, sunlight, glass, heat storage material can be part of the heat absorption and storage, thereby reducing the heat into the room; and by the night, when the outdoor temperature gradually decreased, the regenerator through the form of heat dissipation provided to the indoor heat to achieve Hot comfortable state. This is similar to the working principle of the wall in the building. Its advantage is not only through the material itself can be adjusted within a day of indoor temperature, but also with the transformation of the season, with the principle of the work with the blinds to achieve a year of indoor thermal comfort balance.

Third, Low-E applications Built in 1997, Nanjing South Bank Building, the first use of the United States Viracon company's Low-E glass, its elegant blue-gray glass curtain wall at the time caused no small sensation, and energy efficiency is also very prominent. Although the Low-E glass can be described as a true sense of the green, energy saving, environmentally friendly materials, but not in real life is widely used. One reason is that the cost of Low-E glass is higher than that of ordinary glass, especially the technology of double silver Low-E glass; the second reason is that low-end low-E glass flooding the market, hinder Low-E Glass health development; the third reason is that Low-E glass is not known to the vast majority of people, so no one talk about its promotion. Emerging energy-saving materials will bring social and economic benefits, while improving the comfort of people's lives, but often because the material itself is not understood by architects, they can not talk about in the design to be used, let alone recommend To the customer.

Indeed, the current domestic use of Low-E glass is not optimistic about the status quo, but with the country have promulgated the public building and residential building energy efficiency standards, people have begun to pay attention and accept Low-E glass in life plays an important role, But also like Shanghai's Tomson Yipin, Beijing's Park Avenue and other high-rise buildings have been used to it. Coupled with the further development of technology, Low-E glass production costs have been reduced, and promote the developers of its investment. Finally, I believe that vigorously build the domestic corporate brand image, to enhance the quality of production is particularly important, is strictly prohibited low-E glass into the market, improve the visibility of domestic enterprises, and thus well-known brands to form a certain foreign competitiveness.

Fourth, the conclusion  In the global energy shortage, the whole society energy-saving awareness of the growing environment, accompanied by a shortage of land resources, more and more high-rise buildings from the status quo, Low-E glass has unlimited room for development and application prospects. The emergence of Low-E glass, improve the drawbacks of the traditional glass curtain wall, will gradually replace the traditional glass, leading people into the green, sustainable development of new living environment.