[China Glass Network] With the standardization of building management standards and the technological level of the glass industry, energy-saving glass, safety glass and environmentally friendly glass will play an increasingly important role.
Low-emissivity glass and multi-purpose coated glass, also known as insulating glass, have a large solar transmittance and a small reflection coefficient. 80% of the visible light can be absorbed into the room and absorbed by the object, and more than 90% of the long-waves radiated by the indoor object can be kept indoors, which greatly improves the energy utilization rate. At the same time, it can selectively transfer the amount of solar energy, and transfer most of the heat radiation energy into the room, which can play the role of heat preservation and energy saving in the heating building.
There is also a coated glass that can prevent solar radiation and outdoor heat radiation in summer. In winter, it mainly acts to block indoor heat radiation. On the basis of low-radiation glass performance, it also takes into account the performance of heat-reflecting glass, while retaining the original low-radiation film. Under the premise of the layer, by changing the thickness of other film layers, the transmittance of sunlight, especially near-infrared rays, is appropriately reduced, and the reflection and absorption of sunlight are improved, and the emissivity is low and the shading coefficient is small.
The above energy-saving glass has its own thermal advantages, and each has its own shortcomings.
If the building is oriented at the lower level of the building or where the sunlight is not radiated, the heat-absorbing glass is used. Not only the heat insulation effect is not obvious, but the indoor light is affected, and the lighting cost is increased. In the warm winter and hot summer areas, the low-radiation glass and the multifunctional function are selected. Coated glass will cause the indoor temperature to rise, resulting in an increase in air conditioning costs. At the same time, although the coated glass has a certain energy-saving effect, it exists in the form of insulating glass.
The combination of endothermic or counter-radiating glass with low-emissivity glass into a hollow glass is a preferred match. The solar radiation is absorbed by the heat absorbing glass and becomes heat energy. The radiation is converted into long wave radiation, and the long wave radiation is reflected by the low radiant glass and cannot enter the room.
In 2003, the National Development and Reform Commission, the Ministry of Construction, the General Administration of Quality Supervision, Inspection and Quarantine, and the State Administration for Industry and Commerce jointly issued a notice on the “Regulations on the Administration of Building Safety Glassâ€. It is clearly stated that safety glass must be used for 11 parts of the building that require glass as the building material. These include the outer opening windows of 7-story and 7-story buildings, and the window glass or glass bottom with an area larger than 1.5 square meters and floor-to-ceiling windows with a finishing surface of less than 500mm.
Safety glass mainly refers to tempered glass, laminated glass and other glass products processed by tempered glass or laminated glass, such as safety insulating glass. Single-piece semi-tempered glass and single-piece medium-sized glass are not in the category of safety glass.
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