[China Glass Net] Everyone must know that the hollow glass with Low-E is installed, and the thermal insulation performance has been greatly improved. In the years of China's building energy efficiency development, Low-E glass has also been endorsed by the community as a new technology. The benefits of it may not be known to you.
1. Features of Low-E glass:
1 Infrared reflectivity is high, which can directly reflect far-infrared heat radiation.
2 The surface emissivity E is low, and the ability to absorb external energy is small, so that less heat is radiated.
3 The sunshade coefficient Sc is wide, and the amount of solar energy can be controlled as needed to meet the needs of different regions.
2.Low-E film can reflect heat characteristics
The Low-E layer is plated with a silver layer that reflects more than 98% of the far-infrared heat radiation, reflecting the heat directly as reflected by the mirror. The LOW-E shading coefficient Sc can be from 0.2 to 0.7, so that the direct solar radiant energy entering the room can be adjusted as needed.
3.Low-E glass coating process
There are two main types: on-line coating, vacuum magnetron sputtering coating (also known as off-line coating). The in-line coated glass is manufactured on a float glass production line, which has a single variety, poor heat reflectivity, and low manufacturing cost. Its advantage is that it can be hot bent. The off-line coated glass has a variety of varieties, excellent heat reflection performance and obvious energy-saving characteristics. The disadvantage is that it cannot be bent.
4. Use characteristics of Low-E glass
The Low-E glass manufactured by the vacuum magnetron sputtering process cannot be used in a single piece, and can only be used for synthesizing insulating glass or laminated glass. However, its emissivity E is much lower than 0.15 and can be as low as 0.01 or less. Low-E glass manufactured by in-line coating process can be used in a single piece, but its emissivity is E=0.28. Strictly speaking, it cannot be called Low-E glass (scientifically, the object with emissivity E≤0.15 is called low radiation). object).
5. The principle of Low-E glass in summer and winter
In winter, the indoor temperature is higher than the outdoor, and the far-infrared heat radiation mainly comes from the indoor. The Low-E glass can reflect it back into the room to keep the heat in the room from diarrhea. For some solar radiation from the outside, Low-E glass can still allow it to enter the chamber, which is absorbed by the indoor object and then converted into far infrared heat radiation and left indoors.
In summer, the outdoor temperature is higher than indoors, and the far-infrared heat radiation mainly comes from outside the city. Low-E glass can reflect it out to prevent heat from entering the room. For outdoor solar radiation, Low-E glass with a low shading coefficient can be selected to restrict it from entering the room, thereby reducing the cost (air conditioning cost).
6. Argon in Low-E insulating glass
Argon gas is an inert gas, and its heat transfer property is inferior to that of air. Therefore, charging into the insulating glass can lower the U value of the insulating glass and increase the heat insulating property of the insulating glass. For LOW-E insulating glass, argon also acts to protect the Low-E film layer.
7. Low-E glass attenuation UV function
Low-E glass reduces UV light by 25% compared to conventional single-piece clear glass. Low-E glass reduces UV light by 14% compared to heat-reflective coated glass.
As a person in the energy-saving industry, we have always believed that Low-E is playing a large energy-saving function in the door and window glass. However, in a local specification issued in 2013, it said “No†to the Low-E setting.
The Jiangsu Provincial Department of Housing and Urban-Rural Development mentioned in the notice on the implementation of the "Technical Regulations for the Application of Standardized Exterior Window Systems for Residential Buildings": "Live-E glass and design bay windows are not recommended for residential buildings." Bay window is an unfavorable solution for energy loss. So how does Low-E become a technology that is not promoted? This has been plaguing the door and window energy-saving industry.
Before we can effectively explain it, we can continue to look at the technical regulations on standardized windows and doors in Jiangsu Province.
This standard is considered to be an earlier requirement for standardization of door and window processing in China. However, this standard has a clear suspicion of lowering Low-E efficacy.
The table above shows the configuration and corresponding heat transfer performance of several types of door and window glass listed in this standard in Jiangsu Province. The former solution is a low-E combination argon glass configuration, while the second and third are respectively a three-glass two-cavity without Low-E.
If the professionals in the glass industry can see the problem in this form at a glance. 5+6A+5+6A+5 This glass combination configuration is not reasonable at all (the cavity layer is too thin, the glass surface is too wide, and the two pieces of glass have the possibility of sticking together), and the energy-saving design in the north is basically not Introduced this configuration. What is even more strange is how the heat transfer performance of this triple glass is better than 6low-e+12Ar+6? Many test reports from the door and window units show that the performance of 6low-e+12Ar+6 is better than 5+6A+5+6A+5. Doesn't this standard clearly degrade the effectiveness of Low-E?
We are all in the industry engaged in building energy conservation, and deeply understand that while adopting building energy-saving technologies, we must also consider whether product technology is low-carbon, energy-saving and environmentally friendly. Low-E is an epoch-making innovation. It is unreasonable and unreasonable to increase energy consumption by building a piece of glass.
Therefore, we have expressed great doubts about this standard in Jiangsu Province! I don't know how you think about this ambiguity in the industry. Welcome to express high opinion, of course, do not have to use lighting or visible light transmittance. Ultra-white glass plus Low-E can also obtain reasonable shading coefficient and visible light transmittance.
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