1. What is LOW-E glass?
LOW-E glass is low-e glass, which is coated on the surface of the glass. The emissivity E of the glass is reduced from 0.84 to less than 0.15.
2. What are the characteristics of LOW-E glass?
①High infrared reflectivity, which can directly reflect far-infrared heat radiation.
②The surface emissivity E is low, and the ability to absorb external energy is small, so that less heat energy is radiated again.
③The shading coefficient Sc has a wide range, and the amount of solar energy can be controlled according to the needs to meet the needs of different regions.
3. Why does the LOW-E film reflect heat?
The LOW-E film is plated with a silver layer. The silver can reflect more than 98% of the far-infrared heat radiation, thus directly reflecting the heat like a mirror reflecting light. The shading coefficient Sc of LOW-E can be from 0.2 to 0.7, so that the direct solar radiant energy entering the room can be regulated as needed.
4. What are the main mature coating glass processes?
There are two main types: online coating and vacuum magnetron sputtering coating (also called offline coating).
In-line coated glass is manufactured on a float glass production line. This type of glass has a single variety, poor heat reflectivity, and low manufacturing cost. Its only advantage is that it can be hot-bent.
The offline coated glass has a variety of varieties, excellent heat reflection performance, and obvious energy-saving characteristics. The disadvantage is that it cannot be hot-bent.
5. Can LOW-E glass be used as a single piece?
The LOW-E glass manufactured by the vacuum magnetron sputtering process cannot be used in a single piece, but can only be used in the synthesis of insulating glass or laminated glass. But its emissivity E is much lower than 0.15 and can be as low as 0.01 or less.
The LOW-E glass manufactured by the online coating process can be used as a single piece, but its emissivity E=0.28, strictly speaking, it cannot be called LOW-E glass (in science, objects with emissivity E≤0.15 are called low-emissivity object).
6. How does LOW-E glass work in summer and winter?
In winter, the indoor temperature is higher than the outdoor, and the far-infrared heat radiation mainly comes from indoors. The LOW-E glass can reflect it back indoors to keep the indoor heat from escaping. For part of the solar radiation from the outdoors, LOW-E glass can still allow it to enter the room. This part of the energy is absorbed by indoor objects and then converted into far-infrared heat radiation to be left indoors.
In summer, the outdoor temperature is higher than indoors, and 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 low shading coefficient can be selected to restrict its entry into the room, thereby reducing a certain cost (air-conditioning cost).
7. What is the effect of filling argon in LOW-E insulating glass?
Argon is an inert gas, and its heat transfer performance is worse than that of air. Therefore, filling the hollow glass can reduce the U value of the hollow glass and increase the heat insulation of the hollow glass. For LOW-E insulating glass, argon also has the function of protecting the LOW-E film.
8. How much ultraviolet light can LOW-E glass attenuate?
Compared with ordinary single-piece transparent glass, LOW-E glass can reduce ultraviolet rays by 25%. Compared with heat-reflective coated glass, LOW-E glass can reduce ultraviolet rays by 14%.
9. Which surface of the insulating glass is most suitable for the LOW-E film?
The hollow glass has 4 surfaces, and the numbers from the outdoor to the city are 1#, 2#, 3#, 4# surfaces. In areas where heating demand exceeds cold demand (in the north), the LOW-E film layer should be on the 3# surface. Conversely, in areas where the cooling demand exceeds the heating demand (southern area), the LOW-E film should be located on the 2nd surface.
10. How long can the LOW-E film last?
10. How long can the LOW-E film last?
The duration of the coating layer is the same as the duration of the sealing of the hollow glass space layer.
11. How to judge whether LOW-E film is plated on the hollow glass?
It can be monitored and judged according to the following steps:
A. Observe the four images displayed in the glass (in other words, there are 4 flames and 4 object images).
B. Put the match or bright object in front of the window (whether you are in the city or outdoors). If it is LOW-E glass, the color of one image is different from the other three images. If the colors of the 4 images are the same, it can be determined Low-E glass is not installed.
12. Do users need to do anything to maintain LOW-E glass products?
No need! Because the LOW-E film is sealed in the middle of insulating glass or laminated glass, it does not require maintenance, just keep the glass surface clean.
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