The difference between vacuum glass and insulating glass

Vacuum glass is a general term for a series of products with different characteristics. The most representative standard tempered vacuum glass in this series is compared with the widely used hollow glass. The main performances of the two products are as follows:

1. Sound insulation performance: In most frequency bands, especially in the middle and low frequency bands, the sound insulation performance of vacuum glass is better than that of insulating glass, and the overall sound insulation level is higher than that of insulating glass. At present, the sound insulation performance of the sound-insulating vacuum glass developed by Xinliji has reached more than 42dB. Generally, the human ear is sensitive to sounds having an absolute frequency of 1000 Hz to 5000 Hz, and vacuum glass is effective in this range. The noise difference is 5dB, and the hearing of the human ear is 3 to 4 times different.

2. Thermal insulation performance: The heat transfer coefficient of vacuum glass is doubled compared with that of insulating glass, the thermal insulation performance is obviously better than that of insulating glass, and the thickness is also reduced by multiple. At present, the heat transfer coefficient of energy-saving walls in severe cold and cold regions is required to be 0.4-0.6W/(m2?K), and the glass windows should be close to the standard of the wall. Ordinary insulating glass can no longer meet the energy-saving requirements of buildings in severe cold and cold regions in China. Low-E insulating glass can not reach the index of heat transfer coefficient less than 1, only vacuum glass can meet the requirements of all energy-saving standards in all regions of China.

3. Super composite performance: It is particularly worth emphasizing that if vacuum glass is combined with glass deep processing products such as insulating glass, coated glass, laminated glass, fireproof glass, foil glass and tempered glass, which are now mature, “Super Glass”, a variety of glass doors and windows with different special physical properties and good comprehensive performance will appear in various applications. Comparing the sandwiched semi-tempered insulating glass at the new CCTV site with the sandwiched semi-tempered vacuum glass, the advantages of the latter can be seen in detail. Under various conditions of similar performance, the use of vacuum glass can reduce the K value by several times and the thickness by more than one time. Reduce weight by a third. Not only is energy saving, but the building foundation and consumables for steel and aluminum alloy construction will be greatly reduced.

4. Anti-condensation and frosting performance: Since there is no gas inside the vacuum glass, there will be no “inner condensation and fogging”, and the vacuum glass has high thermal resistance, and its anti-condensation performance is also improved. Compared to insulating glass, vacuum glass dews when the outdoor temperature is lower.

Conditions: room temperature 20 ° C, indoor natural convection, outdoor wind speed 3.5m / s. One side of the vacuum glass is low-emissivity glass.

5. Vacuum glass also has the following advantages: since the spacer layer is a full glass material sealed vacuum layer, and a long-acting getter is added, there is no heating element that must be installed in an electric vacuum device such as a picture tube and a bulb, so the modern vacuum The technology can guarantee the vacuum life of vacuum glass for more than 20 years; the high-quality low-emission LOW-E film currently produced is based on silver film, which is very afraid of moisture oxidation. The film is placed in vacuum glass. The best "shelter" has been found to ensure its high efficiency and longevity; since the vacuum glass itself is a negative pressure device, there is no problem of bursting when it is transported to the plateau low pressure area or when it encounters negative wind pressure, and there is no horizontal or inclined The problem that the thermal conductivity of the insulating glass becomes large at the time of installation becomes large.