Thermal Insulation Performance
As is well known, heat transfer occurs in three ways: conduction, convection, and radiation. The vacuum layer in the middle of the vacuum glass reduces the heat transfer by conduction and convection so low that it can be ignored. Therefore, vacuum glass has better thermal insulation performance than insulating glass. Generally, the heat transfer coefficient of single glass is 6W/M2·k, ordinary insulating glass is 3.4W/M2·k, and the heat transfer coefficient of vacuum glass can reach 0.5W/M2·k. After using vacuum glass, the air conditioner saves energy by 50%. Vacuum glass is the architectural glass with the best energy saving effect in the world.
Anti-condensation and frost resistance
Due to the high thermal insulation coefficient of vacuum glass, the temperature drop of the glass surface on the indoor side is small, so condensation and frost can be greatly prevented. Compared with the insulating glass under the same conditions, the dew condensation temperature of vacuum glass is much lower than that of insulating glass.
Sound insulation and noise reduction performance
Due to the unique structure of vacuum glass, it can effectively overcome the weakness of insulating glass that is easy to resonate in the middle and low frequency bands, and exert its good sound insulation effect. 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. 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. The weighted sound insulation of the vacuum glass reaches the national standard building exterior window air-borne sound insulation performance classification level 3 or above, and meets the requirements of the green building evaluation standard for exterior windows. The combined vacuum glass can reach grade 5 or above, fully meeting the special requirements of grade 5A office buildings, five-star hotels and hospitals.
Wind resistance
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 encounters negative wind pressure, and there is no problem that the thermal conductivity of the insulating glass increases when it is installed horizontally and at an inclination rate. Generally speaking, its wind pressure resistance is 1.5 times that of insulating glass supported by the same glass thickness.
Durability
The service life of vacuum flat glass depends on the following factors: one is the quality of the edge sealing; the other is the reliability of the sealing head; the third is the selection of the nonevaporable getter. Modern vacuum technology can fully guarantee vacuum glass to reach a vacuum life of more than 50 years. The high-quality low-e LOW-E films currently produced are all based on silver films, which are very afraid of being oxidized by moisture. This film is placed in vacuum glass to find the best "sanctuary", which can ensure its high efficiency and longevity.
Performance Comparison of Vacuum Glass & Insulating Glass
Insulating glass is an upgraded product of single-layer ordinary glass, and vacuum glass is an upgraded product of insulating glass. The appearance and structure of the two are basically the same, and they are both composed of two layers of glass. The difference is that the two layers of glass in the former are ordinary air or argon, and that in vacuum glass is a vacuum, which makes the big difference of their performance.
Comparison of Thermal Insulation Performance
Vacuum glass is a new generation of energy-saving architectural glass. Its thermal insulation performance is twice that of insulating glass and four times that of single-piece ordinary glass. The 12.4mm thick tempered vacuum glass may have three times the thermal insulation and heat resistance properties of the 32mm thick German triple insulating glass. And the U value of vacuum glass can be low to 0.4W/m2*K while that of insulating glass is 3.4W/m2*K.
Comparison of Anti-condensation Performance
Under the same humidity conditions, the condensation temperature of vacuum glass is lower, and the test shows vacuum glass may appear condensation only when the temperature is under -50℃. This is extremely beneficial for winter lighting in severe cold areas, and vacuum glass will not have the problem of "internal condensation" that often occurs with insulating glass. "Internal condensation" is caused by the condensation of moisture in the insulating glass at a lower temperature, which cannot be removed at all, seriously affecting vision and lighting. It can be seen that vacuum glass has high thermal resistance, and has better anti-condensation performance than insulating glass.
Comparison of Sound Insulation Performance
The below table shows that the sound insulation of ordinary insulating glass is only 20.8dB, and the sound insulation of vacuum glass can reach 38dB, which is nearly twice that of ordinary insulating glass; even in the daytime, doors and windows equipped with vacuum glass can also reduce The indoor noise is reduced to 29dB, and the outdoor environmental noise is reduced by more than 50%, which meets the requirement that the nighttime noise in the bedroom is less than 30dB stipulated in the new version of the General Code for the Building Environment.
|
No. |
Windows configuration |
Noise when window open (dB) |
Noise when window closed (dB) |
Sound insulation (dB) |
|
1 |
60 broken bridge aluminum window + insulating glass |
68.3 |
47.5 |
20.8 |
|
2 |
60 broken bridge aluminum window + vacuum glass |
65.4 |
29 |
36.4 |
Comparison of Wind Pressure Resistance
Half the thickness of the insulating glass, the wind pressure resistance of the vacuum glass has reached the highest level of the national standard; twice that of the insulating glass. Tempered vacuum glass is an ultra-thin material formed by connecting two pieces of tempered glass and titanium alloy under atmospheric pressure. It has high resistance to deformation under the action of external force. Our industrial tempered vacuum glass technology improves its wind pressure resistance and strength, far superior to ordinary vacuum glass and argon-filled tempered low-e insulating glass.
Comparison of Energy-saving Effects
Single vacuum saves 30% energy than coated insulating glass, and vacuum composite low-e saves 60% energy than insulating glass. In addition, vacuum glass is sealed with special materials, which can change the air intake problem of insulating glass due to the failure of sealant. This means considerable savings in energy bills every year.
Based on the above comparison and analysis, it is concluded that energy-saving sound insulation vacuum glass is the third generation of door and window glass respected internationally after single-layer glass and insulating glass, and it is one of the most effective energy-saving door and window materials at present. The use of vacuum layer insulation is the most material-saving, space-saving, and energy-efficient insulation method. In the future, the doors and windows, walls and even roofs of buildings can be turned into vacuum, allowing people to truly live in a "thermos flask".