- November 27, 2021
- Glass and Mirror Products Info
Eliterglass China Manufacture Vacuum Windows Insulated Glazing Glass
Let me talk about our most common insulating glass.
It is a product made of two or more pieces of glass, to effectively support and evenly separate and adhere to and seal the periphery, so that a dry gas space is formed between the glass layers.
Vacuum glass is a glass product in which two or more sheets of flat glass are separated by a support, and the periphery is sealed to form a vacuum layer between the glass.
Difference:
There is air in the hollow glass, and vacuum in the vacuum glass.
Vacuum glass is much thinner than insulating glass.
The following table has specific data, so you can compare the gap.
Next, let’s take a look at all aspects of vacuum glass performance.
Sound Insulation Performance
As we all know, the propagation of sound requires the participation of the medium.
Solid, liquid and gas can be used as the medium of sound transmission.
In a vacuum without a medium, sound cannot be transmitted.
The excellent sound insulation and noise reduction performance of vacuum glass is based on this principle.
The vacuum layer of vacuum glass can effectively block the transmission of sound.
The transmission of vacuum glass sound is mainly realized through the solid transmission of glass panels, supports and surrounding seals.
The sound insulation effect is remarkable for the strong penetrating low-frequency noise, and the weighted sound insulation can easily reach 36dB.
Glass Thickness
Vacuum glass is easier to achieve the required sound insulation and heat insulation performance through a smaller thickness.
In other words, in order to achieve the same sound insulation and heat insulation performance, the vacuum glass solution can achieve a thinner glass thickness, which means that the glass is thinner.
This makes storage and transportation costs lower.
Thermal Insulation
The vacuum layer in the middle of the vacuum glass reduces the heat transferred by the conduction and convection of the gas so low that it can be ignored.
Therefore, this form of vacuum glass is easier to achieve better thermal insulation performance.
Due to the difference in structure, the heat transfer mechanism of insulating glass and vacuum glass is also different.
The heat transfer in the center of the vacuum glass consists of radiation heat transfer and support heat transfer (ignoring residual gas heat transfer).
Insulating glass is composed of gas heat transfer (including conduction and convection) and radiation heat transfer.
Therefore, to reduce the heat transfer caused by the temperature difference, both insulating glass and vacuum glass need to reduce radiant heat transfer.
The most effective method is to use low-emissivity coated glass (LowE glass).
On the premise of taking into account other optical performance requirements of glass, the lower the emissivity (or emissivity), the better.
At least one piece of vacuum glass should be Low-E glass.
Since the heat transfer in the center of the vacuum glass is largely achieved by radiation, whether LowE glass is used or even the difference in the surface emissivity of the LowE glass will have a great impact on the heat insulation performance of the vacuum glass.
Vacuum Glass See the data below.
Vacuum Glass Styles | Glass Configuration | Surface Emissivity | U-Value (W/m2K) |
Clear glass | 5T+0.3V+5T | 0.84 | 2.228 |
Sigle silver low-E glass | 5TL+0.3V+5T | 0.09 | 0.814 |
Double silver low-E glass | 5TL+0.3V+5T | 0.048 | 0.675 |
Triple silver low-E glass | 5TL+0.3V+5T | 0.013 | 0.549 |
T: Tempered glass | L: Low-E glass | V: Vacuum |
In the actual whole window application, vacuum glass often adopts the form of “vacuum + hollow” combined vacuum glass.
This structure is equivalent to taking the vacuum glass as a piece of glass and then forming a hollow with another piece of flat glass.
It can also be made into a hollow combination form such as “hollow + vacuum + hollow” or “vacuum + hollow + vacuum”.
Such a combination can also improve safety and sound insulation performance.
In addition, double vacuum layer vacuum glass, vacuum laminated glass, vacuum laminated + insulating glass, and other combined forms also exist.
Glass Styles | Glass Configuration | Surface Emissivity | U-Value (W/m2K) | Glass Thick(mm) | |
Insulated Glass | 5TL+12A+5TL+12A+5T | Sigle silver low-E glass | 0.09 | 1.005 | 39 |
Double silver low-E glass | 0.048 | 0.944 | |||
Triple silver low-E glass | 0.013 | 0.891 | |||
Single Layer Vacuum Glass | 5TL+0.3V+5T | Sigle silver low-E glass | 0.09 | 0.814 | 10.3 |
Double silver low-E glass | 0.048 | 0.675 | |||
Triple silver low-E glass | 0.013 | 0.549 | |||
Vacuum Insulated Glass | 5T+12A+5TL+0.3V+5T | Sigle silver low-E glass | 0.09 | 0.699 | 27.3 |
Double silver low-E glass | 0.048 | 0.592 | |||
Triple silver low-E glass | 0.013 | 0.491 | |||
Double Layers Vacuum Glass | 5TL+0.3V+5TL+0.3V+5T | Sigle silver low-E glass | 0.09 | 0.440 | 15.6 |
Double silver low-E glass | 0.048 | 0.359 | |||
Triple silver low-E glass | 0.013 | 0.289 |
T: Tempered glass L: Low-E glass V: Vacuum A: Air
In summary, the performance of vacuum glass is indeed excellent, contact us for more information.
Eliterglass is able to manufacture, supply deliver to worldwide all kinds of high-performance energy-saving glass, including double and triple silver low-E coatings glass, warm edge space glass, triple insulated glass units, etc.
Contact us: [email protected]