What is the thermal insulation performance of sandwich glass

Source：www.cnxingfu.net Release date： 2025-02-17

Information summary：The thermal insulation performance of laminated glass is influenced by various factors and has certain advantages compared to ordinary glass. However, there are differences compared to some specialized insulation glass (such as low-e glass). The following is a specific introduction:

The thermal insulation performance of sandwich glass is influenced by various factors and has certain advantages compared to ordinary glass. However, there are differences compared to some specialized insulation glass (such as low-e glass). The following is a specific introduction:
1. Thermal insulation principle: sandwich glass is generally composed of two or more pieces of glass with one or more layers of organic polymer intermediate film sandwiched between them. After special high-temperature preloading (or vacuuming) and high-temperature and high-pressure processing, the glass and intermediate film are bonded together. The middle film layer (such as PVB film) can block some heat transfer because it is a poor conductor of heat and can reduce heat conduction through the glass to a certain extent.
2. Blocking infrared radiation: Infrared radiation is one of the important carriers of heat transfer, and the intermediate film in laminated glass has a certain blocking effect on infrared radiation. Taking the common PVB laminated glass as an example, it can block some infrared rays, reduce the exchange of indoor and outdoor heat through the glass, thus playing a certain insulation effect, making the indoor temperature relatively stable, and reducing the frequency and energy consumption of air conditioning and other refrigeration equipment.
3. Compared with ordinary glass: Ordinary single-layer glass has a higher heat transfer coefficient, and heat is easily conducted through the glass, resulting in poor thermal insulation performance. Due to the presence of the intermediate film, the heat transfer coefficient of laminated glass is significantly lower than that of ordinary glass, and its thermal insulation performance is significantly improved. For example, the heat transfer coefficient of 5mm ordinary glass is about 5.8W/(m ² · K), while the heat transfer coefficient of 5mm+0.76PVB+5mm laminated glass is about 3.5-4.5W/(m ² · K), which can effectively reduce heat transfer and improve indoor thermal comfort.
4. Compared with other insulation glass: Compared with specialized insulation glass such as insulating glass and low-e glass, sandwich glass has relatively weaker insulation performance. Hollow glass is formed by an air layer between two or more layers of glass to reduce heat conduction. Low-E glass is coated with a low emissivity film on its surface, which can more effectively block infrared and ultraviolet rays. For example, the heat transfer coefficient of low-e insulating glass with the same specifications can be as low as 1.8-2.5W/(m ² · K), which is superior to laminated glass in terms of thermal insulation performance.
5. Influencing factors: The thermal insulation performance of sandwich glass is also affected by factors such as glass thickness, material and thickness of the intermediate film. Generally speaking, the thicker the glass and the thicker the intermediate film, the better the thermal insulation performance; The insulation performance of intermediate films made of different materials also varies.
Overall, the thermal insulation performance of sandwich glass is better than that of ordinary glass, which can meet the basic needs of insulation in fields such as construction and automobiles to a certain extent. However, its thermal insulation performance is not outstanding among specialized insulation glass. In practical applications, the appropriate type of glass can be selected based on specific insulation requirements and usage scenarios.

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