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Home / News / Industry News / Why does the triple silver coating of energy saving insulated glass have a lower emissivity?
The lower emissivity (low-E) of a triple silver coating on energy-saving insulated glass is achieved through the careful engineering of the coating's optical properties, specifically its ability to selectively reflect and transmit different wavelengths of electromagnetic radiation, including infrared (IR) radiation. Here's why triple silver coatings have lower emissivity:
1. Multiple Layers of Silver: Triple silver coatings are constructed with multiple layers of silver, typically three or more. Each layer of silver is precisely deposited onto the glass surface, forming a complex structure with varying thicknesses. These layers of silver interact with incoming thermal radiation in a way that allows them to control emissivity effectively.
2. Selective Spectral Properties: The design of triple silver coatings is optimized to selectively reflect and transmit specific wavelengths of radiation. They are engineered to be highly reflective in the infrared portion of the electromagnetic spectrum, which is responsible for heat transfer. By reflecting a significant portion of IR radiation, the coating reduces the glass's ability to emit heat.
3. Minimization of Radiative Heat Transfer: Emissivity is a measure of a material's ability to radiate heat as infrared radiation. When triple silver coatings reflect a substantial portion of incoming IR radiation, they minimize the amount of thermal energy that can be radiated from the glass surface. This is crucial for energy efficiency because it means that heat is retained inside the building during cold weather.
4. Balanced Light Transmission: While triple silver coatings are highly effective at controlling heat transfer, they are also engineered to allow a substantial amount of visible light to pass through. This balance between reducing emissivity for thermal insulation and maintaining visible light transmission is a key feature of their design. It ensures that the coated glass remains suitable for use in buildings, providing daylighting and visibility without compromising energy efficiency.
5. Year-Round Performance: Triple silver coatings are designed to offer excellent thermal performance throughout the year, reducing both cooling and heating energy loads. They help keep indoor spaces comfortable in hot weather by blocking solar heat gain and retain warmth in cold weather by reducing heat loss.
6. Compliance with Energy Standards: The ability of triple silver coatings to achieve low emissivity is essential for meeting or exceeding energy efficiency standards and codes, such as those set by ENERGY STAR, LEED certification, and local building energy codes.
The lower emissivity of triple silver coatings is the result of their advanced design, which optimizes the coating's spectral properties to minimize the radiative heat transfer while maintaining visible light transmission. This characteristic makes them highly effective in improving the energy efficiency and thermal comfort of buildings.
