How to Evaluate the Low Radiation Characteristics of Low-e Coated Glass?

Low-emissivity glass, collectively referred to as low-emission coated glass, also known as Low-e glass , is named for its extremely low surface emissivity. The "low radiation" of low-emissivity glass means that under the same temperature conditions, the film surface emits lower heat than the ordinary sheet glass.

Low-emissivity glass has a high transmittance for visible light with a wavelength range of 380-780 nm, which is beneficial for indoor lighting.It also has a higher reflectance for solar near-infrared radiation with a wavelength of 780-2500 nm, a higher reflectance for mid-far infrared radiation, and has a low emissivity characteristic, that is, the radiant heat of the flat glass on the low-radiation film surface is very low.

In layman's terms, low-emissivity glass can reflect most of the infrared radiation from the sun, and can also reduce the transmission of heat radiation energy inside and outside the house under the premise of ensuring higher visible light transmittance. Low-e glass has excellent heat insulation and thermal insulation properties.

We know that film surface emissivity is an important parameter to evaluate the performance of low-emissivity glass.

Low-emissivity coated glass stipulates that the radiation rate of the offline low-emissivity coated glass should be less than 0.15, and the emissivity of the online low-emissivity coated glass should be less than 0.25.