Are the U-values (K-values) of all vacuum glazing the same?
The answer is no. The U-value of vacuum glass is directly influenced by factors including the internal vacuum level, the material and spacing of the support pillars, the radius of the support pillars, and the type of low-emissivity (Low-E) glass used.
Vacuum glass is no longer unfamiliar to most people; however, are the U-values (thermal transmittance) of all vacuum glass products identical?
The answer is no. The U-value of vacuum glass is directly influenced by factors such as the internal vacuum level, the material and spacing of the support pillars, the radius of the support pillars, and the type of low-emissivity (Low-E) glass used.
As consumers, we must understand the specific technical details of vacuum glass when purchasing it. The U-values of vacuum glass products can vary significantly depending on the manufacturer and configuration.
Today, we will quantify how much various factors affect the U-value of vacuum glass.
Software used for calculation:
GlasSmart1000 (Vacuum Version)
Calculation standard: JGJ 113
Influence of Support Pillar Spacing
We use single-silver Low-E glass (emissivity = 0.09), assuming an internal vacuum level of 0.01 Pa, stainless-steel support pillars with a radius of 0.3 mm and a height of 0.2 mm (i.e., the vacuum layer thickness—this parameter will not be repeated later).
We calculate the U-value of vacuum glass for support pillar spacings of 30 mm, 40 mm, and 50 mm.
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