环境温度对服役中真空玻璃真空度的影响

Effect of ambient temperature on the vacuum degree of vacuum glazing in service

真空玻璃的总热流可以综合辐射传热、支撑物传热以及残余气体传热等来估算。其中残余气体传热是与真空度紧密相关的。在真空玻璃制备的过程中,残余气体溶入或吸附于真空玻璃内表面。当真空玻璃所处环境温度升高时,气体分子剧烈运动,真空玻璃的内部压强也随之增大(即真空度降低)。而真空玻璃的热传导与其内部压强成正比,故真空玻璃所处环境温度升高,真空玻璃的热传导也增强,使得其隔热保温性能变差。本文根据悉尼大学实验室的数据拟合函数,以此预测高温环境下真空玻璃的内部压强值。

The total heat flux of vacuum glazing can be estimated by the heat transfer of radiation, supporting material and residual gas. The heat transfer of residual gas is closely related to the vacuum degree. In the process of vacuum glazing preparation, residual gas is dissolved or adsorbed on the glazing inner surface. When the temperature of the vacuum glazing is higher, the gas molecules become intense, and the glazing internal pressure increases（ i. e., the vacuum degree is decreased）.The heat conduction of the vacuum glazing is proportional to its internal pressure. When the temperature of the vacuum glazing increase, its heat conduction is enhanced, and the thermal insulation performance becomes poor. According to the laboratory data of University of Sydney, the internal pressure of the vacuum glazing in high temperature environment was predicted.