Thermal Irregularities in Vacuum Glazing

Abstract

This document deals with the determination of thermal irregularities of wood-aluminium window with vacuum glazing. Test measurements were performed with guarded hot-box method at defined different temperature difference. They describe how the support pillars influence internal surface temperature distribution and how the edge vacuum glazing influence surface temperature around edge of vacuum glazing in wood-aluminium window. The deformation of the temperature field due to support pillars is surprisingly small and its range is from 0.20 K to 0.46 K with temperature difference on both sides of approximately 20 K. Decrease of internal surface temperature from the middle of the vacuum glass to edge is about 20.04 – 16.15 = 3.89 K, and so it is considerable effect. The effect of the edge on the glazing is not explicitly quantified in the term of heat flow in this document, but is implicitly documented by means of surface temperature. Thermography was used to check if there are touching points between glasses where distance is from 0.15 to 0.2 mm. The vacuum glazing measured in this work was a sample, which was fabricated in the Beijing Synergy Vacuum Glazing Technology Co., Ltd. The window was tested one year after delivery from the producer.