2D Computational Analysis of a Vacuum Glazing Installation in a Wood-Based Window Frame in the Context of the Linear Thermal Transmittance Ψ_g

This study investigates the linear thermal transmittance coefficient Ψ_g of vacuum glazing when installed in a wooden window frame. Vacuum glazing is a promising technology for enhancing the energy efficiency of a building by eliminating convective and conductive heat transfer within a vacuum gap. However, thermal losses at the edge seal can significantly impact its overall performance. A 2D computational analysis was conducted to evaluate Ψ_g values for different vacuum glazing configurations and installation positions. Unlike previous studies, this research systematically analyzes the effect of the depth of an installation on Ψ_g and the internal surface temperature at the glazing-frame interface. The findings indicate that vacuum glazing with an indium-based edge seal exhibits Ψ_g values comparable to insulating glazing units with metallic spacers, while vacuum glazing with a glass fusion seal achieves lower Ψ_g values. Furthermore, the study emphasizes that increasing the depth of an installation significantly reduces Ψg and improves the distribution of the surface temperature, thereby mitigating the risk of condensation. These results provide valuable insights into optimizing the integration of vacuum glazing in wooden window frames and offer practical guidelines for enhancing thermal efficiency in building applications.