Effects of edge-seal design on the mechanical and thermal performance of vacuum-insulated glazing

Zhu, Wenyuan; Shah, Bipin; Gorti, Sarma; Bhandari, Mahabir; Sabau, Adrian S.; Shin, Seungha

doi:10.1016/j.buildenv.2022.109572

Title: Effects of edge-seal design on the mechanical and thermal performance of vacuum-insulated glazing

Journal Article · 05 September 2022 · Building and Environment

DOI: https://doi.org/10.1016/j.buildenv.2022.109572 · OSTI ID:1895229

^[1]; Shah, Bipin ^[2];

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Univ. of Tennessee, Knoxville, TN (United States)
WinBuild, Inc., Fairfax, VA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Although vacuum-insulated glazing (VIG) has been proposed as a promising solution towards developing energy-efficient buildings, VIGs have not become popular in the market due to several technical challenges including the complexity of the fabrication process. In particular, the edge-seal is a key component that significantly affects the thermal insulation and mechanical performance, and the development of edge-seal with adequate thermal insulation, mechanical strength, and reasonable processing cost is essential to overcome such technical issues in VIG. For this purpose, effects of edge-seal design parameters on the VIG performance should be identified. In this research, we analyzed the edge-seal for thermal transport as well as structural stresses to study the effects, and then identified and evaluated the material mixes for the edge-seal requirements. Here, the finite element simulations showed the significance of VIG corner calculation on overall thermal transmittance and the importance of seal conductivity below 1 W/m.K. The experiments with the flexible seals with different ratios of fine glass powder demonstrated that the measured shear strength values for the seal with less than 30% glass powder were more than 10 times larger than the calculated shear stress values. Based on these simulation and experimental results, a flexible sealant was developed using a proprietary mix of ceramic materials that meets the requirements of the designed VIG edge-seal, including structural as well as thermal stress resistance and a low conductivity. Moreover, the sealant is self-curing under atmospheric conditions, and thus it does not require costly inline process of laser curing or oven baking.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Building Technologies Office

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1895229

Journal Information:: Building and Environment, Journal Name: Building and Environment Vol. 224; ISSN 0360-1323

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Effects of edge-seal design on the mechanical and thermal performance of vacuum-insulated glazing

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