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Thermal Performance Optimization and Experimental Evaluation of Vacuum-Glazed Windows Manufactured via the In-Vacuum Method

Author

Listed:
  • Jaesung Park

    (Energy Efficiency Building Materials Center, Energy Division, Korea Conformity Laboratories (KCL), 73, Yangcheong 3-gil, Ochang-eup, Cheongju-si 28115, Chungbuk, Korea)

  • Myunghwan Oh

    (Energy Efficiency Building Materials Center, Energy Division, Korea Conformity Laboratories (KCL), 73, Yangcheong 3-gil, Ochang-eup, Cheongju-si 28115, Chungbuk, Korea)

  • Chul-sung Lee

    (Future Agricultural Research Division, Rural Research Institute, 870, Haean-ro, Sangnok-gu, Ansan-si 15634, Gyeonggi-do, Korea)

Abstract

Windows are essential in buildings; however, they have poor thermal performance, so extensive research has been conducted on improving their performance. In this study, we developed vacuum-glazed windows with excellent insulation via the in-vacuum method, which shortens the manufacturing time and vacuuming degree considerably. In addition, the configuration of the pillars, low-emissivity (low-e) coating, and frame from a thermal performance perspective was experimentally optimized. The results revealed that the optimal pillar placement spacing is 40 mm and that the low-e coating surface must be located inside the vacuum layer to maximize insulation performance. The vacuum-glazed window produced by the in-vacuum method was applied to an actual residential building to investigate its thermal performance, which was compared with that of a triple-glazed window. The results showed that the center-of-glazing heat flow of the vacuum-glazed window was approximately 0.8 W/m 2 K lower than that of the triple-glazed window. The difference between the average indoor and outdoor surface temperatures during the nighttime was found to be up to 35.1 °C for the vacuum-glazed window and 23.1 °C for the triple-glazed window. Therefore, the energy efficiency of the building can be greatly improved by applying vacuum windows manufactured via the in-vacuum method and optimized for the best thermal performance.

Suggested Citation

  • Jaesung Park & Myunghwan Oh & Chul-sung Lee, 2019. "Thermal Performance Optimization and Experimental Evaluation of Vacuum-Glazed Windows Manufactured via the In-Vacuum Method," Energies, MDPI, vol. 12(19), pages 1-19, September.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:19:p:3634-:d:270120
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    References listed on IDEAS

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    1. Seung-Chul Kim & Jong-Ho Yoon & Ru-Da Lee, 2017. "Energy Performance Assessment of a 2nd-Generation Vacuum Double Glazing Depending on Vacuum Layer Position and Building Type in South Korea," Energies, MDPI, vol. 10(8), pages 1-15, August.
    2. Ghosh, Aritra & Sundaram, Senthilarasu & Mallick, Tapas K., 2019. "Colour properties and glazing factors evaluation of multicrystalline based semi-transparent Photovoltaic-vacuum glazing for BIPV application," Renewable Energy, Elsevier, vol. 131(C), pages 730-736.
    3. Ghosh, Aritra & Sundaram, Senthilarasu & Mallick, Tapas K., 2018. "Investigation of thermal and electrical performances of a combined semi-transparent PV-vacuum glazing," Applied Energy, Elsevier, vol. 228(C), pages 1591-1600.
    4. Manz, Heinrich, 2008. "On minimizing heat transport in architectural glazing," Renewable Energy, Elsevier, vol. 33(1), pages 119-128.
    5. Soo Cho & Seok-Hyun Kim, 2017. "Analysis of the Performance of Vacuum Glazing in Office Buildings in Korea: Simulation and Experimental Studies," Sustainability, MDPI, vol. 9(6), pages 1-15, June.
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