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The Effects of Exterior Glazing on Human Thermal Comfort in Office Buildings

Author

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  • Bing Song

    (College of Architecture, Xi’an University of Architecture and Technology, Xi’an 710055, China
    State Key Laboratory of Green Building, Xi’an University of Architecture and Technology, Xi’an 710055, China)

  • Lujian Bai

    (College of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an 710054, China)

  • Liu Yang

    (College of Architecture, Xi’an University of Architecture and Technology, Xi’an 710055, China
    State Key Laboratory of Green Building, Xi’an University of Architecture and Technology, Xi’an 710055, China)

Abstract

As a major component of the building envelope, the energy-saving design of exterior windows is key to energy savings in office buildings. The conventional design of exterior windows mainly focused on their impact on heating and cooling energy but ignored the indoor thermal comfort problems caused by the direct solar radiation transmitted by windows and the fluctuation of their internal surface temperatures. This study analyzed the influence of exterior windows on the indoor thermal environment of office buildings by carrying out field experiments. The experiments were carried out in a typical office building in Xi’an during December and January. The impact of exterior windows on human thermal comfort was studied from two perspectives: longwave radiation from the surface of window glass and solar shortwave radiation. It was found that solar radiation was the main cause of temperature fluctuations on the internal surface of windows and created non-uniform thermal environments. The mean radiant temperature fluctuations in the near-window area could reach up to 7.8 °C due to outdoor solar radiation in winter. Solar radiation transmitted by windows directly affects thermal sensations. Since conventional thermal comfort models or indices underestimated the thermal sensations of occupants in the presence of solar radiation, the additional thermal loads caused by solar radiation needed to be taken into account. The allowable operative temperature range for maintaining thermal comfort should be reduced by 0.5 °C when occupants are exposed to solar radiation.

Suggested Citation

  • Bing Song & Lujian Bai & Liu Yang, 2024. "The Effects of Exterior Glazing on Human Thermal Comfort in Office Buildings," Energies, MDPI, vol. 17(4), pages 1-16, February.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:4:p:776-:d:1334381
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    References listed on IDEAS

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    1. Cuce, Erdem & Riffat, Saffa B., 2015. "A state-of-the-art review on innovative glazing technologies," Renewable and Sustainable Energy Reviews, Elsevier, vol. 41(C), pages 695-714.
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