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Quantifying of Vision through Polymer Dispersed Liquid Crystal Double-Glazed Window

Author

Listed:
  • Mohammed Lami

    (Industry & Innovation Research Institute, Sheffield Hallam University, Sheffield S1 1WB, UK)

  • Faris Al-naemi

    (Industry & Innovation Research Institute, Sheffield Hallam University, Sheffield S1 1WB, UK)

  • Hameed Alrashidi

    (Kuwait Fund for Arab Economic Development, Mubarak Al-Kabeer St., Safat, P.O. Box 2921, Kuwait City 13030, Kuwait)

  • Walid Issa

    (Industry & Innovation Research Institute, Sheffield Hallam University, Sheffield S1 1WB, UK)

Abstract

The visual linking of a building’s occupants with the outside views is a basic property of windows. However, vision through windows is not yet a metricized factor. The previous research employs a human survey methods to assess the vision through conventional windows. The recently fabricated smart films add a changeable visual transparency feature to the windows. The varied operating transparency challenges the evaluation of vision. Therefore, surveying human preferences is no longer a feasible approach for smart windows. This paper proposes an image-processing-based approach to quantify the vision quality through smart windows. The proposed method was experimentally applied to a polymer dispersed liquid crystal (PDLC) double-glazed window. The system instantaneously determines the available contrast band of the scenes seen through the window. The system adjusts the excitation of the PDLC film to maintain a desired vision level within the determined vision band. A preferred vision ratio ( PVR ) is proposed to meet the requirements of occupant comfort. The impact of the PVR on vision quality, solar heat gain, and daylight performance was investigated experimentally. The results show that the system can determine the available vision comfort band during daytime considering different occupant requirements.

Suggested Citation

  • Mohammed Lami & Faris Al-naemi & Hameed Alrashidi & Walid Issa, 2022. "Quantifying of Vision through Polymer Dispersed Liquid Crystal Double-Glazed Window," Energies, MDPI, vol. 15(9), pages 1-23, April.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:9:p:3196-:d:803412
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    References listed on IDEAS

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    1. Myunghwan Oh & Chulsung Lee & Jaesung Park & Kwangseok Lee & Sungho Tae, 2019. "Evaluation of Energy and Daylight Performance of Old Office Buildings in South Korea with Curtain Walls Remodeled Using Polymer Dispersed Liquid Crystal (PDLC) Films," Energies, MDPI, vol. 12(19), pages 1-26, September.
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    3. Michaela Detsi & Aris Manolitsis & Ioannis Atsonios & Ioannis Mandilaras & Maria Founti, 2020. "Energy Savings in an Office Building with High WWR Using Glazing Systems Combining Thermochromic and Electrochromic Layers," Energies, MDPI, vol. 13(11), pages 1-18, June.
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