Quantifying of vision through polymer dispersed liquid crystal double-glazed window

LAMI, Mohammed, AL-NAEMI, Faris, ALRASHIDI, Hameed and ISSA, Walid (2022). Quantifying of vision through polymer dispersed liquid crystal double-glazed window. Energies, 15 (9): 3196.

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Official URL: https://www.mdpi.com/1996-1073/15/9/3196
Open Access URL: https://www.mdpi.com/1996-1073/15/9/3196/pdf?versi... (Published version)
Link to published version:: https://doi.org/10.3390/en15093196
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    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.

    Item Type: Article
    Additional Information: ** From MDPI via Jisc Publications Router ** Licence for this article: https://creativecommons.org/licenses/by/4.0/ **Journal IDs: eissn 1996-1073 **History: published 27-04-2022; accepted 25-04-2022
    Uncontrolled Keywords: vision through windows, visual comfort, PDLC smart film, smart windows, image processing
    Identification Number: https://doi.org/10.3390/en15093196
    SWORD Depositor: Colin Knott
    Depositing User: Colin Knott
    Date Deposited: 03 May 2022 14:06
    Last Modified: 09 May 2022 10:35
    URI: http://shura.shu.ac.uk/id/eprint/30178

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