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Investigation of vacuum-integrated switchable polymer dispersed liquid crystal glazing for smart window application for less energy-hungry building

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  • Ghosh, Aritra

Abstract

The presence of more than one transparency and controllable intermediate transmission between ON and OFF states make the switchable smart glazing more attractive for less energy-hungry building integration than a static transparent window. However, to enable this switchable glazing for cold climatic buildings, overall heat transfer through the glazing needs to be reduced. In this work, the thermal and optical performance of integrated polymer dispersed liquid crystal and low heat loss transparent vacuum glazing was investigated using indoor characterisation. Two systems were developed where PDLC glazing was sandwiched between a vacuum and one acrylic sheet (Vacuum-PDLCA) and vacuum and glass (Vacuum-PDLCG). The employment of acrylic sheets reduced 21% of the overall weight of the system which made it suitable for retrofit building integration. Use of acrylic reduced 35% of solar transmission of PDLC ON state compared to the use of glass. Overall heat transfer coefficient (U-value) or thermal transmittance was below 1.1 W/m2K for all Vacuum -PDLCG and Vacuum-PDLCA ON and OFF states. Solar heat gain coefficient or solar energy transmittance was highest at 0.45 for the Vacuum-PDLCG ON state and lowest at 0.23 for the Vacuum-PDLCA OFF state.

Suggested Citation

  • Ghosh, Aritra, 2023. "Investigation of vacuum-integrated switchable polymer dispersed liquid crystal glazing for smart window application for less energy-hungry building," Energy, Elsevier, vol. 265(C).
    • Handle: RePEc:eee:energy:v:265:y:2023:i:c:s0360544222032820
    DOI: 10.1016/j.energy.2022.126396
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    References listed on IDEAS

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    10. Ghosh, Aritra & Norton, Brian & Duffy, Aidan, 2017. "Effect of sky clearness index on transmission of evacuated (vacuum) glazing," Renewable Energy, Elsevier, vol. 105(C), pages 160-166.
    11. Ghosh, Aritra & Norton, Brian & Duffy, Aidan, 2016. "Measured thermal performance of a combined suspended particle switchable device evacuated glazing," Applied Energy, Elsevier, vol. 169(C), pages 469-480.
    12. Ghosh, A. & Mallick, T.K., 2018. "Evaluation of colour properties due to switching behaviour of a PDLC glazing for adaptive building integration," Renewable Energy, Elsevier, vol. 120(C), pages 126-133.
    13. Ghosh, Aritra & Norton, Brian & Duffy, Aidan, 2015. "Measured overall heat transfer coefficient of a suspended particle device switchable glazing," Applied Energy, Elsevier, vol. 159(C), pages 362-369.
    14. Hoon Lee, Jae & Jeong, Jinhwa & Tae Chae, Young, 2020. "Optimal control parameter for electrochromic glazing operation in commercial buildings under different climatic conditions," Applied Energy, Elsevier, vol. 260(C).
    15. Mesloub, Abdelhakim & Ghosh, Aritra & Touahmia, Mabrouk & Albaqawy, Ghazy Abdullah & Alsolami, Badr M. & Ahriz, Atef, 2022. "Assessment of the overall energy performance of an SPD smart window in a hot desert climate," Energy, Elsevier, vol. 252(C).
    16. Ghosh, Aritra & Norton, Brian & Duffy, Aidan, 2016. "Measured thermal & daylight performance of an evacuated glazing using an outdoor test cell," Applied Energy, Elsevier, vol. 177(C), pages 196-203.
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    1. Lin-Rui Jia & Qing-Yun Li & Jie Yang & Jie Han & Chi-Chung Lee & Jian-Heng Chen, 2023. "Investigation of the Energy-Saving Potential of Buildings with Radiative Roofs and Low-E Windows in China," Sustainability, MDPI, vol. 16(1), pages 1-17, December.

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