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The Influence of Electrochromic Film on Indoor Environmental Quality

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  • Kuan-Ting Yeh

    (Department of Mechanical Engineering, National Cheng Kung University, Tainan 70101, Taiwan)

  • Wei-Chieh Hu

    (Research Center for Energy Technology and Strategy, National Cheng Kung University, Tainan 70101, Taiwan)

  • Chun-Kuei Chen

    (Research Center for Energy Technology and Strategy, National Cheng Kung University, Tainan 70101, Taiwan)

  • Ta-Hui Lin

    (Department of Mechanical Engineering, National Cheng Kung University, Tainan 70101, Taiwan
    Research Center for Energy Technology and Strategy, National Cheng Kung University, Tainan 70101, Taiwan)

  • Feng-Yi Lin

    (Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, 195, Sec. 4 Chung Hsing Rd., Chutung, Hsinchu 310401, Taiwan)

  • Chung-Chih Cheng

    (Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, 195, Sec. 4 Chung Hsing Rd., Chutung, Hsinchu 310401, Taiwan)

  • Tzu-Ching Su

    (Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, 195, Sec. 4 Chung Hsing Rd., Chutung, Hsinchu 310401, Taiwan)

  • Pei-Yu Yu

    (Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, 195, Sec. 4 Chung Hsing Rd., Chutung, Hsinchu 310401, Taiwan)

Abstract

This study was conducted at SPINLab. The full-scale experiments were performed using two experimental spaces of identical specifications to investigate the effects of electrochromic film (OG + EC ON or OG + EC OFF ) on indoor environment and air conditioning electricity consumption in buildings with different orientations (East and West). The electricity-saving effects are more pronounced on the building’s west-facing side than on its east-facing side. For the east-facing side, the average electricity savings for OG + EC ON and OG + EC OFF were 4.5%, and 5.1%, respectively. For the west-facing side, the average electricity savings increased to 9.2% and 9.4% for OG + EC ON and OG + EC OFF . The research results on thermal comfort indicate (PMV) that applying electrochromic film (OG + EC ON or OG + EC OFF ) significantly improved indoor thermal comfort compared to using clear glass (OG) alone. The visual comfort analysis results indicate that the opaque (OG + EC OFF ) and transparent (OG + EC ON ) states of electrochromic film could reduce daylight glare probability (DGP) values. However, due to the light-scattering properties of the liquid crystal droplets, the OG + EC OFF and OG + EC ON states of the electrochromic film increased DGP values in 26.5% and 41.5% of the cases, respectively, when sunlight directly entered the interior.

Suggested Citation

  • Kuan-Ting Yeh & Wei-Chieh Hu & Chun-Kuei Chen & Ta-Hui Lin & Feng-Yi Lin & Chung-Chih Cheng & Tzu-Ching Su & Pei-Yu Yu, 2025. "The Influence of Electrochromic Film on Indoor Environmental Quality," Energies, MDPI, vol. 18(10), pages 1-17, May.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:10:p:2499-:d:1654364
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    References listed on IDEAS

    as
    1. Tzu-Yang Hu & Chun-Kuei Chen & Wei-Chieh Hu & Ta-Hui Lin & Feng-Yi Lin & Chung-Chih Cheng & Tzu-Ching Su & Pei-Yu Yu, 2022. "A Study on Control Strategy for Air Conditioning of Western Exposed Rooms in Subtropical Region," Energies, MDPI, vol. 15(3), pages 1-16, January.
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