The Influence of Electrochromic Film on Indoor Environmental Quality

Kuan-Ting Yeh, Wei-Chieh Hu, Chun-Kuei Chen (), Ta-Hui Lin (), Feng-Yi Lin, Chung-Chih Cheng, Tzu-Ching Su and Pei-Yu Yu
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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
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

Energies, 2025, vol. 18, issue 10, 1-17

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.

Keywords: electrochromic film; indoor comfort; electricity consumption; building orientation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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