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Experimental investigation of indoor lighting/thermal environment of liquid-filled energy-saving windows

Author

Listed:
  • Zhang, Chunxiao
  • Li, Dongdong
  • Wang, Lin
  • Yang, Qingpo
  • Guo, Yutao
  • Zhang, Wei
  • Shen, Chao
  • Pu, Jihong

Abstract

To enhance the effectiveness of energy-saving buildings, windows play a crucial role, as they contribute to comfort, energy efficiency, and adaptability. However, traditional static windows, which primarily focus on reducing solar radiation, struggle to strike a balance between heating/cooling requirements during winter and summer seasons. On the other hand, dynamic windows, while offering adjustability, suffer from issues such as high haze and poor color rendering, making them less suitable for residential buildings. In this study, we propose a novel reversible liquid-filled energy-saving window that effectively regulates indoor solar radiation heat gain. To evaluate the dynamic indoor light/heat environment provided by liquid-filled energy-saving windows, we conduct an experimental investigation. Results indicate that windows filled with 10 wt% and 20 wt% CuSO4 solution cause a 1.5 °C and 2.5 °C reduction in indoor mean air temperature compared to water-filled windows during the summer season. Similarly, in the winter season, the decrease is 1.4 °C and 0.5 °C, respectively. Moreover, there is no significant difference in indoor illuminance between energy-saving windows filled with 10 wt% and 20 wt% CuSO4 solution. With the mass concentration of 10%wt CuSO4 solution, indoor mean illuminance difference between the two groups is only 236 lux and 214 lux during the summer and winter seasons, respectively.

Suggested Citation

  • Zhang, Chunxiao & Li, Dongdong & Wang, Lin & Yang, Qingpo & Guo, Yutao & Zhang, Wei & Shen, Chao & Pu, Jihong, 2024. "Experimental investigation of indoor lighting/thermal environment of liquid-filled energy-saving windows," Renewable Energy, Elsevier, vol. 220(C).
    • Handle: RePEc:eee:renene:v:220:y:2024:i:c:s0960148123016191
    DOI: 10.1016/j.renene.2023.119704
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    References listed on IDEAS

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    Cited by:

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    2. Wu, Shuangdui & Zhu, Peijin & Song, Junkang & Sun, Hongli & Cheng, Zhu & Lin, Borong, 2024. "Design and application optimization of static and dynamic shading technologies in multi-climate based on parameter simulation," Renewable Energy, Elsevier, vol. 237(PC).
    3. Liu, Xingjiang & Yang, Haotian & Shen, Chao & LU, Lin & Wang, Julian, 2025. "Quantifying the parameter interaction of photovoltaic double skin façade: A sensitivity analysis based on second-order Morris method," Applied Energy, Elsevier, vol. 386(C).
    4. Li, Shuliang & Sha, Yong & Wu, Yihui & Gao, Yunrui & He, Miao & Wang, Xiaoliang & Yang, Li & Mai, Xianmin, 2025. "Experimental investigation of indoor lighting/thermal characteristics of highly sensitive mechano-chromic energy-saving windows," Energy, Elsevier, vol. 322(C).
    5. Wang, Lin & Li, Dongdong & Wang, Zhanwei & Ma, Aihua & Lang, Yu & Jin, Yitong & Fang, Juan, 2024. "Indoor dynamic light/thermal environment of smart windows using ATO nanofluids in summer: An experimental study," Renewable Energy, Elsevier, vol. 234(C).
    6. Ma, Yuxin & Gao, Enyuan & Zhang, Xiaosong & Huang, Shifang, 2024. "Parametric analysis and design optimization of a fully open absorption heat pump for heat and water recovery of flue gas," Applied Energy, Elsevier, vol. 375(C).
    7. Qu, Xiaosong & Liang, Hao & Wu, Gang & Feng, Chaoqing & Zhang, Yi & Liu, Zhikang & Yuan, Guanghao & Hai, Yunrui, 2024. "A novel study on spectral division and photothermal regulation in Chinese solar greenhouse derive from nanofluid," Energy, Elsevier, vol. 313(C).

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