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When thermochromic material meets shape memory alloy: A new smart window integrating thermal storage, temperature regulation, and ventilation

Author

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  • Yu, Wei
  • Zhou, Yang
  • Li, Zedian
  • Zhu, Dahai
  • Wang, Lingling
  • Lei, Qiuxing
  • Wu, Changheng
  • Xie, Huaqing
  • Li, Yifan

Abstract

Traditional windows have poor thermal insulation performance, resulting in significant indoor heat loss in winter and outdoor heat entry in summer. Thermochromic smart windows can effectively block solar radiant heat by automatically adjusting light transmittance, thereby reducing air conditioning loads and leading to significant energy savings. In this study, the poly N-isopropyl acrylamide (PNIPAm)-based thermochromic hydrogel, modified MXene nanoparticles, and NiTi shape memory alloy (SMA) are integrated to endow the smart window with heat storage, temperature control, and ventilation. The smart window achieves 88.6% visible light transmission and 70% solar modulation. The inclusion of MXene nanoparticles further enhances photothermal response efficiency, while the ventilation system ensures efficient and fresh indoor air circulation. Compared to the common glass, the smart window reduces the indoor temperature by 8 °C, demonstrating its excellent temperature regulation ability. Simulation results indicate that in Shanghai, Cairo, Singapore, and Kuwait, the employment of thermochromic smart windows can reduce heating, ventilation, and air conditioning energy consumption (HVAC) by 32.6%, 49.9%, 42.7%, and 34.1%, respectively. This versatile thermochromic smart window is expected to significantly improve building efficiency and occupant comfort, offering a sustainable solution for future building designs.

Suggested Citation

  • Yu, Wei & Zhou, Yang & Li, Zedian & Zhu, Dahai & Wang, Lingling & Lei, Qiuxing & Wu, Changheng & Xie, Huaqing & Li, Yifan, 2024. "When thermochromic material meets shape memory alloy: A new smart window integrating thermal storage, temperature regulation, and ventilation," Applied Energy, Elsevier, vol. 372(C).
    • Handle: RePEc:eee:appene:v:372:y:2024:i:c:s0306261924012042
    DOI: 10.1016/j.apenergy.2024.123821
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    References listed on IDEAS

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    1. Kumar, Prashant & Kishore, Ravi Anant & Maurya, Deepam & Stewart, Colin J. & Mirzaeifar, Reza & Quandt, Eckhard & Priya, Shashank, 2019. "Shape memory alloy engine for high efficiency low-temperature gradient thermal to electrical conversion," Applied Energy, Elsevier, vol. 251(C), pages 1-1.
    2. Eldho Abraham & Vladyslav Cherpak & Bohdan Senyuk & Jan Bart Hove & Taewoo Lee & Qingkun Liu & Ivan I. Smalyukh, 2023. "Highly transparent silanized cellulose aerogels for boosting energy efficiency of glazing in buildings," Nature Energy, Nature, vol. 8(4), pages 381-396, April.
    3. Sadineni, Suresh B. & Madala, Srikanth & Boehm, Robert F., 2011. "Passive building energy savings: A review of building envelope components," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(8), pages 3617-3631.
    4. Seungkyu Lee & Heather A. Calcaterra & Sangmin Lee & Wisnu Hadibrata & Byeongdu Lee & EunBi Oh & Koray Aydin & Sharon C. Glotzer & Chad A. Mirkin, 2022. "Shape memory in self-adapting colloidal crystals," Nature, Nature, vol. 610(7933), pages 674-679, October.
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