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On daytime radiative cooling using spectrally selective metamaterial based building envelopes

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  • Yuan, Jinchao
  • Yin, Hongle
  • Yuan, Dan
  • Yang, Yongjian
  • Xu, Shaoyu

Abstract

Recent developments in metamaterials made daytime radiative cooling possible, by engineering material surfaces to achieve high emissivity in the 8–13 μm atmospheric window and high reflectivity elsewhere. In this study, we demonstrated a daytime radiative cooling application using a scalable polymer-based spectrally selective metamaterial (named Radiative Cooling film (RC-film)) to passively cool a full-scale model house. When exposed under direct solar irradiation peaking 720 W/m2, the RC-film model house achieved a roof surface temperature of consistently 2–9 °C below the ambient during a continuous 72-h experiment period. Further, setting a new milestone, the indoor air temperature of the RC-film house was also consistently 2–14 °C below the ambient during the daytime. This implies that the RC-film envelope had achieved a de facto cooling effect on the indoor space without active energy consumption. Compared to a metal sheet house, the RC-film house achieved a 25–30 °C cooler roof temperature and a 4–12 °C cooler indoor temperature during the daytime. For the South wall where the most solar radiation was received, the RC-film envelope demonstrated a 60–70% heat influx reduction. The entire exposed envelope as a whole achieved an aggregated radiative cooling power ranges from 5 to 55 W/m2 during the testing days.

Suggested Citation

  • Yuan, Jinchao & Yin, Hongle & Yuan, Dan & Yang, Yongjian & Xu, Shaoyu, 2022. "On daytime radiative cooling using spectrally selective metamaterial based building envelopes," Energy, Elsevier, vol. 242(C).
    • Handle: RePEc:eee:energy:v:242:y:2022:i:c:s0360544221030280
    DOI: 10.1016/j.energy.2021.122779
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    References listed on IDEAS

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    Cited by:

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    2. Li, Haoran & Zhang, Kai & Shi, Zijie & Jiang, Kaiyu & Wu, Bingyang & Ye, Peiliang, 2023. "Cooling benefit of implementing radiative cooling on a city-scale," Renewable Energy, Elsevier, vol. 212(C), pages 372-381.
    3. Jiang, Kaiyu & Zhang, Kai & Shi, Zijie & Li, Haoran & Wu, Bingyang & Mahian, Omid & Zhu, Yutong, 2023. "Experimental and numerical study on the potential of a new radiative cooling paint boosted by SiO2 microparticles for energy saving," Energy, Elsevier, vol. 283(C).
    4. Huang, Jiachen & Zhang, Xuan-kai & Yu, Xiyu & Tang, G.H. & Wang, Xinyu & Du, Mu, 2024. "Scalable self-adaptive radiative cooling film through VO2-based switchable core–shell particles," Renewable Energy, Elsevier, vol. 224(C).
    5. Xie, Xing & Xu, Bin & Cheng, Yuan-xia & Pei, Gang, 2023. "New method of integrating experiment for maintaining low indoor temperature into numerical modelling: A feasibility demonstration in reduced-scale building model," Energy, Elsevier, vol. 284(C).
    6. Xueke Wu & Jinlei Li & Fei Xie & Xun-En Wu & Siming Zhao & Qinyuan Jiang & Shiliang Zhang & Baoshun Wang & Yunrui Li & Di Gao & Run Li & Fei Wang & Ya Huang & Yanlong Zhao & Yingying Zhang & Wei Li & , 2024. "A dual-selective thermal emitter with enhanced subambient radiative cooling performance," Nature Communications, Nature, vol. 15(1), pages 1-11, December.
    7. Chien, Chih-Cheng & Lin, Po-Hung & Chiang, Chih-Chan & Chen, Yu-Bin, 2022. "Realization of energy harvesting and temperature indication functions for zero-energy thermos flask," Energy, Elsevier, vol. 257(C).

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