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Extending the operation of a solar air collector to night-time by integrating radiative sky cooling: A comparative experimental study

Author

Listed:
  • Hu, Mingke
  • Zhao, Bin
  • Suhendri,
  • Cao, Jingyu
  • Wang, Qiliang
  • Riffat, Saffa
  • Su, Yuehong
  • Pei, Gang

Abstract

Solar thermal collectors are generally unproductivity at night without sunlight. Radiative cooling, on the other hand, is another renewable technology harvesting coldness from extraterrestrial space and can effectively work nocturnally. Therefore, this study proposes a scheme that integrates the nocturnal radiative cooling mechanism into a solar air collector as a supplementary. Incoming air is heated by the solar absorber during the daytime and cooled down by the glass cover at night. Experimental results indicate that, with an air mass flow rate of 0.03 kg/s, the dual-mode collector (named as PT-RC collector) realized a daytime solar thermal efficiency of 34.2% at zero-reduced temperature (e.g., when the inlet air temperature equals the ambient temperature) and a net radiative cooling power (e.g., when the inlet air temperature equals the ambient temperature) of 27.9 W/m2, which are 72.2% and 2.4 times those of the typical solar air collector. As the air mass flow rate increased from 0.01 to 0.05 kg/s, the two performance indicators lifted from 19.8% to 34.5% and from 16.9 to 33.0 W/m2, respectively. The PT-RC collector shows potential to be applied in four-season regions where heating and cooling are both required throughout the year or tropical zones where cooling is much more desired.

Suggested Citation

  • Hu, Mingke & Zhao, Bin & Suhendri, & Cao, Jingyu & Wang, Qiliang & Riffat, Saffa & Su, Yuehong & Pei, Gang, 2022. "Extending the operation of a solar air collector to night-time by integrating radiative sky cooling: A comparative experimental study," Energy, Elsevier, vol. 251(C).
  • Handle: RePEc:eee:energy:v:251:y:2022:i:c:s0360544222008891
    DOI: 10.1016/j.energy.2022.123986
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    References listed on IDEAS

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    2. Jia, Linrui & Lu, Lin & Gong, Quan & Jiao, Kai, 2024. "Analytical and experimental analyses on cooling performances of radiative SkyCool radiators with various interior flowing channels," Energy, Elsevier, vol. 295(C).
    3. Dong, Yan & Zou, Yanan & Li, Xiang & Wang, Fuqiang & Cheng, Ziming & Meng, Weifeng & Chen, Lingling & Xiang, Yang & Wang, Tong & Yan, Yuying, 2023. "Introducing masking layer for daytime radiative cooling coating to realize high optical performance, thin thickness, and excellent durability in long-term outdoor application," Applied Energy, Elsevier, vol. 344(C).
    4. 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).
    5. Dong, Yan & Zhang, Xinping & Chen, Lingling & Meng, Weifeng & Wang, Cunhai & Cheng, Ziming & Liang, Huaxu & Wang, Fuqiang, 2023. "Progress in passive daytime radiative cooling: A review from optical mechanism, performance test, and application," Renewable and Sustainable Energy Reviews, Elsevier, vol. 188(C).
    6. Pospíšilík, Václav & Honus, Stanislav & Lukeš, Roman & Jadlovec, Marek & Štukavec, Ondřej, 2024. "Differences in heat losses between glazing of various emissivities related to night sky radiation: Experimental and numerical analysis," Energy, Elsevier, vol. 290(C).

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