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An investigation into the use of a wind shield to reduce the convective heat flux to a nocturnal radiative cooling surface

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  • Golaka, Auttapol
  • Exell, R.H.B.

Abstract

The effect of a wind shield on the convective heat flux from an ambient air stream blowing over a horizontal surface intended for nocturnal radiative cooling has been studied by computational fluid dynamical calculations and by wind tunnel experiments under conditions appropriate for the climate of Thailand. The test unit was a rectangular plate 312mm×250mm, with vertical metal strips for the wind shield having heights up to 100mm along the edges of the plate. It was found that a wind shield of height 25mm slightly increased the convective heat transfer due to increased turbulence over the surface, but wind shields of height 50mm and 100mm reduced the convection due to a separation of the main airflow from the surface. Radiative cooling was reduced by the wind shields. The net cooling of the surface was best with no wind shield at wind velocities less than about 1ms–1, and with the wind shield of height 100mm at wind velocities greater than about 2ms–1.

Suggested Citation

  • Golaka, Auttapol & Exell, R.H.B., 2007. "An investigation into the use of a wind shield to reduce the convective heat flux to a nocturnal radiative cooling surface," Renewable Energy, Elsevier, vol. 32(4), pages 593-608.
    • Handle: RePEc:eee:renene:v:32:y:2007:i:4:p:593-608
    DOI: 10.1016/j.renene.2006.03.007
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    References listed on IDEAS

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    1. Khedari, J. & Waewsak, J. & Thepa, S. & Hirunlabh, J., 2000. "Field investigation of night radiation cooling under tropical climate," Renewable Energy, Elsevier, vol. 20(2), pages 183-193.
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    3. Michell, D. & Biggs, K.L., 1979. "Radiation cooling of buildings at night," Applied Energy, Elsevier, vol. 5(4), pages 263-275, October.
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    Cited by:

    1. Zhang, Ji & Yuan, Jianjuan & Liu, Junwei & Zhou, Zhihua & Sui, Jiyuan & Xing, Jincheng & Zuo, Jian, 2021. "Cover shields for sub-ambient radiative cooling: A literature review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 143(C).
    2. Gopalakrishna Gangisetty & Ron Zevenhoven, 2023. "A Review of Nanoparticle Material Coatings in Passive Radiative Cooling Systems Including Skylights," Energies, MDPI, vol. 16(4), pages 1-59, February.
    3. Bijarniya, Jay Prakash & Sarkar, Jahar & Maiti, Pralay, 2020. "Review on passive daytime radiative cooling: Fundamentals, recent researches, challenges and opportunities," Renewable and Sustainable Energy Reviews, Elsevier, vol. 133(C).
    4. Lu, Xing & Xu, Peng & Wang, Huilong & Yang, Tao & Hou, Jin, 2016. "Cooling potential and applications prospects of passive radiative cooling in buildings: The current state-of-the-art," Renewable and Sustainable Energy Reviews, Elsevier, vol. 65(C), pages 1079-1097.
    5. Panchabikesan, Karthik & Vellaisamy, Kumaresan & Ramalingam, Velraj, 2017. "Passive cooling potential in buildings under various climatic conditions in India," Renewable and Sustainable Energy Reviews, Elsevier, vol. 78(C), pages 1236-1252.
    6. Liu, Junwei & Zhou, Zhihua & Zhang, Debao & Jiao, Shifei & Zhang, Ying & Luo, Longfei & Zhang, Zhuofen & Gao, Feng, 2020. "Field investigation and performance evaluation of sub-ambient radiative cooling in low latitude seaside," Renewable Energy, Elsevier, vol. 155(C), pages 90-99.
    7. Zhao, Bin & Hu, Mingke & Ao, Xianze & Chen, Nuo & Pei, Gang, 2019. "Radiative cooling: A review of fundamentals, materials, applications, and prospects," Applied Energy, Elsevier, vol. 236(C), pages 489-513.

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