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Experimental analysis of thermal insulation and heat collection performance of a novel roof based on dynamic nanofluid spectral splitting in the glass greenhouse

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Listed:
  • Li, Tao
  • Ma, Jiangqiaoyu
  • Shi, Shaolong
  • Liu, Xiangyu
  • Yu, Junyong
  • Wang, Yanglun
  • Yuan, Yuan
  • Mao, Qianjun

Abstract

To reduce high indoor temperatures in glass greenhouses during summer, a dynamic nanofluid spectral splitter (DNSS) roof was designed. This system uses a nanofluid that absorbs heat, which is collected by an external circulation device. It helps cool the greenhouse and utilize solar heat. A stable CWO@TiO2 composite nanofluid with a 50 ppm concentration was prepared, showing a near-infrared shielding rate of 77.08 % and a visible light transmittance of 62.41 %. The DNSS roof system, with three different thicknesses, was tested for thermal insulation and heat collection. Compared to a 10 mm air roof, the 10 mm DNSS roof achieved a cooling effect of 16.90 °C and a heat collection rate of 732 W/m2. The average temperature drop for the 5 mm, 10 mm, and 15 mm thick roofs was 8.27 °C, 11.24 °C, and 9.27 °C, with daily heat gains of 81.48 MJ, 95.66 MJ, and 97.33 MJ, respectively. The 10 mm single-slope DNSS roof had a solar heat conversion rate of 46.1 %. This cost-effective roof system provides insights for addressing high temperatures in glass greenhouses.

Suggested Citation

  • Li, Tao & Ma, Jiangqiaoyu & Shi, Shaolong & Liu, Xiangyu & Yu, Junyong & Wang, Yanglun & Yuan, Yuan & Mao, Qianjun, 2025. "Experimental analysis of thermal insulation and heat collection performance of a novel roof based on dynamic nanofluid spectral splitting in the glass greenhouse," Renewable Energy, Elsevier, vol. 252(C).
    • Handle: RePEc:eee:renene:v:252:y:2025:i:c:s0960148125011735
    DOI: 10.1016/j.renene.2025.123511
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