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

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

Renewable Energy, 2025, vol. 252, issue C

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.

Keywords: Dynamic nanofluid spectral splitter; Novel roof; Thermal environment; Heat collection performance; Glass greenhouse (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:252:y:2025:i:c:s0960148125011735

DOI: 10.1016/j.renene.2025.123511

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