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

IF 9 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy Pub Date : 2025-05-22 DOI:10.1016/j.renene.2025.123511

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

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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.

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基于动态纳米流体光谱分裂的新型玻璃温室屋顶隔热集热性能实验分析

为了降低玻璃温室夏季室内高温，设计了动态纳米流体分光器（DNSS）屋顶。该系统使用一种吸收热量的纳米流体，通过外部循环装置收集热量。它有助于冷却温室并利用太阳能。制备了一种稳定的CWO@TiO2复合纳米流体，其近红外屏蔽率为77.08%，可见光透过率为62.41%。采用三种不同厚度的DNSS屋顶系统进行了隔热和集热测试。与10毫米空气屋顶相比，10毫米DNSS屋顶的冷却效果为16.90°C，集热率为732 W/m2。5 mm、10 mm和15 mm屋面的平均降温幅度分别为8.27℃、11.24℃和9.27℃，日吸热量分别为81.48、95.66和97.33 MJ。10mm单坡DNSS屋顶的太阳能热转换率为46.1%。这种具有成本效益的屋顶系统为解决玻璃温室的高温问题提供了见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Renewable Energy 工程技术-能源与燃料

CiteScore

18.40

自引率

9.20%

发文量

1955

审稿时长

6.6 months

期刊介绍： Renewable Energy journal is dedicated to advancing knowledge and disseminating insights on various topics and technologies within renewable energy systems and components. Our mission is to support researchers, engineers, economists, manufacturers, NGOs, associations, and societies in staying updated on new developments in their respective fields and applying alternative energy solutions to current practices. As an international, multidisciplinary journal in renewable energy engineering and research, we strive to be a premier peer-reviewed platform and a trusted source of original research and reviews in the field of renewable energy. Join us in our endeavor to drive innovation and progress in sustainable energy solutions.