The shortage of fossil fuels and environmental pollution is one of the main issues of the recent century. One of the optimal ways to save energy resources is to use phase change materials for storing thermal energy. In this research, three types of ALO-PW nanocomposites were used to store solar thermal energy and use it in a solar dryer. Nanoparticles of ALO were combined in three levels of 0.5, 1 and 1.5% w / w with paraffin wax. Synthesized nano-composites were poured into steel pipes and were used to store solar energy. The results showed that by adding nanoparticles to paraffin, the thermal properties of paraffin are improved, and its thermal energy storage potential is increased. The maximum amount of absorbed thermal energy was 3393, 6109, 6445, and 6089 kJ, for composites with 0, 0.5, 1, and 1.5 (wt%) nanoparticles of ALO, respectively. Also, the results showed that the time required to reach agro-products with equilibrium moisture is reduced by increasing the amount of ALO in the nanocomposite. Considering the cost-benefit economic discussion, the use of nanocomposites with 1 wt% nano-particles of ALO is recommended.

中文翻译：

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α-AL2O3-PW纳米复合材料在农产品太阳能干燥机中储热性能的评价

化石燃料短缺和环境污染是本世纪的主要问题之一。节省能源的最佳方法之一是使用相变材料来储存热能。在这项研究中，使用三种类型的 ALO-PW 纳米复合材料来储存太阳热能并将其用于太阳能干燥器。ALO 纳米颗粒以 0.5%、1% 和 1.5% w/w 三种浓度与石蜡组合。合成的纳米复合材料被倒入钢管中，用于储存太阳能。结果表明，通过在石蜡中添加纳米颗粒，石蜡的热性能得到改善，其热储能潜力增大。对于含有 0、0.5、1 和 1.5 (wt%) ALO 纳米粒子的复合材料，吸收的热能的最大值分别为 3393、6109、6445 和 6089 kJ。此外，结果表明，通过增加纳米复合材料中 ALO 的含量，可以缩短农产品达到平衡水分所需的时间。考虑到成本效益经济讨论，建议使用含有 1 wt% ALO 纳米颗粒的纳米复合材料。