From waste to value: Utilising waste foundry sand in thermal energy storage as a matrix material in composites
From waste to value: Utilising waste foundry sand in thermal energy storage as a matrix material in composites
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DOI：
10.1016/j.solener.2023.112294
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发表时间：
2024-01
期刊：
影响因子：
6.7
通讯作者：
A. Anagnostopoulos;M. Elena Navarro;Shivangi Sharma;Abdalqader Ahmad;Yelaman Maksum;Yulong Ding
中科院分区：
文献类型：
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作者：
A. Anagnostopoulos;M. Elena Navarro;Shivangi Sharma;Abdalqader Ahmad;Yelaman Maksum;Yulong Ding
铸造废砂 (WFS) 是铸造行业的副产品，由于垃圾填埋场维护成本和更严格的环境法规，造成了日益严重的经济和环境问题。这项研究提出了一种将 WFS 作为热能储存材料的新颖解决方案。该方法涉及将 WFS 与 NaNO3 和专有添加剂 X 混合，以制造复合相变材料 (CPCM)。研究发现，CPCM 在高达 400 °C 的温度下结构稳定，并且获得了 NaNO3:WFS:X = 0.6:0.3:0.1 质量比的最佳组成。该组合物的储能密度为 628 ± 27 kJ/kg，在 25–400 °C 的温度范围内平均导热率为 1.38 W/mK。与 NaNO3 相比，CPCM 还表现出良好的机械强度和较低的热膨胀系数。目前，只有一小部分 WFS 被回收，最常见的是建筑应用。本研究中提出的 CPCM 具有在废热回收应用中进行中高温储热的潜力，为升级改造 WFS 提供了可持续的解决方案。
Waste foundry sand (WFS) is a by-product of the casting industry, which poses increasing economic and environmental issues due to the costs associated with landfill maintenance and stricter environmental regulations. This study proposes a novel solution for WFS as a material for thermal energy storage. The approach involves blending WFS with NaNO3and a proprietary additive, X, to fabricate a composite phase change material (CPCM). The CPCM is found to be structurally stable up to 400 °C, and an optimal composition with a mass ratio of NaNO3:WFS:X = 0.6:0.3:0.1 is achieved. This composition yields an energy storage density of 628 ± 27 kJ/kg, and an average thermal conductivity of 1.38 W/mK over the temperature range of 25–400 °C. The CPCM also exhibits good mechanical strength and a low coefficient of thermal expansion compared to NaNO3. Currently, only a small portion of WFS is recycled, most commonly in building applications. The CPCM presented in this study has the potential for medium-to-high temperature heat storage in waste heat recovery applications, offering a sustainable solution for upcycling WFS.