Development of novel form-stable PCM-biochar composites and detailed characterization of their morphological, chemical and thermal properties
Development of novel form-stable PCM-biochar composites and detailed characterization of their morphological, chemical and thermal properties
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DOI：
10.1016/j.est.2024.110995
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发表时间：
2024-04
影响因子：
9.4
通讯作者：
Dudul Das;Ondrej Masek;Manosh C. Paul
中科院分区：
文献类型：
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作者：
Dudul Das;Ondrej Masek;Manosh C. Paul
用相变材料储存热量具有几种现代应用的潜力，例如建筑热调节、等温太阳能干燥、电子冷却等。然而，为了适当地结合潜热能量储存系统，需要解决这些材料的泄漏和低热导率的挑战。在这个方向上，已经探索了来源于丰富的生物质原料的生物炭，以开发形状稳定的、环境相容的能量存储材料。生物炭来源于小麦秸秆和软木，并分析了它们的表面结构，并用于制备形式稳定的相变材料。与麦草相比，软木生物炭具有上级多孔结构，比表面积为441 m2/g。将生物炭和相变材料Rubitherm 28（RT 28）以各种重量%混合并测试泄漏。软木生物炭和RT 28的复合材料具有最低的渗漏率。开发的绿色相变-生物复合材料具有最小的泄漏已彻底评估其化学和热性能。已经发现RT 28、软木生物炭复合物和麦草生物炭复合物的熔化潜热分别为228.6J/g、132.3J/g和51.6J/g。复合材料的热导率也高于RT 28。热循环可靠性适用于热存储应用，因为在200次循环后观察到的热性能变化最小。经过200次循环后，新复合材料和老化复合材料的熔化焓分别为136.6 J/g和132.42 J/g。具有最小泄漏和高导热率的复合材料可能会彻底改变低温潜热存储领域。在这项工作中合成的形状稳定的相变-生物复合材料的性质使其适合于在光伏模块、电子设备和建筑物的热管理领域中的应用。
Storing heat with phase change materials has the potential for several modern-day applications such as building thermal regulation, isothermal solar drying, electronic cooling, etc. However, to suitably incorporate latent heat energy storage systems, the challenges of leakage and low thermal conductivity of these materials need to be addressed. In this direction, biochar derived from abundantly available biomass feedstocks has been explored to develop form-stable, environmentally compatible energy storage materials. Biochar has been derived from wheat straw and softwood and has been analysed for their surface structure and utilised in the preparation of form-stable phase change material. The biochar derived from softwood was found to have a superior porous structure with a surface area of 441 m2/g compared to wheat straw. Biochar and phase change material Rubitherm 28 (RT28) were blended at various wt% and tested for leakage. The composite with 50 wt% of softwood biochar and RT28 had the lowest leakage rate. The developed green phase change-bio composite with minimum leakage has been thoroughly evaluated for its chemical and thermal properties. The latent heat of fusion has been found to be 228.6 J/g, 132.3 J/g and 51.6 J/g, for the RT28, softwood biochar composite, and wheat straw biochar composite respectively. Thermal conductivity was also higher for the composites than that of RT28. The thermal cycling reliability is suitable for thermal storage applications as there is a minimal alteration in the thermal properties observed after 200 cycles. The melting enthalpy of the new and aged composites after 200 cycles has been found to be 136.6 J/g and 132.42 J/g, respectively. The composite with minimal leakage and high thermal conductivity can potentially revolutionise the area of low temperature latent heat storage. The properties of the form-stable phase change-bio composite synthesised in this work make it suitable for application in the field of thermal management of photovoltaic modules, electronic devices, and buildings.