Assessment of impregnating phase change materials into lightweight aggregates for development of thermal energy storage aggregate composites
Assessment of impregnating phase change materials into lightweight aggregates for development of thermal energy storage aggregate composites
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DOI：
10.1016/j.conbuildmat.2021.124683
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发表时间：
2021-09-04
影响因子：
7.4
通讯作者：
Singh, Rao Martand
中科院分区：
文献类型：
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作者：
Sani, Abubakar Kawuwa;Olawoore, Isaac Olaniyi;Singh, Rao Martand
本研究评估了将相变材料 (PCM) 浸渍/包裹到轻质骨料 (LWA) 中用于工程应用的可行性。对四种植物基 PCM（PCM1 - 未精炼棕榈油、PCM2 - 未精炼乳木果油、PCM3 - 未精炼椰子油和 PCM4 - Crodatherm PCM）进行了材料层面的研究。同样，研究中使用了两种类型的 LWA，即粉煤灰骨料 (FA) 和玻璃骨料 (GA)。这些骨料是建筑和拆除活动中产生的粉煤灰和玻璃废物的副产品。产生的废物被回收成各种形式，以减少/消除垃圾填埋处理的需要，从而降低碳排放，并最大限度地减少建筑行业内的资源开采活动。在本研究的初步调查中，发现 PCM4 是所有 PCM 中能效最高的。 PCM4 的热能储存值为 33.5 kJ/kg/磅，而 PCM1、PCM2 和 PCM3 的热能储存值分别为 21.43 kJ/kg/磅、27.6 kJ/kg/磅和 20.71 kJ/kg/磅。采用 PCM4 并用于浸渍粉碎的 FA 和 GA LWA。通过真空浸渍技术观察到 FA 和 GA 的最大吸收容量约为 18.56% 和 30.66%，而使用简单浸泡方法测量的 FA 和 GA 的最大吸收容量分别为 5.78% 和 12.86%。为了防止泄漏并避免骨料聚结，PCM 浸渍的 LWA 首先涂有底漆环氧树脂，然后涂上石墨粉。采用两层涂层来获得耐用的产品，该产品能够承受建筑施工或行业基础设施开发过程中预期的磨损力（双层和单层涂层的磨损值为 6% 和 21%）、加热和冷却温度、盐侵蚀以及热负荷和盐侵蚀的组合。
This study assesses the feasibility of the impregnation/encasement of phase change materials (PCM) into lightweight aggregates (LWAs) for engineering applications. Four types of plant-based PCMs (PCM1 - unrefined palm oil, PCM2 - unrefined shea butter, PCM3 - unrefined coconut oil, and PCM4 - Crodatherm PCM) are investigated at material level. Similarly, two types of LWAs are used in the investigations, namely, fly-ash aggregates (FA) and glass aggregates (GA). The aggregates are by-products of the fly-ash and glass wastes generated from the construction and demolition activities. The wastes generated are recycled into various forms to reduce/ eliminate the need for landfill disposal, thereby, lowering carbon-based emissions, and minimise resource extraction activities within the construction sector. In the initial investigations of this study, PCM4 was found to be the most energy efficient of all the PCMs. PCM4 had a thermal energy storage value of 33.5 kJ/kg per pound sterling () pound in comparison to 21.43 kJ/kg/ pound, 27.6 kJ/kg/ pound and 20.71 kJ/kg/ pound for PCM1, PCM2 and PCM3, respectively. PCM4 was adopted and used for impregnation into the pulverised FA and GA LWAs. Maximum absorption capacities of about 18.56% and 30.66% for the FAs and GAs were observed via vacuum impregnation technique in comparison to 5.78% and 12.86% measured using simple immersion method for the FAs and GAs, respectively. To prevent leakage and avoid coalescing of the aggregates, the PCM impregnated LWAs were coated, first, with primer epoxy resin, followed by graphite powder. Two layers of coating were applied to arrive at a durable product that can withstand abrasive forces (abrasive value of 6 and 21% for the double and single coating), heating and cooling temperatures, salt attack and a combination of thermal load and salt attack that are expected during buildings' construction or infrastructural development in the industry.