To enhance the efficiency and cost-effectiveness of heating, air-conditioning, and solid waste recycling in buildings, this work proposed the solid waste semi-coke ash as skeleton material and the sodium carbonate as phase-change material to produce shape-stable phase-change composites using the cold compression-hot sintering method for building thermal energy storage. Eight shape-stable phase-change composites were prepared and the detailed chemical compatibility, thermal property, structural and mechanical performance, and micromorphology were investigated by X-ray diffraction, differential scanning calorimetry, laser flash analysis, N adsorption and desorption method, constant speed pressurization method, and scanning electron microscopy. Results demonstrated that semi-coke ash is suitable with sodium carbonate for fabricating shape-stable phase-change composites. The optimal mass ratio of semi-coke ash to NaCO powder for sample CC3 was determined to be 52.5:47.5. This particular sample demonstrated a thermal energy storage density of 961.58 J/g and a maximum thermal conductivity of 1.306 W/(m ∙ K). It also exhibited excellent chemical compatibility between its components. Furthermore, sample CC3 displayed a mechanical strength of 23.57 MPa, with elements evenly distributed throughout. Importantly, CO emission from the production of sample CC3 was significantly low, indicating great potential for commercialization.

中文翻译：

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半焦灰渣低碳稳形相变复合材料用于建筑蓄热

为了提高建筑供暖、空调和固体废物回收的效率和成本效益，本工作提出以固体废物半焦灰为骨架材料，以碳酸钠为相变材料，产生形状稳定的相-使用冷压缩-热烧结方法改变复合材料用于建筑热能储存。制备了八种形状稳定的相变复合材料，并通过X射线衍射、差示扫描量热法、激光闪光分析、N吸脱附法、恒速研究了其详细的化学相容性、热性能、结构和力学性能以及微观形貌。加压法、扫描电子显微镜法。结果表明，半焦灰适合与碳酸钠一起制备形状稳定的相变复合材料。确定样品CC3的半焦灰分与NaCO粉的最佳质量比为52.5:47.5。该特殊样品的热能存储密度为 961.58 J/g，最大导热率为 1.306 W/(m ∙ K)。它的成分之间还表现出优异的化学相容性。此外，样品 CC3 的机械强度为 23.57 MPa，元素分布均匀。重要的是，CC3 样品生产过程中的 CO 排放量显着较低，表明商业化潜力巨大。