To solve the problem of high cost and low strength of aerogel-based building materials, expanded perlite filled with aerogel (EPA) has been made by filling the pores in the expanded perlite with aerogel. Adding EPA to cement-based material can reduce the thermal conductivity of the cement-based material. In this study, in order to investigate the thermal conductivity of materials with different content of graded expanded perlite filled with aerogel (GEPA) and non-graded expanded perlite filled with aerogel (NEPA), the experimental and numerical studies have been carried out. The cement-based materials incorporating the EPA (CEPA) have been prepared by replacing different volumes of sand with the NEPA or GEPA, and the thermal conductivity of the CEPA has been measured using the modified transient plane source technique. Based on the law of conservation of energy and the principle of heat transfer, the thermal conductivity models of the CEPA have been developed using the Jacobi iterative method. The results show that the decreasing degree of thermal conductivity of the CEPA is positively correlated with the content of the EPA, and the performance of the GEPA is better than that of the NEPA. As the numerical and experimental results are consistent with each other, the numerical model has been proved to be reasonable and feasible for being widely used to calculate the thermal conductivity of EPA cement-based material, which can be used in sustainable buildings.

中文翻译：

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开发一个数值模型来计算含有气凝胶填充的膨胀珍珠岩的水泥基材料的传热

为了解决气凝胶基建筑材料成本高、强度低的问题，用气凝胶填充膨胀珍珠岩的孔隙，制成气凝胶填充膨胀珍珠岩（EPA）。在水泥基材料中加入EPA可以降低水泥基材料的导热系数。在这项研究中，为了研究不同含量的气凝胶填充分级膨胀珍珠岩（GEPA）和非分级气凝胶填充膨胀珍珠岩（NEPA）材料的热导率，进行了实验和数值研究。加入 EPA (CEPA) 的水泥基材料是通过用 NEPA 或 GEPA 替换不同体积的沙子制备的，CEPA 的热导率已使用改进的瞬态平面源技术进行测量。基于能量守恒定律和传热原理，使用雅可比迭代法建立了 CEPA 的热导率模型。结果表明，CEPA导热系数的降低程度与EPA的含量呈正相关，且GEPA的性能优于NEPA。由于数值和实验结果一致，该数值模型被证明是合理可行的，可广泛用于计算EPA水泥基材料的导热系数，可用于可持续建筑。结果表明，CEPA导热系数的降低程度与EPA的含量呈正相关，且GEPA的性能优于NEPA。由于数值和实验结果一致，该数值模型被证明是合理可行的，可广泛用于计算EPA水泥基材料的导热系数，可用于可持续建筑。结果表明，CEPA导热系数的降低程度与EPA的含量呈正相关，且GEPA的性能优于NEPA。由于数值和实验结果一致，该数值模型被证明是合理可行的，可广泛用于计算EPA水泥基材料的导热系数，可用于可持续建筑。