부산대학교 도서관

Utilizing highly efficient thermal insulation materials is a pivotal strategy for mitigating global energy consumption and environmental pollution. This paper conducts a theoretical analysis and investigates the effective thermal conductivity of aerogel/fiber composite mats. A theoretical model was developed, taking into account the microstructure of the composite mats and incorporating both coupled and radiative heat transfer mechanisms. To validate the model, the effective thermal conductivities of composite mats with different aerogel loading ratios were measured at various pressures and temperatures using two methods. The experimental results were then compared with the model's predictions. The results show a strong correlation between the model predictions and the experimental data, with the deviation from the model predictions remaining within 10 % for all samples at different pressures, with a minimum deviation of 0.54 %. Similarly, a minimum deviation of 1.11 % was observed at different temperatures and the model was able to maintain a low error of 1.37 % at 500 °C. When compared with other model and experimental data, the proposed model demonstrates superior accuracy and a high degree of concordance. Additionally, the study explores the contributions of coupled and radiative heat transfer to the effective thermal conductivity of the composite mats.