Abstract

This study focuses on conducting a comprehensive assessment of the thermal characteristics of unsaturated soils, specifically in relation to temperature and moisture content. The investigation aims to analyze the influence of several key soil properties, namely specific heat capacity, heat emission coefficient, thermal conductivity, porosity, overall heat conduction coefficient and heat emission coefficient of the media. To evaluate the impact of these parameters, sensitivity analyses are conducted, and the results are presented graphically for both heat emitting and extracting modes, considering the variations in temperature and moisture content. The evaluation of equations relevant to heat and moisture flows in unsaturated soils is performed using the finite element method, specifically addressing the three primary equivalents of mass survival for the liquid and gas phases, as well as energy survival. Based on the obtained results, it can be concluded that the aforementioned parameters play a significant role in determining the thermal behavior of soils. For instance, in the emitting mode, the percentages of the temperature increase at the end of the tenth day for the highest total heat capacity and the lowest one is computed to be 13% and 9%, respectively. Also, in the extracting mode, the percentages of the temperature reduction for the highest and least total heat capacity are obtained with the values of 3% and 12%, respectively.

Graphic abstract

中文翻译：

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不饱和多孔介质在排放和提取模式下的热和湿传递的热和等温性能分析

摘要

本研究的重点是对非饱和土壤的热特性进行全面评估，特别是与温度和湿度相关的特性。该研究旨在分析几个关键土壤特性的影响，即介质的比热容、散热系数、导热系数、孔隙率、总导热系数和散热系数。为了评估这些参数的影响，进行了灵敏度分析，并考虑了温度和水分含量的变化，以图形方式呈现了散热和提取模式的结果。使用有限元方法对与非饱和土壤中的热和湿流相关的方程进行评估，专门解决液相和气相质量生存以及能量生存的三个主要等价问题。根据所获得的结果，可以得出结论，上述参数在确定土壤的热行为方面发挥着重要作用。例如，在排放模式下，计算出总热容最高和最低总热容在第十天结束时的温度升高百分比分别为13%和9%。此外，在提取模式下，获得最高和最低总热容的温度降低百分比，值分别为3%和12%。

图文摘要