https://doi.org/10.1140/epjp/s13360-024-04914-9
Regular Article
Thermal and isothermal performance analyses for heat and moisture transfer in unsaturated porous media in emitting and extracting modes
Renewable Energies and Environmental Department, Faculty of New Science and Technologies, University of Tehran, Tehran, Iran
Received:
17
November
2022
Accepted:
18
January
2024
Published online:
5
April
2024
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.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
