Long-term Thermo-hydraulic Response of the Shallow Subsurface soil in the Vicinity of a Buried Horizontal Heat Source
Long-term Thermo-hydraulic Response of the Shallow Subsurface soil in the Vicinity of a Buried Horizontal Heat Source
复制标题
埋藏水平热源附近浅层地下土壤的长期热水力响应
DOI：
10.1016/j.ijheatmasstransfer.2021.122120
复制
发表时间：
2022
影响因子：
5.2
通讯作者：
Ghasemi-Fare, Omid
中科院分区：
文献类型：
--
作者：
Tamizdoust, Mohammadreza Mir;Ghasemi-Fare, Omid
在浅层地下和埋地热源附近的传热和传质的研究往往是基于相当简单的假设，如平衡相变（EPC），忽略膜流和吸附的土壤-水特性。在这项研究中，一个完全耦合的非等温多相流模型的开发，利用非平衡相变（NEPC）的方法。首先，EPC和NEPC方法的性能进行了评估和验证对现场实验数据。本研究的第二个也是主要目的是分析靠近埋置水平热源（例如，电缆）在真实的气象条件下一年。数值结果表明，NEPC模型在预测土壤-大气边界附近土壤体积含水量时具有较高的鲁棒性。然而，NEPC和EPC方法估计相同的温度变化的土壤。在沉淀的情况下（例如，对于降雨量（降雨量），NEPC模型预测深层土壤的饱和度较高，其中渗透水达到地表以下150 cm，而在EPC模型中，渗透水几乎没有达到100 cm深度。靠近热源的水分含量的增加促进了介质中的热传递，从而导致靠近热源的土壤温度降低40%至50%。为了评估埋地电缆的性能和热容量，需要准确预测介质中土壤的含水量。此外，加热/冷却循环有助于逐渐干燥加热器附近的土壤，直到达到水力平衡条件。
Heat and mass transfer in the shallow subsurface and in the vicinity of buried heat sources has been often studied based on rather simplifying assumptions, such as the Equilibrium Phase Change (EPC), disregarding film flow, and adsorptive soil-water characteristics. In this study, a fully coupled non-isothermal multiphase flow model is developed that utilizes the Non-equilibrium Phase Change (NEPC) approach. First, the performance of the EPC and NEPC approaches is assessed and validated against the in-field experimental data. The second and main objective of this study is to analyze the thermo-hydraulic response of granular soil close to a buried horizontal heat source (e.g., electrical cables) for one year under real meteorological conditions. Numerical results indicate that the NEPC model has higher robustness in predicting the volumetric water content in the soil close to the soil-atmospheric boundary. However, NEPC and EPC approaches estimate the same temperature variations in the soil. In the case of precipitation (e.g., rainfall), the NEPC model predicts higher degrees of saturation in deeper soil in which the infiltrated water reaches 150 cm below the surface, while, in the EPC model, the infiltrated water barely reaches the 100 cm depth. The increase in moisture content close to the heat source facilitates the heat transfer in the medium and thus results in a 40% to 50% reduction in soil temperature close to the heat source. An accurate prediction of the soil moisture content in the medium is needed to evaluate the performance and thermal capacity of buried electrical cables. Furthermore, the heating/cooling cycles contribute to gradually drying the soil in the vicinity of the heater until the hydraulically equilibrated condition is attained.
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