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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Numerical evaluation on the effects of soil freezing on underground temperature variations of soil around ground heat exchangers
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Numerical evaluation on the effects of soil freezing on underground temperature variations of soil around ground heat exchangers

机译：土壤冻结对地面换热器周围土壤地下温度变化影响的数值评估

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摘要

Freezing of soil around ground heat exchangers (GHE) is a common problem for a ground coupled heat pump (GCHP) operated in the cold district, which will affect the underground soil temperature variation and its heat transfer performance. In this paper, a two-dimensional model for heat transfer with freezing-thawing phase change in soil around GHE is developed and numerically analyzed by apparent heat capacity method. The influences of soil freezing, soil water content, and soil type on soil temperature variations and long term underground thermal imbalance of GCHP with GHE array are investigated. The results indicate that the soil freezing can lessen the soil temperature drop and thus increase the temperature difference between the fluid inside GHE and far-field soil. This helps to shorten the GHE design length and cut down the initial system cost. The soil freezing characteristics are mostly affected by the soil thermal diffusivity. From the view of the ability in delaying soil temperature drop, the sandstone is preferable to sand, and sand is better than clay. Additionally, increasing water content can reduce the drop degree and speed of the soil temperature, as well as, accordingly alleviate the underground thermal imbalance of GCHP. (C) 2014 Elsevier Ltd. All rights reserved.
机译：对于在寒冷地区运行的地面耦合热泵（GCHP）而言，地面热交换器（GHE）周围的土壤冻结是一个常见问题，它将影响地下土壤温度变化及其传热性能。本文建立了一个二维的GHE周围土壤冻融相变传热模型，并通过表观热容法进行了数值分析。研究了土壤冻结，土壤含水量和土壤类型对GHE阵列GCHP土壤温度变化和长期地下热失衡的影响。结果表明，土壤冻结可以减轻土壤温度的下降，从而增加GHE内部流体与远场土壤之间的温差。这有助于缩短GHE设计长度并降低初始系统成本。土壤的冻结特性主要受土壤热扩散率的影响。从延缓土壤温度下降的能力来看，砂岩优于砂土，而砂土优于粘土。另外，增加水含量可以降低土壤温度的下降程度和速度，并因此减轻GCHP的地下热失衡。 （C）2014 Elsevier Ltd.保留所有权利。

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