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On the resistance to heat flow across soil-structure interfaces
Energy and Buildings ( IF 6.7 ) Pub Date : 2020-09-17 , DOI: 10.1016/j.enbuild.2020.110488
P.J. Bourne-Webb , J.D. de Sousa Figueira , T.M. Bodas Freitas

A number of recent publications have suggested that in order to reproduce thermal testing of energy piles, a finite value for the geo-contact thermal resistance (geo-CTR) at the soil-structure interface needs to be introduced. There is currently no guidance as to what value the geo-CTR should have. The geo-CTR will have two potential impacts in terms of the use of energy geo-structures, (i) reducing heat exchange efficiency, and (ii) increasing temperature changes and associated mechanical impacts within the geo-structure. This article sets out a new experimental method for quantifying the geo-CTR. The proposed method is based on the imposition of a heat flux through the two solid materials that form the contact. Its novelty rests with the acknowledgement that heat loss is inevitable and that the geo-CTR can be more reliably defined based on heat flow measurements at the actual contact. This concept is demonstrated via numerical modelling of a generic test set-up, where the errors induced by not accounting for heat loss, the interpolation of temperatures to the contact and the presence of the heat flow sensor were assessed. Initial test results are then presented that demonstrate how the method works. These results suggest that for a dry medium sand, while the geo-CTR is sensitive to the soil density, it is small and the effect on heat transfer is also likely to be small. Further testing will explore the relative importance of a number of factors and in particular, the soil type, on the geo-CTR.



中文翻译:

关于穿过土壤-结构界面的热流的阻力

最近的许多出版物建议,为了重现能量桩的热测试,需要引入土壤-结构界面处的地接触热阻(geo-CTR)的有限值。目前尚无关于地理点击率应具有的价值的指导。根据能源地质结构的使用情况,地理点击率将产生两个潜在的影响,(i)降低热交换效率,(ii)增加温度变化以及地质结构内的相关机械影响。本文提出了一种量化geo-CTR的新实验方法。所提出的方法基于通过形成接触的两种固体材料的热通量的施加。它的新颖性在于人们认识到热量的损失是不可避免的,并且可以基于实际接触处的热流测量结果更可靠地定义geo-CTR。该概念通过通用测试装置的数值模型得到了证明,其中评估了由于不考虑热损失,温度插值到接触点以及热流传感器的存在而引起的误差。然后提供初始测试结果,以证明该方法的工作原理。这些结果表明,对于干燥的中型砂,尽管geo-CTR对土壤密度敏感,但它很小,并且对热传递的影响也可能很小。进一步的测试将探讨Geo CTR上许多因素(尤其是土壤类型)的相对重要性。该概念通过通用测试装置的数值模型得到了证明,其中评估了由于不考虑热损失,温度插值到接触点以及热流传感器的存在而引起的误差。然后提供初始测试结果,以证明该方法的工作原理。这些结果表明,对于干燥的中型砂来说,尽管geo-CTR对土壤密度敏感,但它很小,并且对热传递的影响也可能很小。进一步的测试将探讨Geo CTR上许多因素(尤其是土壤类型)的相对重要性。该概念通过通用测试装置的数值模型得到了证明,其中评估了由于不考虑热损失,温度插值到接触点以及热流传感器的存在而引起的误差。然后提供初始测试结果,以证明该方法的工作原理。这些结果表明,对于干燥的中型砂,尽管geo-CTR对土壤密度敏感,但它很小,并且对热传递的影响也可能很小。进一步的测试将探讨Geo CTR上许多因素(尤其是土壤类型)的相对重要性。然后提供初始测试结果,以证明该方法的工作原理。这些结果表明,对于干燥的中型砂来说,尽管geo-CTR对土壤密度敏感,但它很小,并且对热传递的影响也可能很小。进一步的测试将探讨Geo CTR上许多因素(尤其是土壤类型)的相对重要性。然后提供初始测试结果,以证明该方法的工作原理。这些结果表明,对于干燥的中型砂,尽管geo-CTR对土壤密度敏感,但它很小,并且对热传递的影响也可能很小。进一步的测试将探讨Geo CTR上许多因素(尤其是土壤类型)的相对重要性。

更新日期:2020-09-18
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