Thermal recovery test for determining the thermal conductivity of the soil

IF 1.1 4区工程技术 Q4 THERMODYNAMICS

Thermal Science Pub Date : 2023-01-01 DOI:10.2298/tsci230825223v

Marija Vasilev, Milos Banjac

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Abstract

This paper presents a new in-situ experimental procedure for determining a thermal conductivity of soil, as one of the thermophysical properties necessary for dimensioning vertical buried heat exchangers of geothermal heat pumps. The proposed method, called the Thermal Recovery Test, is based on the assumption that there is a direct analogy between the hydrodynamic process of filling (recovery) the well with water from a porous aquifer after its partial or complete discharging and the process of establishment of thermal equilibrium in an infinite medium previously disturbed by a line heat sink (source). Apart from presentation the theoretical background of these two phenomena, the display of the identical theoretical logarithmic character of the change of hydrostatic pressure and soil temperature, description of the experimental procedure, the experimental results of three performed experiments are also presented. Additionally, results for the experimentally obtained values of the thermal conductivity of the soil are compared with those obtained from the Thermal Response Test, and the advantages and drawbacks of the new Thermal Recovery Test method are analyzed.

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测定土壤导热性的热恢复试验

本文提出了一种新的原位实验方法来测定土壤的导热系数，土壤导热系数是确定地热热泵垂直埋地换热器尺寸所必需的热物理性质之一。所提出的方法称为热恢复试验，它是基于这样一个假设，即在多孔含水层部分或完全排放后向井中注水(恢复)的水动力过程与在之前被线热沉(源)扰动的无限介质中建立热平衡的过程之间存在直接类比。介绍了这两种现象的理论背景，展示了静水压力和土壤温度变化的相同的理论对数特征，描述了实验过程，并给出了三次实验的结果。并将实验得到的土壤导热系数值与热响应试验结果进行了比较，分析了热恢复试验方法的优缺点。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Thermal Science 工程技术-热力学

CiteScore

2.70

自引率

29.40%

发文量

399

审稿时长

5 months

期刊介绍： The main aims of Thermal Science to publish papers giving results of the fundamental and applied research in different, but closely connected fields: fluid mechanics (mainly turbulent flows), heat transfer, mass transfer, combustion and chemical processes in single, and specifically in multi-phase and multi-component flows in high-temperature chemically reacting flows processes present in thermal engineering, energy generating or consuming equipment, process and chemical engineering equipment and devices, ecological engineering, The important characteristic of the journal is the orientation to the fundamental results of the investigations of different physical and chemical processes, always jointly present in real conditions, and their mutual influence. To publish papers written by experts from different fields: mechanical engineering, chemical engineering, fluid dynamics, thermodynamics and related fields. To inform international scientific community about the recent, and most prominent fundamental results achieved in the South-East European region, and particularly in Serbia, and - vice versa - to inform the scientific community from South-East European Region about recent fundamental and applied scientific achievements in developed countries, serving as a basis for technology development. To achieve international standards of the published papers, by the engagement of experts from different countries in the International Advisory board.