A new model and analytical solution for heat transfer in the heating section of energy tunnels considering the insulation layer

IF 6.7 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology Pub Date : 2025-04-15 DOI:10.1016/j.tust.2025.106651

Chenglong Wang , Jize Jiang , Abdelmalek Bouazza , Gangqiang Kong , Xuanming Ding

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Abstract

Energy tunnels in cold regions represent an innovative integration of ground-source heat pump systems with tunnel lining technology. Harnessing geothermal energy to offer frost protection and warmth to the tunnel lining provides the dual benefits of environmental sustainability and economic efficiency. To evaluate the heating effect of energy tunnels in cold regions, a new semicircular heat transfer model is proposed in this paper; it describes the temperature field distribution of the tunnel lining and the surrounding rock. The analytical solution of the model was obtained using the superposition principle and the Laplace transform method, and its accuracy was verified through indoor model tests. The model was then used to analyze the effects of varying insulation thicknesses and different thermal conductivities of the insulation on the temperatures of the tunnel lining and surrounding rock. The findings reveal that the zone of temperature influence, using ground heat exchangers (GHEs) system, is approximately 0.5 times the diameter of the tunnel from the heat source. Besides, reducing the thermal conductivity of the insulation layer has a similar effect to increasing its thickness, and in tunnel lining GHEs systems, both lower thermal conductivity and greater thickness of the insulation layer lead to greater heat accumulation at the lining interface. Therefore, when designing energy tunnels in cold regions, it is essential to consider the thickness and type of insulation layer according to actual conditions.

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考虑保温层的能量隧道加热段传热新模型及解析解

寒冷地区的能源隧道是地源热泵系统与隧道衬砌技术的创新结合。利用地热能为隧道衬砌提供防冻和保暖，具有环境可持续性和经济效益的双重效益。为了评价寒冷地区能量隧道的供热效果，本文提出了一种新的半圆传热模型；描述了隧道衬砌和围岩的温度场分布。利用叠加原理和拉普拉斯变换方法得到了模型的解析解，并通过室内模型试验验证了其准确性。利用该模型分析了不同保温层厚度和不同保温层导热系数对隧道衬砌和围岩温度的影响。研究结果表明，采用地下热交换器（GHEs）系统时，温度影响区约为距离热源的隧道直径的0.5倍。此外，降低保温层导热系数与增加保温层厚度具有相似的效果，在隧道衬砌GHEs系统中，保温层导热系数越低，保温层厚度越大，衬砌界面处的热量积累越大。因此，在寒冷地区设计能量隧道时，必须根据实际情况考虑保温层的厚度和类型。

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

Tunnelling and Underground Space Technology 工程技术-工程：土木

CiteScore

11.90

自引率

18.80%

发文量

454

审稿时长

10.8 months

期刊介绍： Tunnelling and Underground Space Technology is an international journal which publishes authoritative articles encompassing the development of innovative uses of underground space and the results of high quality research into improved, more cost-effective techniques for the planning, geo-investigation, design, construction, operation and maintenance of underground and earth-sheltered structures. The journal provides an effective vehicle for the improved worldwide exchange of information on developments in underground technology - and the experience gained from its use - and is strongly committed to publishing papers on the interdisciplinary aspects of creating, planning, and regulating underground space.