Numerical study of building heating potential from deep-buried pipes under dynamic loads: A case study of Xi'an, China

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2025-06-09 DOI:10.1016/j.csite.2025.106482

Chao Jiang , Chao Li , Xiaogang Zhang , Jinxing Ma , Jiachen Wang , Jiale Wu

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Abstract

The utilization of geothermal energy through deep ground heat exchangers (DGHE) primarily serves building heating purposes, posing challenges in understanding the heat transfer characteristic of buried pipes under dynamic loads. Based on practical DGHE engineering in Xi'an, China, this study establishes a three-dimensional full-size numerical model coupling the inside and outside of the pipes. It examines the heat transfer properties of DGHE when subjected to varying dynamic thermal loads and investigates how they change with different dynamic load clipping rates. A novel assessment approach for determining the heating capacity of DGHE systems in buildings is introduced. The study demonstrates a direct correlation between the building heating area (A) and the minimum inlet water temperature (T_in-Min) during the DGHE heating phase. It identifies an optimal dynamic load peak-clipping rate of around 40 %. Once this rate is set, the heating potential of DGHE in specific geological conditions, ground temperatures, and pipe sizes can be forecasted using the relationship between T_in-Min and A. This research offers valuable insights for predicting the heating potential of DGHE, aiding in the scientific planning and execution of relevant engineering projects.

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动荷载作用下建筑深埋管道供热势数值研究——以西安为例

地热能通过深埋地下换热器（DGHE）利用，主要用于建筑供暖目的，这对了解埋地管道在动态载荷下的传热特性提出了挑战。本文结合西安DGHE工程实际，建立了管道内外耦合的三维全尺寸数值模型。它检查了DGHE的传热特性，当受到不同的动态热负荷，并调查他们如何改变不同的动态负载裁剪率。介绍了一种新的确定建筑物DGHE系统供热能力的评估方法。研究表明，在DGHE供暖阶段，建筑供暖面积(a)与最低进水温度（Tin-Min）之间存在直接相关关系。它确定了一个最佳的动态负载削峰率约为40%。确定该速率后，可以利用Tin-Min与a的关系预测特定地质条件、地温和管道尺寸下的热电联产热势，为热电联产热势预测提供有价值的见解，有助于相关工程项目的科学规划和实施。

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

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.