Multi-factor optimization of coaxial borehole heat exchanger based on Taguchi and matrix method

IF 3.5 2区工程技术 Q3 ENERGY & FUELS

Geothermics Pub Date : 2024-11-11 DOI:10.1016/j.geothermics.2024.103193

Shimin Wang , Pengtao Wang , Jian'an Wang , Rui Liang , Jie Zhang , Ke Zhang , Jian Liu , Xingchen Lu , Shaoqiang Sui , Shengshan Bi

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引用次数: 0

Abstract

The medium-deep coaxial borehole heat exchanger (MDCBHE) utilizes mid-deep geothermal energy for building heating via a heat transfer process. The heat extraction performance of MDCBHE is influenced by multiple factors. Previous studies mainly analyzed the short-term influence of major affecting factors on a single evaluation parameter. Long-term effect of multiple factors on multiple evaluation parameters has not been well investigated. Therefore, this study constructed a full-scale three-dimensional model to study the heat extraction characteristic of MDCBHE for a geothermal energy heating system. The Taguchi method was employed to analyze the influence degree and contribution rate of 9 influencing factors on 4 assessment indexes including heat exchange per meter (Q_L−5a), heat pump unit performance coefficient (COP₋_5a), rock temperature decay rate (D_soil−5a) and buried pipe heat transfer attenuation rate (R_d−5a). The results show that the inlet water temperature has the most significant effect on Q_L−5a and COP₋_5a, with a contribution rate of 35.27 % and 53.70 %, respectively. Rock and soil density and the thermal conductivity have the greatest influence on D_soil−5a and R_d−5, with a contribution rate of 43.48 % and 39.58 %, respectively. Finally, the matrix method was used for multi-index optimization to determine the influencing factors on the total contribution rate of the four evaluation parameters. The study results can provide guidance for the location and system design of MDCBHE.

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基于田口和矩阵法的同轴井眼热交换器多因素优化技术

中深层同轴钻孔换热器（MDCBHE）通过热传递过程利用中深层地热能为建筑物供暖。MDCBHE 的取热性能受多种因素影响。以往的研究主要分析主要影响因素对单一评价参数的短期影响。而多因素对多个评价参数的长期影响尚未得到很好的研究。因此，本研究构建了一个全尺寸三维模型来研究地热供暖系统中 MDCBHE 的汲取热量特性。采用田口方法分析了 9 个影响因素对每米热交换量（QL-5a）、热泵机组性能系数（COP-5a）、岩石温度衰减率（Dsoil-5a）和埋管传热衰减率（Rd-5a）等 4 个评价指标的影响程度和贡献率。结果表明，进水温度对 QL-5a 和 COP-5a 的影响最大，贡献率分别为 35.27 % 和 53.70 %。岩石和土壤密度以及导热系数对 Dsoil-5a 和 Rd-5 的影响最大，贡献率分别为 43.48 % 和 39.58 %。最后，采用矩阵法进行多指标优化，以确定四个评价参数总贡献率的影响因素。研究结果可为 MDCBHE 的选址和系统设计提供指导。

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来源期刊

Geothermics 工程技术-地球科学综合

CiteScore

7.70

自引率

15.40%

发文量

237

审稿时长

4.5 months

期刊介绍： Geothermics is an international journal devoted to the research and development of geothermal energy. The International Board of Editors of Geothermics, which comprises specialists in the various aspects of geothermal resources, exploration and development, guarantees the balanced, comprehensive view of scientific and technological developments in this promising energy field. It promulgates the state of the art and science of geothermal energy, its exploration and exploitation through a regular exchange of information from all parts of the world. The journal publishes articles dealing with the theory, exploration techniques and all aspects of the utilization of geothermal resources. Geothermics serves as the scientific house, or exchange medium, through which the growing community of geothermal specialists can provide and receive information.