Stepwise multi-objective framework for decoupling multi-parameter estimation of ground heat exchangers

IF 3.5 2区工程技术 Q3 ENERGY & FUELS

Geothermics Pub Date : 2025-01-17 DOI:10.1016/j.geothermics.2025.103249

Min Li , Haoxin Peng

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引用次数: 0

Abstract

It is a great challenge to estimate multiple parameters of ground heat exchangers (GHEs) from a thermal response test (TRT) with high reliability. This study proposed a stepwise framework involving the lexicographic multi-objective optimization method to increase the identifiability of multi-parameter estimation of GHEs. Three ideas constitute the foundation of the framework: 1) using a temperature derivative objective-function to complement the temperature objective function, 2) using the lexicographic method for solving the involved multi-objective minimization problem, 3) using an analytical short-time solution for addressing the time-varying features of parameter sensitivity. This framework was illustrated by two variant algorithms for five-parameter estimation (four thermal properties plus borehole thermal resistance). The two variant algorithms were validated by an independent sandbox experiment, and the results show that these algorithms yield estimates for borehole thermal resistance, soil thermal conductivity, grout thermal diffusivity, grout thermal conductivity, and soil thermal diffusivity with relative errors smaller than 2.0 %, 4.0 %, 14 %, 20 %, and 36 %, respectively.

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地热交换器多参数逐步解耦多目标框架

从高可靠性的热响应测试（TRT）中估计地埋管的多个参数是一个很大的挑战。为了提高GHEs多参数估计的可辨识性，本研究提出了一个包含词典学多目标优化方法的逐步框架。三种思想构成了框架的基础：1)使用温度导数目标函数来补充温度目标函数，2)使用字典法来解决所涉及的多目标最小化问题，3)使用解析短时间解来处理参数灵敏度的时变特征。该框架通过两种不同的五参数估计算法（四种热性能加上井眼热阻）来说明。通过独立沙盒实验对两种算法进行了验证，结果表明，这两种算法对井眼热阻、土壤导热系数、浆液导热系数、浆液导热系数和土壤导热系数的估计相对误差分别小于2.0%、4.0%、14%、20%和36%。

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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.