A multi-parameter estimation of layered rock-soil thermal properties of borehole heat exchanger in a stratified subsurface

作     者：Zhang, Changxing Xu, Chong Yu, Xiaoxi Lu, Jiahui Liu, Yufeng Sun, Shicai 

作者机构：Shandong Univ Sci & Technol Coll Civil Engn & Architecture Qingdao 266590 Peoples R China Minist Nat Resources Key Lab Geol Safety Coastal Urban Underground Spac Qingdao 266101 Peoples R China Jinan Municipal Bur Housing & Urban Rural Dev Jinan 250102 Peoples R China 

出 版 物：《RENEWABLE ENERGY》 (再生能源)

年 卷 期：2024年第232卷

核心收录：

学科分类：0820[工学-石油与天然气工程] 080703[工学-动力机械及工程] 08[工学] 0807[工学-动力工程及工程热物理] 

基　　金：Open Foundation of Key Laboratory of Geological Safety of Coastal Urban Underground Space, Ministry of Natural Resources [BHKF2023Y01] Natural Science Foundation of Shandong Province [ZR2020ME187] Science and Technology Project of Silk Road Economic Belt Innovation-Driven Development Zone Wu-Chang-Shi National Innovation Zone [2022LQ03009] 

主　　题：Multi-parameter estimation Bat algorithm Geological stratification Thermal response test Borehole heat exchanger Nomenclature 

摘      要：The high initial investment of borehole heat exchanger (BHE) prevents the popularization and application of ground-coupled heat pump system (GCHPs). As the premise of designing BHE, ground thermal properties are usually obtained using thermal response test (TRT), and parameter estimation method are applied based on homogeneous BHE model independent of geological stratification. In this paper, a multi-parameter estimation method using Bat algorithm (BA) is firstly proposed to obtain the layered rock-soil thermal properties based on the numerical layered BHE model, considering the characteristics of geological stratification. Then, a TRT experimental platform of three-layer BHE is developed to measure thermal responses of different stratified subsurface. Finally, the six thermal properties are obtained by the proposed multi-parameter estimation method based on BA, and their accuracy is validated using the experimental data in TRT. The five temperatures obtained from the numerical layered BHE model using the estimated results are compared with the corresponding experimental data, the results show that the maximum error of the inlet and outlet water temperatures of the BHE is respectively 3.32 % and 3.59 %, and it is 3.31 %, 2.38 % and 2.7 % for the coarse sand, fine sand and brown soil, respectively.