可再生能源2025，Vol.43Issue(5)：610-619,10.
分层岩土热物性对U型中深层地埋管传热性能的影响研究
Study on the influence of stratified ground thermophysical properties on the heat transfer performance of U-bend deep borehole heat exchanger
摘要
Abstract
U-bend Deep Borehole Heat Exchanger(UDBHE)has attracted much attention because it can effectively exploit deep geothermal energy and has high heat transfer performance.The thermophysical properties of medium-deep ground generally change with depth,but there is a lack of in-depth study on the influence of thermophysical properties of stratified ground on the heat transfer performance of U-bend deep borehole heat exchanger.Based on the UDBHE semi-analytical heat transfer model established by the authors,the influence of thermophysical properties(thermal conductivity and volumetric heat capacity)of stratified ground on the heat transfer performance of UDBHE is studied.The results show that the thermal conductivity of each layer of ground has a great influence on the heat transfer performance of UDBHE,while the volumetric heat capacity of ground in each layer also has a certain influence,and the influence increases with the increase of ground layer depth.With the increase of time,the influence of ground thermal conductivity on the heat transfer performance of UDBHE gradually increases,while the influence of ground volumetric heat capacity on the heat transfer performance of UDBHE is basically unchanged.By keeping the weighted average values of the thermal conductivities of all ground layers constant,the heterogeneity of ground thermal conductivity has a great influence on the heat transfer performance of UDBHE,and the larger degree of heterogeneity of ground thermal conductivity would promote the heat transfer performance of UDBHE,otherwise it will inhibit the heat transfer performance of UDBHE.Similarly,the heterogeneity of volumetric heat capacity of ground also has a certain influence on the heat transfer performance of UDBHE,but its influence changes slightly with time.The research results provide important reference value for UDBHE performance prediction and optimization.关键词
U型中深层地埋管换热器/分层岩土热物性/传热性能/热导率/体积比热容Key words
U-bend deep borehole heat exchanger/stratified ground thermophysical properties/heat transfer performance/thermal conductivity/volumetric heat capacity分类
能源与动力引用本文复制引用
孙婉玉,蒋天茁,付强,王昌龙..分层岩土热物性对U型中深层地埋管传热性能的影响研究[J].可再生能源,2025,43(5):610-619,10.基金项目
安徽省自然科学基金(1808085QE178). （1808085QE178）
