流体机械2025，Vol.53Issue(2)：65-73,9.DOI:10.3969/j.issn.1005-0329.2025.02.009
热储层渗流对中深井地埋管系统换热性能及地层温度恢复的影响
The influence of thermal reservoir seepage on the heat exchange performance and stratum temperature recovery in medium-deep borehole exchanger systems
摘要
Abstract
In order to investigate the impact of thermal reservoir seepage on the heat transfer characteristics of medium-deep borehole heat exchanger(MDBHE),a transient heat transfer model for both the inside and outside of the borehole was established.The finite volume method(FVM)is employed to calculate the transient temperature in different regions inside and outside the borehole,and the results were compared with field test data to validate the accuracy of the proposed model and algorithm.The results show that compared with the condition without geothermal water seepage,the scenario with a thermal reservoir thickness of 400 m and a seepage velocity of 10×10-7 m/s showed an increase of 5.5℃in the temperature difference ΔT between the inlet and outlet of the pipe and a 16.22%improvement in the average energy efficiency coefficient(E).Additionally,when the seepage velocity is 10×10-7 m/s and the thermal reservoir thickness increases from 50 to 600 m,the average heat transfer power per unit buried depth(q)during the heating period rises by 81.92%.Furthermore,with a reservoir thickness of 600 m,the stratum temperature recovery rate during intermittent periods reaches 99.43%.The calculations demonstrated that as the thermal reservoir seepage velocity and the thickness of the thermal reservoir increase,there is a corresponding enhancement in the heat exchange performance of the MDBHE and in the temperature recovery rate of the stratum.These findings provide theoretical support for the efficient operation and practical engineering application of MDBHE in complex geological conditions.关键词
中深井地埋管/富水型热储层/传热/数值计算/渗流过程/换热性能Key words
medium-deep borehole exchanger/water-rich geothermal reservoirs/heat transfer/numerical calculation/seepage process/heat exchange performance分类
能源与动力引用本文复制引用
谷伟,丛培德,李博,马玖辰..热储层渗流对中深井地埋管系统换热性能及地层温度恢复的影响[J].流体机械,2025,53(2):65-73,9.基金项目
国家自然科学基金项目(41402228) （41402228）
天津市自然科学基金企业科技特派员项目(19JCTPJC48100) （19JCTPJC48100）
