Analysis of heat exchange performance of deep coaxial buried pipe heat exchangers based on Fluent
WANG Hao
GUAN Zhengrong
WANG Fei
WANG Lin
Abstract：The high-efficiency heat transfer characteristics of coaxial buried tube heat exchangers are studied.A coupling heat transfer model between a three-tube concentric deep coaxial buried tube heat exchanger and the rock and soil of the formation is established.The influence of design parameters such as circulation flow rate and thermal conductivity of backfill material on its heat exchange performance is analyzed from both physical and numerical model perspectives.The Fluent software is utilized to conduct fluid heat transfer analysis and numerical simulation verification for the model of the medium-deep coaxial buried tubular heat exchanger.The results show that with the continuous increase of the circulating flow rate,the outlet temperature of the ground heat exchanger keeps decreasing,but the heat retrieval performance of the ground heat exchanger keeps improving.Increasing the thermal conductivity of the backfill material can enhance the heat exchange performance of the deep and medium-depth coaxial buried tube heat exchanger.
Keywords：deep geothermal energythree tubes in unisonmedium and deep coaxial buried pipe heat exchangerheat exchange performance
Publication Date：2025-07-25
Online Publishing Date：2025-09-15(First online date of this platform, not the publication date of the document)
Pages：5( 47-51 )