可再生能源2025，Vol.43Issue(5)：620-628,9.
渗流条件下双U型地埋管换热器换热特性的数值研究
Numerical study on the heat transfer characteristics of double U-tube ground heat exchanger under seepage condition
摘要
Abstract
Based on the porous medium model,a three-dimensional double U-tube heat exchanger heat transfer model considering groundwater seepage was established,and the effects of seepage velocity and tube flow velocity on the temperature field of the heat exchanger were investigated by numerical simulation method.Moreover,the comparison of heat transfer performance was completed for the round tube(the cross-sectional aspect ratio ζ=1)with the flat-oval tube(ζ is 0.54,0.44,0.34,respectively).The results show that increasing the seepage velocity and the tube flow velocity can increase the heat transfer capacity of the tube.When ζ decreases,the heat transfer capacity increases more in the inlet tube than the outlet tube,and more in the vertically arranged tube than the horizontally arranged one.Reducing the aspect ratio of the tube cross-section can reduce the thermal resistance of the borehole and improve the heat exchange capacity of the tube,but it will also make the pressure drop of the tube increase,and the thermal short-circuit loss is increase.When v=1.50×10-5 m/s,u=1.3 m/s,compared to the round tube,the heat exchange capacity of the flat-oval tube with ζ=0.34 increases by 11.4％,the thermal resistance of the borehole decreases by 20.52％,and the pressure drop increases by 24.32％.关键词
双U型地埋管/渗流/扁管/圆管/数值模拟Key words
double U-tube/seepage/flat-oval tube/round tube/numerical simulation分类
能源与动力引用本文复制引用
陈实,阴继翔,乔鹏飞,朱建利..渗流条件下双U型地埋管换热器换热特性的数值研究[J].可再生能源,2025,43(5):620-628,9.基金项目
国家自然科学基金资助项目(52278118) （52278118）
山西省自然科学基金(202203021211167). （202203021211167）
