论文部分内容阅读
采用Fluent软件对垂直U型地埋管三维非稳态热渗耦合换热进行研究。分析了土壤热物性、管内流速、渗流速度以及回填材料的导热系数对地埋管的换热影响。结果表明:地埋管的换热量分别与管内流速、渗流速度、土壤的导热系数以及回填材料的导热系数成正比,通过拟合分别获得平均每天换热量与管内流速、渗流速度和回填材料导热系数的关系式;土壤的热扩散系数对地埋管的热作用半径影响显著;同时渗流速度越大,换热稳定时间越短,土壤圆周方向上各点温度相差越大,且土壤温度场恢复能力越好。
Fluent software was used to study the three-dimensional unsteady heat and moisture coupling of vertical U-shaped buried pipe. The effects of soil thermophysical properties, pipe flow velocity, seepage velocity and thermal conductivity of backfill material on the heat transfer of buried pipe were analyzed. The results show that the heat transfer of buried pipe is directly proportional to the flow velocity, seepage velocity, the thermal conductivity of soil and the thermal conductivity of backfill respectively. The average daily heat transfer, flow rate, seepage velocity and backfill material The thermal diffusivity of the soil has a significant effect on the thermal radius of the buried pipe. The larger the seepage velocity, the shorter the heat transfer and stabilization time, the greater the difference between the temperature of the soil in the circumferential direction and the temperature field Resilience is better.