垂直U型地埋管换热器的数值模拟分析  

NUMERICAL SIMULATION ANALYSIS ON VERTICAL U-TUBE UNDERGROUND HEAT EXCHANGER

作　　者：连小鑫[1,2] 刘金祥[1] 陈晓春[2] 李莹[2] 丁高[2] 

机构地区：[1]南京工业大学城市建设与安全工程学院,南京210009 [2]中国建筑设计研究院,北京100044

出　　处：《太阳能学报》2012年第1期48-55,共8页Acta Energiae Solaris Sinica

基　　金：国家科技支撑计划课题科技奥运专项(2007BAK12B06)

摘　　要：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。The influence of ground thermal properties, fluid velocity, groundwater velocity and backfill material thermal conductivity on heat transfer of underground heat exchanger was analyzed by using Fluent software. The re- sult showed that the heat exchange of underground heat exchanger is proportional respectively to fluid velocity, groundwater velocity, ground thermal conductivity and backfill material thermal conductivity, respectively. The functional relationships have been obtained respectively between daily average heat exchange and fluid velocity, groundwater velocity and backfill material thermal conductivity. Thermal diffusivity of soil has distinct effect on thermal effective radius of underground heat exchanger and the higher ground thermal diffusivity is, the longer ther- mal effective radius is. Further more, the higher groundwater velocity is, the shorter time is needed to reach heat transfer stabilization, the more uneven temperature along the direction of soil circumference is and the faster soil temperature return back to original condition.

关 键 词：垂直U型地埋管 数值模拟 热渗耦合换热 热作用半径 

分 类 号：TK52[动力工程及工程热物理—热能工程]