热渗耦合作用下地下埋管换热器的传热分析
Heat transfer analysis of underground hear exchangers under coupled thermal conduction and groundwater advection conditions
摘要：
为确定地下水渗流对U型地下埋管换热器的影响，基于热渗耦合作用下的数学模型，采用整体求解方法求得管内流体、地下埋管换热器及周围土壤的温度场数值解。分析了地下水渗流对传热过程的影响，结果表明地下水流动对原温度场的影响明显，而且地下水流速越高影响越大。进一步分析了有渗流时不同土壤类型对地下埋管换热器的影响情况，在饱和状态下导热系数是主要的影响因素。
Abstract：
To determine extent of the effect of groundwater advection on Utype vertical underground heat exchangers, based on a mathematics model considering thermal conduction and groundwater advection, utilizes an overall solution to obtain the whole temperature field including fluid in pipe, pipe wall and surrounding soil. The results indicate that groundwater flow has notable effects on original temperature field and that the higher the groundwater velocity is, the larger the effect is. Then through calculation of several cases with different soil type, concludes that the thermal conductivity of soil has more influence than water content.
Keywords:groundsourceheatpump,undergroundheatexchanger,coupledthermalconductionandgroundwateradvection,numericalanalysis,temperaturefield