【摘要】 为了探讨热渗耦合对土壤源热泵地埋管换热的影响,基于多孔介质传热传质及地下水渗流理论,通过耦合竖直方向一维流体模型与水平面内土壤二维非稳态热渗耦合模型,建立了考虑地下水渗流影响的准三维U型埋管热渗耦合模型。基于模型的数值求解,探讨了土壤热物性及地下水渗流对埋管换热特性的影响。结果显示:土壤导热系数与比热容的增大均有利于加强埋管的换热,且地下水渗流的存在有利于强化地下埋管与周围土壤间的换热能力,提高土壤源热泵系统的运行效率。实验验证表明,所建模型具有一定的预测精度,可为地下埋管换热器传热特性的研究提供理论基础。更多还原

【Abstract】 A quasi three-dimensional heat and advection coupling model of vertical U-bend GHE,which couples the one dimensional fluid model in vertical direction with the two-dimensional transient heat and moisture transfer model in level,was developed using the theory of heat and mass transfer in porous medium and ground water advection.Based on the numerical solution of the model,the effects of ground thermal property parameters and ground water advection on the heat transfer characteristics of U tube GHE were analyzed,the results indicated that the increase of ground thermal conductivity and specific heat can enhance the heat transfer characteristic.At the same time,the exist of ground water advection is benefit for the improvement of heat exchanger between the GHE and thus can improve the operation efficiency of GCHP.The experimental validation shows that the model can simulate the heat transfer process of GHE and provide a theoretical base for the study of the heat transfer characteristic of GHE.更多还原