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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。
In order to investigate the effect of heat and moisture coupling on the heat transfer of ground-source heat pump in ground tube, based on the heat and mass transfer of porous media and groundwater seepage theory, by coupling the vertical one-dimensional fluid model with the two-dimensional unsteady thermal-hydraulic coupling Model, a quasi-three-dimensional U-tube heat-moisture coupling model considering the influence of groundwater seepage is established. Based on the numerical solution of the model, the influence of soil thermophysical properties and groundwater seepage on the heat transfer characteristics of the buried pipe was discussed. The results show that the increase of soil thermal conductivity and specific heat capacity are all conducive to heat transfer enhancement, and the existence of groundwater seepage is conducive to strengthening the heat exchange capacity between buried pipe and surrounding soil and improving the operation efficiency of ground-source heat pump system. Experimental results show that the proposed model has some predictive accuracy and can provide theoretical basis for the study of heat transfer characteristics of underground heat exchangers.