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建立了竖直U型地埋管换热器与土壤耦合换热的三维数值模型,模型考虑了U型管的实际形状,管内流动状况与实际物理、几何条件完全符合,这与以前研究者将U型管两只管腿等效为柱热源的数学模型相比有质的改进,并把数值解与解析解进行了对比,得出在实际工程设计中,采用所建立的三维模型是可行的。同时,模拟了U型管轴向、周向、径向和沿U型管管长方向的温度变化趋势。为垂直U型地埋管的设计计算提供必要的参考。
A three-dimensional numerical model of vertical U-tube heat exchanger with soil heat transfer was established. The model considered the actual shape of the U-tube. The flow conditions in the tube were in good agreement with the actual physical and geometric conditions, U-tube two legs equivalent to the column heat source compared to the mathematical model of a qualitative improvement, and the numerical solution and analytical solution were compared, concluded that in the actual engineering design, the use of the established three-dimensional model is feasible. At the same time, the temperature trend of U-shaped pipe in axial, circumferential, radial and along U-shaped pipe was simulated. It provides the necessary reference for the design and calculation of vertical U-shaped buried pipe.