进行了网格独立性测试，以获得人字形 PCHE 单元模型的最佳网格数。网格独立性测试分析了七种不同的网格大小。网格相关性测试结果表明：与 2.04×10⁷ 的网格数（网格 7）相比，6.86×10⁶ 的网格系统（网格 5）的压降和努塞特数的最大相对偏差小于 1.0%。因此，将使用网格 5 进行数值计算。在流体区域建立密集网格，而在固体区域则使用粗网格。边界网格有五层，第一层高度为 0.01 毫米，靠近壁面的增长率为 1.2。

A grid independence test is first carried out to obtain the optimum grid number for the zigzag PCHE unit model. Seven different grid sizes are analyzed in the mesh independence test. Compared to the number of mesh grids of 2.04× 10⁷ (mesh 7), the maximum relative deviation of the pressure drop and the Nusselt number of the grid system of 6.86× 10⁶ (mesh 5) is less than 1.0%. Therefore, mesh 5 will be used for numerical calculations. In the fluid zones, dense grids are established, while in the solid regions, coarse grids are used. The boundary grid has five layers, the first of which has a height of 0.01 mm and a growth rate of 1.2 near the wall.