POD analysis of flow and heat transfer performance of tube fin heat exchanger on different boundary conditions

The traditional numerical simulation calculation time is long, and it is difficult to meet the needs of modern industry development. The method of combining body-fitted coordinates and proper orthogonal decomposition(POD) reduced-order model is used to calculate the heat transfer units of the flat tube fin heat exchanger. And its calculation results are compared with the results of the finite volume method (FVM). The results show that the POD method can accurately obtain the actual information under the boundary conditions of uniform wall temperature and uniform heat flux. But also, the calculation speed of POD is 3093 times of FVM. As for the cases of reconstructing the temperature field, the maximum error values under the boundary conditions of uniform wall temperature and uniform heat flux are 0.557% and 0.308%, respectively. As for the cases of reconstructing the velocity field, the maximum error values under the boundary conditions of uniform wall temperature and uniform heat flux are 1.26% and 1.9%, respectively. The conclusions of this study can supply theoretical reference for reasonable boundary condition in numerical design of the heat exchanger.