In this study, the heat transfer and flow characteristics of triangular and rectangular finned tube bank were investigated numerically. The performance of triangular and rectangular finned tube bank was compared. The effects of fin height (1mm, 1.25mm and 1.5mm) on pressure and velocity of air and nitrogen liquid flows were studied to analyze which flow or model can increase the heat transfer coefficient of the finned tube heat exchanger. In this research, rectangular fins and triangular fins were designed by using cad tool creo-2.0 and then performed flow analysis on both models by using CAE tool (Ansys fluent). Hence it can be concluded that the triangular 1mm fin with nitrogen liquid is better than other to enhance the performance of the model.