The results of such paper of study and analysis, heat transfer and pressure loss of different shapes of the heat sink with the rectangular duct surface time zone are the same. There are two shaped fins are used by the analysis of the rectangle the shark fin, cylindrical (round). The purpose of the study was to determine the optimal size and shape of the rectangular longitudinal fins, Cylindrical Pin Fin, including horizontal thermal conductivity. This analysis has been completed the calculated maximum heat transfer rate of the fin surface and minimum pressure loss in the pipeline as a result of the shape of the change. The results of various calculations of different Nusselt no for Laminar and turbulent. After solving the problem of post-processing after the completion of the discovery of different results as outline figure, the X-Y plot and vector drawing the Laminar and turbulent flows including the heat transfer rate and pressure loss. In the light of the discussions on the basis of the results, print data concluded that heat transfer is the smallest rectangle shaped fins on the surface and the large round Pin Fin surface and pressure loss is the minimum piping, round the fins to enable it to make better use of the maximum heat transfer rate is required.