The aim of this paper was to investigate the impact of heat sink and fins of varying heights on the performance of a Photovoltaic thermal panel when subjected to different air velocities. Heat sink and fins were employed to dissipate heat from the Photovoltaic thermal panels and ensure that they operated at their optimal temperatures. The study considered fin heights of 20mm, 40mm, and 60mm, with air velocities ranging from 1m/s to 7m/s. To model the heat transfer and fluid flow behaviour of the Photovoltaic Thermal panel under steady-state conditions, three-dimensional Computational Fluid Dynamics simulations were conducted using Ansys Fluent, while adhering to industry-standard panel dimensions of 1651 mm × 990.6 mm. The paper presented correlations for various dimensionless numbers, including Reynolds, Nusselt, and Stanton numbers, in relation to different fin heights and varying air velocities. The Reynolds number was found in the range from 2500 to 55000 across all cases examined in this study. The results showed that temperature reductions in the Photovoltaic Thermal panel were similar for both 40mm and 60mm fin heights after an air velocity of 3 m/s. Based on our findings, it is recommended to use heat sink and fins with a 40mm height at lower air velocities to facilitate effective heat dissipation and maintain favourable outlet temperatures. The study offers valuable insights for researchers and manufacturers seeking to develop optimal strategies for dissipating heat from photovoltaic panels and improving the accuracy of Computational Fluid Dynamics simulations for Photovoltaic thermal panel.