Nuclear power plants could produce electricity using the Vortex Tower. Indeed, the heat from the secondary cooling system of a nuclear reactor can be used as a heat source to produce electricity rather than being released into the environment. An artificial vortex system is intended to increase the kinetic energy of hot air. This kinetic energy is used to produce electrical energy by utilizing a turbine installed just at the entrance to the chimney, where the air velocity is highest. So, the main effect used in Vortex Tower is the chimney force (the Coriolis effect) as a means to take heat out of a hot source. This study aims to analyse the vortex effects and Coriolis force along the chimney of a prototype vortex tower made at the level of the Nuclear Research Centre of Birine (CRNB) by changing the ambient temperature. The air kinematic field used in this study is calculated from a numerical simulation using the Relap5 code. The results obtained showed that a reduction in the ambient temperature causes an acceleration of the ascending air, which is also due to the difference in flow density as well as a strengthening of the vortex along the chimney.