Discharging process in TES is an important phenomenon because at the time of solidification occurs the release of thermal energy that can be used for certain purposes. A common constraint in experimental research using some additional variations is the difficulty of regulating the environmental conditions and the quality of the parameters. It is therefore necessary to study the simulation process of solidification paraffin wax using ANSYS Fluent software. This simulation can help to study the characterization of the solidification paraffin wax process inside the heat exchanger. Heat transfer fluid (HTF) is flowed through the inlet hole located on the tube axis line by assume wall friction is neglected and external wall heat loss is neglected, using a constant mass flow rate of 2 LPM. The simulation process is done by making the geometry of the tube, meshing with orthogonal quality value of 48%, input the boundary conditions used, set the convergence boundary and set the desired number of iterations then proceed with the temperature data at the discharging process by varying the temperature initial of PCM condition. CFD simulation results show heat transfer from paraffin to water at the beginning of discharging occurs by conduction and the effect of high temperature gradient causes a rapid decrease in paraffin temperature to the point of solidification area. The freezing characteristic in the axial direction is more predominant in the area closer to the inlet line. While freezing in the radial direction is influenced by gravity, the frozen paraffin will have a greater density so that the lower tube will freeze more than the upper tube. The initial temperature variation of PCM has a large influence on the discharging process.