The present work focuses on developing a 2-D axisymmetric numerical model to study the dynamic behaviour of charging and discharging cycle for an elementary latent heat storage unit with simple geometry. The domain under consideration consists of a pipe of negligible thickness carrying heat transfer fluid (HTF), while being surrounded by latent heat storage medium or the phase change material (PCM). The PCM domain is considered to be 2-D axisymmetric and heat transfer mechanism is diffusion dominated. On the other hand, 1-D model is considered for the flow of HTF through the pipe. The heat transfer models in the PCM and HTF is coupled through the energy balance at the pipe wall. A fully implicit Finite Volume model is developed to obtain the evolution of temperature in PCM and HTF domain along with extent of melting/solidification in the PCM domain. Simulations are performed for charging and discharging of PCM domain considering pure PCM and PCM-Graphite composite with enhanced thermal conductivity. © 2018 by the authors of the abstracts.