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In the present study, melting behavior of RT50 as a phase change material in a shell and tube heat exchanger is considered. Therefore the effects of parameters including a geometrical property (eccentricity) and flow specifications (mass flow rate and inlet temperature of heat transfer fluid) on different decisive parameters of the PCM are investigated. The selected parameters which are critical for every storage systems are liquid fraction, melting time and thermal storage performance. Enthalpy porosity method is used for the modeling of phase change process and pure conduction and natural convection are considered in the simulation. The differential governing equations are solve using SIMPLE algorithm in which momentum and energy equation are discretized employing QUICK differentiating scheme. The grid size and the time step were chosen after careful examination of the independency of the results to …