Adsorbed natural gas (ANG) has been emerging as an attractive alternative to compressed natural gas and liquefied natural gas, on various circumstances. In spite of the advantages associated with ANG over other storage modes, there are some issues that need be properly addressed in order to ensure a viable employment of such alternative. One major problem is that the thermal effects associated with the sorption phenomena tend to diminish the storage capacity, thereby resulting in poorer performance. Hence, in order to design commercially viable storage vessels, the heat and mass transfer mechanisms that occur in these devices must be carefully understood and controlled. In this context, this work presents different mathematical models for simulating ANG charge and discharge processes. For the sake of improving the understanding of mass and energy transport within ANG vessels, dimensionless groups associated with this problem are also discussed. By using the proposed formulations, simulation results were numerically calculated and the process of charging ANG vessels was analyzed for different combinations of the presented dimensionless groups. Pressure, temperature and stored mass histories are compared, showing that the unwanted heating effects can be minimized for certain values of the dimensionless groups. Finally, a comparison between the results obtained using the two different formulations suggests that there may be cases in which the simpler model could be employed.

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