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The accurate modeling of the fast-fill process occurring in Compressed Natural Gas (CNG)fuelled vehicle storage cylinders is a complex process and should be thoroughly studied.Final in-cylinder conditions should meet appropriate cylinder safety standards. Thecomposition of natural gas plays an important role on its thermodynamic properties andconsequently, on the fast-fill process and the final conditions. Here, a theoreticalanalysis has been developed to study the effects of the natural gas composition on thefilling process of an onboard Natural Gas Vehicle (NGV) cylinder. The cylinder is assumedas a lumped system. The analysis is based on laws of thermodynamics and mass balance.Based on AGA8 Equation of State (EOS) and thermodynamics relationships, the requiredproperties of natural gas mixtures have been calculated. The results are presented for anadiabatic system. The results show that the compositions of natural gas have great effectson the filling process and final in-cylinder conditions. Furthermore, the gas with lessmethane percentage in its composition is more suitable for the filling process

Effects of Natural Gas Compositions on CNG Fast Filling Process for Buffer Storage System