s.r Moosavi - Department of Chemical Engineering, Faculty of Engineering, University of Kurdistan, Sanandaj ۶۶۱۷۷, Iran.
m Khamforoush - Department of Chemical Engineering, Faculty of Engineering, University of Kurdistan, Sanandaj ۶۶۱۷۷, Iran.
s.a Khamforoush - School of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran.
k Rahimzadeh - National Iranian Oil Products Distribution Company, Kurdistan Region, Sanandaj, Iran.

In this study, fast filling process of NGV cylinders is simulated in a FORTRAN based computer program. In this model, AGA-8 equation of state was utilized to compute compressibility factor and other required thermodynamic properties such as internal energy, enthalpy and specific heatsof natural gas. The accuracy of model was evaluated by comparing the acquired results with realdata. The real data was gathered for three kinds of NGV tanks at a CNG station. Our comparisondemonstrated that, there is a reasonable agreement between modeling and experimental data at the whole charging period. Furthermore, it is demonstrated that temperature elevation of natural gas during the fast filling process is the main factor that prevents the 100% full fill in each refueling

AGA-8 equation of state, compressed natural gas, fast filling process