aga8 equation of state

The main process that occurs in the CNG refueling station is filling fast process. The main objective of the present study is to apply a more accurate thermodynamic analysis of fast filling process than previous works. By using the thermodynamic analysis, a CNG refueling station with the cascade system, has been simulated. Comparing real and ideal gas models, it can be realized that the temperature profiles are highly different and temperature rise is much more for ideal gas model. the lack of Joule-Thompson cooling effect is the most important factor for this different. The results indicated that there is a temperature rise in order 50 K for real gas and 80 K for the case of ideal gas. The results of the present work have been validated against the experimental data and previous studies. The AGA8 Equation of State has been used to calculate the thermodynamic properties of CNG. The results show that the energy consumed by the compressor for a cycle is equal to 55.1 kWh and the average energy consumption is equal to 1.6 kWh for a vehicle.