Simultaneous thermodynamic simulation of CNG filling process

Hamid Reza Rahbari,Mahdi Deymi-Dashtebayaz,Mahmood Farzaneh-Gord

doi:10.2478/pjct-2014-0002

Hamid Reza Rahbari, Mahdi Deymi-Dashtebayaz

Open Access

https://doi.org/10.2478/pjct-2014-0002

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Abstract

Abstract In CNG station, the fuel is usually stored in the cascade storage bank to utilize the station more efficiently. The cascade storage bank is generally divided into three reservoirs, commonly termed low, medium and high-pressure storage bank. The pressures within these reservoirs have huge effects on the performance of the stations. In the current study, a theoretical simulation based on mass balance and thermodynamic laws has been developed to study the dynamic fast fi lling process of vehicle’s (NGV) cylinder from the cascade storage bank. The dynamic change of the parameters within the storage bank is also considered. Natural gas is assumed to contain only its major component, methane, and so thermodynamic properties table has been employed for finding the thermodynamics properties. Also the system is assumed as a lumped adiabatic system. The results show that the initial pressure of the cascade storage bank has a big effect on the storage bank volumes for bringing up the NGV cylinder to its target pressure (200 bar). The results also showed that ambient temperature has effect on the refueling process, chiefly the final NGV cylinder and the cascade storage bank conditions

Highlights

Compressed natural gas (CNG) is considered one of the most promising fuel alternatives for vehicles because it is a relatively clean-burning fuel compared with gasoline[1]
In the CNG station, the filling process should be completed when the final pressure of the natural gas vehicles (NGVs) cylinder reaches to 200 bar
The initial pressure of storage bank has a big effect on the necessary storage bank volume for bringing up the NGV cylinder to its target pressure

Summary

Simultaneous thermodynamic simulation of CNG filling process

In CNG station, the fuel is usually stored in the cascade storage bank to utilize the station more efficiently. The cascade storage bank is generally divided into three reservoirs, commonly termed low, medium and high-pressure storage bank. The pressures within these reservoirs have huge effects on the performance of the stations. Natural gas is assumed to contain only its major component, methane, and so thermodynamic properties table has been employed for finding the thermodynamics properties. The results show that the initial pressure of the cascade storage bank has a big effect on the storage bank volumes for bringing up the NGV cylinder to its target pressure (200 bar). The results showed that ambient temperature has effect on the refueling process, the final NGV cylinder and the cascade storage bank conditions

INTRODUCTION

NATURAL GAS REFUELING STATION

THERMODYNAMIC MODEL

Entropy generation model

The numerical procedure

RESULTS AND DISCUSSION

CONCLUSION

RP Ratio of pressure

LITERATURE CITED