Final Hydrogen Mass Determined from Refueling Parameters

Abstract The final hydrogen mass in the tank at the end of the filling process of a compressed hydrogen storage system is a key indicator to show whether the tank has met the requirement of high final state of charge (SOC). In order to improve the SOC, the influencing factors on the final hydrogen mass and contribution of the influencing factors to the final hydrogen mass need to be investigated. To address this issue, a lumped parameter model has been developed and a thermodynamical analysis has been presented, thus we can obtain an analytical solution of the final hydrogen temperature. By rearranging the analytical solution, the function relationship between the final hydrogen mass and the refueling parameters can be obtained. In this article, we express the final hydrogen mass as the function of the mass filling rate, initial pressure and inlet temperature. For the three cases, the effects of mass filling rate, initial pressure and inlet temperature on the final mass are also shown, further the deduced equations are used to fit the reference data, the fittings show good agreement. With the fitted parameters, a new formula can be proposed to express the function relationship between final mass and the three parameters. We believe this study contributes to providing invaluable guidance in developing advanced refueling standard.