| abstract |
A simple analytical method is disclosed that can be used by hydrogen filling stations to directly and accurately calculate the end-of-filling temperature in a hydrogen tank which, in turn, allows increases in the amount of filling at the same time it tends Reduce replenishment time. The calculations involve the calculation of a compound heat capacity value, MC, from a set of thermodynamic parameters extracted from both the tank system that receives the gas and the station that supplies the gas. These thermodynamic parameters are used in a series of simple analytical equations to define a multi-stage process through which objective filling times, final temperatures and final pressures can be determined. The parameters can be communicated to the station directly from the vehicle or can be retrieved from a database accessible by the station. Because the method is based on direct measurements of actual thermodynamic conditions and quantified thermodynamic behavior, considerably improved tank filling results can be achieved. |