In a typical Hydrogen Refueling network (Example); Hydrogen is
- Produced via electrolysis at 20-30 bar
- Compressed to 150 - 250 bar and stored in Low Pressure (LP) Storage
- loaded onto a hydrogen tube trailer, transported to site and stored in Low Pressure (LP) Storage
- Further compressed to 900-1,000 bar and stored in temporary High Pressure (HP) storage
- Precooled to -40c then fed to the Hydrogen Dispenser at 700 bar with a flow rate of ~3.6kg/min
Questions I had were
- Assuming ambient temperature of 20c, Roughly how long will it take after compression for the temperature of hydrogen in both LP and HP storage to equalize with ambient temperature.
- How does the Hydrogen pressure drop from 900 - 1,000 bar to 700 bar between steps 4 & 5?
- Why does the Hydrogen need to be cooled to -40c before being dispensed into a vehicle in step 5?