Blog icon

Hydrogen is cooled to cryogenic temperatures and compressed to pressures approaching 300 bar into a supercritical fluid.


Technology

What is it?

Hydrogen is cooled to cryogenic temperatures and compressed to pressures approaching 300 bar into a supercritical fluid. The cryo-compressed hydrogen can be further compressed to pressures up to 700 bar.

Why is it important?

More financially viable where high density hydrogen storage is required under limited space, or where a larger roundtrip distance is involved.

Characteristics

  • Volumetric hydrogen density: 49.6 g/L at 700 bar, 50.9 g/L at 350 bar
  • Gravimetric hydrogen density: 7.0% at 700 bar, 10.0% at 350 bar
  • Storage conditions: Commonly 250 to 350 bar, 23 to 35K. 78K at 700 bar, 66K at 350 bar also recorded
  • Well-to-tank efficiency efficiency range is 40-45%. The energy required to liquify the hydrogen is 6- 8 kW/kg H2. Well-to-tank efficiency includes from the feedstock natural gas consumed to the low heating value of H2 delivered to tank.

Benefits

  • Higher volumetric storage capacity than compressed gas
  • Fewer evaporation losses (boil off losses) than in typical compression mechanisms or liquid hydrogen
  • Cryo-compressed can be denser than liquid hydrogen – cryo-compressed hydrogen can be in liquid or gaseous state.
  • The dormancy is greatly extended as the allowable pressure inside the vessel increases

Limitations

  • Requires advanced and more expensive storage material

RD&D priorities

  • Reduce boil-off (i.e. vaporisation) rates
  • Improve engineering, insulation, heat exchangers and coolants
  • Create larger and better insulated storage tanks
  • Increase loss-free dormancy time (time before hydrogen will need to be vented from the tank)
  • Reduce material costs and improve durability for increased lifetime

Known active organisations

  • The University of Western Australia

Other opportunities like this

  • Hydrogen is liquefied and stored at -253°C, at ambient-moderate pressures, in cryogenic tanks through a multi-stage process of compression and cooling.

  • Hydrogen gas is compressed and injected via wells into subsurface formations.

Contact us

Find out how we can help you and your business. Get in touch using the form below and our experts will get in contact soon!

CSIRO will handle your personal information in accordance with the Privacy Act 1988 (Cth) and our Privacy Policy.


First name must be filled in

Surname must be filled in

I am representing *

Please choose an option

Please provide a subject for the enquriy

0 / 100

We'll need to know what you want to contact us about so we can give you an answer

0 / 1900

You shouldn't be able to see this field. Please try again and leave the field blank.