H2Ref shares project findings

H2Ref shares project findings

H2Ref, a project which looks at the development hydrogen stations, has shared its findings from its most recent project.

The European project said that it aims to develop a hydrogen refuelling station which is cost effective, efficient and reliable for high-pressure hydrogen dispensing.

It aims to address the refuelling of 70 MPa passenger fuel cell vehicles by developing a new compression and buffering process. This process is based on the use of hydro-pneumatic accumulators, which provide a more reliable and economical solution.

In the recently shared webinar, representatives from the project answered the following:

Question: What is the expected cycle life of the bladder accumulator?

Answer: There are two parts to consider in the bladder accumulator cycle life, the shell and the bladder.

The shell base assumptions are:

Medium pressure – expectation is over 15-year life – based on 20 cycles per day (based on 365 days), 2 ½ cycles per refuelling = around 275,000 cycles.

High pressure – Expectation is over 15-year life – based on, 20 cycles per day (based on 265 days), 1 cycle per refuelling = around 110,000 cycles.

The same bladder is in both the medium and high-pressure vessels.

The bladder is classed as a consumable part with an expected life of around two years.

Target – 35,000 cycles – based on 20 cycles per day (based on 265 days), 2 ½ cycles per refuelling = around 36,500 cycles.

Question: When do you see this technology commercialised?

Answer: The project is currently a full-scale prototype and is being validated in a relevant industrial environment some we would regard it as being around Technology Readiness Level 5.

The next stage would increase the operating time and start to demonstrate it in the relevant environment to achieve Technology Readiness Level 7.

Question: What other applications do you see this being used for?

Answer: The technology is suitable for both constant and intermittent application, therefore we see that this could be extended to all fuelling applications at different pressures and quantities of fuelling.

There are additional possibilities for tube trailer and cylinder bundle filling, downstream of production from something like a PEM electrolyser to create a hydrogen network model of refuelling and distribution.

Question: Who do you see taking this type of product to market?

Answer: Clearly the two main industrial partners in the consortium (Hexagon and Haskel) can see the benefits in this technology and how it could complement their existing portfolio of products, therefore it would be most like that the industrial partners will be key in taking this to a commercialised product offering.


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