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Analysis of the back-gas behaviour of an automotive liquid hydrogen storage system during refilling at the filling station.

Author(s) : EMANS M., MORI D., KRAINZ G.

Summary

While refuelling liquid hydrogen storage systems using current technology, a certain amount of gas evaporates and is transferred back to the filling station. This so-called back-gas contributes significantly to a deterioration in the overall energy balance of liquid hydrogen as a fuel for automobiles. Based on data gained from dedicated measurements of a current prototype tank system, the thermodynamic state of the filled hydrogen was varied. It could be confirmed that a minimum amount of back-gas can be reached if the temperature of the transferred liquid is more than 2 K below the boiling temperature. Moreover, the data prove that the reason for the production of back-gas is not so much flashing but evaporation due to heat in-leak into the filling line. Based on these data, an optimised filling procedure for automotive liquid hydrogen storage systems shall be defined.

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Pages: 2006-3

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Details

  • Original title: Analysis of the back-gas behaviour of an automotive liquid hydrogen storage system during refilling at the filling station.
  • Record ID : 2007-1840
  • Languages: English
  • Source: Multiconference CryoPrague 2006 (9th Cryogenics 2006, ICEC 21, ICMC'06)
  • Publication date: 2006/07/17

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