Share

IIR document

Exergy analysis of hydrogen liquefaction cycles.

Author(s) : TRAISSI A., HESSELMANN K., FUNK J. E.

Summary

The calculated efficiencies of the practical hydrogen liquefiers compare favorably with those derived for a modified Collins cycle. As a first approximation, it seems reasonable to study liquefaction systems for hydrogen and other cryofuels using simple relationships developed for a modified Collins cycle. The type of mechanical liquefaction cycle (Claude, cascade, etc) does not appear to affect the overall efficiency of a hydrogen liquefier. However, it is important to match the requirements imposed by the size and characteristics of the available compressors, expanders, heat exchangers, etc, whose efficiencies are most important for the global efficiency of the liquefaction plant. More detailed analysis of hydrogen liquefaction cycles can best be conducted using numerical techniques. When other actual losses not accounted for in the theoretical cycles discussed in the paper are taken into account, practical specific energy requirements greater than those predicted from theoretical cycles should be expected. According to the author's results, the overall efficiency of a well conceived liquefaction cycle (for production of 95% para-liquid hydrogen) can approach as high as 0.44 with proper optimization.

Available documents

Format PDF

Pages: 343-355

Available

  • Public price

    20 €

  • Member price*

    Free

* Best rate depending on membership category (see the detailed benefits of individual and corporate memberships).

Details

  • Original title: Exergy analysis of hydrogen liquefaction cycles.
  • Record ID : 1993-0657
  • Languages: English
  • Source: New challenges in refrigeration. Proceedings of the XVIIIth International Congress of Refrigeration, August 10-17, 1991, Montreal, Quebec, Canada.
  • Publication date: 1991/08/10
  • Document available for consultation in the library of the IIR headquarters only.

Links


See other articles from the proceedings (391)
See the conference proceedings

Indexing