A 30 L/H Helium Liquefier for a 30 Mva Superconducting Synchronous Condenser

Yoshimura, Hideto; Kodera, Itsuo; Ogino, Osamu

doi:10.1016/b978-0-408-01252-2.50067-4

Cited by 4 publications

(1 citation statement)

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“…Shanner, 1976;Parrish and Voth, 1975;Voth and Parrish, 1977;Block et al, 1988;T-Raissi et al, 1991). Similar systems were constructed in Japan as reported by Yoshimura et al (1982) and Nagamura and Yamashita (1982).…”

Section: Introductionmentioning

confidence: 96%

Second law analysis of hydrogen liquefiers operating on the modified Collins cycle

Syed

Sherif

Везироглу

et al. 2001

Int. J. Energy Res.

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SUMMARYHydrogen liquefaction systems have been the subject of intense investigations for many years. Some established gas liquefaction systems, such as the precooled Linde}Hampson systems, are not used for hydrogen liquefaction in part because of their relatively low e$ciencies. Recently, more promising systems employing the modi"ed Collins cycle have been introduced. This paper reports on second law analyses of a hydrogen lique"er operating on the modi"ed Collins cycle. Two di!erent modi"cations employing the cycle in question were attempted: (1) a helium-refrigerated hydrogen liquefaction system and (2) a hydrogen-refrigerated hydrogen liquefaction system. Analyses were carried out in order to identify potential areas of development and e$ciency improvement. A computer code capable of computing system and component e$ciencies; exergy losses; and optimum number and operating conditions of compressors, expanders, aftercoolers, intercoolers, and Joule}Thomson valves was developed. Evaluation of the thermodynamic and transport properties of hydrogen at di!erent temperature levels was achieved by employing a hydrogen property code developed by researchers at the National Bureau of Standards (currently NIST). A parametric analysis was carried out and optimal decision rules pertaining to system component selection and design were reached. Economic analyses were also reported for both systems and indicated that the heliumrefrigerated hydrogen lique"er is more economically feasible than the hydrogen-refrigerated hydrogen lique"er.

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