Analysis of a Supercritical Hydrogen Liquefaction Cycle

Show full item record

Please use this identifier to cite or link to this item: http://hdl.handle.net/1853/39790

Title: Analysis of a Supercritical Hydrogen Liquefaction Cycle
Author: Staats, W. L. ; Smith, J. L. ,Jr. ; Brisson, J. G.
Abstract: A supercritical hydrogen liquefaction cycle is proposed and analyzed numerically. If hydrogen is to be used as an energy carrier, the efficiency of liquefaction will become increasingly important. By examining some difficulties of commonly used industrial liquefaction cycles, several changes are suggested and a readily scalable, supercritical, helium-cooled hydrogen liquefaction cycle is proposed. An overlap in flow paths of the two coldest stages allowed the heat exchanger losses to be minimized and the use of a single-phase liquid expander eliminates the pressure reduction losses associated with a Joule-Thomson valve. A computational model of the cycle was developed to investigate the effects of altering component efficiencies and various system parameters on the cycle efficiency. Furthermore, a heat exchanger simulation was developed to verify the feasibility and to estimate the approximate size of the heat exchangers in the cycle simulation. For a large, 50-ton-per-day plant with reasonable estimates of achievable component efficiencies, the proposed cycle offers a modest improvement in efficiency over the current state of the art. In comparison to the 30-40% Second Law efficiencies of today’s most advanced industrial plants, efficiencies of 39-44% are predicted for the proposed cycle, depending on the heat exchange area employed.
Description: Presented at the 16th International Cryocooler Conference, held May 17-20, 2008 in Atlanta, Georgia.
Type: Proceedings
URI: http://hdl.handle.net/1853/39790
ISBN: 978-1-934021-02-6
Date: 2008-05
Contributor: Massachusetts Institute of Technology. Cryogenic Engineering Laboratory
Relation: Cryocoolers 16. Commercial cryocooler applications
Publisher: Georgia Institute of Technology
ICC Press
Subject: Commercial cryocooler applications
Supercritical hydrogen liquefaction cycle
Second-law efficiency
Liquid hydrogen as an energy carrier

All materials in SMARTech are protected under U.S. Copyright Law and all rights are reserved, unless otherwise specifically indicated on or in the materials.

Files in this item

Files Size Format View
088.pdf 813.1Kb PDF View/ Open

This item appears in the following Collection(s)

Show full item record