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Thermodynamic Optimization of Helium Liquefaction Cycles

  • R. H. Hubbell
  • W. M. Toscano
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 35 A)

Abstract

With the advent of superconducting technology, there has been a major emphasis in the design of helium refrigeration/liquefaction systems. In the past, refrigeration systems have been designed and built to provide cryogenic cooling to the superconducting windings. However, because of the large demand for refrigeration at cryogenic temperatures and the increase in energy costs, a renewed interest has developed in designing helium refrigeration/liquefaction systems which are much more energy efficient. Recent examples of superconducting applications have been mentioned in the literature [1].

Keywords

Heat Exchanger Entropy Generation Heat Leak Thermodynamic Optimization Isentropic Efficiency 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notation

h

= specific enthalpy

= mass flow rate

N2

= nitrogen mass flow rate

c

= compressor mass flow rate

T

= turbine mass flow rate

L

= liquid helium flow rate

P

= pressure

\(\dot Q\)

= heat transfer rate

\(\dot Q_{\rm{hl}}\)

= heat leak

R

= gas constant

S

= entropy

s

= specific entropy

T

= temperature

T0

= ambient temperature

Ts

= temperature at which entropy is generated

υ

= specific volume

Wact

= actual work

ΔWirr

= irreversible work

Wrev

= reversible work

ΔṠirr

= entropy generation term

ΔT

= temperature difference

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References

  1. 1.
    B. W. Birmingham and C. N. Smith, Cryogenics 16:59 (1976).CrossRefGoogle Scholar
  2. 2.
    S. C. Collins, Rev. Sci. Instr. 18(3): 157 (1947).CrossRefGoogle Scholar
  3. 3.
    S. C. Collins, Science, 116:289 (1952).CrossRefGoogle Scholar
  4. 4.
    S. C. Collins, R. W. Stuart, and M. H. Streeter, Rev. Sci. Instr. 38(11): 1654 (1967).CrossRefGoogle Scholar
  5. 5.
    C. Trepp, in Advances in Cryogenic Engineering, Vol. 7, Plenum Press, New York (1962), p. 251.Google Scholar
  6. 6.
    C. Trepp, in Liquid Helium Technology, International Institute of Refrigeration, Pergamon Press, London (1966), p. 215.Google Scholar
  7. 7.
    R. W. Stuart, W. H. Hogan, and A. D. Rogers, in Advances in Cryogenic Engineering, Vol. 12, Plenum Press, New York (1967), p. 564.Google Scholar
  8. 8.
    R. F. Barron, in Advances in Cryogenic Engineering, Vol. 7, Plenum Press, New York (1962), p. 20.Google Scholar
  9. 9.
    R. O. Voth and D. E. Daney, in Proceedings 10th Intersociety Energy Conversion Engineering Conference, IEEE, New York (1975), p. 1356.Google Scholar
  10. 10.
    D. E. Daney, in Advances in Cryogenic Engineering, Vol. 21, Plenum Press, New York (1976), p. 205.Google Scholar
  11. 11.
    A. Khalil and G. E. McIntosh, in Advances in Cryogenic Engineering, Vol. 23, Plenum Press, New York (1978), p. 431.CrossRefGoogle Scholar
  12. 12.
    W. M. Toscano and F. J. Kudirka, in Advances in Cryogenic Engineering, Vol. 23, Plenum Press, New York (1978), p. 456.CrossRefGoogle Scholar
  13. 13.
    T. P. Hosmer, L. C. Hoagland, and W. M. Toscano, “A 10 Liter Per Hour Helium Liquefier for a Superconducting Ship Propulsion System,” presented at Cryogenic Engineering Conference, Boulder, Colorado, August, 1977.Google Scholar
  14. 14.
    R. H. Hubbell, “A 1400 L/Hr Helium Liquification Cycle,” presented at 71st Annual AIChE Conference, Miami, Florida, November, 1978.Google Scholar
  15. J. L. Smith, Jr., Massachusetts Institute of Technology, private communication.Google Scholar
  16. J. L. Smith, Jr., “The Presentation of Heat Transfer and Friction Factor Data for Heat Exchanger Design,” ASME publication 66-WA/HT-59.Google Scholar

Copyright information

© Springer Science+Business Media New York 1980

Authors and Affiliations

  • R. H. Hubbell
    • 1
  • W. M. Toscano
    • 2
  1. 1.Arthur D. Little, Inc.CambridgeUSA
  2. 2.Foster-Miller AssociatesWalthamUSA

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