Abstract
Some cryogenic systems, such as superconducting magnetic energy storage and superconducting generators, require load-bearing supports to transfer forces to a room temperature (warm) structure. It is necessary to minimize the refrigeration power required to overcome heat leaks through the supports in order to improve system efficiency.
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Abbreviations
- A :
-
= strut cross-sectional area
- A 0 :
-
= strut cross-sectional area at room temperature
- C :
-
= efficiency constant
- D i :
-
= mathematical expression to be used with equation (18) of reference [1].
- F :
-
= force
- L :
-
= strut length
- T :
-
= temperature
- T C :
-
= cold-end temperature
- T H :
-
= hot-end temperature
- Q C :
-
= heat conducted to cold end
- C P :
-
= helium specific heat
- k :
-
= thermal conductivity
- m :
-
= total helium mass flow rate
- m c :
-
= helium mass flow rate to the support
- s :
-
= length variable
- x :
-
= liquefied fraction
- σ n :
-
= normalized stress to room temperature value
- σ 0 :
-
= allowable stress at room temperature
- λ :
-
= heat of vaporization
References
M. Hilal and R. W. Boom, in Advances in Cryogenic Engineering, Vol. 22, Plenum Press, New York (1977), p. 224.
A. Bejan and J. L. Smith Jr., Cryogenics 14(3):158 (1974).
A. Bejan and J. L. Smith Jr., in Advances in Cryogenic Engineering, Vol. 21, Plenum Press, New York (1976), p. 247.
A. Bejan, Cryogenics 15(5):290 (1975).
M. Hilal, Cryogenics 19(7):415 (1979).
J. Brooks and R. Donnelly, “The Calculated Properties of Helium II,” Tech. Report, The Institute of Theoretical Science, University of Oregon, Eugene, Oregon (1973).
M. D. Campbell, “Thermophysical Properties of Plastic Materials and Composites to Liquid Hydrogen Temp. (-423°F),” ML-TDR-64–33, Part III, Air Force Material Laboratory, Wright-Patterson Air Force Base, Ohio (August 1965).
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© 1980 Springer Science+Business Media New York
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Hilal, M.A., Eyssa, Y.M. (1980). Minimization of Refrigeration Power for Large Cryogenic Systems. In: Timmerhaus, K.D., Snyder, H.A. (eds) Advances in Cryogenic Engineering. Advances in Cryogenic Engineering, vol 35 A. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-9856-1_41
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DOI: https://doi.org/10.1007/978-1-4613-9856-1_41
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