Advertisement

Insulation: The Reduction of ‘A’ and ‘B’ Heat In-flows

  • Ralph G. Scurlock
Chapter
  • 661 Downloads
Part of the SpringerBriefs in Energy book series (BRIEFSENERGY)

Abstract

All heat inflows are reduced as far as possible by using the correct insulations.

This chapter is concerned with identifying all the A and B heat inflows, and how these can be reduced individually, or collectively, with suitable insulations.

The first type, suitable for large tanks, is the gas-purged insulations such as perlite powder, fibreglass, plastic foams and rock wool. It is important that gas purged insulations totally fill the insulation space between inner and outer containers, with no holes or gaps. Any unfilled space will allow strong convection cells of purge gas to thermally short circuit the insulation. Ingress of water must also be excluded, because the water will freeze to ice, which has a high k value compared with the insulation.

The second type, suitable for smaller tanks, is evacuated insulations. The latest versions are composed of multi-layer reflective insulation MLI with extremely low k values, provided the vacuum is maintained.

Keywords

Boundary Layer Flow Plastic Foam Cryogenic System Heat Inflow Insulation Space 
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.

References

  1. 1.
    Scott, R.B.: Cryogenic Engineering. Van Nostrand, Princeton (1959). 6th reprint (1967)Google Scholar
  2. 2.
    Lynam, P., Proctor, W., Scurlock R.G.: Reduction of the Evaporation Rate of Liquid Helium in Wide Necked Dewars. Bulletin of IIR, Commission 1, Grenoble, Annex 1965-2, p. 351 (1965)Google Scholar
  3. 3.
    Lynam, P., Mustafa, A.M., Proctor, W., Scurlock, R.G.: Reduction of the heat flux into liquid helium in wide necked metal dewars. Cryogenics 9, 242 (1969)CrossRefGoogle Scholar
  4. 4.
    Boardman, J., Lynam, P., Scurlock, R.G.: Reduction of evaporation rate of cryogenic liquids using floating, hollow, polypropylene balls. In: Proc. ICEC3, Cryogenics, vol. 10, p. 133 (1970)Google Scholar
  5. 5.
    Dewar, J.: Proc. R. Inst. 15, 815 (1898)Google Scholar
  6. 6.
    Peterson, P.: The heat-tight vessel. PhD thesis, University of Lund, Sweden ((1951)Google Scholar
  7. 7.
    Hunter, B.J., Kropschot, R.H., Schrodt, J.E., Fulk, M.M.: Metal additives in evacuated powder insulations. Adv. Cryog. Eng. 5, 146 (1959)Google Scholar
  8. 8.
    Kropschot, R.H., Schrodt, J.E., Fulk, M.M., Hunter, P.J.: Multilayer insulations. Adv. Cryog. Eng. 5, 189 (1959)Google Scholar
  9. 9.
    Scurlock, R.G., Saull, B.: Development of multilayer insulations with thermal conductivities below 0.1 μW/cmK. Cryogenics 16, 303 (1976)CrossRefGoogle Scholar
  10. 10.
    Boardman, J., Lynam, P., Scurlock, R.G.: Solid/vapour heat transfer in helium at low temperatures. In: Proc. ICEC4, Eindhoven, p. 310 (1972)Google Scholar
  11. 11.
    Boardman, J., Lynam, P., Scurlock, R.G.: Complex flow in vapour columns over boiling cryogenic liquids. Cryogenics 13, 520 (1973)CrossRefGoogle Scholar
  12. 12.
    Islam, M.S., Scurlock, R.G.: Qualitative details of the complex flow in cryogenic vapour columns. Cryogenics 17, 655 (1977)CrossRefGoogle Scholar
  13. 13.
    Beresford, G.: LDV in cryogenic vapour columns. PhD thesis, Southampton University (1983)Google Scholar
  14. 14.
    Boardman, J.: Heat transfer in vapour columns. PhD thesis, Southampton University (1974)Google Scholar
  15. 15.
    Taconis, K.W., Beenakker, J.J.M., Nier, A.O.C., Aldrich, L.T.: Physica 15, 733 (1949)CrossRefGoogle Scholar
  16. 16.
    Rott, N.: Thermoacoustics. Adv. Appl. Mech. E20, 135 (1980)CrossRefGoogle Scholar
  17. 17.
    Tward, E., Mason, P.V.: Damping of thermoacoustic oscillators. Adv. Cryog. Eng. 27, 807 (1982)Google Scholar

Copyright information

© The Author(s) 2016

Authors and Affiliations

  • Ralph G. Scurlock
    • 1
  1. 1.University of SouthamptonSouthamptonUK

Personalised recommendations