Room-Temperature Machinery

  • A. J. Croft
Part of the The International Cryogenics Monograph Series book series (INCMS)


Compressors are required in cryogenic refrigeration systems for two distinct purposes: as part of the thermodynamic cycle of a liquefier or refrigerator, and as a means of storing a gas at room temperature; sometimes these functions can be performed by the same machine. The thermodynamic necessity for a compressor has already been made clear by implication in the last chapter. It is not merely there to push the working substance round the system, but in an internal-work system to raise the pressure of the working substance to a value such that at the precooling temperature the enthalpy is smaller than that at atmospheric pressure to the extent required to give the desired performance. In an external-work system the function of the compressor is to reduce the entropy — in this role Simon referred to compressors as “entropy squeezers.”


Piston Ring Exhaust Valve Relief Valve Booster Pump Shaft Seal 
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.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Croft, A. J., Cryogenics 4, 143 (1964).CrossRefGoogle Scholar
  2. 2.
    Rietdijk, J. A., van Beukering, H. C. J., van der Aa, H. H. M, and Meijer, R. J., Philips Tech. Rev. 26, 10 (1965).Google Scholar
  3. White, F. G., Industrial Air Compressors, Foulis, London, 1967.Google Scholar
  4. Yarwood, J., High Vacuum Technique, Chapman & Hall, 4th edition, 1967.Google Scholar

Copyright information

© Springer Science+Business Media New York 1970

Authors and Affiliations

  • A. J. Croft
    • 1
  1. 1.Clarendon LaboratoryUniversity of OxfordUK

Personalised recommendations