CRYOGUY Education in Cryogenics
Standard helium refrigeration
STANDARD HELIUM REFRIGERATION
A detailed presentation of what somebody dealing with helium refrigeration should know.
Whom for?
Persons who plan to design or operate middle or large size helium refrigeration and liquefaction plants.
How long?
This educational session takes place within a four-day period (total time is around 28 hours).
PROGRAMME
Theory, thermodynamical cycles
  • General reminders
  • Theory of heat exchangers
  • Basic thermodynamical cycles
  • Liquid nitrogen pre-cooling
  • Thermal shield cooling
  • High power thermodynamical cycles
  • Refrigeration cycles for temperatures lower than 4.5 K
Technology and operation of the main components
  • The oil lubricated screw compressor
  • The final oil removal system
  • The heat exchangers
  • The bearings for cryogenic rotating machines
  • The cryogenic expansion turbine
  • The cryogenic centrifugal compressor
Operation in off-design conditions
Process control
  • Process control in helium refrigeration
  • Transient situations
Helium purity
  • Pollution of helium
  • Purification by adsorption
  • Purification by cryo-trapping
  • Helium analysis
Maintenance of helium liquefaction/refrigeration plants
Visit of a liquefier or refrigerator.


A possible addition of high interest: simple thermodynamical calculations on helium.