As hydrogen technology becomes more and more popular, this session introduces hydrogen liquefaction for small and middle size machines. Persons who plan to get into the hydrogen liquefaction activity.
Each participant brings his/her PC loaded with the REFPROP® software. Participants must be familiar with Excel®. This educational session takes place within a five-day period (total time is around 35 hours). The duration and extend of the program can be adapted to specific needs.

• A few general reminders on cryogenics
  
• Heat exchanger theory
  
• Brayton cycles
  
• Liquid nitrogen pre-cooling
  
• Brayton cycle for liquefaction of hydrogen
  
• Helium compression with oil lubricated screw compressor
  
• Final oil removal
  
• Heat exchanger technology
  
• Cryogenic expansion turbines
  
• Process control
  
• Some practical aspects on transient situations
  
• Why and how a gas is polluted
  
• Helium and hydrogen purification by adsorption
  
• Helium and hydrogen analysis
  
• Simple thermodynamical calculations on helium and hydrogen (number of attendees limited to 10)

Visit of a local hydrogen liquefaction plant or a helium refrigeration plant.