20K helium refrigerator adopts helium reverse turbine-Brayton cycle to realize the 20K Cooling. In a 20K helium refrigerator, the helium gas below 20K is used to provide cooling for the user’s equipment, and after cooling it returns to the cold box for the purpose of recovering the sensible heat and recycling.
Main equipment of 20K helium refrigerator includes compressor, oil removal system, 20K cold box, control system, helium buffer tank, etc. The 20K cold box is a vacuum insulated cold box which contains the multi-stage heat exchangers, turbine expanders, internal adsorbers, cryogenic valves and measuring elements.
| Small Scale | Medium Scale | Large Scale |
| 500W-1000W | 1000W-2000W | ＞2000W |
20K Helium Liquefiers
Case Study 1