Conveners
C3Or4B: Components VII: Cryogenic Heat Exchangers
- Bertrand Baudouy (CEA Paris-Saclay)
Liquid Nitrogen precooling is used in most Cryoplants to achieve cooldown to 80 K temperature range. In one such system at Fermilab’s CMTF Superfluid Cryoplant, where the Helium supply directly exchanges heat with liquid Nitrogen, freezing of Nitrogen occurred inside the heat exchanger due to heat exchanger imbalance during a Cryoplant trip. Trapped vapor pockets of N2 within the frozen heat...
Recuperative heat exchangers play an important role and have a large influence on the overall efficiency in many cryogenic systems. The recuperators to achieve fast cooldown can be summarized as effective, compact, and low pressure-drop. Designing this type of heat exchanger has been a challenge, especially when the size and effectiveness objectives are becoming more and more strict with the...
Practical regenerative refrigerators are capable of working down to 4 K and largely fulfill the refrigeration requirement of modern technologies in many fields, especially for space applications. However, the enthalpy flow associated with the pressure dependence, abbreviated as pressure-induced enthalpy flow, brought about by real gas effects degrades the theoretical COP of the refrigerator to...
