Joule-Thomson Refrigeration
Sam Coogan
Adiabatic Expansion
• Many ways to have
adiabatic expansion
– Constant Entropy
(Isentropic)
– Constant Internal Energy
(Free Expansion)
– Constant Enthalpy
(Joule-Thomson)
Joule-Thomson Effect
• Throttling process reduces pressure
• Caused by non-idealities
• Joule-Thomson Coefficient
Why?
• Cooling at very low temperatures
• Achievable Cryogenics
• Short cool down time
Applications
• Cryogenic Freezing (Cryonics)
• Gas liquefaction (O2, N2, Ar)
• Linde Technique (Liquefaction of Air)
Sources
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http://www.aero.org
http://www.thales-cryogenics.com
http://www.wikipedia.org
www.cryogenicsinternational.com