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4. Special cycles
All liquefaction or refrigeration cycles are made up of assemblies of Brayton cycles and Joule Thomson cycles, possibly modified. Let's take a look at some of them.
4.1 High-power cycles
A cycle capable of absorbing high powers (e.g. over 1 kW at 4.5 K) must, above all, be efficient. To achieve this, it is necessary, if possible, to expand with external work absolutely all the flow that has been compressed. The energy extracted by the expansion machines should be recovered, but this is not currently the case. The Brayton pre-cooling stages also need to be expanded at optimally staggered temperatures. The number of expansion stages also needs to be optimized. Considerations specific to the plant to be cooled must also be taken into account (temperature requirements...
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Special cycles
Refrigerator and liquefier components
Bibliography
Also in our database
Software tools
CRYODATA http://www.cryodata.com/
Cryodata develops software for calculating the thermodynamic properties of fluids and solids, with a focus on cryogenic temperatures.
GASPAK calculates 28 thermophysical properties of 36 fluids with boiling points between 4 K and room temperature.
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Events
International Cryogenic Engineering Conference (ICEC) http://mgt-icec.web.cern.ch/mgt-icec/
International conference held every even-numbered year, in Europe or other continents except North America.
Patents
US patent 5 499 505 dated 03/19/1996, Helium refrigerator with compressor control
US patent 5 941 095 dated 08/24/1999, Process for compressing a gas at low temperature and low pressure, corresponding compression line and refrigeration plant.
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Air Liquide Advanced Technology (AL.AT)
Helium liquefiers and refrigerators, helium scrubbers, etc. http://www.airliquideadvancedtechnologies.com/
Linde Kryotechnik AG
Helium liquefiers and refrigerators, helium scrubbers, etc.
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