7. Process control

It enables control actions to be carried out precisely and in good time. The operator can monitor machine parameter values, plot trend curves, etc. Modern small and medium-sized liquefiers and refrigerators are now always automatically controlled by a process controller, usually integrated into the cold box module for smaller machines.

A large refrigerator the size of those installed at CERN is controlled by around 40 control loops! Let's take a look at a few aspects of liquefier/fridge control.

Calculation of a Claude cycle operating at a speed different from nominal conditions

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Process control

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page Operation at speeds other than nominal

Structure of a refrigerator or liquefier

Bibliography

Also in our database

MARVILLET (C.), BONTEMPS (A.), HUETZ (J.), GARRIGUE (A.), VIDIL (R.), GOUBIER (C.), MERCIER (P.) - Échangeurs de chaleur – Définitions et architecture générale. - [B 2 340] , 10 fév. 1994.
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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.

Cryogenic Engineering Conference (CEC)

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.