Français
1. Thermodynamics reminder
Before tackling the subject, it is interesting to know the theoretical power required to carry out the refrigeration operation at any temperature: what is the ideal value (i.e. minimum calculated by describing a Carnot cycle) of the power to be expended at room temperature (generally, power taken from the electrical network) to be able to absorb one unit of thermal power dissipated at a temperature lower than room temperature? There are two cases to consider, depending on whether operation is isothermal or non-isothermal.
1.1 Isothermal operation
If the power is dissipated in a bath of boiling liquid at constant pressure, the temperature is and remains constant, whatever the power dissipated: the regime is isothermal....
The Ultimate Scientific and Technical Reference
This article is included in
Industrial cooling
This offer includes:
Knowledge Base
Updated and enriched with articles validated by our scientific committees
Services
A set of exclusive tools to complement the resources
Practical Path
Operational and didactic, to guarantee the acquisition of transversal skills
Doc & Quiz
Interactive articles with quizzes, for constructive reading
Thermodynamics reminder
Refrigeration and liquefaction regimes
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.
...
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.
Directory
Manufacturers
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.
The Ultimate Scientific and Technical Reference
