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Article | REF: BE9731 V1

Refrigerating machines theory - Mechanical compression machines. Single-stage cycles

Authors: Maxime DUMINIL, Jean-Pierre DOMBLIDES

Publication date: April 10, 2012, Review date: October 16, 2019 | Lire en français

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    7. Special case of carbon dioxide CO2

    CO 2 entered the technical world a very long time ago, since it was first liquefied, then solidified, in the first third of the 19th century. Its use in compression refrigeration cycles, which began around 1866, remained very limited until recent years, when it has virtually disappeared. It has a number of disadvantages:

    • its critical temperature (q cr ) is low, +31.06°C; unlike other common refrigerants, conventional air or water chillers do not allow condensation;

    • its triple point temperature (q tr ) is relatively high, – 56.57°C. The temperature range (T cr – T tr ) in which the liquid...

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