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Analyse de l’obtention de températures quasi-cryogéniques.

[In Russian. / En russe.]

Auteurs : MARINJUK B. T., PORUTCHIKOV A. F., NIKITKINA G. V.

Type d'article : Article

Résumé

A high need of near­cryogenic temperatures at –150…–100°C level arises in applied fields of refrigeration. These temperatures are needed for different processes beginning from shock freezing of products to imitation installations for tests under extreme conditions. The obtaining temperatures of this range has some special features linked with a compressor operation, oil behavior in apparatuses (in case of vapor­compression cascade refrigerating machine), selection of low temperature refrigerant and constructional material that are able to work under such temperatures. The description of most acceptable methods of obtaining temperatures at ­130°C level to reveal the disadvantages and advantages of each of them is given. As variants are examined: vapor­compression cascade refrigerating plant; turbo­air refrigerating machine; gas refrigerating machine operating on Stirling reverse cycle and vacuum­evaporation refrigerating plant. The diagrams of all above­named plants are given. The dynamics of reduction of temperatures in the case of vacuum pumping of solid carbon as a working substance is theoretically studied. The dependences of temperatures produced during vapors exhausting on the time of exhausting for different masses of solid carbon dioxide are cited. The method of comparison of refrigerating plants is projected. Keywords: near­cryogenic temperatures, methods of obtaining temperatures at ­130?C, vacuum­evaporation refrigerating machines, solid carbon dioxide

Détails

  • Titre original : [In Russian. / En russe.]
  • Identifiant de la fiche : 30019696
  • Langues : Russe
  • Source : Kholodilnaya Tekhnika - n. 4
  • Date d'édition : 04/2015

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