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Stratification de gaz non condensables dans les phases liquides et gazeuses des frigorigènes.

Partitioning of non condensable gases in refrigerant liquid and vapour phases.

Auteurs : CAVESTRI R. C., SEEGER-CLEVENGER D.

Résumé

The distribution of the non condensable gases (NCGs) nitrogen and dry air in refrigerant liquid and vapour is determined at temperatures in the range of -16, 18.3, and 54.4°C at five different partial pressures (5, 15, 30, 45, and 60 psi) in each of eight refrigerants (R-22, 123, 124, 134a, 404A, 407C, 410A, and 507). R-123 is equilibrated at 43, 49, and 54°C with the same partial pressures, due to its high normal boiling point. The distribution is determined by measuring the concentration of the NCG in the liquid and in the vapour phases after equilibrium is achieved. Equilibrium is achieved by introducing the NCGs into the thermostatically controlled and highly agitated liquid refrigerant and circulating them until a constant pressure is achieved. The entire circulating and sampling mechanism, with NIST traceable pressure transducers, is held at constant temperatures. Samples of the liquid and vapour phases of the refrigerant mixture are expanded into smaller cells contained in a temperature controlled oven held at 60°C prior to gas chromatograph (GC) analysis. Sampling and analysis are accomplished without air exposure into a GC equipped with a thermal conductivity detector and hydrogen carrier gas. Gas solubility equations for each refrigerant are developed from the resulting values.

Détails

  • Titre original : Partitioning of non condensable gases in refrigerant liquid and vapour phases.
  • Identifiant de la fiche : 2009-1094
  • Langues : Anglais
  • Source : ASHRAE Transactions. 2008 Annual Meeting, Salt Lake City, UT. Volume 114, part 2 + CD-ROM.
  • Date d'édition : 21/06/2008

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