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Ebullition en écoulement de R723 (ammoniac/diméthyléther) dans les tubes horizontaux lisses en présence d'huile.

Flow boiling of R723 (ammonia/dimethylether) in smooth horizontal tubes in the presence of oil.

Auteurs : BOYMAN T., KUHN C.

Résumé

Direct evaporation of the refrigerant inside tubes (flow boiling) allows for a significant minimization of the plant refrigerant charge. However, very small quantities of lubricant can have an important impact on the flow boiling, thus causing a decrease of the flow boiling heat transfer coefficient, depending on the miscibility of oil with the refrigerant. In a previous paper the authors presented experimental data for the evaporation of the natural refrigerant ammonia (R717) inside smooth horizontal tubes: experiments run with a frequently-used fully-synthetic oil (PAO with ISO-VG 68), which is immiscible with ammonia, with oil contents from 0.1 to 3% showed a very important decrease of the flow boiling heat transfer coefficient of ammonia.

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  • Prix public

    20 €

  • Prix membre*

    15 €

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : Flow boiling of R723 (ammonia/dimethylether) in smooth horizontal tubes in the presence of oil.
  • Identifiant de la fiche : 2007-1455
  • Langues : Anglais
  • Source : 2006 Purdue Conferences. 18th International Compressor Engineering Conference at Purdue & 11th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
  • Date d'édition : 17/07/2006

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