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Document IIF

Ebullition d'un mélange ammoniac-lubrifiant sur un faisceau de tubes à surface augmentée avec qualité de vapeur d'entrée.

Boiling of ammonia/lubricant mixture on an enhanced tube bundle with inlet vapour quality.

Auteurs : CHYU M. C., ZHENG J., AYUB Z.

Résumé

The performance of ammonia/lubricant mixture boiling on the outside (shell side) of an enhanced-tube bundle was investigated. Boiling heat transfer coefficients of individual tubes in a 3 x 5 tube bundle were measured, enabling a detailed study of bundle effect as well as other effects such as heat flux, inlet quality, concentration of miscible lubricant (co-polymer of polyalkylene glycol, PAG), saturation temperature and heat transfer enhancement. Tests were conducted in the range of heat flux from 3.2 to 32.0 kW/m2, simulated inlet quality from 0.0 to 0.4, saturation temperature from -13.2 to 7.2°C, and lubricant concentration from 0 to 10%. Bundle effect was investigated and bundle heat transfer performance was compared with that of a single tube.

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Pages : 2008-2

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Détails

  • Titre original : Boiling of ammonia/lubricant mixture on an enhanced tube bundle with inlet vapour quality.
  • Identifiant de la fiche : 2009-0029
  • Langues : Anglais
  • Source : 8th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2008)
  • Date d'édition : 07/09/2008

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