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Évaporation à détente directe de l'ammoniac côté calandre sur un faisceau de tubes plats avec effet de surchauffe en sortie sur la qualité de vapeur à l’entrée.

Shell side direct expansion evaporation of ammonia on a plain tube bundle with inlet quality effect in the presence of exit superheat.

Auteurs : ABBAS A., AYUB Z. H., AYUB A. H., et al.

Type d'article : Article, Article de la RIF

Résumé

In the present study, tests were performed to investigate the direct expansion evaporation characteristics of ammonia on shell side of triangular pitch plain tube bundle at saturation temperature of -1.7 °C and -20 °C, with heat flux ranging from 5 to 45?kW m-2, and inlet quality from 0 to 30% with exit degree of superheat ranging from 2 to 10 °C. The results suggest that heat transfer coefficient increases with both saturation temperature and heat flux and decreases with degree of exit superheat. The inlet quality effects were more significant at higher saturation temperature than at lower saturation temperature. A correlation was developed for outside boiling of ammonia on plain tube bundle in direct expansion mode with inlet vapor quality and compared with previous pool boiling and bundle correlations with ammonia as a refrigerant.

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Pages : 11-21

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Détails

  • Titre original : Shell side direct expansion evaporation of ammonia on a plain tube bundle with inlet quality effect in the presence of exit superheat.
  • Identifiant de la fiche : 30022250
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 82
  • Date d'édition : 10/2017
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2017.05.031

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