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Étude expérimentale de l'ébullition en écoulement de l'ammoniac dans un faisceau de tubes verticaux : Partie 3 : Tube nervuré amélioré avec une tige ronde et solide aux 2/3 de sa longueur en PVC non conducteur.

Experimental study of ammonia flow boiling in a vertical tube bundle: Part 3 – Enhanced dimple tube with 2/3rd height solid round PVC nonconductive rod.

Auteurs : AYUB Z., ABBAS A., ISMAIL T., AYUB A., LI W., KHAN T. S., RIBATSKI G.

Type d'article : Article de la RIF

Résumé

This paper presents the experimental results of saturated two-phase flow ammonia in a vertical shell and tube heat exchanger comprising of seven dimpled enhanced tubes with solid PVC nonconductive round rods inserted in the lower 2/3rd section of each tube creating 67% annular section. The source of heat was hot ethylene glycol/water solution flowing on the shell side. The range of saturation temperature for ammonia was -20 °C ≤ ≤ -2 °C, heat flux range 5 kW m−2 ≤ ≤ 45 kW m−2, exit vapor quality range 0.1 ≤ x ≤ 0.9 and mass flux 76.9 kg m−2 s−1≤ G ≤ 145.7 kg m−2 s−1. For each saturation temperature, the effects of heat flux and mass flux were studied while the exit vapor quality at each mass flux varied between 0.1 and 0.9. Around 40% increase in heat transfer performance was observed with saturation temperature between –20 and –2 °C at exit vapor quality of 0.7. Heat transfer performance also increased with heat flux at fixed mass flux at each saturation temperature while the performance showed initial increase with quality and then a drop at the onset of dry out.

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Format PDF

Pages : 64-73

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Détails

  • Titre original : Experimental study of ammonia flow boiling in a vertical tube bundle: Part 3 – Enhanced dimple tube with 2/3rd height solid round PVC nonconductive rod.
  • Identifiant de la fiche : 30029327
  • Langues : Anglais
  • Sujet : Technologie
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 134
  • Date d'édition : 02/2022
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2021.11.006
  • Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.

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