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Document IIF

Coefficient de transfert de chaleur par condensation de vapeur d'eau dans de grands condenseurs refroidis par air à tube aplati.

Steam condensation heat transfer coefficient in large, flattened-tube steam condensers.

Numéro : pap. n. 898

Auteurs : DAVIES W., HRNJAK P.

Résumé

Steam condensation heat transfer coefficient (HTC) in a large, flattened tube with variable heat flux, wall temperature and inclination angle is determined experimentally. The condenser tube is that used in air-cooled condensers for power plants. The steel tube has an elongated-slot cross section with inner dimensions of 216 x 16 mm. Vapor and liquid flow concurrently through a 5.7 m long air-cooled conditioning section, and HTC is determined in a 0.12 m long water-cooled test section. Tube inclination angle is varied from 0 – 25° downwards. The long conditioning section creates conditions in the test section that mimic the conditions in an operating condenser – allowing for realistic development of flow regime and void fraction. HTC is then determined in the water-cooled section. Quality in this section ranges from 0 – 0.75. A visualization section allows determination of flow regime and void fraction. The flow is found to be stratified for all conditions. HTC is found to increase by 6-10 times along the condenser height.

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Pages : 8

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    20 €

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Détails

  • Titre original : Steam condensation heat transfer coefficient in large, flattened-tube steam condensers.
  • Identifiant de la fiche : 30026050
  • Langues : Anglais
  • Source : Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Date d'édition : 24/08/2019
  • DOI : http://dx.doi.org/10.18462/iir.icr.2019.0898

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