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Caractéristiques de transfert de chaleur et de chute de pression à l'intérieur de tubes ovales plats en aluminium.
Heat transfer and pressure drop characteristics for flat oval aluminium tubes.
Auteurs : SCHNEIDER P., MADSEN K. B., ESPEDAL A., et al.
Résumé
The paper presents measurements of the heat transfer during condensation and evaporation inside two flat oval tubes. The working fluids are R410A and R717. Flat oval tube-in-fin heat exchangers for air-to-refrigerant operation with different geometrical configurations were investigated under a variety of conditions. The tube refrigerant used is water. Parallel to the heat transfer investigation, pressure drop investigations were performed on the single tube as well as on the heat exchanger. The test results for the single tubes were compared with different heat transfer and pressure drop models. The models are based on circular tubes. The models showed good agreement with measurements. The Friedel correlation for pressure drop calculation can be recommended and Shah's correlation to calculate the heat transfer coefficient during evaporation can also be recommended for flat oval tubes. For condensation Aker's correlation can be used to calculate the heat transfer coefficient. A comparison for heat exchangers with round tube and fins showed that heat exchangers with a flat oval tube give lower fan power and better thermal performance.
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Détails
- Titre original : Heat transfer and pressure drop characteristics for flat oval aluminium tubes.
- Identifiant de la fiche : 2004-1089
- Langues : Anglais
- Source : 21st IIR International Congress of Refrigeration: Serving the Needs of Mankind.
- Date d'édition : 17/08/2003
Liens
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Indexation
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Thèmes :
Evaporateurs, condenseurs et autres échangeurs thermiques;
Transfert de masse;
Ammoniac;
Circulation du fluide : tuyauterie, régulation, automatisme, sécurité;
Mélanges - Mots-clés : R410A; Calcul; Transfert de masse; Tube elliptique; Transfert de chaleur; Ammoniac; Évaporation; Condensation; Chute de pression
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EVAPORATOR MODELS FOR OPERATION WITH DRY, WET, ...
- Auteurs : OSKARSSON S. P., KRAKOV K. I., LIN S.
- Date : 1990
- Langues : Anglais
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EVAPORATOR MODELS FOR OPERATION WITH DRY, WET, ...
- Auteurs : OSKARSSON S. P., KRAKOV K. I., LIN S.
- Date : 1990
- Langues : Anglais
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- Auteurs : FILIPPINI S., MERLO U.
- Date : 07/05/2009
- Langues : Anglais
- Source : 3th Conference on Ammonia Refrigeration Technology. Proceedings: Ohrid, North Macedonia, May 7-9, 2009.
- Formats : PDF
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Generic dynamic model for heat exchangers.
- Auteurs : XUAN S., AUTE V., RADERMACHER R.
- Date : 17/07/2006
- Langues : Anglais
- Source : 2006 Purdue Conferences. 18th International Compressor Engineering Conference at Purdue & 11th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
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- Auteurs : CAVALLINI A.
- Date : 2003
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- Source : Annual proceedings of the Institute of Refrigeration. 2003-2004 [CD-ROM].
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