Document IIF
Frigorigènes purs : coefficients de transfert de chaleur lors d'écoulement en condensation.
Flow condensation heat transfer coefficients of pure refrigerants.
Auteurs : JUNG D., SONG K. H., CHO Y.
Type d'article : Article, Article de la RIF
Résumé
Flow condensation heat transfer coefficients (HTCs) of R12, R22, R32, R123, R125, R134a, and R142b were measured experimentally on a horizontal plain tube. The experimental apparatus was composed of three main parts; a refrigerant loop, a water loop and a water-glycol loop. The test section in the refrigerant loop was made of a copper tube with an outside diameter of 9.52 mm and 1 m length. The refrigerant was cooled by cold water passing through an annulus surrounding the test section. All tests were performed at a fixed refrigerant saturation temperature of 40 °C with mass fluxes of 100, 200, 300 kg m-2 s-1 and heat flux of 7.3-7.7 kW m-2. Experimental results showed that flow condensation HTCs increase as the quality and mass flux increase. At the same mass flux, the HTCs of R142b and R32 are higher than those of R22 by 8-34% while HTCs of R134a and R123 are similar to those of R22. On the other hand, HTCs of R12 and R125 are lower than those of R22 by 24-30%. Previous correlations predicted the present data satisfactorily with mean deviations of less than 20% substantiating indirectly the reliability of the present data. Finally, a new correlation was developed by modifying Dobson and Chato's correlation with an introduction of a heat and mass flux ratio combined with latent heat of condensation. The correlation showed a mean deviation of 10.7% for all pure halogenated refrigerants' data obtained in this study.
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Détails
- Titre original : Flow condensation heat transfer coefficients of pure refrigerants.
- Identifiant de la fiche : 2003-1731
- Langues : Anglais
- Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 26 - n. 1
- Date d'édition : 01/2003
Liens
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Indexation
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Thèmes :
CFC;
HCFC;
HFC;
Transfert de masse;
Ecoulement diphasique - Mots-clés : Écoulement diphasique; R134a; Coefficient de transfert de chaleur; Mesure; R32; R22; R142b; R125; R123; R12; Frigorigène; Condensation
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Flow condensation heat transfer coefficients (H...
- Auteurs : JUNG D., CHO Y., KIM S.
- Date : 17/08/2003
- Langues : Anglais
- Source : 21st IIR International Congress of Refrigeration: Serving the Needs of Mankind.
- Formats : PDF
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Prediction of heat transfer coefficients of var...
- Auteurs : JUNG D. S., RADERMACHER R.
- Date : 1991
- Langues : Anglais
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Nucleate boiling heat transfer coefficients of ...
- Auteurs : JUNG D., KO Y., AHN K.
- Date : 17/08/2003
- Langues : Anglais
- Source : 21st IIR International Congress of Refrigeration: Serving the Needs of Mankind.
- Formats : PDF
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Condensation in smooth horizontal tubes.
- Auteurs : DOBSON M. K., CHATO J. C.
- Date : 02/1998
- Langues : Anglais
- Source : J. Heat Transf. - vol. 120 - n. 1
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Prediction of evaporation heat transfer coeffic...
- Auteurs : JUNG D., RADERMACHER R.
- Date : 05/1993
- Langues : Anglais
- Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 16 - n. 3
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