Résumé
This paper describes the results of experimental investigations of heat transfer and pressure drop during the condensation of the R134a and R404A refrigerants in pipe minichannels with internal diameters d = 0.31–3.30 mm. The results concern investigations of the local heat transfer coefficient and a pressure drop in single mini-channels. The results were compared with calculations according to the correlations proposed by other authors. Within the range of the examined parameters of the condensation process in mini-channels produced from stainless steel, it was established that the values of the heat transfer coefficient may be described with Akers et al. and Shah correlations within a limited range of the mass flux density of the refrigerant and the mini-channel diameter. A pressure drop during the condensation of these refrigerants is described in a satisfactory manner with Friedel and Garimella correlations. On the basis of the experimental investigations, the authors proposed their own correlation for the calculation of local heat transfer coefficient. [Reprinted with permission from Elsevier. Copyright, 2011].
Détails
- Titre original : Comparative investigations of the condensation of R134a and R404A refrigerants in pipe minichannels.
- Identifiant de la fiche : 30001809
- Langues : Anglais
- Source : International Journal of Heat and Mass Transfer - vol. 54 - n. 9-10
- Date d'édition : 04/2011
- DOI : http://dx.doi.org/10.1016/j.ijheatmasstransfer.2011.01.005
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