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Document IIF

Transfert de chaleur par condensation en tube et chute de pression pour le R454B et le R32 : substituts potentiels au R410A.

In tube condensation heat transfer and pressure drop for R454B and R32—Potential replacements for R410A.

Auteurs : JAJJA S. A., NAWAZ K., FRICKE B. A.

Type d'article : Article de la RIF

Résumé

The heating, ventilation and air conditioning (HVAC) industry in the United States seeks near-term alternative refrigerants to replace R-410A in unitary equipment. Two potential replacement refrigerants are R-454B and R-32. It is of interest to investigate the capability and accuracy of existing heat exchanger design methods when applied to these replacement refrigerants. To that end, this work presents empirical condensation quasi-local heat transfer coefficient and pressure drop data for R-454B and R-32. These data were obtained in a in. (9.52 mm) outside diameter (OD) smooth copper tube with a wall thickness of 0.032 in. (0.81 mm). The experimental variables and their ranges included refrigerant absolute pressure ( kPa), condensation temperature ( oC), mass flux ( kg m-2 s-1), vapor quality (), and heat flux ( kW m-2). It was found that the heat transfer correlation developed by Cavallini et al. Cavallini et al. (2006) predicted the experimental condensation heat transfer data, for both R-454B and R-32, with the greatest accuracy. Using the Cavallini et al. correlation, it was found that the mean absolute percentage error (MAPE) was 10.5% and 15.1% for R-454B and R-32, respectively. Additionally, the pressure drop correlation developed by Friedel Friedel (1979) predicted the experimentally determined pressure gradient with a MAPE of 7.7% and 5.5% for R-454B and R-32, respectively. These results will assist the practicing thermal engineer to choose the most appropriate design correlation for these near-term replacement refrigerants.

Documents disponibles

Format PDF

Pages : 238-253

Disponible

  • Prix public

    20 €

  • Prix membre*

    Gratuit

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : In tube condensation heat transfer and pressure drop for R454B and R32—Potential replacements for R410A.
  • Identifiant de la fiche : 30030451
  • Langues : Anglais
  • Sujet : Alternatives aux HFC
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 144
  • Date d'édition : 12/2022
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2022.07.019

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