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Distribution massique de frigorigène dans une pompe à chaleur air/eau réversible : effet de la vitesse du flux d'air.

Refrigerant mass distribution in an invertible air-to-water heat pump: effect of the airflow velocity.

Auteurs : GUZZARDI C., AZZOLIN M., LAZZARATO S., DEL COL D.

Type d'article : Article de la RIF

Résumé

This paper presents the results of refrigerant mass distribution measurements carried out in an invertible air-to-water heat pump. The unit works with refrigerant R32 and produces a nominal cooling capacity equal to 60 kW. Experimental tests have been performed during both cooling and heating operations using the quick-closing valves technique to isolate the charge within the components of the system. A mathematical model, developed to predict the refrigerant charge in the heat exchangers of the heat pump and its performance, is described and validated. The model includes a physical description of the heat transfer mechanisms in the condenser and in the evaporator. The model employs void fraction correlations to calculate the refrigerant mass in the two-phase regions of the heat exchangers. In the finned coil heat exchanger, the model can account for the effects of the airflow maldistribution, which has been also experimentally measured. When the not uniform air velocity is considered, the refrigerant charge in the heat exchangers is modelled within ±10%. The results of the model showed that the airflow maldistribution can increase the total refrigerant charge in chiller mode by 12.7% and decrease the performance of the system by 11%, compared to the case of uniform air velocity.

Documents disponibles

Format PDF

Pages : 180-196

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 : Refrigerant mass distribution in an invertible air-to-water heat pump: effect of the airflow velocity.
  • Identifiant de la fiche : 30029622
  • Langues : Anglais
  • Sujet : Technologie
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 138
  • Date d'édition : 06/2022
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2022.03.006
  • Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.

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