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Applicabilité d'un échangeur de chaleur à tubes nus bifurqués dans un système à débit de frigorigène variable (VRF) hybride utilisant de l'eau.

Applicability of a bifurcated bare-tube heat exchanger in water-based hybrid VRF system.

Numéro : pap. 2518

Auteurs : HUANG Z., HUANG R., LING J., et al.

Résumé

A water-based hybrid variable refrigerant flow (hVRF) system is a combination of traditional VRF system and water chiller system. Instead of using refrigerants in indoor units, hVRF system utilizes water (or any heat transfer fluid) as working fluid in indoor units. Compared with traditional VRF system, it has the advantages of reduced refrigerant charge, wider selection of refrigerants in terms of flammability and maintenance cost. However, the system COP of hVRF system is slightly lower than conventional VRF system due to single phase heat transfer in indoor coils. Therefore, current study proposes a bifurcated bare-tube heat exchanger (bBTHX) for indoor coils and investigates its applicability in hVRF system to increase the system efficiency. System model was developed for both traditional VRF system and the hVRF system. Results show that the bBTHX has 60% less total pumping power, 65% smaller volume and 70% smaller package- and material-volume than those of traditional fin-and-tube heat exchanger when delivering the same capacity and similar system COP. Simulation results also show that the system charge of hybrid VRF system with R-290 and R-600a are 28% and 27%, respectively lower than that of R-410A hybrid VRF system. Overall, the bBTHX shows a potential applicability as indoor coils for water-based hVRF systems with less refrigerant charge and flexibility of using flammable refrigerants.

Documents disponibles

Format PDF

Pages : 10

Disponible

  • Prix public

    20 €

  • Prix membre*

    15 €

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

Détails

  • Titre original : Applicability of a bifurcated bare-tube heat exchanger in water-based hybrid VRF system.
  • Identifiant de la fiche : 30024594
  • Langues : Anglais
  • Source : 2018 Purdue Conferences. 17th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Date d'édition : 09/07/2018

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