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Caractéristiques de distribution de frigorigène dans un collecteur horizontal avec des trous d’embranchement de 0,3 mm de diamètre.

Refrigerant-distribution characteristics of a horizontal header with branch holes of 0.3 mm in diameter.

Numéro : pap. n. 488

Auteurs : ENDOH K.

Résumé

To improve heat-exchange performance, heat exchangers with channels with inner diameter of less than 0.5 mm have been studied. However, there is no knowledge about the distribution of vapor-liquid two-phase refrigerant. Therefore, the effect of inflow configuration of a horizontal header (channel cross-section: 0.7 x 0.7 mm2) with branch holes (inner diameter: 0.3 mm; number of holes: 10) arranged vertically downward was experimentally evaluated. The results of the evaluation demonstrate that dimensionless standard deviation of refrigerant distributed in the present header with a one-side inflow configuration is 10%. The effect of mass flux at the header inlet on the distribution for the one-side inflow configuration is small but that for the both-side inflow configuration is large. Moreover, the dimensionless standard deviation for the present header (10%) is much smaller than that for a conventional header (65%) with 13-times-bigger hydraulic diameter.

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Pages : 8

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Détails

  • Titre original : Refrigerant-distribution characteristics of a horizontal header with branch holes of 0.3 mm in diameter.
  • Identifiant de la fiche : 30026424
  • Langues : Anglais
  • Source : Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Date d'édition : 24/08/2019
  • DOI : http://dx.doi.org/10.18462/iir.icr.2019.0488

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