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Charge frigorifique et chute de pression pendant l'ébullition des frigorigènes R134a et CO2 dans les échangeurs de chaleur à microcanaux.

Refrigerant charge and pressure drop during boiling of R134a and CO2 refrigerants in minichannel heat exchangers.

Auteurs : MACCHI H., JABBOUR O., VIASIE C., et al.

Résumé

In the future, refrigeration and air-conditioning practitioners will face the following challenges: adapting replacement refrigerants, improving containment, reducing refrigerant fluid charge, achieving better energy efficiency, increasing reliability and reducing costs. So more compact and lighter heat exchangers have been developed and have led to real gains in terms of cost, efficiency and charge. Among compact heat exchangers, the authors focus on the minichannel technology that seems able to reduce the total system charge by about 30 to 60% compared with conventional exchangers. The paper presents simulation results of refrigerant fluid charge and pressure drop within minichannel evaporators for both R134a and CO2 refrigerants. Different minichannel evaporators were studied. The importance of selecting appropriate void fraction and pressure drop correlations is discussed. The study was carried out on an evaporator of a typical air-conditioning car system with 5 kW refrigerating capacity at a 5 °C saturation temperature.

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Détails

  • Titre original : Refrigerant charge and pressure drop during boiling of R134a and CO2 refrigerants in minichannel heat exchangers.
  • Identifiant de la fiche : 2005-0064
  • Langues : Anglais
  • Source : Mobile air conditioning. International IIR Workshop.
  • Date d'édition : 20/06/2002

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