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Transfert de chaleur lors de la condensation d'ammoniac dans les échangeurs de chaleur à mésocanaux refroidis à l'air.

Ammonia condensation heat transfer in air-cooled mesochannel heat exchangers.

Auteurs : CHIRIAC F., ILIE A., DUMITRESCU R., et al.

Résumé

A mathematical model is formulated in this paper for the prediction of the heat rejection rate, assuming that the total heat transfer area of the mesochannel condenser is made up of 2 different areas, corresponding to superheated vapour state and the two-phase flow state. Each of these areas is considered as an independent heat exchanger. The tested mesochannel condenser, manufactured by a Romanian company for automotive air-conditioning systems, is made of aluminium, based on an extrusion process; an oven brazing process was used for the headers to tubes joints. Maximum heat rejection rate represents the criteria used in order to optimise the geometrical configuration of the condenser. This theoretical study resulted in an optimised geometrical configuration of the mesochannel condenser. Experimental research has been carried out using a mesochannel condenser of optimised geometrical configuration. In order to ensure a quasi-state operating regime, the air-cooled mesochannel condenser was mounted inside an air loop, having multiple regulating and control means for the following parameters: inlet air dry bulb temperature, inlet air wet bulb temperature, inlet air flow rate. The authors of the paper develop a comparative analysis of theoretical vs. experimental heat rejection rate and heat transfer coefficient for an ammonia air-cooled mesochannel condenser.

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Format PDF

Pages : ICR07-B2-519

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    20 €

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    Gratuit

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Détails

  • Titre original : Ammonia condensation heat transfer in air-cooled mesochannel heat exchangers.
  • Identifiant de la fiche : 2008-0079
  • Langues : Anglais
  • Source : ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
  • Date d'édition : 21/08/2007

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