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Prévision et étude expérimentale des caractéristiques de transfert de chaleur et de masse d'un absorbeur à nappes de tubes horizontaux.

Prediction and experimental investigation of heat and mass transfer characteristics of a horizontal tube bundle adsorber.

Numéro : pap. n. 325

Auteurs : OLBRICHT M., LUKE A.

Résumé

One of the main obstacles in the design process of absorption chillers is the accurate prediction of the heat and mass transfer coefficients for all the heat exchangers. This refers especially for the absorber, where the lowest heat transfer coefficients are expected due to the coupled heat and mass transfer process during absorption. Appropriate correlations for the calculation of the heat and mass transfer coefficients of horizontal tube bundle absorbers are discussed by literature research in this work and are applied on the heat exchanger’s geometry of a self-designed and constructed absorption chiller. The correlations are discussed concerning their dependence on the solution mass flow rate and the considered physical properties. The results of the correlations are validated with experimental data of the self-designed absorption chiller. It is shown that the dependence of the heat transfer coefficient on the material properties is taken into account in the same way in all correlations. In contrast to this, there is no agreement in the correlations on which way the mass transfer is affected by the material properties. Due to different flow regimes in the film which are considered in particular correlations, no uniform influence of the solution mass flow rate on the heat and mass transfer is identified. Basically all correlation over estimate heat transfer coefficients or do not show the same dependence of the heat transfer coefficient on the solution mass flow rate compared to experimental data. Only the results of one of the correlations for heat transfer are suitable, but only for low solution flow rates.

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Pages : 8 p.

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Détails

  • Titre original : Prediction and experimental investigation of heat and mass transfer characteristics of a horizontal tube bundle adsorber.
  • Identifiant de la fiche : 30016189
  • Langues : Anglais
  • Source : Proceedings of the 24th IIR International Congress of Refrigeration: Yokohama, Japan, August 16-22, 2015.
  • Date d'édition : 16/08/2015
  • DOI : http://dx.doi.org/10.18462/iir.icr.2015.0325

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