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Document IIF

Modélisation d'un évaporateur à film tombant pour refroidisseurs à adsorption.

Modelling of a falling-film evaporator for adsorption chillers.

Auteurs : APRILE M., DI CICCO A. J., TOPPI T., FRENI A., MOTTA M.

Type d'article : Article de la RIF

Résumé

The objective of the present study was to develop a dynamic model to simulate a prototype falling-film evaporator that is part of a single-bed adsorption chiller test bench located at the Department of Energy of the Politecnico di Milano. The model is based on the evaporator energy and mass balances and was calibrated and validated using experimental data coming from realistic operating conditions in a range of inlet chilled water temperatures () from 15 to 25°C. From the experimental data, it was obtained that the average overall heat transfer conductance () was approximately 530 W/K for all temperatures during the quasi steady-state section of the process. A correlation to calculate the wetted surface through a variable called wettability factor () was developed from experimental data. The factors were identified using the model and were in the range of 0.80 – 0.20 (= 15°C) and 0.60 – 0.20 (= 25°C). It was seen that, the higher the , the lower the values. The and saturation temperature () values from the model were in good accordance with experimental data during the quasi steady-state section of the process. Nevertheless, the final transition stage (i.e., a situation in which the evaporator's refrigerant pool is empty) required an additional hypothesis due to the uncertain process’ dynamics. The mass and energy balances that are part of the hydrodynamics and heat transfer sections of the model use Nusselt's classic theory for falling-film.

Documents disponibles

Format PDF

Pages : 471-482

Disponible

  • Prix public

    20 €

  • Prix membre*

    Gratuit

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

Détails

  • Titre original : Modelling of a falling-film evaporator for adsorption chillers.
  • Identifiant de la fiche : 30030926
  • Langues : Anglais
  • Sujet : Technologie
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 146
  • Date d'édition : 02/2023
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2022.12.009

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