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Simulation de la dynamique et de la régulation d'un refroidisseur à absorption à double effet au LiBr-H2O.

Simulation of dynamics and control of a double-effect LiBr-H2O absorption chiller.

Auteurs : SHIN Y., SEO J. A., CHO H. W., et al.

Type d'article : Article

Résumé

A dynamic model has been developed to simulate dynamic operation of a real double-effect absorption chiller. Dynamic behaviour of working fluids in main components was modelled in first-order nonlinear differential equations based on heat and mass balances. Mass transport mechanisms among the main components were modelled by valve throttling, 'U' tube overflow and solution subcooling. The nonlinear dynamic equations coupled with the subroutines to calculate thermodynamic properties of working fluids were solved by a numerical method. The dynamic performance of the model was compared with the test data of a commercial medium chiller. The model showed a good agreement with the test data except for the first 83 min during which different flow rates of the weak solution caused some discrepancy. It was found that the chiller dynamics is governed by the inlet temperatures of the cooling water and the chilled water when the heat input to the chiller is relatively constant. For a step change of load at constant inlet temperatures of the cooling water and the chilled water, the response time of the chilled water exit temperature was about 15 min and it was due to the thermal capacities of the chiller. The dilution cycle was found to be an essential means for improvement of control performance as well as anticrystallization. [Reprinted with permission from Elsevier. Copyright, 2009].

Détails

  • Titre original : Simulation of dynamics and control of a double-effect LiBr-H2O absorption chiller.
  • Identifiant de la fiche : 2009-2030
  • Langues : Anglais
  • Source : Applied Thermal Engineering - vol. 29 - n. 13
  • Date d'édition : 09/2009
  • DOI : http://dx.doi.org/10.1016/j.applthermaleng.2009.01.006

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