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Modélisation de l'inventaire précis des charges pour les systèmes de conditionnement d'air monoblocs.

Accurate charge inventory modeling for unitary air conditioners.

Auteurs : HARMS T. M., GROLL E. A., BRAUN J. E.

Type d'article : Article

Résumé

Charge inventory, the accounting of the distributed fluid mass in closed systems, is necessary in order to predict system performance under different environmental conditions for a given charge. Public domain simulation models used to predict unitary equipment performance are currently unable to accurately determine charge inventory. Sources of error in these models include incomplete internal volume accounting, neglected refrigerant-oil diffusion effects, and void fraction modelling assumptions. The results presented here suggest that the most important charge inventory issue is proper void fraction determination. The Baroczy void fraction correlation gave the best agreement with measured data for three unitary air conditioners. As the condenser holds by far the largest percentage of the total charge, accurate prediction of heat transfer and pressure drop in the condenser was found to be necessary for charge inventory modelling.

Détails

  • Titre original : Accurate charge inventory modeling for unitary air conditioners.
  • Identifiant de la fiche : 2004-2432
  • Langues : Anglais
  • Source : HVAC&R Research - vol. 9 - n. 1
  • Date d'édition : 01/2003
  • Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.

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