Partager

Document IIF

Évaluer les états de fonctionnement pour le système de refroidisseur avec la régression de Cox.

Assessing operating statuses for chiller system with Cox regression.

Auteurs : FU F. W., HO W. T.

Type d'article : Article, Article de la RIF

Résumé

The coefficient of performance (COP) of chiller systems drops when their operating statuses change frequently and deviate from the conventional pair-up operation of chillers, pumps and cooling towers. This paper analyses the chance of having transitional and unconventional operating statuses when the operating variables vary. 12,541 sets of operating conditions were collected from a chiller system at 15 min intervals over 8 months. 1901 sets of transitional statuses and 1565 sets of unconventional statuses were identified. Cox regression models were developed to analyze the impacts of ambient variables, flow- and temperature-related operating variables on transitional statuses. The temperatures of water entering and leaving the condensers were significant variables influencing the chance of switching on/off an extra cooling tower. Survival curves suggested the throttling range of significant variables to identify the chance of transitional statuses causing a COP fluctuation. Minimizing unnecessary transitional and unconventional statuses increased the average system COP by 2.72%.

Documents disponibles

Format PDF

Pages : 182-193

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 : Assessing operating statuses for chiller system with Cox regression.
  • Identifiant de la fiche : 30025378
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 98
  • Date d'édition : 02/2019
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2018.10.028

Liens


Voir d'autres articles du même numéro (51)
Voir la source

Indexation