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Considérations pour la ventilation naturelle et la qualité de l'environnement pour un centre de contrôle.

Ventilation considerations for indoor environmental quality for a control center.

Auteurs : ZHANG P.

Résumé

This paper presents design considerations of ventilation and indoor environmental quality (IEQ) for a control center. Raised access floors are extensively used to provide flexibilities for control cables and wires required by a control center. Underfloor air distribution system is more practice and economical than an overhead mixing system. It improves indoor ventilation effectiveness due to the air stratification of thermal plume, and it provides a better indoor environment for the equipment and occupied people. From the analyses and calculations for a control center, when the load density is less than 40 btuh/s.f., and the throw height of the floor panel diffuser is less than 4', the ventilation effectiveness is up to 1.2, similar to the displacement ventilation. When the load density is between 40 and 60 btuh/s.f., and the throw height of the floor panel diffuser is between 4' and 6', the stratification of thermal plume is still generated, the ventilation effectiveness is approximately 1.1. When the load density is over 60 btuh/s.f., the throw height of the floor panel diffuser is over 6'. Without the air stratified layer, the ventilation effectiveness is 1.0, equal to perfect mixing air distribution. In the high supply airflow rate situation, ventilation airflow for providing an acceptable IEQ around people should be maintained at least 10% of supply air, in order to provide at least 5 cfm fresh air for people who can obtain nearby.

Détails

  • Titre original : Ventilation considerations for indoor environmental quality for a control center.
  • Identifiant de la fiche : 2008-2702
  • Langues : Anglais
  • Source : Clima 2007. WellBeing Indoors. Proceedings of the 9th REHVA World Congress [CD-ROM + Abstract book].
  • Date d'édition : 10/06/2007

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