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Design considerations for roof-mounted ventilation systems.

Author(s) : SYRIOS K., HUNT G. R.

Type of article: Article

Summary

This article presents a methodology for determining the air flow rate through a stack-ventilated single-spaced enclosure bearing a roof-mounted ventilation tower. The authors developed a 'system discharge coefficient' which takes into account the pressure losses that occur at the intake opening of the enclosure, inside the tower and at the outlet opening. The system discharge coefficient was interpreted as a reduction in the area of the path that the air flow takes. Based on this reduced area the air flow rate was then determined. The proposed methodology may be applied to a broad range of ventilation tower geometries which house typical components. The article illustrates how to apply this technique, by determining the volume flow rate through a tower connected to a ventilated space; the tower houses a number of common components, e.g. insect screens, acoustic baffles and louvers. For each component, the pressure losses and the relevant resistance coefficients are presented and the most 'pressure consuming' components identified. Once identified, their design may then be altered so as to improve air flow rates.

Details

  • Original title: Design considerations for roof-mounted ventilation systems.
  • Record ID : 2005-0922
  • Languages: English
  • Source: Int. J. Vent. - vol. 3 - n. 2
  • Publication date: 2004/09

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