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Achieving air-change effectiveness for Green Star IEQ-2 office design with CFD simulations: diffuser performance.

Author(s) : ALLISON C., NORTH B.

Type of article: Article, Case study

Summary

There has been a substantial motivation for building developers to apply for a Green Star rating under the Green Building Council of Australia's (GBCA) Green Star rating scheme. One category is the IEQ-2 demonstrating adequate air change effectiveness (ACE) at the design stage. For systems that are not of displacement ventilation type, this can only be demonstrated through computational fluid dynamics (CFD) modelling of the ventilation system and calculated in accordance with ASHRAE F25-1997 methodology. Extensive CFD modelling of actual case studies has produced some interesting findings regarding the current beliefs of designers to achieve ACE. In particular this relates to how the ceiling diffusers are modelled. There are currently no Green Star guidelines available to assist CFD modellers with how to correctly perform this. Therefore CFD studies are not compared on an equal basis. Also, the GBCA rating tool prescribes conditions which seem to achieve a contrary objective of the Green Star intention. In light of these shortcomings, it is suggested that there be a review of the current Green Star rating tool for the IEQ-2 credit.

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Format PDF

Pages: pp. 28-34 (6 p.)

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Details

  • Original title: Achieving air-change effectiveness for Green Star IEQ-2 office design with CFD simulations: diffuser performance.
  • Record ID : 2011-0290
  • Languages: English
  • Subject: Environment
  • Source: EcoLibrium - vol. 10 - n. 1
  • Publication date: 2011/02

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