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The effect of return air path on achieving air-change effectiveness for Green Star IEQ-2 office design using CFD simulations.

Author(s) : ALLISON C., BROWN S.

Type of article: Article

Summary

There has been a substantial demand 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) in the design stage. For the design assessment, 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, as well as the design return air path. There are currently no Green Star guidelines available to assist CFD modellers with how to correctly perform this. Also, the GBCA rating tool prescribes conditions that seem to achieve a contrary objective of the Green Star intention. For example, the measuring of ACE at minimum turndown ratios in a variable volume system. 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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Pages: pp. 30-35

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Details

  • Original title: The effect of return air path on achieving air-change effectiveness for Green Star IEQ-2 office design using CFD simulations.
  • Record ID : 2010-1593
  • Languages: English
  • Source: EcoLibrium - vol. 9 - n. 7
  • Publication date: 2010/08

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