Analysis on the well-mixing assumptions used in multizone airflow network models

Liangzhu Wang, Qingyan Chen

Research output: Unpublished conference presentation (presented paper, abstract, poster)Conference presentation (not published in journal/proceeding/book)Academic researchpeer-review

4 Citations (Scopus)


The well-mixing assumptions, uniform distributions of air temperatures and contaminant concentrations and neglect of air momentum effects in a zone, used in multizone airflow network models could cause errors in some cases. Through dimensional analysis of the published data from the literature, this study has found correlation between the errors and mixing levels. Our study concluded that the assumption of uniform air temperatures is not appropriate if the vertical non-dimensional temperature gradient is higher than 0.03. The assumption of uniform air momentum effects could fail when the airflow with a strong momentum effect cannot be totally dissipated. The assumption of uniform contaminant concentrations can be invalid unless the contaminant source in the zone is also a heat source and the associated Archimedes number is greater than 400.

Original languageEnglish
Number of pages6
Publication statusPublished - 2007
EventBuilding Simulation 2007, BS 2007 - Beijing, China
Duration: 3 Sept 20076 Sept 2007


ConferenceBuilding Simulation 2007, BS 2007


  • Contaminant transport
  • Indoor air quality
  • Multizone airflow models

ASJC Scopus subject areas

  • Computer Science Applications
  • Building and Construction
  • Architecture
  • Modelling and Simulation


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