Evaluation of some assumptions used in multizone airflow network models

Liangzhu (Leon) Wang; Qingyan Chen

doi:10.1016/j.buildenv.2007.10.010

Evaluation of some assumptions used in multizone airflow network models

Liangzhu (Leon) Wang, Qingyan Chen

Department of Building Environment and Energy Engineering

Research output: Journal article publication › Journal article › Academic research › peer-review

84 Citations (Scopus)

Abstract

Multizone airflow network models assume that in a zone air temperature and contaminant concentrations are uniform, and air momentum effects are neglected. These assumptions could cause errors for airflow with strong buoyancy, large contaminant concentration gradient, or strong momentum. This study has found the correlations of the errors and some dimensionless air parameters. The assumption of uniform air temperature is acceptable when the dimensionless temperature gradient is smaller than 0.03. The assumption of uniform contaminant concentration is valid if the corresponding Archimedes number for the source zone is greater than 400. The assumption of neglecting air momentum effect is reasonable when the jet momentum effect is dissipated before reaching an opening in downstream.

Original language	English
Pages (from-to)	1671-1677
Number of pages	7
Journal	Building and Environment
Volume	43
Issue number	10
DOIs	https://doi.org/10.1016/j.buildenv.2007.10.010
Publication status	Published - Oct 2008

Keywords

Air distribution
Contaminant transport
Dimensional analysis
Multizone airflow model
Well-mixing assumption

ASJC Scopus subject areas

Environmental Engineering
Civil and Structural Engineering
Geography, Planning and Development
Building and Construction

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10.1016/j.buildenv.2007.10.010

Cite this

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N2 - Multizone airflow network models assume that in a zone air temperature and contaminant concentrations are uniform, and air momentum effects are neglected. These assumptions could cause errors for airflow with strong buoyancy, large contaminant concentration gradient, or strong momentum. This study has found the correlations of the errors and some dimensionless air parameters. The assumption of uniform air temperature is acceptable when the dimensionless temperature gradient is smaller than 0.03. The assumption of uniform contaminant concentration is valid if the corresponding Archimedes number for the source zone is greater than 400. The assumption of neglecting air momentum effect is reasonable when the jet momentum effect is dissipated before reaching an opening in downstream.

AB - Multizone airflow network models assume that in a zone air temperature and contaminant concentrations are uniform, and air momentum effects are neglected. These assumptions could cause errors for airflow with strong buoyancy, large contaminant concentration gradient, or strong momentum. This study has found the correlations of the errors and some dimensionless air parameters. The assumption of uniform air temperature is acceptable when the dimensionless temperature gradient is smaller than 0.03. The assumption of uniform contaminant concentration is valid if the corresponding Archimedes number for the source zone is greater than 400. The assumption of neglecting air momentum effect is reasonable when the jet momentum effect is dissipated before reaching an opening in downstream.

KW - Air distribution

KW - Contaminant transport

KW - Dimensional analysis

KW - Multizone airflow model

KW - Well-mixing assumption

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DO - 10.1016/j.buildenv.2007.10.010

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JO - Building and Environment

JF - Building and Environment

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ER -

Evaluation of some assumptions used in multizone airflow network models

Abstract

Keywords

ASJC Scopus subject areas

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