ANALYSIS ON THE WELL-MIXING ASSUMPTIONS USED IN MULTIZONE AIRFLOW NETWORK MODELS
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.
Multizone airflow models Indoor air quality Contaminant transport
Liangzhu (Leon) Wang Qingyan (Yan) Chen
School of Mechanical Engineering, Purdue University 585 Purdue Mall, Purdue University West Lafayette, IN 47907-2088, U.S.A.
国际会议
北京
英文
2007-09-03（万方平台首次上网日期，不代表论文的发表时间）