As researches on air delivery to air-conditioning room are turning from static mode to dynamic mode, especially the natural airflow simulation plan is being put forward, these, in turn, require more thorough understanding and more effective evaluation method of various airflow turbulence patterns. On the basis of large amount of carefully controlled measurements of air velocities which are generated in air-conditioning room, outdoor and by local fan, a detailed calculation and analysis has been made in the light of the rapidly developing nonlinear science - chaotic theory.
Conjunction of Multizone Infiltration Specialists (COMIS) is a model that can be used to simulate air flow and pollutant patterns in a multizone structure. Experimental data from air flow measurements in single sided naturally ventilated spaces, common in urban environments, and from cross-ventilated spaces, are compared against predictions from COMIS. The single sided ventilation experiments were performed in a full scale building and a test cell, which led to the definition of a correction factor for COMIS.
Natural night-time ventilation is often used to pre-cool low energy buildings, but can lead to security risks and weather damage. A prototype night ventilator has been built to combat such problems, but how has it performed in field tests?
This paper presents an investigation into natural ventilation in the field of computational fluid dynamics using in particular rather rough mesh cells. The CFD results were then compared to the wind tunnel results obtained by Gouin at the Centre Scientifique et Technique du Batiment ( CSI'B) in Nantes. The role of eaves, and that of window configuration on windward and leeward sides of buildings was also investigated to search for a better interior airflow.
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