Predicting contaminant removal effectiveness of three air distribution systems by CFD modeling

Summary

Presents a study comparing the contaminant removal effectiveness (CRE) of three air distribution systems by CFD modelling for a bar/restaurant setting. The air supply distributions and exhaust arrangement were modelled for a mixed air system, a directional air flow system and a displacement ventilation system. Determines the CRE of each space for both particulate and carbon monoxide dispersions under two different ventilation rates. Uses a commercial CFD software package to model a hypothetical restaurant with a bar in a steady state condition with the inclusion of objects such as a bar and multiple tables, heat sources such as people standing and seated, pollutant sources, and an exhaust air grille. Presents the results, which demonstrate that directional airflow systems reduce non-smokers' exposure to contaminants better than mixed air systems, and displacement ventilation systems reduced non-smokers' exposure to contaminants better than mixed air systems, and displacement ventilation systems reduce non-smokers' exposure better than both directional airflow and mixed air systems.

Primary Author(s): Hirnikel D J, Lipowicz, Lau R W

Source: ASHRAE Trans., 2002, vol.108, part 1, paper number 4532, 350-359, 4 figs, 3 tabs, refs.

             BSRIA Abstract Doc 000103821 Abs 20020791

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