Abstract
Pollutant diffusion law in typical confined space is special. This paper studied an air condition carriage with crowded passengers. The law of CO2 diffusion was studied by CFD simulation method. The result shows that at the 1.7m height from the floor, CO2 concentration in the region away from return air inlet and near the end of carriage is significantly lower than that in the region near return air inlet and inner end of carriage. The pollutant CO2 concentration in the region near return air inlet and at the 1.1m height of the passengers’ seats of both sides in the carriage is overall higher than that in the region away from return air inlet and at the 1.1m height of the passengers’ seats of both sides in the carriage. The research provides the theoretical base for arranging measurement points to monitor contamination content and improving airflow in the confined space.
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