Study Of The Distribution Of Carbon Dioxide In Vortex Ventilation

Indoor air quality is increasing recognized as an essential factor for our overall level of health and comfort. Poor indoor air quality will lead to many syndromes. According to a survey, bad ventilation effect is the main reason leads to a low indoor air quality. However, only increasing fresh air quantity requires more capital and has a limited effect. Therefore, It is necessary to find a reasonable ventilation mode. People have done a lot of researches on mixing and displacement systems, but rarely been engaged in vortex ventilation. General study has not been made on it, especially on its effectiveness and subjective evaluation.For the first time, vortex ventilation is the clew throughout this study. Ventilation function and tracer-gas decay theory are applied to design the experiment. In the experiment, velocity and carbon dioxide concentration are measured and carbon dioxide time-levels in different experimental cases are obtained. Also, the effect of moving people in experimental room on contaminant field is analyzed and subjective feelings are investigated. Moreover, computer fluid mechanics has been used to simulate experimental condition. It has been found that simulated results are in good agreement with experimental results. Airflow distribution and contaminant removing capability in different cases are compared and some suitable ventilation modes are suggested. Moreover, simulation of vortex ventilation with electrical floor heating has also been made and the results could be used as an essential reference in life.