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Experiment and CFD simulation on a push-pull local ventilation system in factories: capture efficiency of push-pull local ventilation and disturbance caused by general ventilation.

[In Japanese. / En japonais.]

Author(s) : KONDO Y., YOSHINO H., TANAKA T.

Type of article: Article

Summary

In working spaces, such as factories and commercial kitchens, it is very important to remove contaminants generated during operations locally and keep air quality healthy in breathing zones. The push-pull ventilation system is considered as an effective method under such conditions, therefore it has been widely used in Japan recently. The effectiveness of the local ventilation system is affected by the airflow around it. If the airflow between the push hood and the pull hood is disturbed by the ambient flow, such as air jets caused by air-conditioning system for the occupied space, the contaminants could not be captured and the air quality in the breathing zone would become worse. Push-pull local ventilation systems consist of two components: the push flow is generated by push hood that are blown across the contaminate source towards an exhaust hood, which pulls and removes the air containing the contaminant. In this paper, a full-scale experiment in a laboratory on push-pull ventilation system is presented. The distributions of airflow and pollutant concentration were discussed with the experimental results. Several factors were investigated, i.e. the velocity of push-air and pull-air, and the locations of contaminant sources. Then a large-scale factory was modelled and simulated by CFD simulation, and the interaction between the local ventilation and the general ventilation was studied. If the displacement ventilation system was used as the general ventilation, the airflow formed in the push-pull ventilation system was not be disturbed and the capture efficiency of it was excellent.

Details

  • Original title: [In Japanese. / En japonais.]
  • Record ID : 2005-0965
  • Languages: Japanese
  • Source: Transaction of the Society of Heating, Air-conditioning and Sanitary Engineers of Japan - n. 94
  • Publication date: 2004/07

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