The Influence on the Limit Flow Ratio Caused by the Change of the Area of the Exhaust Hood Face in the Design of Push–Pull Ventilation
This study is to investigate whether the change of the exhaust hood area has an effect on the limiting flow ratio KL in an push–pull ventilation device, especially when the face area of the supply hood is larger than the exhaust hood. This research is based on experiment. Set up a push–pull ventilation device, change the area of the exhaust hood face under the condition of maintaining other factors unchanged. Determine the minimum exhaust volume which completely drains the given air supply without overflow by the tracer method, and the KL could be deduced. The experimental results show that under the above experimental conditions, the change of the exhaust hood area will cause a change on the limiting flow ratio KL, and the larger the gap between the supply and exhaust hood area, the greater the KL value will be. Change the distance between the push and pull hood face, repeat the above experiments, it is verified that the conclusions above are still valid when the distance changes.
KeywordsPush–pull Ventilation Area of the exhaust hood face Exhaust volume rate Flow ratio method
This study was supported by the National Key R&D Program of China, Grant No. 2016YFC0801700.
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