
294 Industrial Air Quality and Ventilation
© 2010 Taylor & Francis Group, LLC
The following aerodynamic suction characteristic was obtained after processing
the results of the aerodynamic surveys:
• Capacity (m
3
/hr) 1,000–6,000
• Air velocity (m/s)
(a) In suction hole sections 8.8
(b) In the outlet ange 17.1
• Negative pressure inside cowl (Pa) 15
• Hydraulic resistance (Pa) 965
• Local resistance coefcient of the suction unit 5.5
Dust-laden air was prepared by a disc dust feeder and fed into the cowl through a
chute. Table 5.23 summarizes the survey ndings. The following conclusions can be
made using the data at hand:
TABLE 5.22