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INDUSTRIAL VENTILATION DUST COLLECTION SYSTEM DESIGN

SAMPLE HOOD CALCULATION

 

 

Given ;    
     
Hood Type : Cone Hood    
Hood Size : Width :1 ft Length:1.5 ft    
Operation:,intermittent container filling ,low speed    
Dust Distance to Hood (X) : 1,25 ft    
Duct Size :1 ft diameter round duct    
     
To Find    
Required minumum air volume ,Q    
Duct Static Pressure ,SPh    
Duct Air Velocity    
     
   
     
1-Our formula for requiered air volume Q from Table    
Q=V(10*X2+A)    
     
V= Capture Velocity : 200 fpm from Table, (1 m/sn)    
     
Q=200(10*1.25*1.25+1*1,5)=3425 cfm (5754 m3/h )    
Vh=Hood Velocity= 5754 /1*1.5=3830 fpm    
Vd=Duct Velocity =Q/Ad    
Ad :Duct Area Ad=3,14(0,5*0,5) =0,785 ft2    
     
Vd=3425 cfm/0,785=4363 fpm (22,1 m/sn)    
     
PSh :Reqired Duct Static Pressue    
Ce =Duct entry loss : 0,9 from table    
     
SPh=(Q/(A*4005*Ce))**2 (SQR)    
SPh=(3425/0,785*4005*0,9)**2    
SPh=1,46 in (37 mmSS) +%25 safety    
Sph=1,82 in (46 mmSS ) selected.    
This is the static pressure at the duct entry point to hood    
     
     

 
Capture Velocity V fpm Air velocity at any point in front of the hood or at the hood opening ,neccesary to capture the contaminated air at that poinby causing it to flow into the hood.
       
Face Velocity Vf fpm Air velocity at the hood opening
       
Slot Velocity Vs fpm Air velocity through the openings in a slot type hood
       
Plenum Velocity Vp fpm Air velocity in the plenum
       
Duct Velocity Vd fpm Air velocity through the duct after hood.
       
Transport Velocity Vt fpm Minumum air velocity through the duct required to move particules in air stream.
       
Dust Distance X ft Distance outward along center axes of hood.
       
Air Flow Q cfm Required minumum air flow to capture dust particles
       
Area A ft2 Area of hood opening
       
Diameter D ft Diameter of round hoods

 

Dust Exhaust System Hood Design

 

Dust Explosions
A dust explosion is very similar to a gas or vapour cloud explosion, i.e. when a volume of a flammable mixture is ignited, resulting in a rapid pressure increase and fire moving through the cloud. A dust explosion occurs when a combustible material is dispersed in the air forming a flammable cloud and a flame propagates through it. This of course also depends on the supply of oxygen to the fire, and the concentration of the fuel, if either of these are in too high or low then the explosion will not occur.

 

 

 
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