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TECHNICAL INFORMATION
 
 
Fan System Calculation and Design
•  GENERAL FACILITY RENEWALS

Number of renewals/hour, recommended depending on the type of facility

(DIN 1946 standard)

Type of facility/establishment   Renewal/hour     Type of facility/establishment   Renewal/hour
Wardrobes  
4-6
 Laundries  
10-20
Auditoriums  
6-8
 Accumulator buildings  
5-10
Classrooms  
5-7
 Airbrushing facilities  
10-20
Libraries  
4-5
 Paint stripping facilities  
5-15
Painting cabins  
25-50
 Offices  
4-8
Strongrooms  
3-6
 Swimming pools  
3-4
Cinemas, Theatres  
5-8
 Dipping baths  
0-80
Domestic kitchens  
15-25
 Restaurants - Casinos  
8-12
Commercial kitchens  
15-30
 Conference rooms  
6-8
Bathrooms  
5-7
 Waiting rooms  
4-6
Meeting rooms  
6-8
 Photocopy rooms  
10-15
Showers  
12-25
 Machine rooms  
10-40
Foundries  
8-15
 Meeting rooms  
5-10
Garages  
6
 Workshops (high level of disturbance)  
10-20
Gymnasiums  
4-6
 Workshops (low level of disturbance)  
3-6
Rooms  
3-8
 Assembly workshops  
4-8
Domestic lavatory  
4-5
 Solder workshops  
20-30
Public/industrial lavatory  
8-15
 Shops  
4-8
Laboratories  
8-15
 Dry cleaners  
5-15
Rolling mills  
8-15
 Changing rooms  
6-8
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•  AIRFLOW CALCULATION IN FARMS

Recommended airflow per animal, depending on the type of breed.

 
 
m3/h per breed
Type
Age or Weight
Summer
Winter
Poultry fattening
Chicks 1 to 7 days old
1-3
0.1-0.2
Poultry fattening
Chicks 1 to 7 weeks old
5-8
0.2-0.3
Poultry fattening
Chicks more than 7 weeks old
8-10
0.3-0.5
Laying hens  
1 a1.5 kg
 
8-10
  
0.3-0.5
Laying hens
1.5 to 2 kg
9-12
0.3-1
Laying hens
2 to 3 kg
12-15
0.5-2
Laying hens
-
10-15
0.5-2
Piglets
5 kg
8
4
Piglets
10 kg
16
5
Piglets
15 kg
24
6
Piglets
20 kg
32
7
Piglets
25 kg
40
8
Fattening pigs
25 kg
30
4
Fattening pigs
30 kg
36
5
Fattening pigs
40 kg
48
6
Fattening pigs
50 kg
60
7
Fattening pigs
60 kg
72
9
Fattening pigs
70 kg
84
10
Fattening pigs
80 kg
96
11
Fattening pigs
90 Kg
108
13
Fattening pigs
100Kg
120
14
Sows
Post-weaning
180
17
Sows
Mating
240
23
Sows
Gestating
250
25
Sows with litter
10 litter
375
28
Boars
-
360
36
Calves
3 weeks
50
5-10
Calfs
2 weeks
100
10-25
Fattening cattle
-
150
15-50
Cattle
-
175-200
40-60
Fattening sheep
From 20 to 25 Kg
90-100
10-15
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•  DUCT DESIGN AIDS

punto 3.1 Designing elbow joints

punto 3.2 Designing elbow joints with lateral joints

punto 3.3. Designing the fan air inlet

punto 3.4. Designing changes in duct cross section

punto 3.5. Designing outlets with a chimney

punto 3.6. Types of suction extractor hoods

punto 3.7. Examples of optimal air inlets in facilities

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•  LOAD LOSS COEFFICIENTS IN DUCTS AND ACCESSORIES

These coefficients are used to calculate the loss of load using the dynamic pressure method.

This method is based on the fact that all of the load losses, due to friction in ducts and strength due to parts coming away in accessories depend on the dynamic pressure, and can be calculated by multiplying the dynamic pressure by a friction loss factor.

To obtain the dynamic pressure the following formula should be applied:

Formual 01

Where V is the velocity at which the air flows in the duct.

punto 4.1. Loss coefficients in extractor hoods

punto 4.2. Loss coefficients in inlets

punto 4.3. Loss coefficients in elbow joints

punto 4.4. Loss coefficients in joints

punto 4.5. Loss coefficients in cowls

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•  INTAKE VELOCITIES

The intake velocity is the minimum air velocity caused by the hood required to collect the air and carry the contaminating fluid towards it. The air velocity achieved depends on the sucked airflow and the surface area of the extractor hood.

Examples of airflow calculations depending on the distance between the extractor hood and the contaminating fluid:

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•  CARRYING VELOCITIES

The carrying velocity of different materials depends on their size, density and the form of the material (Dalla Valle)

6.1. Vertical ascent velocity:

Formual 02

 

6.2 Horizontal movement velocity:

Formula 03

V = Velocity, m/s

s = Density of the material.

d = Mean diameter of largest particle, mm.

6.3 Load loss through mixture friction:

Formula 04

Fm = Load loss through mixture friction:

Fa = Air load loss

Ws = Solid mass

Wa = Air mass

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•  RECOMMENDED VELOCITIES FOR VENTILATION SYSTEMS

Function type
  
Public buildings (m/s)
  
Industrial plants (m/s)
 
Outside air intake  
2,5-4,5
  
5-6
Air cleaners  
2,5
  
2,5-3,0
 
Fan heater connection  
3,5-4,5
  
5-7
Main ducts  
5,0-8,0
  
5-12
 
Derivations and ascending branches  
2,5-3,0
4,5-9,0
Registers and supply grilles  
1,2-2,3
-
 
Supply openings  
-
1,5-2,5
Supply grilles near to floor  
0,8-1,2
-
 
Ascending tubes  
2,5-3,0
45-9,0
Main ducts  
4,5-8,0
6-12
 
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•  CYCLONE SEPARATORS

STANDARD MEASUREMENTS FOR CYCLONE SEPARATORS

CYCLONE SEPARATION FACTOR (S)

V = Tangential velocity

r = Radius of the cyclone = A / 2

g = Earth gravity acceleration

CYCLONE SEPARATORS
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Ctra. de Berga, Km 0,7 - 08580 Sant Quirze de Besora · (Latitude: 42º05’56” N - Length: 02º12’33” W) · BARCELONA · Tel.: 34 938 529 111 - Fax: 34 938 529 042
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