Daikin VAM-FA8VE Technical Data Manual page 266

2
11
264
• HRV • VKM-GA(M)V1
2. Using the duct's friction resistance diagram
Friction resistance diagram for round duct (galvanized steel pipe)
0.04 0.1 0.2 0.4 1.0
1000000
800000
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0.04 0.1 0.2 0.4 1.0
Friction loss factor γ [Pa/m]
Friction Resistance Diagram for Duct
<How to use the diagram>
(Conditions)
•
A ventilating fan intended for use with a ducted system should be chosen.
•
Required air flow : 300 m
•
Duct diameter : φ15 cm
•
Duct length : 5 m
A
300
B
0 2.2
1. Find the intersection
of the duct diameter d (15 cm) and air flow Q (300
3
m /h) => Point A
2. Draw a vertical line through Point A until it intersects
with the abscissa => Point B
3. Read the Point B (2.2 Pa/m for this case). Multiply
the value by the duct length. The answer is 11 Pa.
• HRV • Heat Reclaim Ventilation
2.0 6.0 10 20 40 60 80
2.0 6.0 10 20 40 60 80
3
/h
Friction loss factor γ [Pa/m]