Daikin VAM-FA8VE Technical Data Manual page 268

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• HRV • VKM-GA(M)V1
The right column of Table A shows
the duct diameter equivalent to this
pressure loss of the local feature.
Note that the values shown in the
table are for λ = 0.018. For other
values of the friction resistance coefficient (λ) to be used, use the following equation to find appropriate
conversion.
Table A
No. Name
1 R bend, round duct
2 Straight bend, round duct
3 R bend, rectangular duct
4 Straight bend, rectangular duct
5 Pipe inlet (with round hood)
Pipe inlet
6
(with rectangular hood)
(Example)
IV
III
Ventilating fan intended for
0.5m
use with a ducted system
I
(For galvanized steel pipe with λ = 0.02, approximate value)
• HRV • Heat Reclaim Ventilation
le : equivalent straight pipe length of partial resistance...[m]
ζ
d : straight pipe diameter................................................ [m]
le =
d
λ ζ : Local loss coefficient
Sketch
H/W
d
–
R
d
–
0.25
0.5
W
R
H
1.0
4.0
0.25
0.5
W
1.0
H
4.0
θ
θ
V
θ
θ
V
V
VI
5m External hood
0.5m
(equivalent straight pipe length 9m)
Duct diameter φ100
Material: galvanized
steel pipe
II
Status
Loss
coefficient ζ
R/dR/W
0.5 0.90
0.75 0.45
1.0 0.33
1.5 0.24
2.0 0.19
– 1.30
0.5 1.25
0.75 0.60
1.0 0.37
1.5 0.19
0.5 1.10
0.75 0.50
1.0 0.28
1.5 0.13
0.5 1.00
0.75 0.41
1.0 0.22
1.5 0.09
0.5 0.96
0.75 0.37
1.0 0.19
1.5 0.07
1.25
1.47
–
1.50
1.38
20° 0.02
40° 0.03
60° 0.05
90° 0.11
120° 0.20
20° 0.13
40° 0.08
60° 0.12
90° 0.19
120° 0.27