Daikin VAM-FA8VE, Technical Data Manual

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• HRV
•
VKM-GA(M)V1
• HRV
•
Heat Reclaim Ventilation
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
(Example)
No. Name Sketch
Status
Loss
coefficient
ζ
H/W R/dR/W
1 R bend, round duct –
0.5 0.90
0.75 0.45
1.0 0.33
1.5 0.24
2.0 0.19
2 Straight bend, round duct – – 1.30
3 R bend, rectangular duct
0.25
0.5 1.25
0.75 0.60
1.0 0.37
1.5 0.19
0.5 1.10
0.5
0.75 0.50
1.0 0.28
1.5 0.13
1.0
0.5 1.00
0.75 0.41
1.0 0.22
1.5 0.09
4.0
0.5 0.96
0.75 0.37
1.0 0.19
1.5 0.07
4 Straight bend, rectangular duct
0.25
–
1.25
0.5 1.47
1.0 1.50
4.0 1.38
5 Pipe inlet (with round hood)
θ
20° 0.02
40° 0.03
60° 0.05
90° 0.11
120° 0.20
6
Pipe inlet
(with rectangular hood)
θ
20° 0.13
40° 0.08
60° 0.12
90° 0.19
120° 0.27
le = d
ζ
λ
le : equivalent straight pipe length of partial resistance...[m]
d : straight pipe diameter................................................ [m]
ζ
: Local loss coefficient
d
R
d
R
H
W
H
W
V
θ
V
θ
(For galvanized steel pipe with
λ
= 0.02, approximate value)
External hood
(equivalent straight pipe length 9m)
VI
V
IV
III
I
II
5m
Duct diameter
φ
100
Material: galvanized
steel pipe
Ventilating fan intended for
use with a ducted system
0.5m
0.5m