Air Handling units AeroMaster XP
41
Air Flow Rate Determination for Fans with Overhung Impeller
After installing and commissioning the equipment air flow may be checked or possibly adjusted using simple method for measuring at diffuser. This
method eliminates to some extent errors in results determined by speed measurements in a wind tunnel, which are caused mainly by turbulent and
non-linear air flow. For the diagram of the measurement determination of the difference in the static pressures in front of the inlet fan diffuser and
in the fan diffuser, refer to figure # 1 (2).
Figure 1
The (fan) air flow rate can be calculated according to the following
relationship:
If the fan is operated at temperatures higher than 20°C, the air
flow rate will be calculated using the following relationship:
Impeller
type
k
factor
RH 25 C
60
RH 28 C
75
RH 31 C
95
RH 35 C
121
RH 40 C
154
RH 45 C
197
RH 50 C
262
RH 56 C
308
RH 63 C
381
RH 71 C
490
Connection of individual sections – complementary set XPSSSxxDR
If the installation does not allow disassembly of the side panels on the non-serviceable side, it is possible to order a complementary connecting
set, XPSSSxxDR (internal). When ordering this set, it is necessary to specify its type XPSSSxxDR (xx - specifies size of XP product) and number of
conections, e.g. XPSSS06DR - 2 pcs.
The connecting set is installed on the inner side of the vertical profiles of the XP connecting frame.
If ordered, the complementary assembly set will be installed in the factory in the corresponding sections on the vertical profiles of the connecting
set XPSSSxxMR.
Figure 1
Figure 3
Side panel
Connection set
XPSSSxxDR
Connecting screw M8
Fixing screw M6
Figure 2
Riveting matrix
Connecting
frame profile
V = k
√Δ
√Δ
√Δ
√Δ
√Δ
p
w
.....
.
w
op
p
k
V
Δ
⋅
⋅
=
20
20
ρ
ρ
&
.
ρ
op
qv – air flow rate
k
– fan factor (provided
by the fan
manufacturer)
Δpw – static pressure
difference (measured
value)
– air density
at operating
temperature
w
op
p
k
V
Δ
⋅
⋅
=
20
20
ρ
ρ
&
.
ρ
op
Figure 2
Impeller type
k
factor
ADH-E_0160
137
ADH-E_0180
178
ADH-E_0200
203
ADH-E_0225
246
ADH-E_0250
282
ADH-E_0280
353
ADH-E_0315
441
ADH-E_0355
504
ADH-E_0400
684
ADH-E_0450
811
ADH-E_0500
1090
ADH-E_0560
1283
ADH 630
1568
ADH 710
1776
ADH 800
2443
ADH 900
2939
ADH 1000
4182
Impeller type
k
factor
RDH-E_0180
112
RDH-E_0200
64.8
RDH-E_0225
86.2
RDH-E_0250
123
RDH-E_0280
157
RDH-E_0315
207
RDH-E_0355
277
RDH-E_0400
379
RDH-E_0450
505
RDH-E_0500
634
RDH-E_0560
875
RDH 630
1091
RDH 710
1306
RDH 800
1571
RDH 900
1904
RDH 1000
2542
RDH 1120
3367
RDH 1250
4193
RDH 1400
5260
