dynaaminen paine ja K-kerroin. – Ziehl-Abegg – Puhaltimen k-arvot

Centrifugal Fans Main Catalogue General notes
2019 Explanation of technical details

Dynamic pressure

Calculation of the dynamic pressure:

Information
p d2 = k d2 v
2

pfd2 Dynamic pressure at fan outlet in Pa
kd2 Constant factor for calculation of the dynamic pressure

ZAbluefin-
qv Air flow in m3/h

ECblue
k-factors for calculation of the dynamic pressure

Cpro-ECblue
ZAbluefin Cpro/ZAcube C ZAvblue Vpro
Size kd2 Size kd2 Size kd2 Size kd2 Size kd2
22C.1R 1.85 · 10-5
25I.CR 5.59 · 10-6 25C.CR 9.66 · 10-6 25C.1R 1.14 · 10-5 25V.VR 1.29 · 10-5
28I.CR 3.56 · 10-6 28C.CR 6.26 · 10-6 28C.1R 7.44 · 10-6 28V.VR 8.27 · 10-6 28V.1R 8,60 · 10-6
31I.CR 2.22 · 10 -6
31C.CR 4.01 · 10 -6
31C.1R 4.78 · 10 -6
31V.VR 5.12 · 10 -6
31V.1R 5.32 · 10-6
35I.CR 1.39 · 10-6 35C.CR 2.53 · 10-6 35C.1R 2.96 · 10-6 35V.VR 3.29 · 10-6 35V.1R 3.37 · 10-6

C-ECblue
40I.CR 8.62 · 10-7 40C.CR 1.61 · 10-6 40C.1R 1.82 · 10-6 40V.VR 1.87 · 10-6 40V.1R 2.13 · 10-6
45I.CR 5.39 · 10-7 45C.CR 1.00 · 10-6 45C.1R 1.13 · 10-6 45V.VR 1.22 · 10-6 45V.1R 1.36 · 10-6
50I.CR 3.54 · 10-7 50C.CR 6.22 · 10-7 50C.1R 7,14 · 10-7 50V.VR 8.12 · 10-7 50V.1R 8.82 · 10-7
56I.CR 2.25 · 10-7 56C.CR 4.06 · 10-7 56C.1R 4.65 · 10-7 56V.VR 5.27 · 10-7 56V.1R 5.37 · 10-7
63C.CR 2.58 · 10-7 63C.1R 2.98 · 10-7 63V.VR 3.45 · 10-7 63V.1R 3.36 · 10-7

ZAvblue
71C.1R 1.86 · 10-7
80C.1R 1.15 · 10-7

Vpro-ECblue
Example:

Cpro-ECblue
Type RH45C-ZID.GG.CR, article no. 114613

ZAcube-
Size Constant

Housing fans
RH25C.CR 60

RH28C.CR 75

RH31C.CR 95

RH35C.CR 121

RH40C.CR 154
components
System

RH45C.CR 197 pd2 = 197 · qv2

RH50C.CR 252

RH56C.CR 308

RH63C.CR 381
technology | Control | General notes

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General notes Centrifugal Fans Main Catalogue
Aerodynamics and acoustics 2019

Aerodynamics and acoustics
Measurement method

fs
in Pa as a funktion of the air flow rate qV1 in m3/h.

Technical conditions of supply
The specified performance data meet the respective requirements
for accuracy

AN2 for impellers without motor
AN3 for fans with standard motors
AN2 for impellers with ECblue motors (except EC055)
AN3 for impellers with EC motor EC055 (see type key)
AN4 for fans with AC external rotor motors
in line with ISO 13348 and apply to the rated data and air per-
formance curves at the rated voltage. The continuous line in the
characteristic curve represents the optimum reliable operating
range for fans.

Fan test bench
The fan characteristic curves are determined on a combined air
performance and acoustic test bench.
The fan characteristic curves are measured in compliance to DIN
EN ISO 5801, respectively AMCA 210-99. The sound power levels
are measured in compliance with DIN EN ISO 3745 and ISO
13347-3 using the enveloping surface measuring method.
The figure below shows an example of the measuring setup. The
fan intake is installed in the measuring chamber at free inlet and
free exhaust (installation type A as per DIN EN ISO 5801 respec-
tively AMCA 210-99).

Air density
The air temperature and humidity are conditioned during the
measurement using heat exchangers and kept largely constant.
The characteristic curves shown refer to the measuring density. The
mean measuring density is 1.16 kg/m³.

p p p p

fs

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General notes Centrifugal Fans Main Catalogue
Installation and usage information 2019

Installation and usage information
Measuring device for determining air volume

The active pressure process compares the static pressure before
the inlet nozzle with the static pressure in the inlet nozzle at the
place of greatest constriction (lowest free nozzle cross sectional
area). Using the energy conservation principle, the active pressure
(differential pressure of the static pressures) can be assigned to the
air flow as follows:

Under normal conditions at 20°C: Under fluctuating air conditions:

qV .
w qV= 20
· k20 · w
Betr

qv Air flow in m3/h
w
Differential pressure of the static pressures in Pa
k Coefficient for specific nozzle properties, nozzle factor
S
Standard air density with 1.2 kg/m3
Air density at current operating point in kg/m3

L-KL-2995-2 | L-KL-2995-4 | Pw | Pw | Nozzle coefficients
Size ZAbluefin Cpro C ZAvblue ZAvblue ZApilot Vpro
with EC055
Standard k With guard Standard k With guard Standard k With guard Standard k Standard k Standard k Standard k
grille kg grille kg grille kg
175 38 38
190 38 38
200 38 38
220 71 71
225 47 46 75 71 50
250 67 63 60 58 60 58 80 112 90 63
280 85 80 75 72 75 72 95 86
315 106 100 95 91 95 91 120 112
355 140 130 121 116 121 116 150 144
400 180 170 154 148 154 148 200 180
450 220 210 197 189 197 189 240 220
500 280 265 252 242 252 242 320 291
560 355 335 308 295 308 295 400 360
630 381 365 381 365 480 445
710 490 470
800 620 594
p = 1.20 kg/m³

Example: Notes pertaining to the measuring method
If an active pressure of 700 Pa is measured for size GR63I, the air The measured values, which were determined using the active
flow can be calculated as follows, using this simplified formula: pressure method, are subject to a tolerance of +/- 8.0% as they
pertain to the airflow result. This tolerance is reached above a
minimum air velocity of approx. 29.53 ft/s at the place of greatest
constriction.
qv w
3
/h The tolerances cannot be clearly quantified below this minimum air
velocity.
The corresponding active pressure / air flow characteristic curves
can be downloaded from our website in the Download section under This air flow measuring method is only suitable for acceptance
Product Information. measurements on site.
For a more accurate air flow determination in the existing installa-
The nozzle coefficients (k factors) were determined under labora- tion setup, a counter calibration of the air flow has to be carried out
tory conditions and with an undisturbed supply. If inlet guard grilles on site to measure the active pressure. The nozzle factors deter-
are used (fitted in front of the inlet nozzle), these nozzle factors mined during this process apply exclusively to this installation setup.
cannot be used for air flow determination because of a change in
the supply flow and other static pressures.

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