dynaaminen paine ja K-kerroin..pdf

Dokumentin teksti

Centrifugal Fans Main Catalogue
2019

General notes
Explanation of technical details

Dynamic pressure

p d2 = k d2

ZAbluefinECblue

Air flow in m3/h

k-factors for calculation of the dynamic pressure

ZAbluefin
Size

kd2

25I.CR
31I.CR

28I.CR

35I.CR

40I.CR

45I.CR

50I.CR

C

Size

kd2

5.59 · 10-6

25C.CR

9.66 · 10-6

2.22 · 10

31C.CR

4.01 · 10

3.56 · 10-6
-6

1.39 · 10-6

8.62 · 10-7

5.39 · 10-7

3.54 · 10-7

2.25 · 10-7

28C.CR

35C.CR

40C.CR

45C.CR

50C.CR

56C.CR

63C.CR

Size

6.26 · 10-6
-6

2.53 · 10-6

1.61 · 10-6

1.00 · 10-6

6.22 · 10-7

4.06 · 10-7

2.58 · 10-7

ZAvblue

kd2

kd2

1.14 · 10-5

25V.VR

1.29 · 10-5

4.78 · 10

31V.VR

5.12 · 10

22C.1R

1.85 · 10-5

28C.1R

7.44 · 10-6

25C.1R

31C.1R

35C.1R

40C.1R

45C.1R

50C.1R

56C.1R

-6

2.96 · 10-6

1.82 · 10-6

1.13 · 10-6

7,14 · 10-7

4.65 · 10-7

63C.1R

2.98 · 10-7

80C.1R

1.15 · 10-7

71C.1R

Vpro

Size

1.86 · 10-7

28V.VR

35V.VR

40V.VR

45V.VR

50V.VR

56V.VR

63V.VR

8.27 · 10-6
-6

3.29 · 10-6

1.87 · 10-6

1.22 · 10-6

8.12 · 10-7

5.27 · 10-7

3.45 · 10-7

Size

kd2

28V.1R

8,60 · 10-6

31V.1R

35V.1R

40V.1R

45V.1R

50V.1R

56V.1R

63V.1R

5.32 · 10-6

3.37 · 10-6

2.13 · 10-6

1.36 · 10-6

8.82 · 10-7

5.37 · 10-7

3.36 · 10-7

Vpro-ECblue

56I.CR

Cpro/ZAcube

Cpro-ECblue

qv

Dynamic pressure at fan outlet in Pa

Constant factor for calculation of the dynamic pressure

C-ECblue

kd2

2

ZAvblue

pfd2

v

Information

Calculation of the dynamic pressure:

ZAcubeCpro-ECblue

Example:

RH28C.CR

75

RH31C.CR

95

RH35C.CR

121

RH40C.CR

154

RH45C.CR

197

RH50C.CR

252

RH56C.CR

308

RH63C.CR

381

pd2 = 197 · qv2

System
components

60

Control
technology

Constant

RH25C.CR

General notes

Size

Housing fans

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

ziehl-abegg.com

353

General notes
Aerodynamics and acoustics

Centrifugal Fans Main Catalogue
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 performance 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 respectively 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

354

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General notes
Installation and usage information

Centrifugal Fans Main Catalogue
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

qV=

20
Betr

· k20 ·

w

Air flow in m3/h

Coefficient for specific nozzle properties, nozzle factor
Standard air density with 1.2 kg/m3

Nozzle coefficients
Size

ZAbluefin

Standard k
175

With guard
grille kg

Cpro
Standard k

C
With guard
grille kg

ZAvblue

Standard k

With guard
grille kg

Standard k

190
220
250

67

63

315

106

100

95

91

180

170

154

148

280
355
400
450
500
560
630

85

80

140

130

220

210

280

265

355

335

710

60

75

121
197
252
308

381

58

47

46

75

72

60

72

95

Standard k

Standard k

Standard k

38

38

38

38

308

365

381

490

Example:
If an active pressure of 700 Pa is measured for size GR63I, the air
flow can be calculated as follows, using this simplified formula:

3

/h

The corresponding active pressure / air flow characteristic curves
can be downloaded from our website in the Download section under
Product Information.
The nozzle coefficients (k factors) were determined under laboratory conditions and with an undisturbed supply. If inlet guard grilles
are used (fitted in front of the inlet nozzle), these nozzle factors
cannot be used for air flow determination because of a change in
the supply flow and other static pressures.

71

90

50

63
86

200

180

189

295

95

112

71

148

197
252

80

75

112

189
242

71

38

120

116

154

p = 1.20 kg/m³

364

Vpro

91

121

620

w

58

116

800

qv

ZApilot

38

200
225

ZAvblue
with EC055

242
295

365

470

150
240
320
400

480

144
220
291
360

445

594

Notes pertaining to the measuring method
The measured values, which were determined using the active
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.
The tolerances cannot be clearly quantified below this minimum air
velocity.
This air flow measuring method is only suitable for acceptance
measurements on site.
For a more accurate air flow determination in the existing installation setup, a counter calibration of the air flow has to be carried out
on site to measure the active pressure. The nozzle factors determined during this process apply exclusively to this installation setup.

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L-KL-2995-2

Air density at current operating point in kg/m3

Pw

S

Differential pressure of the static pressures in Pa

Pw

w

k

w

L-KL-2995-4

qv

.