SIST EN ISO 5802:2009

SLOVENSKI STANDARD
SIST EN ISO 5802:2009
01-april-2009
Industrijski ventilatorji - Preskušanje lastnosti na mestu (ISO 5802:2001)
Industrial fans - Performance testing in situ (ISO 5802:2001)
Ventilateurs industriels - Essai de performance in situ (ISO 5802:2001)
Ta slovenski standard je istoveten z: EN ISO 5802:2008
ICS:
23.120 =UDþQLNL9HWUQLNL.OLPDWVNH Ventilators. Fans. Air-
QDSUDYH conditioners
SIST EN ISO 5802:2009 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 5802:2009

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SIST EN ISO 5802:2009
EUROPEAN STANDARD
EN ISO 5802
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2008
ICS 23.120

English Version
Industrial fans - Performance testing in situ (ISO 5802:2001)
Ventilateurs industriels - Essai de performance in situ (ISO
5802:2001)
This European Standard was approved by CEN on 2 October 2008.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 5802:2008: E
worldwide for CEN national Members.

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SIST EN ISO 5802:2009
EN ISO 5802:2008 (E)
Contents Page
Foreword.3

2

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SIST EN ISO 5802:2009
EN ISO 5802:2008 (E)
Foreword
The text of ISO 5802:2001 has been prepared by Technical Committee ISO/TC 117 “Industrial fans” of the
International Organization for Standardization (ISO) and has been taken over as EN ISO 5802:2008 by
Technical Committee CEN/TC 156 “Ventilation for buildings” the secretariat of which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by April 2009, and conflicting national standards shall be withdrawn at the
latest by April 2009.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 5802:2001 has been approved by CEN as a EN ISO 5802:2008 without any modification.

3

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SIST EN ISO 5802:2009

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SIST EN ISO 5802:2009
INTERNATIONAL ISO
STANDARD 5802
First edition
2001-07-15
Industrial fans — Performance testing
in situ
Ventilateurs industriels — Essai de fonctionnement in situ
Reference number
ISO 5802:2001(E)
©
ISO 2001

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SIST EN ISO 5802:2009
ISO 5802:2001(E)
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© ISO 2001
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
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ii © ISO 2001 – All rights reserved

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SIST EN ISO 5802:2009
ISO 5802:2001(E)
Contents Page
Foreword.v
Introduction.vi
1 Scope .1
2 Normative references .1
3 Terms, definitions and symbols.1
3.1 Terms and definitions .1
3.2 Symbols .14
4 Quantities to be measured.18
5 General conditions and procedures concerning in situ tests .18
5.1 General recommendations .18
5.2 Selection of test point when only the system resistance can be varied.18
5.3 Fans fitted with adjustment devices.19
5.4 System throttling devices allowing the system resistance to be altered .19
5.5 Selection of the test point when the system resistance cannot be varied.19
5.6 When correction of the coefficient deduced from the test is not necessary .20
6 Instrumentation.20
6.1 Instrumentation for measurement of pressure.20
6.2 Measurement of air velocity .21
6.3 Measurement of temperature .23
6.4 Determination of density.24
6.5 Measurement of rotational speed .25
7 Determination of fan pressure.25
7.1 Location of pressure measurement plane .25
7.2 Measurement of fan pressure.27
8 Determination of flow rate .36
8.1 Choice of measuring method .36
8.2 Choice of measuring section.36
8.3 Determination of flowrate using differential pressure devices.38
8.4 Determination of flowrate by velocity area methods .38
9 Determination of power.54
9.1 Definition of performance characteristics relating to the power of a fan.54
9.2 Losses during transmission of power from the motor to the impeller .56
9.3 Methods for determination of power .56
9.4 Measuring instruments .59
9.5 Precautions to be taken during in situ tests.59
10 Uncertainty associated with the determination of fan performance.59
10.1 General.59
10.2 Performance errors .60
10.3 Uncertainty of measurement .60
10.4 Specified uncertainties .60
10.5 Analysis of uncertainty .60
Annex A (normative) Position of exploration lines for a marginal wall profile compatible with a general
power law.67
Annex B (normative) Determination of the position of the marginal exploration lines in cases not
covered by annex A.71
© ISO 2001 – All rights reserved iii

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SIST EN ISO 5802:2009
ISO 5802:2001(E)
Annex C (normative) Minimum straight lengths required upstream and downstream of the differential
pressure devices (DP device) used for flow measurement.74
Annex D (normative) Loss allowance for straight, smooth ducts and standardized airways .82
Annex E (normative) Rotating vane anemometer calibration.84
Bibliography .86
iv © ISO 2001 – All rights reserved

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SIST EN ISO 5802:2009
ISO 5802:2001(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO
member bodies). The work of preparing International Standards is normally carried out through ISO technical
committees. Each member body interested in a subject for which a technical committee has been established has
the right to be represented on that committee. International organizations, governmental and non-governmental, in
liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 5802 was prepared by Technical Committee ISO/TC 117, Industrial fans.
Annexes A to E form a normative part of this International Standard.
© ISO 2001 – All rights reserved v

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SIST EN ISO 5802:2009
ISO 5802:2001(E)
Introduction
The need to revise existing methods of site testing has been apparent for some time. Bearing in mind the extent of
these revisions, it was felt appropriate to expand the method of site testing into a "stand-alone" document. This
would enable the velocity area methods to be fully detailed for all commonly encountered airway cross-sections. It
would also allow the addition of descriptive annexes covering the selection of suitable measuring stations and
instrument calibration.
In accordance with recent International agreements, it will be noted that fan pressure is now defined as the
difference between stagnation pressure at the fan inlet and outlet. Stagnation pressure is the absolute pressure
which would be measured at a point in a flowing gas if it were brought to rest isentropically. For Mach numbers less
than 0,2 the gauge stagnation pressure is within 0,6 % of the total pressure.
Less emphasis is placed on the use of "fan static pressure" as this is a conventional quantity only. It is to be
anticipated that its use will cease with time. All fluid losses are essentially losses in stagnation pressure and this
has been reflected in the definitions now specified.
It should be recognized that the performance of a fan measured under site conditions will not necessarily be the
same as that determined from tests using standardized airways. The reasons for such differences are not only due
to the inherently lower accuracy of a site test, but also due to the so-called "system effect factor" or "installation
effect", where the ducting connections at fan inlet and/or outlet modify its performance. The need for good
connections cannot be understated. This International Standard specifies the use of "common parts" immediately
adjoining the fans for the consistent determination of pressure and also to ensure that air/gas is presented to the
fan as a symmetrical velocity profile free from swirl and undue distortion. Only if these conditions are met, will the
performance under site conditions equate with those measured in standardized airways.
It should also be noted that this International Standard specifies the positioning of velocity-area measuring points
according to log-Tchebycheff or log-linear rules. Arithmetic spacing can lead to considerable error unless a very
high number of point readings are taken. (These would then have to be plotted graphically and the area under the
curve obtained using planimetry. The true average velocity would be this area divided by the dimensional
ordinates).
It is outside the scope of this International Standard to assess the additional uncertainty where the lengths of
straight duct either side of the measuring station are less than those specified in annex C. Guidance is, however,
given in ISO/TR 5168 and ISO 7194, from which it will be seen that where a significant radial component exists,
uncertainties can considerably exceed the normally anticipated 4 % at 95 % confidence levels.
vi © ISO 2001 – All rights reserved

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SIST EN ISO 5802:2009
INTERNATIONAL STANDARD ISO 5802:2001(E)
Industrial fans — Performance testing in situ
1 Scope
This International Standard specifies tests for determining one or more performance characteristics of fans installed
in an operational circuit when handling a monophase fluid.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this International Standard. For dated references, subsequent amendments to, or revisions of, any of these
publications do not apply. However, parties to agreements based on this International Standard are encouraged to
investigate the possibility of applying the most recent editions of the normative documents indicated below. For
undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC
maintain registers of currently valid International Standards.
ISO 5167-1:1991, Measurement of fluid flow by means of pressure differential devices — Part 1: Orifice plates,
nozzles and Venturi tubes inserted in circular cross-section conduits running full.
ISO 5801:1997, Industrial fans — Performance testing using standardized airways.
IEC 60034-1, Rotating electrical machine — Part 1: Rating and performance.
IEC 60051-8, Direct acting indicating analogue electrical measuring instruments and their accessories — Part 8:
Special requirements for accessories.
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this International Standard, the following terms and definitions apply.
The quantities referred to are time-averaged mean values. Fluctuations which affect the quantities being measured
may be accounted for by repeating measurements at appropriate time intervals. Mean values may then be
calculated which are taken as the steady-state value.
3.1.1
air
air or other gas, except when specifically referred to as atmospheric air
3.1.2
standard air
–3
atmospheric air having a density of exactly 1,2 kg�m
NOTE Atmospheric air at a temperature of 16 °C, a pressure of 100 000 Pa and a relative humidity of 65 %, has a density
–3
of 1,2 kg�m , but these conditions are not part of the definition.
© ISO 2001 – All rights reserved 1

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SIST EN ISO 5802:2009
ISO 5802:2001(E)
3.1.3
fan
rotary machine which maintains a continuous flow of air at a pressure ratio not normally exceeding 1,3
3.1.4
impeller
rotating part of a fan which, by means of its blades, transfers energy to the air
3.1.5
casing
those stationary parts of a fan which direct the flow of air from the fan inlet opening(s) to the fan outlet opening(s)
3.1.6
duct
airway in which the air velocity is comparable with that at the fan inlet or outlet
3.1.7
chamber
airway in which the air velocity is small compared with that at the fan inlet or outlet
3.1.8
transition piece
section
airway along which there is a gradual change of cross-sectional area and/or shape
3.1.9
test enclosure
room, or other space protected from draught, in which the fan and test airways are situated
3.1.10
area of the conduit section
A
x
area of the conduit at section x
3.1.11
fan inlet area
A
1
by convention, the gross area in the inlet plane inside the casing
NOTE The fan inlet plane should be taken as that surface bounded by the upstream extremity of the air moving device. In
this International Standard the fan inlet plane is indicated by plane 1 (see Figure 1).
3.1.12
fan outlet area
A
2
by convention, the gross area in the outlet plane inside the casing without deduction for motors, fairings or other
obstructions
NOTE The fan outlet plane should be taken as that surface bounded by the downstream extremity of the air moving
device. In this International Standard the outlet is indicated by plane 2 (see Figure 1).
3.1.13
temperature
t
air or fluid temperature measured by a temperature sensor
2 © ISO 2001 – All rights reserved

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SIST EN ISO 5802:2009
ISO 5802:2001(E)
a) Axial fan
b) Centrifugal fan
Key
1 Plane 1 5 Transition
2 Plane 2 6 Diffuser
3 Inlet box 7 Transition
4 Inlet duct 8 Outlet duct
Figure 1 — Location of pressure measurement planes for site testing
© ISO 2001 – All rights reserved 3

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SIST EN ISO 5802:2009
ISO 5802:2001(E)
3.1.14
absolute temperature
�
thermodynamic temperature measured above absolute zero
� = t+273,15
3.1.15
stagnation temperature at a point
�
sg
absolute temperature which results if an ideal gas flow is brought to rest isentropically without addition of energy or
heat
NOTE The stagnation temperature is constant along an airway, and for an inlet duct is equal to the absolute ambient
temperature in the test enclosure.
3.1.16
static or fluid temperature
�
absolute temperature of a thermal sensor moving at the fluid velocity
2
v
��� �
sg
2c
p
where � is the fluid velocity (m/s)
3.1.17
dry bulb temperature
t
d
air temperature measured by a dry temperature sensor in the test enclosure, near the fan inlet or airway inlet
3.1.18
wet bulb temperature
t
w
air temperature measured by a temperature sensor covered by a water-moistened wick and exposed to air in
motion
NOTE When properly measured, it is a close approximation of the temperature of adiabatic saturation.
3.1.19
stagnation temperature at a section
�
sgx
mean value in time of the stagnation temperature averaged over the area of the specified airway cross section
3.1.20
static or fluid temperature at a section
�
x
mean value in time of the static or fluid temperature averaged over the area of the specified airway cross section
3.1.21
specific gas constant
R
for an ideal gas, the equation of state is written
p
� R�
�
4 © ISO 2001 – All rights reserved

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SIST EN ISO 5802:2009
ISO 5802:2001(E)
3.1.22
inlet stagnation temperature
�
sg1
temperature in the test enclosure near the fan inlet or the inlet duct at a section where the fluid velocity is less than
25 m/s
NOTE In this case the stagnation temperature may be considered equal to the ambient temperature
���� t� 273,15
sg1 a a
3.1.23
isentropic exponent
�
for an ideal gas and an isentropic process
p
� constant
�
�
3.1.24
specific heat at constant pressure
c
p
for an ideal gas:
�
cR�
p
� � 1
3.1.25
specific heat at constant volume
c
V
for an ideal gas
R
c �
V
� � 1
3.1.26
compressibility factor
Z
p
Z �
�R�
p �
and Z is a function of the ratios and
p �
cc
where
p is the critical pressure of the gas
c
� is the critical temperature of the gas
c
NOTE For an ideal gas Z =1.
3.1.27
absolute pressure at a point
p
pressure measured from absolute zero, which is exerted at a point at rest relative to the air around it
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SIST EN ISO 5802:2009
ISO 5802:2001(E)
3.1.28
atmospheric pressure
p
a
absolute pressure of the free atmosphere at the mean altitude of the fan
3.1.29
gauge pressure
p
e
value of a pressure when the datum pressure is the atmospheric pressure at the point of measurement
NOTE It may be negative or positive:
p = p – p
e a
3.1.30
absolute stagnation pressure at a point
p
sg
absolute pressure which would be measured at a point in a flowing gas if it were brought to rest via an isentropic
process
�
��� � 1 ��1
2
pp��1 Ma
sg��
��2
where Ma is the Mach number at this point
3.1.31
dynamic pressure at a point
p
d
pressure calculated from the velocity� and the density� of the air at the point
2
�v
p �
d
2
3.1.32
total pressure at a point
p
t
absolute stagnation pressure minus the atmospheric pressure
p = p – p = p + p
t sg a e d
NOTE When the Mach number is less than 0,2, the Mach factor is less than 1,01 and the absolute stagnation pressure p
sg
is very close to the sum of the gauge pressure, the atmospheric pressure and the dynamic pressure:
p � p + p + p
sg e a d
3.1.33
average gauge pressure at a section x
p
ex
mean value in time of the gauge pressure averaged over the area of the specified airway cross section
3.1.34
average absolute pressure at a section x
p
x
mean value in time of the absolute pressure averaged over the area of the specified airway cross section
p = p + p
x ex a
6 © ISO 2001 – All rights reserved

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SIST EN ISO 5802:2009
ISO 5802:2001(E)
3.1.35
conventional dynamic pressure at a section x
p
dx
dynamic pressure calculated from the average velocity and the average density at the specified airway cross
section
2
2
��
vq1
mx m
p���
dx x
��
22� ��A
xx
3.1.36
fan dynamic pressure
p
dF
conventional dynamic pressure at the fan outlet calculated from the mass flow, the average air density at the outlet
and the fan outlet area
2
2
vq1��
m2 m
p���
dF 2
��
22���A
22
3.1.37
absolute stagnation pressure at a section x
p
sgx
sum of the conventional dynamic pressure p corrected by the Mach factor coefficient F at the section and the
dx Mx
average absolute pressure p
x
p = p + p F
sgx x dx Mx
NOTE The absolute stagnation pressure may be calculated by the expression:
�
��� � 1 ��1
2
pp��1 Ma
sgx x��x
��2
3.1.38
average total pressure at a section x
p
tx
when the Mach number is less than 0,122, the Mach factor F may be neglected so
M
p = p + p = p – p
tx ex dx sgx a
3.1.39
fan pressure
p
F
difference between the stagnation pressure at the fan outlet and the stagnation pressure at the fan inlet
p = p – p
F sg2 sg1
3.1.40
fan static pressure
p
sF
conventional quantity defined as the fan pressure minus the fan dynamic pressure corrected by the Mach factor at
the fan outlet area
p = p – p F – p = p – p
sF sg2 dF M2 sg1 2 sg1
© ISO 2001 – All rights reserved 7

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SIST EN ISO 5802:2009
ISO 5802:2001(E)
3.1.41
Mach number at a point
Ma
ratio of the fluid velocity at a point and the velocity of sound in the fluid
NOTE For an ideal gas:
v
Ma �
��R
w
3.1.42
Mach number at a section x
Ma
x
ratio of the fluid average velocity by the velocity of sound at the specified airway cross section
v
mx
Ma �
x
��R
wx
3.1.43
Mach factor
F
M
correction factor which is applied to the dynamic pressure at a point given by the expression
pp�
sg
F �
M
p
d
NOTE The Mach factor may be calculated by:
24 6
Ma Ma Ma
F ��1.� � �. for � =1,4
M
4 40 1600
3.1.44
stagnation inlet density
�
sg1
density calculated from the stagnation inlet pressure p and the stagnation inlet temperature �
sg1 sg1
p
sg1
� �
sg1
R �
wsg1
3.1.45
average density at a section x
�
x
fluid density calculated from the absolute pressure p and the static temperature �
x x
p
x
� �
x
R �
wx
3.1.46
mean density
�
m
arithmetic mean value of inlet and outlet densities
� � �
12
� �
m
2
8 © ISO 2001 – All rights reserved

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SIST EN ISO 5802:2009
ISO 5802:2001(E)
3.1.47
mean mass flowrate at a section
q
m
mean value over time of the mass of fluid which passes through the specified airway cross section per unit of time
NOTE The mass flow will be the same at all cross sections within the fan airway system, apart from leakage. When the fan
is not gastight, the mass flow is taken as either that at the fan inlet or outlet, as appropriate.
3.1.48
inlet stagnation volume flow
q
Vsg1
mass flowrate divided by the stagnation inlet density
q
m
q �
Vsg1
�
sg1
3.1.49
outlet stagnation volume flow
q
Vsg2
mass flowrate divided by the stagnation outlet density
q
m
q �
Vsg2
�
sg2
3.1.50
volume flow at a section x
q
Vx
mass flow at the specified airway cross section divided by the corresponding mean value in time of the average
density at that section
q
m
q �
V x
�
x
3.1.51
average velocity at a section x
�
mx
volume flow at the specified airway cross section divided by the cross-sectional area A
q
V
...