SIST EN ISO 5801:2018

SLOVENSKI STANDARD
01-julij-2018
1DGRPHãþD
SIST EN ISO 5801:2009
Ventilatorji - Preskušanje lastnosti na standardiziranih merilnih progah (ISO
5801:2017)
Fans - Performance testing using standardized airways (ISO 5801:2017)
Ventilatoren - Leistungsmessung auf genormten Prüfständen (ISO 5801:2017)
Ventilateurs - Essais aérauliques sur circuits normalisés (ISO 5801:2017)
Ta slovenski standard je istoveten z: EN ISO 5801:2017
ICS:
23.120 =UDþQLNL9HWUQLNL.OLPDWVNH Ventilators. Fans. Air-
QDSUDYH conditioners
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 5801
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2017
EUROPÄISCHE NORM
ICS 23.120 Supersedes EN ISO 5801:2008
English Version
Fans - Performance testing using standardized airways
(ISO 5801:2017)
Ventilateurs - Essais aérauliques sur circuits Ventilatoren - Leistungsmessung auf genormten
normalisés (ISO 5801:2017) Prüfständen (ISO 5801:2017)
This European Standard was approved by CEN on 18 May 2017.

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-CENELEC 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-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 5801:2017 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 5801:2017) has been prepared by Technical Committee ISO/TC 117 “Fans” in
collaboration with 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 2018, and conflicting national standards shall be
withdrawn at the latest by April 2018.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 5801:2008.
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,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 5801:2017 has been approved by CEN as EN ISO 5801:2017 without any modification.

INTERNATIONAL ISO
STANDARD 5801
Third edition
2017-09
Fans — Performance testing using
standardized airways
Ventilateurs — Essais aérauliques sur circuits normalisés
Reference number
ISO 5801:2017(E)
©
ISO 2017
ISO 5801:2017(E)
© ISO 2017, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
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copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved

ISO 5801:2017(E)
Contents Page
Foreword .vii
Introduction .viii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols, abbreviated terms and subscripts .10
4.1 Symbols and abbreviated terms.10
4.2 Subscripts .12
5 General .13
6 Test configurations .14
6.1 General .14
6.2 Category A configuration .15
6.3 Category B configuration .15
6.4 Category C configuration .15
6.5 Category D configuration .15
6.6 Inlets and outlets .15
6.7 Fans with significant swirl .15
6.8 Airways .15
6.9 Test space.16
6.10 Leakage .16
6.11 Test report .16
7 Carrying out the test .16
7.1 Working fluid .16
7.2 Rotational speed .16
7.3 Steady operation .16
7.4 Ambient conditions .16
7.5 Pressure readings .17
7.6 Test for a specified duty .17
7.7 Test for a fan characteristic curve .17
7.8 Operating range .17
8 Airways for duct simulations .17
8.1 General .17
8.2 Common segments at fan inlet (iCS) .17
8.3 Inlet duct simulation (iDS) .19
8.4 Common segment at fan outlet (oCS) .20
8.5 Outlet duct simulation (oDS) .21
8.6 Long duct (LD).22
8.7 Loss allowances for standardized airways .23
8.7.1 Loss allowances for an inlet common segment (iCS) .23
8.7.2 Loss allowances for inlet duct simulation (iDS) .24
8.7.3 Loss allowances for outlet common segments (oCS) .24
8.7.4 Loss allowances for duct simulation at outlet (oDS) .25
8.7.5 Loss allowances for long duct (LD) .25
9 Standardized test chambers .25
9.1 General .25
9.2 Pressure tappings .25
9.3 Flow-settling means .25
9.3.1 General.25
9.3.2 Piezometer ring check . .26
9.3.3 Blow through verification test .26
9.3.4 Outlet chamber reverse flow verification test .26
ISO 5801:2017(E)
9.4 Standardized inlet test chambers (iTC) .26
9.4.1 Test chambers .26
9.4.2 Fan under test . .29
9.5 Standardized outlet test chambers (oTC) .30
9.5.1 Test chambers .30
9.5.2 Fan under test . .30
10 Various component parts for a laboratory setup .31
10.1 General .31
10.2 Variable supply system .31
10.2.1 General.31
10.2.2 Throttling device . .31
10.2.3 Auxiliary fan .31
10.3 Straightener .31
10.3.1 General.31
10.3.2 Cell straightener .31
10.3.3 Star straightener .32
10.4 Transition parts .33
10.4.1 General.33
10.4.2 Rectangular/circular transition .34
10.4.3 Circular/circular transition .34
10.4.4 Connection for double-inlet fans .35
11 Standard test configurations.35
11.1 Units .35
11.2 Measuring flow rate .40
11.3 Standard test configurations A .41
11.4 Standard test configurations B .42
11.5 Standard test configurations C .42
11.6 Standard test configurations D .42
12 Measurements .43
12.1 Calibration .43
12.2 Dimensions and cross-sectional areas .43
12.2.1 Tolerance on dimensions .43
12.2.2 Cross-sectional area .43
12.3 Rotational speed .44
12.4 Power input .44
12.4.1 General.44
12.4.2 Motor input power .44
12.4.3 Fan shaft power .45
12.4.4 Impeller power .46
12.4.5 Transmission systems .46
12.5 Mass flow rate .46
12.6 Temperature .47
12.6.1 General.47
12.6.2 Accuracy of temperature measurement .47
12.6.3 Correction for high velocities .47
12.7 Humidity .48
12.8 Pressure .48
12.8.1 Barometers .48
12.8.2 Manometers .49
12.8.3 Damping of manometers .49
12.8.4 Checking of manometers .49
12.8.5 Position of manometers .49
12.8.6 Average pressure in an airway .50
12.8.7 Construction of tappings .50
12.8.8 Position and connections.51
12.8.9 Methods of measurement .51
12.8.10 Checks for compliance .51
iv © ISO 2017 – All rights reserved

ISO 5801:2017(E)
12.8.11 Use of Pitot-static tube.51
12.9 Air properties .52
12.9.1 General.52
12.9.2 Density of air at section x .52
12.9.3 Air viscosity .53
12.9.4 Standard air .53
13 Reference conditions .53
14 General rules for conversion of test results .54
14.1 General .54
14.2 Laws on fan similarity .54
14.2.1 General.54
14.2.2 Geometrical similarity.54
14.2.3 Reynolds number similarity .55
14.2.4 Mach number and similarity of the velocity triangles .55
15 Calculations.55
15.1 Test results.55
15.1.1 General.55
15.1.2 Temperature .56
15.1.3 Pressure .58
15.1.4 Set of formulae .58
15.1.5 Simplified sets of formulae, which can be used for v ≤ 65m/s . 60
2.ref
15.1.6 Fan pressure .61
15.1.7 Fan static pressure .62
15.1.8 Volume flow rate of the fan .62
15.1.9 Fan air power and efficiency .62
15.2 Efficiencies .65
15.2.1 General.65
15.2.2 Fan static air power and static efficiency .66
15.3 Conversion rules .66
15.3.1 General.66
15.3.2 Shaft power and impeller power .66
16 Fan characteristic curves .67
16.1 Methods of plotting .67
16.2 Characteristic curves at constant speed.67
16.3 Characteristic curves at inherent speed .68
16.4 Complete fan characteristic curve .68
16.5 Test for a specified duty .69
16.6 Specific fan types .69
17 Uncertainty analysis .70
17.1 Principle .70
17.2 Pre-test and post-test analysis .70
17.3 Analysis procedure .70
17.4 Propagation of uncertainties .70
17.5 Reporting uncertainties .71
17.6 Maximum allowable uncertainties for measurements .71
17.7 Maximum allowable uncertainty of results .72
Annex A (normative) Determination of air flow rate .73
Annex B (informative) Fan-powered roof exhaust ventilators .90
Annex C (informative) Chamber leakage test procedure .91
Annex D (informative) Fan outlet elbow in the case of a non-horizontal discharge axis .97
Annex E (informative) Input power calculation for driven fans at design point .100
Annex F (informative) Motor fed from a variable frequency speed device .109
ISO 5801:2017(E)
Annex G (informative) Axial fans without outlet guide vanes .110
Annex H (informative) Vapour pressure, p .112
v
Annex I (informative) Clearances .113
Annex J (normative) Polytropic approach for the calculation of p from p .115
fC fTe
Annex K (informative) Examples for test setups .117
Annex L (informative) Measurement of plenum fans and plug fans .125
Annex M (informative) Comparison of NEMA methodology for calculation motor efficiency
with IEC .127
Annex N (informative) Report and results of test .128
Bibliography .136
vi © ISO 2017 – All rights reserved

ISO 5801:2017(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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 117, Fans.
This third edition cancels and replaces the second edition (ISO 5801:2007), which has been technically
revised. It also incorporates the Technical Corrigendum ISO 5801:2007/Cor.1:2008.
ISO 5801:2017(E)
Introduction
This document is the result of almost 50 years of discussion, comparative testing and detailed analyses
by leading specialists from the fan industry and research organizations throughout the world.
It was demonstrated many years ago that the codes for fan performance testing established in different
countries do not always lead to the same results.
The need for an International Standard has been evident for some time and Technical Committee
ISO/TC 117 started its work in 1963. Important progress has been achieved over the years and, although
the International Standard itself was not yet published, the successive revisions of various national
standards led to much better agreement among them.
It has become possible since 1997 to complete this document by agreement on certain essential points.
It is to be borne in mind that the test equipment, especially for large fans, is very expensive and it was
necessary to include in this document many setups from various national codes in order to authorize
their future use. This explains the sheer volume of the first edition (ISO 5801:1997).
The second edition (ISO 5801:2007) of this document was the result of a survey of ISO members,
deleting those methods that were the least frequently used. A significant reduction in the number of
pages had been achieved.
For the third edition, the contents were reorganized to define and allow all possible configurations of
defined component parts as standardized test setups. A further significant reduction of volume has
been achieved by streamlining the content.
Essential features of this document are as follows.
— Installation categories and test configurations (see Clause 5 and Clause 6).
Since the connections of a duct to a fan inlet and/or outlet affect the fan's performance, a number of
installation categories and test configurations need to be recognized.
— Common segments (see Clause 8).
It is essential that all standardized test airways to be used with fans need to have portions in
common adjacent to the fan inlet and/or outlet sufficient to ensure consistent determination of fan
pressure.
Geometric variations of these common segments are strictly limited.
— Flow rate measurement (see 12.5 and Annex A).
Determination of flow rate has been separated from the determination of fan pressure. A number
of standardized methods may be used.
— Test results (see Clause 15).
Methods of measurement and calculation for the flow rate, for the fan pressure and for the fan
efficiencies are established taking into account all compressibility effects of the air. For fan pressure
less than 2 000 Pa, the change of density between fan inlet and fan outlet is allowed to be neglected.
Other compressibility effects are allowed to be neglected for reference velocity values not higher
than 65 m/s (see Clause 13).
viii © ISO 2017 – All rights reserved

INTERNATIONAL STANDARD ISO 5801:2017(E)
Fans — Performance testing using standardized airways
1 Scope
This document specifies procedures for the determination of the performance of fans of all types except
those designed solely for air circulation, e.g. ceiling fans and table fans. Testing of jet fans is described
in ISO 13350.
This document provides estimates of uncertainty of measurement and rules for the conversion, within
specified limits, of test results for changes in speed, gas handled and, in the case of model tests, size
are given.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 5136, Acoustics — Determination of sound power radiated into a duct by fans and other air-moving
devices — In-duct method
ISO 5167–1, Measurement of fluid flow by means of pressure differential devices inserted in circular cross-
section conduits running full — Part 1: General principles and requirements
ISO 5802, Industrial fans — Performance testing in situ
ISO 13347 (all parts), Industrial fans — Determination of fan sound power levels under standardized
laboratory conditions
ISO 13348, Industrial fans — Tolerances, methods of conversion and technical data presentation
ISO 13349, Fans — Vocabulary and definitions of categories
ISO 13350, Fans — Performance testing of jet fans
IEC 60034-1:2010, Rotating electrical machines — Part 1: Rating and performance
IEC 60034-2-1:2014, Rotating electrical machines — Part 2-1: Standard methods for determining losses
and efficiency from tests (excluding machines for traction vehicles)
IEC 60051-2, Direct acting indicating analogue electrical measuring instruments and their accessories —
Part 2: Special requirements for ammeters and voltmeters
IEC 60051-3, Direct acting indicating analogue electrical measuring i
...