EN ISO 5801:2017/prA1

SLOVENSKI STANDARD
01-junij-2024
Ventilatorji - Preskušanje lastnosti na standardiziranih merilnih progah - Dopolnilo
A1 (ISO 5801:2017/DAM 1:2024)
Fans - Performance testing using standardized airways - Amendment 1 (ISO
5801:2017/DAM 1:2024)
Ventilatoren - Leistungsmessung auf genormten Prüfständen - Änderung 1 (ISO
5801:2017/DAM 1:2024)
Ventilateurs - Essais aérauliques sur circuits normalisés - Amendement 1 (ISO
5801:2017/DAM 1:2024)
Ta slovenski standard je istoveten z: EN ISO 5801:2017/prA1
ICS:
23.120 Zračniki. Vetrniki. Klimatske Ventilators. Fans. Air-
naprave conditioners
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
Amendment
ISO 5801:2017/
DAM 1
ISO/TC 117
Fans — Performance testing using
Secretariat: BSI
standardized airways
Voting begins on:
AMENDMENT 1
2024-04-01
Ventilateurs — Essais aérauliques sur circuits normalisés Voting terminates on:
2024-06-24
AMENDEMENT 1
ICS: 23.120
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Reference number
ISO 5801:2017/DAM 1:2024(en)
DRAFT
ISO 5801:2017/DAM 1:2024(en)
Amendment
ISO 5801:2017/
DAM 1
ISO/TC 117
Fans — Performance testing using
Secretariat: BSI
standardized airways
Voting begins on:
AMENDMENT 1
Ventilateurs — Essais aérauliques sur circuits normalisés Voting terminates on:
AMENDEMENT 1
ICS: 23.120
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2024
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
POTENTIAL TO BECOME STANDARDS TO
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NATIONAL REGULATIONS.
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TO SUBMIT, WITH THEIR COMMENTS,
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NOTIFICATION OF ANY RELEVANT PATENT
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PROVIDE SUPPORTING DOCUMENTATION.
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland Reference number
ISO 5801:2017/DAM 1:2024(en)
ii
ISO 5801:2017/DAM 1:2024(en)
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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
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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 www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 117, Fans.
A list of all parts in the ISO 5801 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

iii
ISO 5801:2017/DAM 1:2024(en)
Fans — Performance testing using standardized airways
AMENDMENT 1
3.8 hydraulic diameter
Add the variable E behind perimeter.
Replace the equation with
4A
D =
h
E
3.9 hydraulic mean depth
Replace the equation with
A
H =
h
E
4.1 Symbols and abbreviated terms
Add the Symbol E
E Perimeter 3.8 and 3.9 m
Change the definition reference for Polytropic exponent to 15.1.9.2
n Polytropic exponent 15.1.9.2 —
n
Delete the Perimeter P with missing indicee (Line after Fan air power)

9.3.3 Blow through verification test
Add quotation marks for Blow through:              9.3.3 “Blow through” verification test
Replace the text with the following.
This test evaluates the ability of the airflow settling means to provide a substantially uniform airflow ahead
of a measurement plane. For this test, equally spaced measurement points are located in a plane 0,1D
h
downstream of the settling means. The number of measurement points shall be in accordance with ISO 5802.

ISO 5801:2017/DAM 1:2024(en)
— Nozzle wall
For tests of settling means upstream of the nozzle wall, the auxiliary fan should be set at its maximum
flow rate, the entire nozzle array that induces the most distorted flow shall be open and the inlet shall be
unrestricted so that the inlet area shall be equal to the largest area allowed by the cross-sectional area.
— Test fan
For tests of settling means upstream of the test fan, the auxiliary fan shall be set at its maximum flow
rate, half of the nozzle array that induces the most distorted flow shall be open and the outlet shall be
open so that the outlet area shall be equal to the largest area allowed by the cross-sectional area.
The flow velocities shall be measured and the average determined. If the maximum velocity is less than 2 m/s
or if the maximum velocity value does not exceed 125 % of the average, the settling screens are acceptable.

Clause 11.1 Units, first paragraph
Replace “Some examples are shown in Annex K” with “Some examples are shown in Annex L”

15.1.9.1 General
Replace the text and the equation with the following and add the NOTE.
The fan air power can be written as Formula (47):
Pq=⋅y (47)
ufm
There are two methods to calculate the air power:
— the first (15.1.9.2) derived from polytropic change of state to take into account the influence of air
compressibility;
— the other one (15.1.9.3) for the simplified sets of formulae (v ≤ 65 m/s)
2.ref
.
If fan impeller power, P , is not measured and cannot be determined from known component efficiencies
r
such as a calibrated motor, the method in 15.1.9.3 shall be used.
NOTE In instances where there exists a strongly non-adiabatic machine, such as high-pressure fans and blowers
(where the fan pressure p exceeds 10 000 Pa), or systems with a notable temperature disparity between the machine
f
and the surrounding environment ( ΔΘ >50 K) , the exergetic computation of the fan air power is outlined in Annex J
15.1.9.2
Replace the title with
15.1.9.2 Calculation of fan air power from the polytropic change of state

ISO 5801:2017/DAM 1:2024(en)
Change the text and equations with the following.
Pq=⋅y (48)
ufm
with
n −1
n
 
2 2
n pp  q  q 
 n  1   1
n 1 2 n m m
y = −1 + f − f
     
f M2 M1
 
n −1 ρρp 2 A 2 ρ A
     
n 1 1 22 11
 
 
with the polytropic exponent
p
 
ln
 
p
 
n =
n
 p  Θ 
2 2
ln −ln
   
p Θ
   
1 1
If the static outlet temperature Θ is not measured, it can be determined with
P
r
ΘΘ=+
qc⋅
mp
15.1.9.3
Change the title to 15.1.9.3 Calculation of fan air power for simplified calculation (v ≤ 65 m/s)
2.ref
Replace the text with the following.
Pq=⋅y (49)
um f
with
2 2
pp− q q
1   1  
21 mm
y = + −
f    
ρρ2 A 2 ρ A
   
m 22 11
where
pp+
ρ =
m
For p ≤ 2 000 Pa, ρ can be set equal to ρ and so ρ = ρ .
f 2 1 m 1
Delete Figure 32.
15.1.9.4
Delete the whole subsection 15.1.9.4.

15.2.1 General
ISO 5801:2017/DAM 1:2024(en)
Reduce the number of the equations by 1 (in the text and in the equations)

15.2.2 Fan static air power and static efficiency
Replace the text and the equation with the following.
The fan static air power can be written as Formula (55):
Pq=⋅y (55)
us mfs
with
n −1
n
 
n pp q
  n 1  
 
n 1 2 n m
y = −1 −
fs    
 
n −1 ρρp 2 A
n 1  1   11 
 
 
or
pp− 1  q 
21 m
y = −
f  
ρρ2 A
 
m 11
for v ≤ 65 m/s where
2.ref
pp+
ρ =
m
For p ≤ 2 000 Pa, ρ can be set equal to ρ and so ρ = ρ .
f 2 1 m 1
The various efficiencies are calculated from P in the same way as in 15.2.
us
15.3.1 General
Reduce the number of the equations by 1 (in the text and in the equations).
Replace Annex J with Annex K in the second clause.

15.3.2 Shaft power and impeller power
Reduce the number of the equations by 1 (in the text and in the equations).

16.2 Characteristic curves at constant speed.
Adjust the numbering of the figure from 34 to 32 (in the text and in the figure title).

16.5 Test for a specified duty
Adjust the numbering of the figure from 35 to 33 in the figure title.

16.6 Specific fan types
Replace Annex L with Annex M in the last sentence.

ISO 5801:2017/DAM 1:2024(en)
17.3 Analysis procedure
Replace the third bullet point with the following.
— for each measurement, combine separately the element bias limits (ISO 5168 Type B) and the element
precision indices (ISO 5168 Type A) by the root-sum-square (RSS) method; all bias limits and precision
indices shall be returned to standard uncertainty by dividing by their coverage factors.

17.4
Replace the title with
17.4 Propagation of uncertainty
Replace Annex N with Annex 0 in the NOTE.

17.5
Replace the title with
17.5 Reporting uncertainty
Replace the text with the following.
The test report shall state the following for each parameter of interest:
a) the test value of the parameter, e.g. air volume flow rate q ;
v
NOTE The best estimate of a parameter is the test value. This estimate can be improved by repeating the test
and using the average result.
b) the expanded uncertainty (expressed in absolute or relative terms as appropriate)
c) the confidence level, which is predefined at approximately 95 %;
EXAMPLE q_/vm=±50 sm,/05 s with 95 % confidence level

17.6 Maximum allowable uncertainties for measurements
Replace the column for relative uncertainty of measurement with “Relative expanded uncertainty of
measurement”.
Relative expanded uncertainty of measurement
*
U = 0,2 %
p
a
*
U = 0,2 %
θ
a
*
U = 1,4 %
p
e
*
U = 1,4 %
Δp
*
U = 0,5 %
n
*
U = 2 %
P
r
ISO 5801:2017/DAM 1:2024(en)
Relative expanded uncertainty of measurement
*
U = 0,2 %
A
d
*
U = 0,5 %
A
x
*
U
q
m
17.7 Maximum allowable uncertainty of results
Replace “Clause” with “table” in the first sentences of the first and second clause.
Add “expanded” in the second sentence:
Also listed is the maximum allowable relative expanded uncertainty for each result, if the test is to qualify
as a test conducted under this document.

Replace the column for Maximum relative uncertainty of result with “Maximum relative expanded
uncertainty of measurement”.
Maximum relative expanded uncertainty of result
*
U = 0,4 %
ρ
a
*
U = 2,8 %
Δθ
*
U = 0,4 %
θ
sg2
*
U = 0,7 %
ρ
sg2
*
U = 4,0 %
p
fd
*
U = 1,4 %
p
f
*
U = 2,5 %
P
u
*
U = 3,2 %
η
r
* *
U or U = 2,0 %
q q
m v
A.4.1 Installation
Replace the text with the following.
For tests in standardized airways, multiple nozzles can be used within inlet or outlet chambers. The nozzles
may be of varying sizes but shall be symmetrically positioned relative to the axis of the chamber, as to both
size and r
...