oSIST prEN ISO 13350:2019

SLOVENSKI STANDARD
01-februar-2019
Ventilatorji - Preskus lastnosti indukcijskih ventilatorjev (ISO/DIS 13350:2018)
Fans - Performance testing of jet fans (ISO/DIS 13350:2018)
Ventilateurs - Essai de performance des ventilateurs accélérateurs (ISO/DIS
13350:2018)
Ta slovenski standard je istoveten z: prEN ISO 13350
ICS:
23.120 =UDþQLNL9HWUQLNL.OLPDWVNH Ventilators. Fans. Air-
QDSUDYH conditioners
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT INTERNATIONAL STANDARD
ISO/DIS 13350
ISO/TC 117 Secretariat: BSI
Voting begins on: Voting terminates on:
2018-12-26 2019-03-20
Fans — Performance testing of jet fans
Ventilateurs — Essai de performance des ventilateurs accélérateurs
ICS: 23.120
THIS DOCUMENT IS A DRAFT CIRCULATED
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STANDARD UNTIL PUBLISHED AS SUCH.
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ISO/DIS 13350:2018(E)
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NOTIFICATION OF ANY RELEVANT PATENT
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©
PROVIDE SUPPORTING DOCUMENTATION. ISO 2018

ISO/DIS 13350:2018(E)
© ISO 2018
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ii © ISO 2018 – All rights reserved

ISO/DIS 13350:2018(E)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 5
5 Characteristics to be measured . 6
5.1 General . 6
5.2 Thrust. 6
5.3 Input power . 7
5.4 Sound levels . 7
5.5 Vibration velocity. 7
5.6 Volume flowrate . 7
6 Instrumentation and measurements . 7
6.1 Dimension and areas . 7
6.2 Rotational speed . 7
6.3 Thrust. 7
6.3.1 Force balance systems . . . 7
6.3.2 Force transducers. 7
6.4 Input power . 7
6.5 Sound level . 8
6.6 Vibration velocity. 8
6.7 Volume flowrate . 8
6.7.1 Instruments for the measurement of pressure . 8
6.7.2 Instruments for the measurement of temperature . 8
7 Determination of thrust . 8
7.1 General . 8
7.2 Suspended configuration . 8
7.3 Supported configuration .10
7.4 Test procedures .13
7.5 Test enclosure .14
8 Determination of sound level .14
8.1 General .14
8.2 Fan specific sound measuring standards .15
8.3 Acoustic standards of the ISO 3740-Series and ISO 9614 Sound Intensity methods .15
9 Determination of vibration velocity .16
9.1 General .16
9.2 Test arrangement .16
9.3 Test procedure .16
9.4 Acceptance vibration velocity .16
10 Determination of flowrate .16
10.1 General .16
10.2 Upstream chamber method .17
10.3 Upstream Pitot traverse method .18
10.4 Directly connected flowrate-measuring device .18
11 Presentation of results .20
11.1 Product description .20
11.2 Product performance .21
12 Tolerances and conversion rules .21
ISO/DIS 13350:2018(E)
12.1 Tolerances .21
12.2 Conversion rules .21
Annex A (normative) A practical method commonly used for the determination of sound level .24
Annex B (informative) Illustration of reference sound source .27
Annex C (informative) Correction of sound pressure levels .28
Annex D (informative) Non-dimensional coefficients .29
Annex E (normative) Efficiency based on thrust measurements .31
Bibliography .33
iv © ISO 2018 – All rights reserved

ISO/DIS 13350:2018(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 can 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 meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO's adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 117, Fans.
This third edition cancels and replaces the second edition (ISO 13350:2015) which has been technically
revised. The main changes are the following:
— General (dated references on standards updated, e.g. ISO 5801:2017);
— 8.1 “Determination of sound level” (Introduction of possibility to use other International Standards e.g.
ISO 13347);
— 8.3 “Enclosure suitability” (requirement on running speed of the reference sound source deleted);
— Annex A (normative) (new normative Annex on “A practical method commonly used for the
determination of sound level”).
ISO/DIS 13350:2018(E)
Introduction
The need for a new edition of ISO 13350 has been evident for some time. The use of the so-called
jet fan to assist in the control of quality of air in vehicle and train tunnels has become increasingly
popular. Longitudinal methods of ventilation can show advantages in both capital cost and running cost
compared to alternative systems. Smoke and pollution control in emergency conditions can be readily
provided. Jet fans can also be used for ventilation and smoke control in enclosed car parks.
This International Standard deals with the determination of those performance criteria essential to the
correct application of jet fans. In describing the test and rating procedures, numerous references are
made to ISO 5801 as well as to other relevant International Standards.
vi © ISO 2018 – All rights reserved

DRAFT INTERNATIONAL STANDARD ISO/DIS 13350:2018(E)
Fans — Performance testing of jet fans
1 Scope
This International Standard deals with the determination of those technical characteristics needed
to describe all aspects of the performance of jet fans as defined in ISO 13349. It does not cover those
fans designed for ducted applications, nor those designed solely for air circulation, e.g. ceiling fans and
table fans.
The test procedures described in this International Standard relate to laboratory conditions. The
measurement of performance under on-site conditions is not included.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 1940-1, Mechanical vibration — Balance quality requirements for rotors in a constant (rigid) state —
Part 1: Specification and verification of balance tolerances
ISO 3744, Acoustics — Determination of sound power levels and sound energy levels of noise sources using
sound pressure — Engineering methods for an essentially free field over a reflecting plane
ISO 5801:2007, Industrial fans — Performance testing using standardized airways
ISO 13347 (all parts), Industrial fans — Determination of fan sound power levels under standardized
laboratory conditions
ISO 3740 (all parts), Acoustics — Determination of sound power levels of noise sources
ISO 13349, Fans — Vocabulary and definitions of categories
ISO 14694, Industrial fans — Specifications for balance quality and vibration levels
ISO 14695, Industrial fans — Method of measurement of fan vibration
IEC 60034-2-1, Rotating electrical machines — Part 2-1: Standard methods for determining losses and
efficiency from tests (excluding machines for traction vehicles)
IEC 60034-14, Rotating electrical machines — Part 14: Mechanical vibration of certain machines with shaft
heights 56 mm and higher — Measurement, evaluation and limits of the vibration severity
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 13349, ISO 5801 and the
following apply.
ISO/DIS 13350:2018(E)
3.1
jet fan
fan used for producing a jet of air in a space and not connected to any ducting, that is type E category/
configuration. Performance must only be expressed as thrust and efficiency is determined from thrust
measurement or calculation. Performance characteristics relating to pressure development are not
compliant
Note 1 to entry: The air jet can be used, for example, for adding momentum to the air within a tunnel or other
space (e.g. enclosed car park), or for intensifying the heat transfer in a determined zone.
Key
a flow of air
Figure 1a — Example of axial jet fan
Key
1 inlet
2 discharge
Figure 1b — Example of centrifugal jet fan
3.2
effective fan dynamic pressure
p
d
conventional quantity representative of the dynamic component of the fan output, calculated, in the
particular case of a jet fan, from the effective fan outlet velocity and the inlet density
Note 1 to entry: The effective fan dynamic pressure will not be the same as the average of the dynamic pressures
across the section because it excludes from consideration that part of the dynamic energy flux, which is due only
to departures from uniform axial velocity distribution.
3.2.1
gross fan outlet area
A
surface plane bounded by the downstream extremity of the air-moving device
Note 1 to entry: Gross fan outlet area is, by convention, taken as the gross area in the outlet plane inside the
casing or duct or silencer, (see Figure 1) without taken into account any obstructions inside the fan outlet.
2 © ISO 2018 – All rights reserved

ISO/DIS 13350:2018(E)
3.2.2
effective fan outlet area
A
eff
outlet area with deductions for motors, fairings, or other obstructions (in the particular case
of a jet fan)
Note 1 to entry: If the silencer centrebody reaches the outlet plane of the fan, then, the effective fan outlet area is
defined as the annulus area at the fan outlet plane, as shown in Figure 2a).
Note 2 to entry: If the fan has a silencer without centrebody [see Figure 2b)], the effective fan outlet area will be
close to the cross- sectional area inside the silencer in order to clear any exit bellmouth form.
Note 3 to entry: If the centrebody (motor or silencer core) does not extend to the outlet plane, the effective fan
outlet area will approach the annulus area between the casing and the motor, but with some increase, as defined
in Figure 2c), for the distance between the centrebody and the outlet. Where the motor is on the upstream side,
Figure 2c) is applied to the impeller hub rather than the motor, as illustrated.
Note 4 to entry: For comparisons within the scope of research and development, alternative definitions have
been used with some success.
Figure 2 — Gross and effective fan outlet areas
3.3
effective fan outlet velocity
v
eff
velocity calculated from thrust at standard conditions, the standard air density, and the effective fan
outlet area
Note 1 to entry: See 11.2.
3.4
fan outlet velocity
v
velocity calculated from the thrust at standard conditions, divided by gross fan outlet area, A
3.5.1
motor input power
P
e
electrical power supplied at the terminals of the electric motor drive
3.5.2
impeller power
P
r
mechanical power supplied to the impeller of the fan
ISO/DIS 13350:2018(E)
3.5.3
fan air power
P
u
conventional power output at standard conditions; in the particular case of a jet fan, product of inlet
volume flow and effective fan dynamic pressure
3.6
impeller tip speed
v
p
peripheral speed of the impeller blade tips
3.7
thrust
T , T
m c
fan thrust measured (T ) or calculated (T ) in accordance with this International Standard at standard
m c
conditions
3.8.1
thrust/impeller power ratio
r
r
thrust divided by impeller power
Note 1 to entry: The thrust/impeller power ratio is calculated as r = T /P .
r m r
3.8.2
thrust/motor input power ratio
r
e
thrust divided by motor input power
Note 1 to entry: The thrust/motor input power ratio is calculated as r = T /P .
e m e
3.9
fan guard
guard designed to prevent the ingestion of relatively large foreign bodies, such as drink cans, and
sometimes fitted to the inlet and outlet of jet fans
Note 1 to entry: Guards can have a marked effect on the thrust performance and noise level. Where they are
specified, measurements should be made with these guards in place.
3.10
chamber
airway in which the air velocity is small compared with that at the fan inlet or outlet
3.11
test enclosure
room, or other space protected from draught, in which the fan and test airways are situated
3.12
impeller balance grade
G grade as specified in ISO 14694
3.13
fan vibration velocity
unfiltered root mean square (r.m.s.) vibration velocity over the frequency range 10 Hz to 10 kHz
measured in accordance with this International Standard and with ISO 14695
3.14
fan impeller efficiency
η
r
fan air power divided by impeller power
4 © ISO 2018 – All rights reserved

ISO/DIS 13350:2018(E)
3.15
fan overall efficiency
η
e
fan air power divided by motor input power
3.16
sound pressure level
L
p
ten times the logarithm to the base 10 of the ratio of the square of the sound pressure radiated by the
sound source under test to the square of the reference sound pressure
3.17
sound power level
L
W
ten times the logarithm to the base 10 of the ratio of the sound power radiated by the sound source
under test to the reference sound power
3.18
inlet sound power level
L (in)
W
sound power level of the fan determined at the fan inlet
3.19
outlet sound power level
L (out)
W
sound power level of the fan determined at the fan outlet
3.20
total sound power level
L (tot)
W
sound power level determined for the entire fan which includes the inlet and outlet sound power levels
3.21
noise frequency range of interest
frequency range including the octave bands with centre frequencies between 63 Hz and
8 000 Hz and the one-third octave bands with centre frequencies between 50 Hz and 10 000 Hz
4 Symbols and abbreviated terms
The following symbols and units shall apply for the parameters listed.
Abbreviated term/represented quantity Symbol SI unit
Impeller annulus area A m
a
Gross fan outlet area A m
Effective fan outlet area A m
eff
Nominal fan diameter D m
R
Length of upstream chamber side D m
Sound pressure level L dB (re 20 μPa)
p
Average sound pressure level of the measured device L dB (re 20 μPa)
p(m)
Average sound pressure level of the reference sound source L dB (re 20 μPa)
p(r)
Sound power level L dB (re 1 pW)
W
Inlet sound power level L (in) dB (re 1 pW)
W
Outlet sound power level L (out) dB (re 1 pW)
W
Total sound power level L (tot) dB (re 1 pW)
W
Sound power level of the reference sound source L dB (re 1 pW)
W(r)
Rotational speed n revolution/s
ISO/DIS 13350:2018(E)
Abbreviated term/represented quantity Symbol SI unit
Differential pressure across a flow measuring device p Pa
Gauge pressure at the fan outlet p Pa
e2
Gauge pressure in the fan chamber p Pa
e2
Effective fan dynamic pressure p Pa
d
Volume flow q m /s
v
Impeller balance grade (ISO 14694) G μm
Motor input power P W
e
Impeller power P W
r
Fan air power P W
u
Thrust/impeller power ratio r N/W
r
Thrust/motor input power ratio r N/W
e
Non-dimensional thrust/power ratio r —
t
Calculated thrust T N
c
Measured thrust T N
m
Impeller tip speed v m/s
p
Effective fan outlet velocity v m/s
eff
Fan outlet velocity v m/s
Mean throughflow velocity in a tunnel at a specified section v m/s
t
Total pressure rise Δp Pa
3 3
Standard air density 1,2 kg/m ρ kg/m
Inlet density taken as equal to the density in the test enclosure ρ kg/m
a
Fan overall efficiency η —
e
Motor efficiency η —
m
Fan impeller efficiency η —
r
Fan overall efficiency based on thrust η (T) —
e
Fan impeller efficiency based on thrust η (T) —
r
Flow coefficient φ —
Thrust coefficient Θ —
Power coefficient ϕ —
r
NOTE   (T) denotes the term or quantity stated to be a function of the thrust (see Annex E). Example: η (T) is the fan
e
overall efficiency based on thrust.
5 Characteristics to be measured
5.1 General
In order that a jet fan be correctly applied and give satisfactory performance and reliability in service,
it is necessary to determine a number of technical performance characteristics in addition to knowing
the more obvious mechanical features, such as mass, overall dimensions, and installation dimensions.
5.2 Thrust
Friction on the tunnel walls, inlet, and outlet losses and sometimes traffic drag, combined with climatic
effects at tunnel portals, create a pressure drop through the tunnel. The pressure drop is matched by
the sum of the pressure increases by the jet fans due to the momentum transfer between fan discharge
airflow and airflow in the tunnel. As it is impossible to measure the momentum of the fan discharge
airflow, and the rate of change in momentum is equal and opposite to the thrust, thrust is measured
instead.
6 © ISO 2018 – All rights reserved

ISO/DIS 13350:2018(E)
5.3 Input power
In order to design the tunnel installation, it is necessary to know the input power to the fan motor. Also,
it is needed to determine the overall efficiency of the jet fan.
5.4 Sound levels
Sound levels, usually at inlet and outlet, are established in order to ensure that the jet fan and silencer
combination is optimized to match the tunnel sound level requirements.
NOTE The fan manufacturer can only guarantee the sound power level of the fan. The sound pressure in
the tunnel will depend on the size and sound absorption characteristics of the tunnel, which are outside the fan
manufacturer's responsibility.
5.5 Vibration velocity
For reasons of safety, reliability, and maintainability, it is essential that a realistic vibration velocity is
specified and recorded on jet fans. These shall be measured in accordance with ISO 14695.
5.6 Volume flowrate
Volume flowrate need only be measured if required for contractual reasons. It is the effective fan outlet
velocity which is used to evaluate the optimum number, size, and spacing of jet fans in a tunnel, and is
calculated in accordance with 11.2.
6 Instrumentation and measurements
6.1 Dimension and areas
The measurement of dimensions and the determination of areas shall be in accordance with
ISO 5801:2007, Clause 11.
6.2 Rotational speed
The rotational speed of the impeller shall be determined in accordance with ISO 5801:2007, Clause 9.
6.3 Thrust
6.3.1 Force balance systems
By the use of calibrated weights, force balance systems shall permit the determination of force or thrust
with an uncertainty of ±5 %.
6.3.2 Force transducers
After calibration by the use of calibrated weights, force transducers shall permit the determination of
thrust with an uncertainty of ±5 %.
6.4 Input power
Determination of the power input to the electric motor or to the impeller shall be carried out in
accordance with ISO 5801:2007, Clause 10. P and P are determined by correcting the measured power
e r
for a density of 1,2 kg/m .
ISO/DIS 13350:2018(E)
6.5 Sound level
The sound-level measuring system, including microphones, windshields, cables, amplifiers, and
frequency analyser, shall be in accordance with the requirements given in ISO 13347.
6.6 Vibration velocity
Instruments to measure root mean square (r.m.s.) vibration velocity shall be used to record fan
vibration velocities. These shall be in accordance with ISO 14695.
6.7 Volume flowrate
6.7.1 Instruments for the measurement of pressure
Manometers for the measurement of differential pressure and barometers for the measurement
of atmospheric pressure in the test enclosure shall comply with the requirements of ISO 5801:2007,
Clause 6.
6.7.2 Instruments for the measurement of temperature
Thermometers shall comply with the requirements of ISO 5801:2007, Clause 8.
7 Determination of thrust
7.1 General
There are two basic configurations acceptable for the determination of fan thrust, T , by direct
m
measurement, these are
— suspended configuration, and
— supported configuration.
T is determined by correcting the measured thrust value for a density of 1,2 kg/m , i.e.
m
3 3
T = Thrust · 1,2 [kg/m ]/ρ [kg/m ].
m measured a
In addition to the need to measure force accurately, the first method requires that the low friction
suspension elements be kept precisely vertical and parallel with a vertical plane(s) passing through
the fan axis, while the second method requires accurate construction, low friction, and levelling of the
support assembly. In either case, thrust shall be determined by the use of calibrated weights, spring
balance, or force
...