FprEN ISO 12759-2

SLOVENSKI STANDARD
oSIST prEN ISO 12759-2:2017
01-oktober-2017
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Fans - Efficiency classification for fans - Part 2: Standard losses for drive components
(ISO/DIS 12759-2:2017)
Ventilatoren - Effizienzklassifizierung für Ventilatoren - Teil 2: Standardverluste für
Antriebskomponenten (ISO/DIS 12759-2:2017)
Ventilateurs - Classification du rendement des ventilateurs - Partie 2: Détermination à
charge partielle (ISO/DIS 12759-2:2017)
Ta slovenski standard je istoveten z: prEN ISO 12759-2
ICS:
23.120 =UDþQLNL9HWUQLNL.OLPDWVNH Ventilators. Fans. Air-
QDSUDYH conditioners
oSIST prEN ISO 12759-2:2017 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN ISO 12759-2:2017
oSIST prEN ISO 12759-2:2017
DRAFT INTERNATIONAL STANDARD
ISO/DIS 12759-2
ISO/TC 117 Secretariat: BSI
Voting begins on: Voting terminates on:
2017-07-28 2017-10-19
Fans — Efficiency classification for fans —
Part 2:
Standard losses for drive components
Ventilateurs — Classification du rendement des ventilateurs —
Partie 2: Titre manque
ICS: 23.120
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
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THEREFORE SUBJECT TO CHANGE AND MAY
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ISO/DIS 12759-2:2017(E)
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©
PROVIDE SUPPORTING DOCUMENTATION. ISO 2017

oSIST prEN ISO 12759-2:2017
ISO/DIS 12759-2:2017(E)
© ISO 2017, Published in Switzerland
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ii © ISO 2017 – All rights reserved

oSIST prEN ISO 12759-2:2017
ISO/DIS 12759-2:2017(E)
Contents  Page
Foreword .iv
Introduction .v
1  Scope . 1
2  Normative references . 1
3  Terms and definitions . 1
3.1 Fan system . 1
4  Fan system energy calculations . 2
4.1 Components . 2
4.1.1 Fan . 2
4.1.2 Power transmission. 3
4.1.3 Motor and controller . 3
4.2 System integration . 6
5  Reporting of results . 6
Annex A normative. 8
Annex B informative . 9
Annex C normative .10
Annex D informative .11
Annex E informative .12
Annex F normative .13
Annex G informative .14
Annex H normative .15
Annex I informative .16
Annex J normative .17
Bibliography .18
oSIST prEN ISO 12759-2:2017
ISO/DIS 12759-2:2017(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. www .iso .org/ directives
Attention is drawn to the possibility that some of the elements of this document may be the subject of
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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. 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.
iv © ISO 2017 – All rights reserved

oSIST prEN ISO 12759-2:2017
ISO/DIS 12759-2:2017(E)
Introduction
This standard provides a method to estimate the input power and overall efficiency of an extended
fan system.
An extended fan system is composed of a fan and an electric motor, but may also include a transmission
and a motor controller. While direct measurement of fan system performance is preferred, the
large number of fan system configurations often makes testing impractical. This standard offers a
standardized method to estimate fan system performance by modelling commonly used components.
Calculations reported in accordance with this standard offer fan users a tool to compare alternative fan
system configurations in a consistent and uniform manner.
oSIST prEN ISO 12759-2:2017
oSIST prEN ISO 12759-2:2017
DRAFT INTERNATIONAL STANDARD ISO/DIS 12759-2:2017(E)
Fans — Efficiency classification for fans —
Part 2:
Standard losses for drive components
1  Scope
The scope of this standard includes all electric motor driven fan systems that utilize a specific
combination of components as defined below:
1) Fan airflow performance tested in accordance with ISO/Standard 5801, Industrial fans --
Performance Testing Using Standardized Airways.
2) Polyphase induction motors within the scope of the US Energy Independence and Security Act of
2007, IEC 60034-30, Rotating electrical machines - Part 30-1: Efficiency classes of line operated AC
motors, or GB 18613, Minimum Allowable Values of Energy Efficiency and Energy Efficiency Grades
for Small and Medium Three-Phase Asynchronous Motors. Other types of motors are explicitly
excluded.
3) Pulse-width modulated variable frequency drives (VFD) for use with single motors. Single VFDs
that service multiple, parallel fan motors are excluded.
4) Mechanical power transmissions that utilize V-belts, flat belts, cog belts, or couplings.
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 5801, Industrial fans ― Performance testing using standardised airways
ISO 5802, Industrial fans — Performance testing in situ
ISO 13348, Industrial fans — Tolerances, methods of conversion and technical data presentation
ISO 13349, Fans — Vocabulary and definitions of categories
IEC 60034-2-1:2008, Rotating electrical machines ― Part 2-1: Standard methods for determining losses
and efficiency from tests (excluding machines for traction vehicles)
IEC 60034-30-1, Rotating electrical machines ― Part 30-1: Efficiency classes of line operated AC motors
3  Terms and definitions
3.1  Fan system
A fan product that includes all appurtenances, accessories, motors, drives and controllers necessary or
applied to the fan.
See Table 1 for symbols and subscripts.
oSIST prEN ISO 12759-2:2017
ISO/DIS 12759-2:2017(E)
Table 1 — Symbols and Subscripts
Symbol Description Unit
η Transmission efficiency (see note) dimensionless
T
η Motor efficiency dimensionless
m
η Regulated (nominal) motor efficiency dimensionless
mreg
η Motor controller efficiency dimensionless
c
η Overall static efficiency dimensionless
es
η Overall efficiency dimensionless
e
η Combined motor and motor control efficiency dimensionless
mc
P Fan system input power kW
e
P Fan input power kW
a
P Fan output power kW
u
P Motor output power kW
mo
P Motor rated output power (nameplate) kW
mrat
P Motor input power kW
mi
P Motor controller output power kW
co
P Motor controller rated output power kW
crat
L Motor load ratio dimensionless
m
L Motor controller load ratio dimensionless
c
N Fan speed rpm
f Mains line frequency Hz
L
η Fan static efficiency dimensionless
s
η Fan efficiency dimensionless
n Number of poles in induction motor dimensionless
NOTE The symbol η , transmission efficiency, should not be confused with η , fan efficiency.
T
4  Fan system energy calculations
This section describes the calculations required to estimate the extended fan system input power and
overall extended fan system efficiency. Calculations start with the fan performance and then progress
to each fan system component.
4.1  Components
4.1.1 Fan
Fan input power, P , is the starting point for the system calculation. Fan performance shall be determined
a
in accordance with an accepted performance standard such as ISO 5801 or AMCA Standard 260. The
fan laws and ISO 13348 shall be used to determine fan performance at operating conditions other than
those tested. For calculation of fan system input power (P ), the following performance variables must
e
be available for the desired fan operating point:
P Fan input power
a
N Fan speed
To calculate the overall fan system efficiency, the following must also be available:
η Fan static efficiency
s
or
2 © ISO 2017 – All rights reserved

oSIST prEN ISO 12759-2:2017
ISO/DIS 12759-2:2017(E)
η Fan efficiency
4.1.2  Power transmission
The power transmission is a component of the fan system that transfers power from the motor to the
fan, often involving a speed change.
4.1.2.1  V-belt power transmission
The efficiency of a v-belt transmission is calculated as
00. 5
 
P
a
η =09. 6
 
T
P +16. 4
a
 
4.1.2.2  Cog Belt transmission
The efficiency of a flat or cog belt is calculated as
P <= 1kW, η
a T = 0.94
1 kW < P < 5kw, η P + 0.93
a T = 0.01 a
P => 5kw, η
a T = 0.98
4.1.2.3  Coupling
The efficiency of a coupling is calculated as
η =09. 8
T
4.1.2.4  No power transmission
If there is no power transmission and the fan impeller is directly coupled to the motor, then
η =1
T
4.1.3  Motor and controller
The following sections detail the calculations for various motor and motor/controller combinations. Fan
systems incorporating components other than those described here are not covered by this standard.
4.1.3.1  Regulated polyphase induction motors controlled by a VFD
Calculations presented here are limited to certain regulated polyphase induction motors driven by
pulse-width modulated variable frequency drives at the drive’s rated nameplate voltage.
The following motor and component parameters must be known:
P Motor nameplate output power
mrat
n number of motor poles
f line frequency
L
Motor enclosure TEFC or ODP
oSIST prEN ISO 12759-2:2017
ISO/DIS 12759-2:2017(E)
P Motor controller rated output power
crat
TEAO motors are not covered by this standard. The calculation here combines both the motor and
variable frequency drive efficiency into a single value. This is valid only if the VFD is sized for the
intended motor. VFD’s having capacity greater than the motor rating are not considered. It is assumed
that the VFD is operating with a constant V/Hz output for drive frequencies less than line frequency, and
at constant voltage above the line frequency. This is typical. Other control algorithms are not covered
by this standard.
The motor output power at the fan operating point is calculated by
P = P /η
mo a T
The combined motor and VFD efficiency is calculated as
  
aL dL
m 2 c
η =η +cL + fL
  
mc mreg m c
bL+ eL+
 m  c
 
where
η is the nominal motor efficiency obtained from Informative Annex B or Normative Annex C or
mreg
Informative Annex D, depending on the applicable motor configuration and regulatory jurisdiction. L
m
is the motor load ratio calculated by
L = P /P
m mo mrat
and
a and b are coefficients obtained from Informative Annex E or Normative Annex F depending on the
applicable motor configuration.
The coefficient c is calculated as
a
c=−1
b+1
The coefficients d, e and f a
...