Ventilation for buildings - Performance testing of components/products for residential ventilation - Part 8: Performance testing of non-ducted mechanical supply and exhaust ventilation units (including heat recovery)

This document specifies the laboratory test methods and test requirements for the testing of aerodynamic, thermal, acoustic and the electrical performance characteristics of non-ducted mechanical supply and exhaust ventilation units used in single dwellings.
The purpose of this document is not to consider the quality of ventilation but to test the performance of the equipment.
In general, a ventilation unit contains:
-   fans for mechanical supply and exhaust;
-   air filters;
-   air-to-air heat exchanger for heat and possibly humidity recovery;
-   control system;
-   inlet and outlet grilles.
Such equipment can be provided in more than one assembly, the separate assemblies of which are designed to be used together.
Such equipment can contain alternating heat exchangers which provide separate supply and exhaust air flows.
In certain cases, i.e. alternating ventilation unit, the manufacturer may declare that the equipment can be installed in such a way that it serves more than one room. For the purpose of this document, these products are assessed in a single room.
This document does not deal with ducted units or units with heat pumps.
Safety requirements are given in EN 60335 2 40 and EN 60335 2 80.

Lüftung von Gebäuden - Leistungsprüfung von Bauteilen/Produkten für die Lüftung von Wohnungen - Teil 8: Leistungsprüfung von mechanischen Zuluft‐ und Ablufteinheiten ohne Luftführung (einschließlich Wärmerückgewinnung)

Dieses Dokument legt die Laborprüfverfahren und die Anforderungen an die Prüfung der aerodynamischen, thermischen und akustischen sowie der elektrischen Leistung von mechanischen Zuluft- und Fortluftgeräten für Wohnungen zur Verwendung in individuellen Wohneinheiten fest.
Der Zweck dieses Dokuments besteht nicht in der Feststellung der Qualität der Lüftung, sondern in der Prüfung der Leistung der Ausrüstung.
Im Allgemeinen besteht ein Lüftungsgerät aus:
-   Ventilatoren für mechanische Zuluft- und Fortlufteinheiten;
-   Luftfilter;
-   Luft-Luft-Wärmeübertrager zur Wärme- und möglicherweise Feuchterückgewinnung;
-   Steuer und Regeleinrichtungen;
-   Luftdurchlässe für Einström-/Ausströmöffnungen.
Eine derartige Ausrüstung kann in mehr als einer Baugruppe geliefert werden, wobei die einzelnen Baugruppen für die gemeinsame Verwendung ausgelegt sind.
Eine derartige Ausrüstung kann Umschalt-Wärmeübertrager mit getrennten Zuluft- und Fortluftströmen umfassen.
In bestimmten Fällen, d. h. bei einer Umschalt-Lüftungseinheit, darf angegeben werden, dass die Ausrüstung so eingebaut werden kann, dass sie mehr als einen Raum versorgt. Für die Anwendung dieses Dokuments werden die entsprechenden Produkte in einem einzelnen Raum bewertet.
Einheiten mit Luftleitung oder mit Wärmepumpen werden nicht in diesem Dokument, sondern in prEN 13141-7 behandelt.
Entsprechende Sicherheitsanforderungen können EN 60335-2-40 und EN 60335-2-80 entnommen werden.

Ventilation des bâtiments - Essais de performance des composants/produits pour la ventilation des logements - Partie 8 : Essais de performance des unités de ventilation double flux décentralisées (y compris la récupération de chaleur)

Le présent document spécifie les méthodes d’essai de laboratoire et les exigences d'essai pour les essais des caractéristiques de performances aérauliques, thermiques, acoustiques et électriques des unités de ventilation double flux décentralisées utilisées dans les logements individuels.
L’objet du présent document n’est pas d’estimer la qualité de la ventilation mais de soumettre à essai la performance de l'équipement.
Le présent document est applicable aux unités de ventilation, ces dernières :
a) comprenant soit :
- des ventilateurs pour l'insufflation et l'extraction mécaniques ;
- des filtres à air ;
- un échangeur de chaleur air-air pour la récupération de chaleur et éventuellement d'humidité ;
- un système de commande ;
- des grilles d'entrée et de sortie ; ou
- des échangeurs de chaleur alternatifs fournissant des flux d’air de soufflage et d’extraction séparés ;
b) fournies soit :
- en un assemblage ; ou
- en plus d’un assemblage, chacun de ces assemblages étant conçus pour être utilisés ensemble.
Le présent document ne traite pas des centrales qui sont couvertes par l’EN 13141-7 ou des unités avec pompes à chaleur.
Les exigences de sécurité sont données dans l’EN 60335-2-40 et l’EN 60335-2-80.

Prezračevanje stavb - Preskušanje lastnosti sestavnih delov/izdelkov za prezračevanje stanovanjskih stavb - 8. del: Preskušanje lastnosti mehanskih brezkanalnih dovodnih in odvodnih prezračevalnih enot (vključno z enotami za vračanje toplote)

General Information

Status
Published
Public Enquiry End Date
01-Feb-2021
Publication Date
18-Sep-2022
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
14-Sep-2022
Due Date
19-Nov-2022
Completion Date
19-Sep-2022

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SLOVENSKI STANDARD
SIST EN 13141-8:2022
01-november-2022
Nadomešča:
SIST EN 13141-8:2014
Prezračevanje stavb - Preskušanje lastnosti sestavnih delov/izdelkov za
prezračevanje stanovanjskih stavb - 8. del: Preskušanje lastnosti mehanskih
brezkanalnih dovodnih in odvodnih prezračevalnih enot (vključno z enotami za
vračanje toplote)

Ventilation for buildings - Performance testing of components/products for residential

ventilation - Part 8: Performance testing of non-ducted mechanical supply and exhaust

ventilation units (including heat recovery)

Lüftung von Gebäuden - Leistungsprüfung von Bauteilen/Produkten für die Lüftung von

Wohnungen - Teil 8: Leistungsprüfung von mechanischen Zuluft‐ und Ablufteinheiten

ohne Luftführung (einschließlich Wärmerückgewinnung)

Ventilation des bâtiments - Essais de performance des composants/produits pour la

ventilation des logements - Partie 8 : Essais de performance des unités de ventilation

double flux décentralisées (y compris la récupération de chaleur)
Ta slovenski standard je istoveten z: EN 13141-8:2022
ICS:
91.140.30 Prezračevalni in klimatski Ventilation and air-
sistemi conditioning systems
SIST EN 13141-8:2022 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 13141-8:2022
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SIST EN 13141-8:2022
EN 13141-8
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2022
EUROPÄISCHE NORM
ICS 91.140.30 Supersedes EN 13141-8:2014
English Version
Ventilation for buildings - Performance testing of
components/products for residential ventilation - Part 8:
Performance testing of non-ducted mechanical supply and
exhaust ventilation units (including heat recovery)

Ventilation des bâtiments - Essais de performance des Lüftung von Gebäuden - Leistungsprüfungen von

composants/produits pour la ventilation des Bauteilen/Produkten für die Lüftung von Wohnungen -

logements - Partie 8 : Essais de performance des unités Teil 8: Leistungsprüfung von mechanischen Zuluft- und

de ventilation double flux décentralisées (y compris la Ablufteinheiten ohne Luftführung (einschließlich

récupération de chaleur) Wärmerückgewinnung)
This European Standard was approved by CEN on 10 January 2022.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13141-8:2022 E

worldwide for CEN national Members.
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SIST EN 13141-8:2022
EN 13141-8:2022 (E)
Contents Page

European foreword ....................................................................................................................................................... 4

Introduction .................................................................................................................................................................... 6

1 Scope .................................................................................................................................................................... 8

2 Normative references .................................................................................................................................... 9

3 Terms and definitions ................................................................................................................................... 9

4 Symbols and abbreviations ...................................................................................................................... 14

5 Categories of heat exchangers ................................................................................................................. 18

6 Requirements ................................................................................................................................................ 19

7 Test methods ................................................................................................................................................. 20

7.1 General ............................................................................................................................................................. 20

7.2 Performance testing of aerodynamic characteristics ..................................................................... 20

7.2.1 Leakages, mixing and air transfer .......................................................................................................... 20

7.2.2 In/out airtightness ...................................................................................................................................... 23

7.2.3 Filter bypass ................................................................................................................................................... 23

7.2.4 Air flow ............................................................................................................................................................. 23

7.2.5 Electrical power input ................................................................................................................................ 26

7.3 Performance testing of thermal characteristics ............................................................................... 27

7.3.1 General ............................................................................................................................................................. 27

7.3.2 Test operating conditions ......................................................................................................................... 27

7.3.3 Temperature conditions ............................................................................................................................ 28

7.3.4 Test procedure .............................................................................................................................................. 29

7.3.5 Evaluation on supply air side (mandatory measurement) excluding alternating

ventilation units ........................................................................................................................................... 30

7.3.6 Evaluation on exhaust air side (optional measurement) excluding alternating

ventilation units ........................................................................................................................................... 31

7.4 Deviating aspects concerning alternating ventilation units ........................................................ 31

7.4.1 General ............................................................................................................................................................. 31

7.4.2 Internal leakage - Exhaust air transfer ratio ...................................................................................... 31

7.4.3 Determination of air volume flow .......................................................................................................... 32

7.4.4 Electrical power input ................................................................................................................................ 36

7.4.5 Performance testing of thermal characteristics ............................................................................... 36

8 Classification .................................................................................................................................................. 42

8.1 Leakage classification ................................................................................................................................. 42

8.2 Air flow sensitivity classification............................................................................................................ 43

8.3 Indoor/outdoor airtightness of the complete unit .......................................................................... 44

9 Performance testing of acoustic characteristics ............................................................................... 44

9.1 General ............................................................................................................................................................. 44

9.2 Radiative sound power in the indoor or outdoor space ................................................................ 44

9.2.1 General ............................................................................................................................................................. 44

9.2.2 Reverberant room method ....................................................................................................................... 45

9.2.3 Anechoic or semi-anechoic room method ........................................................................................... 45

9.2.4 Free field method ......................................................................................................................................... 45

9.3 Airborne sound insulation ........................................................................................................................ 46

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SIST EN 13141-8:2022
EN 13141-8:2022 (E)

10 Test results ...................................................................................................................................................... 47

10.1 Test report ...................................................................................................................................................... 47

10.2 Product specifications................................................................................................................................. 47

10.3 Additional information related to the performance of the product .......................................... 47

10.4 Leakages ........................................................................................................................................................... 47

10.5 Filter bypass ................................................................................................................................................... 48

10.6 Air flow ............................................................................................................................................................. 49

10.7 Effective power input .................................................................................................................................. 49

10.8 Temperature and humidity ratios .......................................................................................................... 50

10.9 Acoustic characteristics ............................................................................................................................. 50

Annex A (normative) Test layouts ....................................................................................................................... 52

Annex B (normative) Pressure leakage test method .................................................................................... 55

B.1 General ............................................................................................................................................................. 55

B.2 External leakage test ................................................................................................................................... 55

B.3 Internal leakage test .................................................................................................................................... 56

Annex C (normative) Indoor mixing ................................................................................................................... 57

C.1 General ............................................................................................................................................................. 57

C.2 Determination of indoor mixing - First test ........................................................................................ 57

C.3 Determination of indoor mixing - Second test ................................................................................... 57

C.4 Indoor mixing calculation ......................................................................................................................... 57

Bibliography ................................................................................................................................................................. 58

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SIST EN 13141-8:2022
EN 13141-8:2022 (E)
European foreword

This document (EN 13141-8:2022) has been prepared 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 March 2023, and conflicting national standards shall be

withdrawn at the latest by March 2023.

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 13141-8:2014.

In addition to a number of editorial revisions, the following main changes have been made with respect

to EN 13141-8:2014:

— scope has been changed, and concerns now also non-ducted units which ventilate more than one

single room;

— terms and definitions as well as symbols and abbreviations have been updated in accordance with

the parameters used in the document;
— new categories of heat exchanger have been added;
— designations in 7.2.1.4 and the Formulae (1) to (4) have been changed;

— reference of the internal and external leakage rates has been changes to the reference air volume

flow;
— extrapolation of the leakage rates has been added;
— 7.2.1.3.2 concerning exhaust air transfer ratio has been added;
— 7.2.4 concerning air flow measurement has been revised;

— requirements to convert the measured values to standard conditions have been added in 7.2.4 and

7.3.2;

— 7.3.3 has been divided into two separate subclauses 7.3.3.1 for standard tests and 7.3.3.2 for cold

climate tests;
— formulae to calculate the temperature ratios have been changed;
— wet bulb temperature for the cold climate test has been changed;

— the order of the specific test for alternating units including storage heat exchanges has been changed;

— deviating aspects for alternating units to determine the air flow correction, thermal performance and

the exhaust air transfer ratio have been revised;

— Table 10 concerning the temperature conditions for the cooling performance test has been moved in

EN 13142.
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SIST EN 13141-8:2022
EN 13141-8:2022 (E)

A list of all parts in the EN 13141 series, published under the general title Ventilation for buildings —

Performance testing of components/products for residential ventilation can be found on the CEN website.

Any feedback and questions on this document should be directed to the users’ national standards body.

A complete listing of these bodies can be found on the CEN website.

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,

Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,

Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North

Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the United

Kingdom.
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SIST EN 13141-8:2022
EN 13141-8:2022 (E)
Introduction

This document specifies methods for the performance testing of components used in residential

ventilation systems to establish the performance characteristics as identified in EN 13142.

This document incorporates many references to other European and International Standards, especially

on characteristics other than the aerodynamic characteristics, for instance on acoustic characteristics.

In most cases some additional tests or some additional conditions are given for the specific use in

residential ventilation systems.
This document can be used for the following applications:
— laboratory testing;
— attestation purposes.

The position of this document in the field of standards for the mechanical building services is shown

in Figure 1.
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SIST EN 13141-8:2022
EN 13141-8:2022 (E)

Figure 1 — Position of EN 13141-8 in the field of the mechanical building services

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SIST EN 13141-8:2022
EN 13141-8:2022 (E)
1 Scope

This document specifies the laboratory test methods and test requirements for the testing of

aerodynamic, thermal, acoustic and the electrical performance characteristics of non-ducted mechanical

supply and exhaust residential ventilation units used in single dwellings.

The purpose of this document is not to consider the quality of ventilation but to test the performance of

the equipment.
This document is applicable to ventilation units, the latter:
a) containing either:
— fans for mechanical supply and exhaust;
— air filters;
— air-to-air heat exchanger for heat and possibly humidity recovery;
— control system;
— inlet and outlet grilles; or

— alternating heat exchangers which provide separate supply and exhaust air flows;

b) provided either:
— in one assembly; or

— in more than one assembly, the separate assemblies of which are designed to be used together.

This document does not deal with ducted units which are covered by EN 13141-7 or units with heat

pumps.
Safety requirements are given in EN 60335-2-40 and EN 60335-2-80.
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SIST EN 13141-8:2022
EN 13141-8:2022 (E)
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.

EN 12792:2003, Ventilation for buildings - Symbols, terminology and graphical symbols

EN ISO 717-1, Acoustics - Rating of sound insulation in buildings and of building elements — Part 1:

Airborne sound insulation (ISO 717-1)
EN ISO 5801, Fans - Performance testing using standardized airways (ISO 5801)

EN ISO 10140-1, Acoustics - Laboratory measurement of sound insulation of building elements — Part 1:

Application rules for specific products (ISO 10140-1)

EN ISO 10140-2, Acoustics - Laboratory measurement of sound insulation of building elements — Part 2:

Measurement of airborne sound insulation (ISO 10140-2)

EN ISO 10140-4, Acoustics - Laboratory measurement of sound insulation of building elements — Part 4:

Measurement procedures and requirements (ISO 10140-4)

EN ISO 10140-5, Acoustics - Laboratory measurement of sound insulation of building elements — Part 5:

Requirements for test facilities and equipment (ISO 10140-5)

EN ISO 16890 (all parts), Air filters for general ventilation (ISO 16890 (all parts))

ISO 13347-2, Industrial fans - Determination of fan sound power levels under standardized laboratory

conditions - Part 2: Reverberant room method

ISO 13347-3, Industrial fans - Determination of fan sound power levels under standardized laboratory

conditions - Part 3: Enveloping surface methods

ISO 13347-4, Industrial fans - Determination of fan sound power levels under standardized laboratory

conditions - Part 4: Sound intensity method

EN ISO/IEC 17025:2017, General requirements for the competence of testing and calibration laboratories

(ISO/IEC 17025:2017)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 12792:2003 and the following

apply.

ISO and IEC maintain terminological databases for the use in standardization at the following addresses:

— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.1
external leakage

leakage to or from the air flowing inside the casing of the ventilation unit to or from the surrounding air

[SOURCE: EN 13141-4:2021, 3.11]
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SIST EN 13141-8:2022
EN 13141-8:2022 (E)
3.2
internal leakage
leakage inside the unit between the exhaust and the supply air flows
[SOURCE: EN 13141-7:2021, 3.2]
3.3
filter bypass leakage
air bypass around filter cells
[SOURCE: EN 13141-7:2021, 3.4]
3.4
indoor/outdoor airtightness
vio

maximum air volume flow between the indoor and the outdoor environments at static pressure

difference of –20 Pa and +20 Pa when the fans are “OFF” and all shutters are closed

Note 1 to entry: Indoor/outdoor airtightness is not the external leakage.

[SOURCE: EN 13141-4:2021, 3.13, modified – Removal of “through a non-ducted ventilation unit”,

“corresponding to the setting” and “additional”, adding of “between the indoor and the outdoor

environments”]
3.5
exhaust air transfer ratio

mass transfer of the discharged air to a zone from extract to supply that is actually recirculated air from

the same zone, due to internal leakage and external casing leakage
3.6
outdoor mixing

mixing of the two air flows external to the equipment under test between discharge and intake ports at

outdoor terminal points caused by short circuiting
3.7
indoor mixing

mixing of the two air flows external to the equipment under test between discharge and intake ports at

indoor terminal points caused by short circuiting
3.8
declared maximum air volume flow
vmax,d

declared maximum air volume flow of the unit at 0 Pa static pressure difference, between indoor and

outdoor

[SOURCE: EN 13141-4:2021, 3.6, modified – “at 0 Pa static pressure difference, between indoor and

outdoor” has been added]
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SIST EN 13141-8:2022
EN 13141-8:2022 (E)
3.9
maximum air volume flow
vmax

air volume flow corresponding to the maximum achievable fan curve setting of the unit at 0 Pa static

pressure difference between indoor and outdoor, either declared or measured

Note 1 to entry: If the supply and exhaust air volume flows are different, then the maximum air volume flow is

equal to the smaller of the two air volume flows.

[SOURCE: EN 13141-4:2021, 3.7, modified – Note 1 to entry has been replaced by “If the supply and

exhaust air volume flows are different, then the maximum air volume flow is equal to the smaller of the

two air volume flows.”]
3.10
declared minimum air volume flow
vmin,d

minimum air volume flow of the unit declared at 0 Pa static pressure difference between indoor and

outdoor

Note 1 to entry: If the supply and exhaust air volume flows are different, then the minimum air volume flow is

equal to the higher of the two air volume flows.

[SOURCE: EN 13141-7:2021, 3.8, modified – “at the reference pressure declared” has been replaced by

“at 0 Pa static pressure difference between indoor and outdoor”]
3.11
reference air volume flow
vref
air volume flow at 70 % of the maximum air volume flow

Note 1 to entry: If the air volume flow at 70 % of the maximum air volume flow cannot be adjusted on the product

itself, the closest value above is selected.

[SOURCE: EN 13141-4:2021, 3.8, modified – Note 1 to entry “To determine reference air volume flow, see

5.2.3.4, Table 6.” has been replaced by the one above]
3.12
unit static pressure

pressure increase induced by the ventilation unit given as difference between the static pressure at the

unit outlet and the total pressure at the unit inlet

Note 1 to entry: The parameter p for a ventilation unit is defined as the parameter p described in

us fs
EN ISO 5801 for a stand alone fan.
[SOURCE: EN 13141-4:2021, 3.2]
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SIST EN 13141-8:2022
EN 13141-8:2022 (E)
3.13
external static pressure difference
s,ext

pressure increase induced by the ventilation unit given as difference between the static pressures at the

unit outlet and the unit inlet

Note 1 to entry: The external static pressure difference, p , is used to determine the maximum air volume

s,ext
flow, the reference air volume flow and the minimum air volume flow.

[SOURCE: EN 13141-4:2021, 3.3, modified – “and the minimum air volume flow” has been added in Note 1

to entry]
3.14
air flow sensitivity

maximum relative deviation of the maximum air volume flow q due to a static pressure difference of

vmax
+20 Pa and – 20Pa

Note 1 to entry: Unbalanced (unequal) supply and exhaust air streams influence the thermal efficiency of the

ventilation unit and its air exchange capacity.

[SOURCE: EN 13141-4:2021, 3.12, modified – “of a non-ducted ventilation unit” has been removed from

the definition, Note 1 to entry has been added]
3.15
temperature ratio

temperature difference between inlet and outlet of one of the air flows divided by the temperature

difference between the inlets of both air flows
[SOURCE: EN 13141-7:2021, 3.15]
3.16
humidity ratio

difference of vapour mixing ratio between inlet and outlet of one of the air flows divided by the difference

of vapour mixing ratio between the inlets of both air flows
[SOURCE: EN 13141-7:2021, 3.16]
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SIST EN 13141-8:2022
EN 13141-8:2022 (E)
3.17
electrical power input

average overall electrical power input to the equipment within a defined interval of time for standard air

conditions obtained from:
— the power input of the fans;

— controller(s), compressor(s), safety devices of the equipment(s) excluding additional electrical

heating devices not used for defrosting

Note 1 to entry: Electrical power consumption includes the consumption of the heating device for defrosting

during the cold climate test.
[SOURCE: EN 13141-4:2021, 3.15, modified – Note 1 to entry has been added]
3.18
maximum electrical power input
E,max
electrical power input at maximum air volume flow, q
vmax

[SOURCE: EN 13141-4:2021, 3.17, modified – “, and its corresponding pressure, p ” has been

qvmax
removed]
3.19
electrical power input at the reference air volume flow
E,ref
electrical power input at reference air volume flow q
vref

[SOURCE: EN 13141-4:2021, 3.16, modified – “, and reference pressure, p ” has been removed]

ref
3.20
supply air transfer ratio

mass fraction of the discharged air to a zone from outdoor to exhaust that is actually recirculated air from

the same zone, due to internal leakage, external casing leakage and short circuiting

3.21
alternating ventilation unit

pair of mechanical ventilation devices using storage heat exchangers operating in opposite, synchronized

periodically changing air flow direction incorporated in common or two separate casing(s)

3.22
alternating mode

operating mode in which a ventilation unit periodically changes from exhausting air to supplying air and

vice versa
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SIST EN 13141-8:2022
EN 13141-8:2022 (E)
3.23
ventilation mode

constant operating mode where the alternating devices are running in an opposite direction with no heat

recovery
3.24
indoor side
supply and extract air side of the ventilation devices
3.25
cycle time

duration of a cycle in which each path of the alternating device performs one complete supply and exhaust

phase
4 Symbols and abbreviations

For the purposes of this document, the symbols and abbreviations given in EN 12792 and in Table 1

apply.
Table 1 — Symbols
Symbol Designation Unit
concentration of tracer gas ppm
absolute deviation of maximum air volume flow due to over —
v,over
pressure of 20 Pa
absolute deviation of maximum air volume flow due to under —
v,under
pressure of 20 Pa
d/λ thermal resistance K/W
airborne sound insulation in third octave bands dB
n,e
global airborne sound insulation index dB
n,e,w
quotient reduction factor —
red
sound
...

SLOVENSKI STANDARD
oSIST prEN 13141-8:2021
01-januar-2021
Prezračevanje stavb - Preskušanje lastnosti sestavnih delov/izdelkov za
prezračevanje stanovanjskih stavb - 8. del: Preskušanje lastnosti mehanskih
brezkanalnih dovodnih in odvodnih prezračevalnih enot (vključno z enotami za
vračanje toplote)

Ventilation for buildings - Performance testing of components/products for residential

ventilation - Part 8: Performance testing of non-ducted mechanical supply and exhaust

ventilation units (including heat recovery)

Lüftung von Gebäuden - Leistungsprüfung von Bauteilen/Produkten für die Lüftung von

Wohnungen - Teil 8: Leistungsprüfung von mechanischen Zuluft‐ und Ablufteinheiten

ohne Luftführung (einschließlich Wärmerückgewinnung)

Ventilation des bâtiments - Essais de performance des composants/produits pour la

ventilation des logements - Partie 8 : Essais de performance des unités de ventilation

double flux décentralisées (y compris la récupération de chaleur)
Ta slovenski standard je istoveten z: prEN 13141-8
ICS:
91.140.30 Prezračevalni in klimatski Ventilation and air-
sistemi conditioning systems
oSIST prEN 13141-8:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN 13141-8:2021
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oSIST prEN 13141-8:2021
DRAFT
EUROPEAN STANDARD
prEN 13141-8
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2021
ICS 91.140.30 Will supersede EN 13141-8:2014
English Version
Ventilation for buildings - Performance testing of
components/products for residential ventilation - Part 8:
Performance testing of non-ducted mechanical supply and
exhaust ventilation units (including heat recovery)

Ventilation des bâtiments - Essais de performance des Lüftung von Gebäuden - Leistungsprüfung von

composants/produits pour la ventilation des Bauteilen/Produkten für die Lüftung von Wohnungen -

logements - Partie 8 : Essais de performance des unités Teil 8: Leistungsprüfung von mechanischen Zuluft- und

de ventilation double flux décentralisées (y compris la Ablufteinheiten ohne Kanalanschluss (einschließlich

récupération de chaleur) Wärmerückgewinnung)

This draft European Standard is submitted to CEN members for second enquiry. It has been drawn up by the Technical

Committee CEN/TC 156.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.

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.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 13141-8:2021 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
oSIST prEN 13141-8:2021
prEN 13141-8:2021 (E)
Contents Page

European foreword ....................................................................................................................................................... 4

Introduction .................................................................................................................................................................... 5

1 Scope .................................................................................................................................................................... 7

2 Normative references .................................................................................................................................... 7

3 Terms and definitions ................................................................................................................................... 8

4 Symbols and abbreviations ...................................................................................................................... 12

5 Categories of heat exchangers ................................................................................................................. 16

6 Requirements ................................................................................................................................................ 16

7 Test methods ................................................................................................................................................. 18

7.1 General ............................................................................................................................................................. 18

7.2 Performance testing of aerodynamic characteristics ..................................................................... 18

7.2.1 Leakages, mixing and air transfer .......................................................................................................... 18

7.2.2 In/out airtightness ...................................................................................................................................... 21

7.2.3 Filter bypass ................................................................................................................................................... 21

7.2.4 Air flow ............................................................................................................................................................. 21

7.2.5 Electrical power input ................................................................................................................................ 24

7.3 Performance testing of thermal characteristics ............................................................................... 25

7.3.1 General ............................................................................................................................................................. 25

7.3.2 Test operating conditions ......................................................................................................................... 25

7.3.3 Temperature conditions ............................................................................................................................ 26

7.3.4 Test procedure .............................................................................................................................................. 27

7.3.5 Evaluation on supply air side (mandatory measurement) excluding alternating

ventilation units ........................................................................................................................................... 28

7.3.6 Evaluation on exhaust air side (optional measurement) excluding alternating

ventilation units ........................................................................................................................................... 29

7.4 Deviating aspects concerning alternating ventilation units ........................................................ 29

7.4.1 General ............................................................................................................................................................. 29

7.4.2 Internal leakage - Exhaust air transfer ratio ...................................................................................... 29

7.4.3 Determination of air volume flow .......................................................................................................... 30

7.4.4 Electrical power input ................................................................................................................................ 34

7.4.5 Performance testing of thermal characteristics ............................................................................... 34

8 Classification .................................................................................................................................................. 39

8.1 Leakage classification ................................................................................................................................. 39

8.2 Air flow sensitivity classification............................................................................................................ 40

8.3 Indoor/outdoor airtightness of the complete unit .......................................................................... 40

9 Performance testing of acoustic characteristics ............................................................................... 41

9.1 General ............................................................................................................................................................. 41

9.2 Radiative sound power in the indoor or outdoor space ................................................................ 41

9.2.1 General ............................................................................................................................................................. 41

9.2.2 Reverberant room method ....................................................................................................................... 41

9.2.3 Anechoic or semi-anechoic room method ........................................................................................... 42

9.2.4 Free field method ......................................................................................................................................... 42

9.3 Airborne sound insulation ........................................................................................................................ 43

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oSIST prEN 13141-8:2021
prEN 13141-8:2021 (E)

10 Test results ...................................................................................................................................................... 43

10.1 Test report ...................................................................................................................................................... 43

10.2 Product specifications................................................................................................................................. 44

10.3 Additional information related to the performance of the product .......................................... 44

10.4 Leakages ........................................................................................................................................................... 44

10.5 Air flow ............................................................................................................................................................. 45

10.6 Effective power input .................................................................................................................................. 45

10.7 Temperature and humidity ratios .......................................................................................................... 46

10.8 Acoustic characteristics ............................................................................................................................. 46

11 Cleaning and maintenance ........................................................................................................................ 47

Annex A (normative) Test layouts ......................................................................................................................... 48

Annex B (normative) Pressure leakage test method ...................................................................................... 51

B.1 External leakage test ................................................................................................................................... 51

B.2 Internal leakage test .................................................................................................................................... 52

Annex C (normative) Indoor mixing ..................................................................................................................... 53

C.1 General ............................................................................................................................................................. 53

C.2 Determination of indoor mixing - First test ........................................................................................ 53

C.3 Determination of indoor mixing - Second test ................................................................................... 53

C.4 Indoor mixing calculation ......................................................................................................................... 53

Bibliography ................................................................................................................................................................. 54

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oSIST prEN 13141-8:2021
prEN 13141-8:2021 (E)
European foreword

This document (prEN 13141-8:2021) has been prepared by Technical Committee CEN/TC 156

“Ventilation for buildings”, the secretariat of which is held by BSI.
This document is currently submitted to the second CEN Enquiry.
This document will supersede EN 13141-8:2014.

In addition to a number of editorial revisions, the following main changes have been made with respect

to EN 13141-8:2014:

— scope has been changed, and concerns now non-ducted units which ventilate more than one single

room;

— terms and definitions as well as symbols and abbreviations have been updated in accordance with

the parameters used in the document;
— new categories of heat exchanger have been added;
— designations in 7.2.1.4 and the Formulae (1) to (4) have been changed;

— reference of the internal and external leakage rates has been changes to the reference air volume

flow;
— extrapolation of the leakage rates has been added;
— 7.2.1.3.2 concerning exhaust air transfer ratio has been added;
— 7.2.4 concerning air flow measurement has been revised;

— requirements to convert the measured values to standard conditions have been added in 7.2.4 and

7.3.2;

— 7.3.3 has been divided into two separate subclauses 7.3.3.1 for standard tests and 7.3.3.2 for cold

climate tests;
— formulae to calculate the temperature ratios have been changed;
— wet bulb temperature for the cold climate test has been changed;

— the order of the specific test for alternating units including storage heat exchanges has been changed;

— deviating aspects for alternating units to determine the air flow correction, thermal performance and

the exhaust air transfer ratio have been revised;

— Table 10 concerning the temperature conditions for the cooling performance test has been moved in

prEN 13142.

A list of all parts in the EN 13141 series, published under the general title Ventilation for buildings —

Performance testing of components/products for residential ventilation can be found on the CEN website.

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oSIST prEN 13141-8:2021
prEN 13141-8:2021 (E)
Introduction

This document specifies methods for the performance testing of components used in residential

ventilation systems to establish the performance characteristics as identified in prEN 13142.

This document incorporates many references to other European and International Standards, especially

on characteristics other than the aerodynamic characteristics, for instance on acoustic characteristics.

In most cases some additional tests or some additional conditions are given for the specific use in

residential ventilation systems.
This document can be used for the following applications:
— laboratory testing;
— attestation purposes.

The position of this document in the field of standards for the mechanical building services is shown

in Figure 1.
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oSIST prEN 13141-8:2021
prEN 13141-8:2021 (E)

Figure 1 — Position of EN 13141-8 in the field of the mechanical building services

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oSIST prEN 13141-8:2021
prEN 13141-8:2021 (E)
1 Scope

This document specifies the laboratory test methods and test requirements for the testing of

aerodynamic, thermal, acoustic and the electrical performance characteristics of non-ducted mechanical

supply and exhaust residential ventilation units used in single dwellings.

The purpose of this document is not to consider the quality of ventilation but to test the performance of

the equipment.
In general, a ventilation unit contains:
— fans for mechanical supply and exhaust;
— air filters;
— air-to-air heat exchanger for heat and possibly humidity recovery;
— control system;
— inlet and outlet grilles.

Such equipment can be provided in more than one assembly, the separate assemblies of which are

designed to be used together.

Such equipment can contain alternating heat exchangers which provide separate supply and exhaust air

flows.

In certain cases, i.e. alternating ventilation unit, it may be declared that the equipment can be installed in

such a way that it serves more than one room. For the purpose of this document, these products are

assessed in a single room.

This document does not deal with ducted units which are covered by prEN 13141-7 or units with heat

pumps.
Safety requirements are given in EN 60335-2-40 and EN 60335-2-80.
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.

EN 12792:2003, Ventilation for buildings — Symbols, terminology and graphical symbols

EN ISO 717-1, Acoustics — Rating of sound insulation in buildings and of building elements — Part 1:

Airborne sound insulation (ISO 717-1)
EN ISO 5801, Fans — Performance testing using standardized airways (ISO 5801)

EN ISO 10140-1, Acoustics — Laboratory measurement of sound insulation of building elements — Part 1:

Application rules for specific products (ISO 10140-1)

EN ISO 10140-2, Acoustics — Laboratory measurement of sound insulation of building elements — Part 2:

Measurement of airborne sound insulation (ISO 10140-2)

EN ISO 10140-4, Acoustics — Laboratory measurement of sound insulation of building elements — Part 4:

Measurement procedures and requirements (ISO 10140-4)
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oSIST prEN 13141-8:2021
prEN 13141-8:2021 (E)

EN ISO 10140-5, Acoustics — Laboratory measurement of sound insulation of building elements — Part 5:

Requirements for test facilities and equipment (ISO 10140-5)

EN ISO 16890 (all parts), Air filters for general ventilation (ISO 16890 (all parts))

ISO 13347-2, Industrial fans — Determination of fan sound power levels under standardized laboratory

conditions — Part 2: Reverberant room method

ISO 13347-3, Industrial fans — Determination of fan sound power levels under standardized laboratory

conditions — Part 3: Enveloping surface methods

ISO 13347-4, Industrial fans — Determination of fan sound power levels under standardized laboratory

conditions — Part 4: Sound intensity method
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 12792:2003 and the following

apply.

ISO and IEC maintain terminological databases for the use in standardization at the following addresses:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
external leakage

leakage to or from the air flowing inside the casing of the ventilation unit to or from the surrounding air

[SOURCE: prEN 13141-4:2018, 3.11]
3.2
internal leakage
leakage inside the unit between the exhaust and the supply air flows
[SOURCE: prEN 13141-7:2018, 3.2]
3.3
filter bypass leakage
air bypass around filter cells
[SOURCE: prEN 13141-7:2018, 3.4]
3.4
indoor/outdoor airtightness
vio

maximum air volume flow at static pressure difference of – 20 Pa and + 20 Pa corresponding to the

setting when the fans are “OFF” and all additional shutters are closed
Note 1 to entry: Indoor/outdoor airtightness is not the external leakage.

[SOURCE: prEN 13141-4:2018, 3.13, modified – Removal of “through a non-ducted ventilation unit”]

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oSIST prEN 13141-8:2021
prEN 13141-8:2021 (E)
3.5
exhaust air transfer ratio

mass transfer of the discharged air to a zone (in Figure 2, a): from key 11 (extract) to key 22 (supply))

that is actually recirculated air from the same zone, due to internal leakage and external casing leakage

Note 1 to entry: The exhaust air transfer ratio, R , is used for units equipped witch category IIa heat exchanger.

3.6
outdoor mixing

mixing of the two air flows external to the equipment under test between discharge and intake ports at

outdoor terminal points caused by short circuiting
3.7
indoor mixing

mixing of the two air flows external to the equipment under test between discharge and intake ports at

indoor terminal points caused by short circuiting
3.8
declared maximum air volume flow
vmax,d

declared maximum air volume flow of the unit at 0 Pa static pressure difference, between indoor and

outdoor

[SOURCE: prEN 13141-4:2018, 3.6, modified – “at 0 Pa static pressure difference, between indoor and

outdoor” has been added]
3.9
maximum air volume flow
vmax

air volume flow corresponding to the maximum achievable fan curve setting of the unit at 0 Pa static

pressure difference between indoor and outdoor, either declared or measured

Note 1 to entry: If the supply and exhaust air volume flows are different, then the maximum air volume flow is

equal to the smaller of the two air volume flows.

[SOURCE: prEN 13141-4:2018, 3.7, modified – Note 1 to entry has been removed and Note 2 to entry

became Note 1 to entry, “at the pressure p ” has been replaced by “at 0 Pa static pressure difference

qvmax
between indoor and outdoor”]
3.10
declared minimum air volume flow
vmin,d

minimum air volume flow of the unit declared at 0 Pa static pressure difference between indoor and

outdoor

Note 1 to entry: If the supply and exhaust air volume flows are different, then the minimum air volume flow is

equal to the higher of the two air volume flows.
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oSIST prEN 13141-8:2021
prEN 13141-8:2021 (E)

[SOURCE: prEN 13141-7:2018, 3.8, modified – “at the reference pressure declared” has been replaced by

“at 0 Pa static pressure difference between indoor and outdoor”]
3.11
reference air volume flow
vref
air volume flow at 70 % of the maximum air volume flow

Note 1 to entry: If the air volume flow at 70 % of the maximum air volume flow cannot be adjusted on the product

itself, the closest value above is selected.

[SOURCE: prEN 13141-4:2018, 3.8, modified – Note 1 to entry "To determine reference air volume flow,

see 5.2.3.4, Table 6." has been replaced by the one above]
3.12
unit static pressure

pressure increase induced by the ventilation unit given as difference between the static pressure at the

unit outlet and the total pressure at the unit inlet

Note 1 to entry: The parameter p for a ventilation unit is defined as the parameter p described in

us fs
EN ISO 5801 for a stand alone fan.
[SOURCE: prEN 13141-4:2018, 3.2]
3.13
external static pressure difference
s,ext

pressure increase induced by the ventilation unit given as difference between the static pressures at the

unit outlet and the unit inlet

Note 1 to entry: The external static pressure difference is used to determine the maximum air volume flow, the

reference air volume flow and the minimum air volume flow.

[SOURCE: prEN 13141-4:2018, 3.2, modified – “and the minimum air volume flow” has been added in

Note 1 to entry]
3.14
air flow sensitivity

maximum relative deviation of the maximum air volume flow q due to a static pressure difference of

vmax
+ 20 Pa and – 20 Pa

Note 1 to entry: Unbalanced (unequal) supply and exhaust air streams influence the thermal efficiency of the

ventilation unit and its air exchange capacity.

[SOURCE: prEN 13141-4:2018, 3.2, modified – “of a non-ducted ventilation unit” has been removed from

the definition, Note 1 to entry has been added]
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oSIST prEN 13141-8:2021
prEN 13141-8:2021 (E)
3.15
temperature ratio

temperature difference between inlet and outlet of one of the air flows divided by the temperature

difference between the inlets of both air flows
[SOURCE: prEN 13141-7:2018, 3.15]
3.16
humidity ratio

difference of vapour mixing ratio between inlet and outlet of one of the air flows divided by the difference

of vapour mixing ratio between the inlets of both air flows
[SOURCE: prEN 13141-7:2018, 3.16]
3.17
electrical power input

average overall electrical power input to the equipment within a defined interval of time for standard air

conditions obtained from:
— the power input of the fans;

— controller(s), compressor(s), safety devices of the equipment(s) excluding additional electrical

heating devices not used for defrosting

Note 1 to entry: Electrical power consumption includes the consumption of the heating device for defrosting

during the cold climate test.
[SOURCE: prEN 13141-4:2018, 3.15, modified – Note 1 to entry has been added]
3.18
maximum electrical power input
E,max
electrical power input at maximum air volume flow, q
vmax

[SOURCE: prEN 13141-4:2018, 3.17, modified – “, and its corresponding pressure, p ” has been

qvmax
removed]
3.19
electrical power input at the reference air volume flow
E,ref
electrical power input at reference air volume flow q
vref

[SOURCE: prEN 13141-4:2018, 3.16, modified – “, and reference pressure, p ” has been removed]

ref
---------------------- Page: 13 ----------------------
oSIST prEN 13141-8:2021
prEN 13141-8:2021 (E)
3.20
exhaust air transfer ratio
s 1;2
( )

mass fraction of the discharged air to a zone (see Figure 2: from key 11 (extract) to key 22 (supply)) that

is actually recirculated air from the same zone, due to internal leakage, external casing leakage, short

circuiting and carry back

Note 1 to entry: The exhaust air transfer ratio, R , is used for units equipped witch category IIb heat

s 1;2
( )
exchanger according to Table 2.
3.21
supply air transfer ratio

mass fraction of the discharged air to a zone (see Figure 2: from key 21 (outdoor) to key 12 (exhaust))

that is actually recirculated air from the same zone, due to internal leakage, external casing leakage and

short circuiting
3.22
alternating ventilation unit

pair of mechanical ventilation devices using storage heat exchangers operating in opposite, synchronized

periodically changing air flow direction incorporated in common or two separate casing(s)

3.23
alternating mode

operating mode in which a ventilation unit periodically changes from exhausting air to supplying air and

vice versa
3.24
ventilation mode

constant operating mode where the alternating devices are running in an opposite direction with no heat

recovery
3.25
indoor side
supply and extract air side of the ventilation devices
3.26
air path
path of a ventilation device with equal flow direction and amount
3.27
cycle time

duration of a cycle in which the alternating device changes its direction and return back to the original

direction
4 Symbols and abbreviations

For the purposes of this document, the symbols and abbreviations given in EN 12792 and in Table 1

apply.
---------------------- Page: 14 ----------------------
oSIST prEN 13141-8:2021
prEN 13141-8:2021 (E)
Table 1 — Symbols
Symbol Designation Unit
concentration of tracer gas ppm
absolute deviation of maximum air volume flow due to over —
v,over
pressure of 20 Pa
absolute deviation of maximum air volume flow due to under —
v,under
pressure of 20 Pa
thermal resistance K/W
d /
airborne sound insulation in third octave bands dB
n,e
global airborne sound insulation index dB
n,e,w
quotient reduction factor —
red
sound power level in third octave band dB
A-weighted sound power level dB
fan speed -1
min
fan speed in ventilation mode -1
min
vent
electrical power input W
electrical power input at the reference air volume flow W
E,ref
maximum electrical power inp
...

SLOVENSKI STANDARD
oSIST prEN 13141-8:2018
01-oktober-2018
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Ventilation des bâtiments - Essais de performance des composants/produits pour la

ventilation des logements - Partie 8 : Essais de performance des unités de ventilation

double flux décentralisées (y compris la récupération de chaleur)
Ta slovenski standard je istoveten z: prEN 13141-8
ICS:
91.140.30 3UH]UDþHYDOQLLQNOLPDWVNL Ventilation and air-
VLVWHPL conditioning systems
oSIST prEN 13141-8:2018 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN 13141-8:2018
---------------------- Page: 2 ----------------------
oSIST prEN 13141-8:2018
DRAFT
EUROPEAN STANDARD
prEN 13141-8
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2018
ICS 91.140.30 Will supersede EN 13141-8:2014
English Version
Ventilation for buildings - Performance testing of
components/products for residential ventilation - Part 8:
Performance testing of non-ducted mechanical supply and
exhaust ventilation units (including heat recovery)

Ventilation des bâtiments - Essais de performance des Lüftung von Gebäuden - Leistungsprüfung von

composants/produits pour la ventilation des Bauteilen/Produkten für die Lüftung von Wohnungen -

logements - Partie 8 : Essais de performance des unités Teil 8: Leistungsprüfung von mechanischen Zuluft- und

de ventilation double flux décentralisées (y compris la Ablufteinheiten ohne Luftführung (einschließlich

récupération de chaleur) Wärmerückgewinnung)

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

CEN/TC 156.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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.

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.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 13141-8:2018 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
oSIST prEN 13141-8:2018
prEN 13141-8:2018 (E)
Contents Page

European foreword ....................................................................................................................................................... 4

Introduction .................................................................................................................................................................... 5

1 Scope .................................................................................................................................................................... 6

2 Normative references .................................................................................................................................... 6

3 Terms and definitions ................................................................................................................................... 7

4 Symbols and abbreviations ...................................................................................................................... 10

5 Categories of heat exchangers ................................................................................................................. 11

6 Requirements ................................................................................................................................................ 12

7 Test methods ................................................................................................................................................. 13

7.1 General ............................................................................................................................................................. 13

7.2 Performance testing of aerodynamic characteristics ..................................................................... 14

7.2.1 Leakages, mixing and air transfer .......................................................................................................... 14

7.2.2 Air flow ............................................................................................................................................................. 16

7.2.3 Electrical power input ................................................................................................................................ 18

7.2.4 In/out airtightness ...................................................................................................................................... 19

7.2.5 Filter bypass ................................................................................................................................................... 19

7.3 Performance testing of thermal characteristics ............................................................................... 19

7.3.1 General ............................................................................................................................................................. 19

7.3.2 Test operating conditions ......................................................................................................................... 19

7.3.3 Temperature conditions ............................................................................................................................ 20

7.3.4 Test procedure .............................................................................................................................................. 21

7.3.5 Evaluation on supply air side (mandatory measurement) excluding alternating

ventilation units ........................................................................................................................................... 22

7.3.6 Evaluation on exhaust air side (optional measurement) excluding alternating

ventilation units ........................................................................................................................................... 22

7.4 Deviating aspects concerning alternating ventilation units using a storage type heat

exchangers ...................................................................................................................................................... 22

7.4.1 General ............................................................................................................................................................. 22

7.4.2 Air flow correction ....................................................................................................................................... 23

7.4.3 Exhaust air transfer ratio .......................................................................................................................... 24

7.4.4 Performance testing of thermal characteristics ............................................................................... 25

8 Classification .................................................................................................................................................. 27

8.1 Leakage classification ................................................................................................................................. 27

8.2 Air flow sensitivity classification............................................................................................................ 27

8.3 Indoor/outdoor airtightness of the complete unit .......................................................................... 28

9 Performance testing of acoustic characteristics ............................................................................... 28

9.1 General ............................................................................................................................................................. 28

9.2 Radiative sound power in the indoor or outdoor space ................................................................ 28

9.2.1 General ............................................................................................................................................................. 28

9.2.2 Reverberant room method ....................................................................................................................... 29

9.2.3 Anechoic or semi-anechoic room method ........................................................................................... 29

9.2.4 Free field method ......................................................................................................................................... 29

9.3 Airborne sound insulation ........................................................................................................................ 30

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10 Test results ...................................................................................................................................................... 31

10.1 Test report ...................................................................................................................................................... 31

10.2 Product specifications................................................................................................................................. 31

10.3 Additional information related to the performance of the product .......................................... 32

10.4 Leakages ........................................................................................................................................................... 32

10.5 Air flow ............................................................................................................................................................. 32

10.6 Effective power input .................................................................................................................................. 33

10.7 Temperature and humidity ratios .......................................................................................................... 33

10.8 Acoustic characteristics ............................................................................................................................. 33

11 Cleaning and maintenance ........................................................................................................................ 34

Annex A (informative) Test layouts .................................................................................................................... 35

Annex B (normative) Pressure leakage test method .................................................................................... 37

B.1 External leakage test ................................................................................................................................... 37

B.2 Internal leakage test .................................................................................................................................... 38

Annex C (normative) Indoor mixing ................................................................................................................... 39

C.1 General ............................................................................................................................................................. 39

C.2 Determination of indoor mixing - First test ........................................................................................ 39

C.3 Determination of indoor mixing - Second test ................................................................................... 39

C.4 Indoor mixing calculation ......................................................................................................................... 39

Bibliography ................................................................................................................................................................. 40

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European foreword

This document (prEN 13141-8:2018) has been prepared by Technical Committee CEN/TC 156

“Ventilation for buildings”, the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 13141-8:2014.

In addition to a number of editorial revisions, the following main changes have been made with respect

to EN 13141-8:2014:

— scope has been changed, and concerns now non-ducted units which ventilate more than one single

room;

— terms and definitions as well as symbols and abbreviations have been updated in accordance with

the parameters used in the document;
— new categories of heat exchanger have been added;
— designations in 7.2.1.2 have been changed;
— Table 2 has been moved to prEN 13142;

— reference of the internal and external leakage rates has been changes to the reference air volume

flow;
— extrapolation of the leakage rates has been added;
— 7.2.1.5 concerning exhaust air transfer ratio has been added;
— 7.2.2 concerning air flow measurement has been revised;
— formulas to calculate the temperature ratios have been changed;
— wet bulb temperature for the cold climate test has been changed;

— the order of the specific test for alternating units including storage heat exchanges has been

changed;

— requirements to determine the thermal performance and the exhaust air transfer ration have been

revised;

— the two tables concerning the leakages, mixing and flow balance variations calculations have been

moved to prEN 13142.

A list of all parts in the EN 13141 series, published under the general title Ventilation for buildings —

Performance testing of components/products for residential ventilation can be found on the CEN website.

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Introduction

This document specifies methods for the performance testing of components used in residential

ventilation systems to establish the performance characteristics as identified in prEN 13142.

This document incorporates many references to other European and International Standards, especially

on characteristics other than the aerodynamic characteristics, for instance on acoustic characteristics.

In most cases some additional tests or some additional conditions are given for the specific use in

residential ventilation systems.
This document can be used for the following applications:
— laboratory testing;
— attestation purposes.

The position of this document in the field of standards for the mechanical building services is shown

in Figure 1.

Figure 1 — Position of EN 13141-8 in the field of the mechanical building services

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1 Scope

This document specifies the laboratory test methods and test requirements for the testing of

aerodynamic, thermal, acoustic and the electrical performance characteristics of non-ducted mechanical

supply and exhaust ventilation units used in single dwellings.

The purpose of this document is not to consider the quality of ventilation but to test the performance of

the equipment.
In general, a ventilation unit contains:
— fans for mechanical supply and exhaust;
— air filters;
— air-to-air heat exchanger for heat and possibly humidity recovery;
— control system;
— inlet and outlet grilles.

Such equipment can be provided in more than one assembly, the separate assemblies of which are

designed to be used together.

Such equipment can contain alternating heat exchangers which provide separate supply and exhaust air

flows.

In certain cases, i.e. alternating ventilation unit, the manufacturer may declare that the equipment can

be installed in such a way that it serves more than one room. For the purpose of this document, these

products are assessed in a single room.
This document does not deal with ducted units or units with heat pumps.
Safety requirements are given in EN 60335-2-40 and EN 60335-2-80.
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.

EN 306, Heat exchangers - Methods of measuring the parameters necessary for establishing the

performance

EN 12792:2003, Ventilation for buildings - Symbols, terminology and graphical symbols

EN ISO 717-1, Acoustics - Rating of sound insulation in buildings and of building elements - Part 1:

Airborne sound insulation (ISO 717-1)

EN ISO 5801:2017, Fans - Performance testing using standardized airways (ISO 5801:2017)

EN ISO 10140-1, Acoustics - Laboratory measurement of sound insulation of building elements - Part 1:

Application rules for specific products (ISO 10140-1)

EN ISO 10140-2, Acoustics - Laboratory measurement of sound insulation of building elements - Part 2:

Measurement of airborne sound insulation (ISO 10140-2)
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EN ISO 10140-5, Acoustics - Laboratory measurement of sound insulation of building elements - Part 5:

Requirements for test facilities and equipment (ISO 10140-5)

EN ISO 16890 (all parts), Air filters for general ventilation (ISO 16890 (all parts))

ISO 13347-2, Industrial fans - Determination of fan sound power levels under standardized laboratory

conditions - Part 2: Reverberant room method

ISO 13347-3, Industrial fans - Determination of fan sound power levels under standardized laboratory

conditions - Part 3: Enveloping surface methods

ISO 13347-4, Industrial fans - Determination of fan sound power levels under standardized laboratory

conditions - Part 4: Sound intensity method
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 12792:2003,

EN ISO 5801:2017 and the following apply.

ISO and IEC maintain terminological databases for the use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO online browsing platform: available at http://www.iso.org/obp
3.1
external leakage

leakage to or from the air flowing inside the casing of the unit to or from the surrounding air

3.2
internal leakage
leakage inside the unit between the exhaust and the supply air flows
3.3
filter bypass leakage
air bypass around filter cells
3.4
indoor/outdoor airtightness
vio

maximum air volume flow at static pressure difference of – 20 Pa and + 20 Pa corresponding to the

setting when the fans are off and all additional shutters are closed
3.5
exhaust air transfer ratio

mass transfer of the discharged air to a zone (in Figure 2, a): from key 11 (extract) to key 22 (supply))

that is actually recirculated air from the same zone, due to internal leakage and external casing leakage

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3.6
outdoor mixing

mixing of the two air flows external to the equipment under test between discharge and intake ports at

outdoor terminal points caused by short circuiting
3.7
indoor mixing

mixing of the two air flows external to the equipment under test between discharge and intake ports at

indoor terminal points caused by short circuiting
3.8
declared maximum air volume flow
vmax,d

maximum air volume flow of the unit declared by the manufacturer at 0 Pa static pressure difference,

between indoor and outdoor
3.9
maximum air volume flow
vmax

air volume flow corresponding to the maximum achievable fan setting of the unit at 0 Pa static pressure

difference, between indoor and outdoor

Note 1 to entry: If the supply and exhaust air volume flows are different, then the maximum air volume flow is

equal to the smaller of the two air volume flows.
3.10
reference air volume flow
vref
air volume flow at 70 % of the maximum air volume flow

Note 1 to entry: If the air volume flow at 70 % of the maximum air volume flow cannot be adjusted on the

product itself, the closest value above is selected.
3.11
static fan pressure

pressure increase induced by the ventilation unit given as difference between the static pressure at the

unit outlet and the total pressure at the unit inlet
[SOURCE: EN ISO 5801:2008, 3.40]
3.12
static pressure difference
s,ext

pressure increase induced by the ventilation unit given as difference between the static pressures at the

unit outlet and the unit inlet

Note 1 to entry: Static pressure difference is used to determine the maximum air volume flow, the reference air

volume flow and the minimum air volume flow.
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3.13
air flow sensitivity

maximum relative deviation of the maximum air volume flow q due to a static pressure difference of

vmax
+ 20 Pa and – 20 Pa

Note 1 to entry: Unbalanced (unequal) supply and exhaust air streams influence the thermal efficiency of the

ventilation unit and its air exchange capacity.
3.14
temperature ratio

temperature difference between inlet and outlet of one of the air flows divided by the temperature

difference between the inlets of both air flows
3.15
humidity ratio

difference of water content between inlet and outlet of one of the air flows divided by the difference of

water content between the inlets of both air flows
3.16
electrical power input

average over all electrical power input to the equipment within a defined interval of time for standard

air conditions obtained from the power input of the fans; controller(s), compressor(s), safety devices of

the equipment(s) excluding additional electrical heating devices not used for defrosting

Note 1 to entry: P is expressed in watts.
3.17
maximum electrical power input
E,max
electrical power input at maximum air volume flow q
vmax
3.18
electrical power input at the reference volume flow
E,ref
electrical power input at reference air volume flow q
vref
3.19
exhaust air transfer ratio
s(1;2)

mass fraction of the discharged air to a zone (see Figure 2: from key 11 (extract) to key 22 (supply))

that is actually recirculated air from the same zone, due to internal leakage, external casing leakage and

short circuiting
3.20
supply air transfer ratio

mass fraction of the discharged air to a zone (see Figure 2: from key 21 (outdoor) to key 12 (exhaust))

that is actually recirculated air from the same zone, due to internal leakage, external casing leakage and

short circuiting
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3.21
alternating ventilation unit

pair of mechanical ventilation devices using storage heat exchangers operating in opposite, periodically

changing air flow direction incorporated in common or two separate casing(s)
3.22
ventilation mode

constant operating mode where the alternating devices are running in a opposite direction with no heat

recovery
4 Symbols and abbreviations

For the purposes of this document, the symbols and abbreviations given in EN 12792 and in Table 1

apply.
Table 1 — Symbols
Symbol Designation Unit
c concentration of tracer gas ppm
D airborne sound insulation in third octave bands dB
n,e
D global airborne sound insulation index dB
n,e,w
L sound power level dB
L A-weighted sound power level dB
P electrical power input W
P electrical power input at the reference volume W
E,ref
P maximum electrical power input W
E,max
p fan static pressure Pa
p pressure at maximum air volume flow Pa
qvmax
p reference pressure Pa
ref
p static pressure difference Pa
s,ext
-1 -1 -1
q mass air flow rate kg.s or kg h or g.s
3 -1 3 -1 -1
q air volume flow m .s or m h or l.s
3 -1 3 -1 -1
qvmax maximum air volume flow m .s or m h or l.s
3 -1 3 -1 -1
q declared maximum air volume flow m .s or m h or l.s
vmax,d
3 -1 3 -1 -1
q maximum air volume flow at 0 pressure m .s or m h or l.s
vmax,0
3 -1 3 -1 -1
q air volume flow at 0 pressure m .s or m h or l.s
3 -1 3 -1 -1
q indoor/outdoor airtightness m .s or m h or l.s
vio
3 -1 3 -1 -1
q internal leakage from exhaust to supply flow m .s or m h or l.s
vies
3 -1 3 -1 -1
q internal leakage from supply to exhaust flow m .s or m h or l.s
vise
3 -1 3 -1 -1
q reference air volume flow m .s or m h or l.s
vref
3 -1 3 -1 -1
q declared maximum air volume flow rate m .s or m h or l.s
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Symbol Designation Unit
3 -1 3 -1 -1
q external leakage air volume flow rate m .s or m h or l.s
3 -1 3 -1 -1
q internal leakage air volume flow rate m .s or m h or l.s
R transfer ratio %
R supply air transfer ratio %
t “on” period of the cycle with alternating ventilation units s
working in one way
t “off” period of the cycle for alternating ventilation units s
t “on” period of the cycle with alternating ventilation units s
working in the other way
t “off” period of the cycle for alternating ventilation units s
t time of an operating cycle for alternating ventilation units s
cycle
v air flow velocity m.s
ν air flow sensitivity %
V volume of the casing l
V air volume content of device l
θ air temperature °C
θ wet bulb temperature °C
x water content kg water/kg dry air
21 outdoor air (ODA) (see Figure 2) —
22 supply air (SUP)(see Figure 2) —
11 extract air (ETA) (see Figure 2) —
12 exhaust air (EHA)(see Figure 2) —
η temperature ratio of the unit on exhaust air side —
θ,ex
η temperature ratio of the unit on supply air side —
θ,su
η humidity ratio of the unit on exhaust air side —
x,ex
η humidity ratio of the unit on supply air side —
x,su
ρ density of the air kg/m
5 Categories of heat exchangers
Categories of heat exchangers are given in Table 2.
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Table 2 — Categories of heat exchangers
Category Definition
I Recuperative heat exchangers (e.g. air-to-air plate or tube heat exchanger)

Ia Recuperative heat exchangers of the category Ia are designed to transfer sensible

thermal energy from one air stream to another without moving parts. Heat transfer

surfaces are in form of plates or tubes. This heat exchanger can have parallel flow,

cross flow or counter flow construction or a combination of these.

Ib Recuperative heat exchangers of the category Ib are designed to transfer total

thermal energy including vapour diffusion from one air stream to another without
moving parts. Heat transfer surfaces are in form of plates or tubes. This heat
exchanger can have parallel flow, cross flow or counter flow construction or a
combination of these.
II Regenerative heat exchangers
IIa Regenerative heat exchangers with moving masses e.g. rotary
IIb Regenerative heat exchangers with stationary masses and changing of flow
direction
6 Requirements

In addition, to assess correctly the thermal performance, aerodynamic characteristics, including all

leakages, shall be tested before or together with any thermal characteristics testing (see 7.3).

Aerodynamic characteristics (see 7.2) shall include three characteristics listed below:

— external leakage;
— internal leakage or exhaust air transfer ratio;
— air flow.
Other characteristics such as filter bypass leakage are optional.
The tests for thermal performances shall
...

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