kSIST FprEN 13141-7:2020

Ventilation for buildings - Performance testing of components/products for residential ventilation - Part 7: Performance testing of 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 electrical performance characteristics of ducted mechanical supply and exhaust ventilation units intended for single family houses.
This document is applicable to unit that contain at least, within one or more casing:
-   fans for mechanical supply and exhaust;
-   air filters;
-   air-to-air heat exchanger and/or air-to-air heat pump for air heat recovery;
-   control system.
Such unit can be provided in more than one assembly, the separate assemblies of which are designed to be used together.
The different possible arrangements of heat recovery, heat exchangers and/or heat pumps are described in Annex A.
This document does not deal with non-ducted units.
This document does not cover ventilation systems that may also provide water space heating and hot water.
This document does not cover units including combustion engine, driven compression heat pumps and absorption heat pumps.
Electrical safety requirements are given in EN 60335 2 40 and EN 60335 2 80.

Lüftung von Gebäuden - Leistungsprüfungen von Bauteilen/Produkten für die Lüftung von Wohnungen - Teil 7: Leistungsprüfung von mechanischen Zuluft‐ und Ablufteinheiten (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 fest.
ANMERKUNG Derartige Geräte werden in FprEN 13142:2020 als bidirektionale Lüftungsgeräte bezeichnet.
Dieses Dokument ist auf Geräte anwendbar, die in einem oder mehreren Gehäuse(n) mindestens Folgendes umfassen:
- Ventilatoren für mechanische Zuluft- und Fortlufteinheiten;
- Luftfilter;
- Luft-Luft-Wärmeübertrager und/oder Luft/Luft-Wärmepumpen für die Wärmerückgewinnung;
- Steuer und Regeleinrichtungen.
Eine derartige Einrichtung kann in mehr als einer Baugruppe geliefert werden, wobei die einzelnen Baugruppen dafür ausgelegt sind, zusammen verwendet zu werden.
Beispiele für die verschiedenen möglichen Anordnungen der Wärmeübertrager und/oder Wärmepumpen für die Wärmerückgewinnung sind in Anhang A beschrieben.
Dieses Dokument deckt Lüftungsgeräte mit kontinuierlichen Masseströmen für jeden Einstellpunkt ab.
Dieses Dokument behandelt keine Geräte, die nicht an Luftleitungen angeschlossen sind; diese werden in prEN 13141 8:2020 behandelt.
Dieses Dokument behandelt keine Lüftungsanlagen, die auch für die Warmwasser-Raumheizung und die Warmwasserbereitung eingesetzt werden dürfen; diese werden in EN 16573 behandelt.
Dieses Dokument behandelt keine Geräte, die Kompressionswärmepumpen mit Antrieb durch Verbrennungsmotor und Absorptionswärmepumpen umfassen.
Die Anforderungen an die elektrische Sicherheit sind in EN 60335 2 40 und EN 60335 2 80 angegeben.

Ventilation des bâtiments - Essais de performance des composants/produits pour la ventilation des logements - Partie 7 : Essais de performance des centrales double flux (y compris la récupération de chaleur)

LLe 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 centrales double flux pour les logements.
NOTE   Ces centrales sont appelées centrales de ventilation bidirectionnelles dans l’EN 13142:2021.
Le présent document est applicable aux centrales contenant au moins, dans une ou plusieurs enveloppes :
-   des ventilateurs pour l’alimentation et l'extraction mécaniques ;
-   des filtres à air ;
-   un échangeur de chaleur air-air et/ou une pompe à chaleur air-air pour la récupération de chaleur de l’air ;
-   un système de régulation.
Une telle centrale peut être fournie en plusieurs assemblages, ces assemblages individuels étant conçus pour être utilisés conjointement.
Des exemples de différentes configurations possibles de la récupération de chaleur, des échangeurs de chaleur et/ou des pompes à chaleur sont décrits à l’Annexe A.
Le présent document couvre les centrales de ventilation à débit massique continu pour chaque point de réglage.
Le présent document ne traite pas des unités décentralisées qui sont traitées dans le prEN 13141-8:2021.
Le présent document ne couvre pas les systèmes de ventilation qui peuvent également fournir de l'eau de chauffage et de l’eau chaude qui sont traités dans l'EN 16573.
Le présent document ne couvre pas les centrales comprenant des pompes à chaleur à compression entraînées par un moteur à combustion et des pompes à chaleur à absorption.
Les exigences de sécurité électrique 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 - 7. del: Preskušanje lastnosti mehanskih kanalnih dovodnih in odvodnih prezračevalnih enot (vključno z enotami za vračanje toplote)

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN 13141-7:2018
01-oktober-2018
3UH]UDþHYDQMHVWDYE3UHVNXãDQMHODVWQRVWLVHVWDYQLKGHORYL]GHONRY]D
SUH]UDþHYDQMHVWDQRYDQMVNLKVWDYEGHO3UHVNXãDQMHODVWQRVWLPHKDQVNLK
NDQDOQLKGRYRGQLKLQRGYRGQLKHQRWYNOMXþQR]HQRWDPL]DYUDþDQMHWRSORWH

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

ventilation - Part 7: Performance testing of ducted mechanical supply and exhaust

ventilation units (including heat recovery)

/IWXQJYRQ*HElXGHQ/HLVWXQJVSUIXQJHQYRQ%DXWHLOHQ3URGXNWHQIUGLH/IWXQJ

YRQ:RKQXQJHQ7HLO/HLVWXQJVSUIXQJYRQPHFKDQLVFKHQ=XOXIW"XQG
$EOXIWHLQKHLWHQHLQVFKOLH‰OLFK:lUPHUFNJHZLQQXQJ

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

ventilation des logements - Partie 7 : Essais de performance des centrales double flux (y

compris la récupération de chaleur)
Ta slovenski standard je istoveten z: prEN 13141-7
ICS:
91.140.30 3UH]UDþHYDOQLLQNOLPDWVNL Ventilation and air-
VLVWHPL conditioning systems
oSIST prEN 13141-7:2018 en,fr,de

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

---------------------- Page: 1 ----------------------
oSIST prEN 13141-7:2018
---------------------- Page: 2 ----------------------
oSIST prEN 13141-7:2018
DRAFT
EUROPEAN STANDARD
prEN 13141-7
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2018
ICS 91.140.30 Will supersede EN 13141-7:2010
English Version
Ventilation for buildings - Performance testing of
components/products for residential ventilation - Part 7:
Performance testing of 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 7 : Essais de performance des Teil 7: Leistungsprüfung von mechanischen Zuluft- und

centrales double flux (y compris la récupération de Ablufteinheiten (einschließlich Wärmerückgewinnung)

chaleur)

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 13141-7:2018 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
oSIST prEN 13141-7:2018
prEN 13141-7:2018 (E)
Contents Page

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

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

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

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

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

4 Symbols and abbreviations ...................................................................................................................... 11

5 Categories of heat exchangers ................................................................................................................. 12

6 Requirements ................................................................................................................................................ 13

7 Test methods ................................................................................................................................................. 14

7.1 General ............................................................................................................................................................. 14

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

7.2.1 Leakages .......................................................................................................................................................... 14

7.2.2 Air flow/pressure curve ............................................................................................................................ 16

7.2.3 Electrical power input ................................................................................................................................ 20

7.2.4 Filter bypass ................................................................................................................................................... 20

7.3 Performance testing of thermal characteristics ............................................................................... 21

7.3.1 General ............................................................................................................................................................. 21

7.3.2 Test operating conditions ......................................................................................................................... 21

7.3.3 Temperature conditions ............................................................................................................................ 21

7.3.4 Test procedure .............................................................................................................................................. 22

7.3.5 Evaluation on supply air side (mandatory measurement) ........................................................... 23

7.3.6 Evaluation on exhaust air side (optional measurement) .............................................................. 24

7.3.7 Heat pump performance ........................................................................................................................... 24

7.3.8 Combined heat pump and air-to-air heat exchanger performance ........................................... 25

7.4 Performance testing of acoustic characteristics ............................................................................... 25

7.4.1 Noise radiated through the casing of the unit .................................................................................... 25

7.4.2 Sound power level in duct connections of the unit .......................................................................... 26

8 Test results ..................................................................................................................................................... 28

8.1 Test report ...................................................................................................................................................... 28

8.2 Product specifications ................................................................................................................................ 29

8.3 Leakages .......................................................................................................................................................... 29

8.4 Air flow/pressure curve ............................................................................................................................ 30

8.5 Heat pump exhaust air/outdoor air performances ......................................................................... 30

8.6 Temperature ratios ..................................................................................................................................... 30

8.7 Acoustic characteristics ............................................................................................................................. 31

8.8 Electrical power input ................................................................................................................................ 31

Annex A (informative) Example of some possible arrangements of heat recovery heat

exchanger and/or heat pumps for category I .................................................................................... 32

Annex B (normative) Pressure leakage test method .................................................................................... 34

B.1 External leakage ........................................................................................................................................... 34

B.2 Internal leakage test ................................................................................................................................... 34

---------------------- Page: 4 ----------------------
oSIST prEN 13141-7:2018
prEN 13141-7:2018 (E)

Annex C (normative) Tracer gas test method .................................................................................................. 36

C.1 General method for rating purposes ..................................................................................................... 36

C.2 Augmented method for measuring instantaneous recirculation of ducted units

under different operating conditions (optional) .............................................................................. 37

C.3 Testing orders for tracer gas tests .......................................................................................................... 38

Annex D (normative) Examples for the evaluation of maximum air volume flow and

pressure ........................................................................................................................................................... 42

Annex E (normative) Examples for the evaluation of reference pressure ............................................ 43

Annex F (normative) Connection boxes ............................................................................................................. 44

Bibliography ................................................................................................................................................................. 46

---------------------- Page: 5 ----------------------
oSIST prEN 13141-7:2018
prEN 13141-7:2018 (E)
European foreword

This document (prEN 13141-7:2018) 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 13141-7:2010.

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

to EN 13141-7:2010:

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

with the parameters used in the document;
— new categories of heat exchanger have been added;

— general requirements of the static pressure distribution have been added in 7.1;

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

volume flow;

— requirements to convert the measured values to standard conditions have been added in 7.2.2.1;

— determination of the static pressure difference, maximum air flow and reference air flow has been

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

— Annex D, giving examples for the evaluation of maximum air volume flow and pressure, has been

added;

— Annex E giving examples for the evaluation of reference pressure has been added;

— the description of the connection box has been moved to Annex F.

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.

---------------------- Page: 6 ----------------------
oSIST prEN 13141-7:2018
prEN 13141-7:2018 (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 does not contain any information on ductwork and fittings, which are covered by other

European Standards.
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.
---------------------- Page: 7 ----------------------
oSIST prEN 13141-7:2018
prEN 13141-7:2018 (E)

Figure 1 — Position of EN 13141-7 in the field of the mechanical building services

---------------------- Page: 8 ----------------------
oSIST prEN 13141-7:2018
prEN 13141-7:2018 (E)
1 Scope

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

aerodynamic, thermal, acoustic and electrical performance characteristics of ducted mechanical supply

and exhaust ventilation units intended for single family houses.

This document is applicable to unit that contain at least, within one or more casing:

— fans for mechanical supply and exhaust;
— air filters;
— air-to-air heat exchanger and/or air-to-air heat pump for air heat recovery;
— control system.

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

be used together.

The different possible arrangements of heat recovery, heat exchangers and/or heat pumps are

described in Annex A.
This document does not deal with non-ducted units.

This document does not cover ventilation systems that may also provide water space heating and hot

water.

This document does not cover units including combustion engine, driven compression heat pumps and

absorption heat pumps.
Electrical 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, Ventilation for buildings - Symbols, terminology and graphical symbols

EN 14511 (all parts), Air conditioners, liquid chilling packages and heat pumps with electrically driven

compressors for space heating and cooling

EN 14511-3, Air conditioners, liquid chilling packages and heat pumps for space heating and cooling and

process chillers, with electrically driven compressors - Part 3: Test methods

EN 14511-4, Air conditioners, liquid chilling packages and heat pumps for space heating and cooling and

process chillers, with electrically driven compressors - Part 4: Requirements

EN ISO 3741, Acoustics - Determination of sound power levels and sound energy levels of noise sources

using sound pressure - Precision methods for reverberation test rooms (ISO 3741)

EN ISO 3743-1, Acoustics - Determination of sound power levels and sound energy levels of noise sources

using sound pressure - Engineering methods for small movable sources in reverberant fields - Part 1:

Comparison method for a hard-walled test room (ISO 3743-1)
---------------------- Page: 9 ----------------------
oSIST prEN 13141-7:2018
prEN 13141-7:2018 (E)

EN ISO 3743-2, Acoustics - Determination of sound power levels of noise sources using sound pressure -

Engineering methods for small, movable sources in reverberant fields - Part 2: Methods for special

reverberation test rooms (ISO 3743-2)

EN ISO 3744, Acoustics - Determination of sound power levels and sound energy levels of noise sources

using sound pressure - Engineering methods for an essentially free field over a reflecting plane (ISO 3744)

EN ISO 3745, Acoustics - Determination of sound power levels and sound energy levels of noise sources

using sound pressure - Precision methods for anechoic rooms and hemi-anechoic rooms (ISO 3745)

EN ISO 5135, Acoustics - Determination of sound power levels of noise from air-terminal devices, air-

terminal units, dampers and valves by measurement in a reverberation room (ISO 5135)

EN ISO 5136, Acoustics - Determination of sound power radiated into a duct by fans and other air-moving

devices - In-duct method (ISO 5136)
EN ISO 5801, Fans - Performance testing using standardized airways (ISO 5801)

EN ISO 9614-1, Acoustics - Determination of sound power levels of noise sources using sound intensity -

Part 1: Measurement at discrete points (ISO 9614-1)

EN ISO 9614-2, Acoustics - Determination of sound power levels of noise sources using sound intensity -

Part 2: Measurement by scanning (ISO 9614-2)

EN ISO 9614-3, Acoustics - Determination of sound power levels of noise sources using sound intensity -

Part 3: Precision method for measurement by scanning (ISO 9614-3)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN ISO 5801 and EN 12792 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
qve

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
transfer ratio

mass transfer of the discharged air to a zone (in Figure 2: from key 4 (extract) to key 5 (supply)) that is

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

---------------------- Page: 10 ----------------------
oSIST prEN 13141-7:2018
prEN 13141-7:2018 (E)
3.4
filter bypass leakage
air bypass around filter cells
3.5
maximum air volume flow at zero pressure
vmax,0

measured air volume flow corresponding to the maximum achievable fan curve setting of the unit, at

minimum static pressure difference p , which corresponds to 0 Pa static fan pressure p

s,ext fs
3.6
declared maximum air volume flow
vmax,d
maximum air volume flow of the unit declared by the manufacturer
3.7
maximum air volume flow
vmax

air volume flow corresponding to the maximum achievable fan curve setting of the unit at the pressure

p , either declared or measured
qvmax

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.
3.8
declared minimum air volume flow
vmin,d

minimum air volume flow of the unit at the reference pressure declared by the manufacturer

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.
3.9
reference air volume flow
vref
air volume flow corresponding to the reference pressure
Note 1 to entry: To determine reference air volume flow, see 7.2.2.3, Table 10.
3.10
fan pressure

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

unit outlet and the unit inlet
[SOURCE: EN ISO 5801:2008, 3.38]

Note 1 to entry: In case of similar cross-section areas of the inlet and outlet, the total pressure difference is

equal to the static pressure difference.
---------------------- Page: 11 ----------------------
oSIST prEN 13141-7:2018
prEN 13141-7:2018 (E)
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.
3.13
pressure at maximum air volume flow
qvmax
static pressure difference corresponding to the maximum air volume flow
3.14
reference pressure
ref
static pressure difference corresponding to the reference air volume flow
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
3.16
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
3.17
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.
3.18
maximum electrical power input
PE,max

electrical power input at maximum air volume flow q and its corresponding pressure p

vmax qvmax
---------------------- Page: 12 ----------------------
oSIST prEN 13141-7:2018
prEN 13141-7:2018 (E)
3.19
electrical power input at the reference volume flow
E,ref
electrical power input at reference air volume flow q and reference pressure p
vref ref
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 diameter of the measurement duct (see Figure 3) m
D , D Hydraulic diameters of the connecting duct (see Figure 3) m
h1 h2
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
pE static pressure difference Pa
p fan pressure Pa
p static fan 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
q maximum air volume flow m .s or m h or l.s
vmax
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 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
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 transfer ratio —
v air velocity in the measurement duct (see Figure 3) m.s
θ air temperature °C
---------------------- Page: 13 ----------------------
oSIST prEN 13141-7:2018
prEN 13141-7:2018 (E)
Symbol Designation Unit
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) —
ηθ, ex temperature ratio of the unit on exhaust air side —
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.
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.
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.
b a
II Regenerative heat exchangers (e.g. rotary heat exchanger ).

A rotary heat exchanger is a device incorporating a rotating wheel for the purpose of transferring

thermal energy (sensible or total) from one air stream to the other. It incorporates material allowing

latent heat transfer, a drive mechanism, a casing or frame, and includes any seals which are provided to

retard bypassing and leakage or air from one air stream to the other.

Regenerative heat exchangers have varying degrees of moisture recovery, depending on the material

used (e.g. "condensation rotor/non hygroscopic rotor", "hygroscopic rotor" and 'sorption rotor" heat

exchangers).
---------------------- Page: 14 ----------------------
oSIST prEN 13141-7:2018
prEN 13141-7:2018 (E)
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 or/and total transfer ratio in supply air;

— internal leakage or transfer ratio (R ) from extract to supply air or total transfer ratio (R ) in supply

s s
air;
— air flow/pressure curve.
Other characteristics such as filter bypass leakage are optional.

The tests for thermal performances shall not be made because of measurement uncertainty when

leakages according to 7.2.1 are too high. The unit shall have the leakage class specified in Table 3.

Table 3 — Classification requirements for thermal performance
Fan position required leakage class to
allow measurements
Exhaust fan upstream and supply fan downstream of the heat A1, B1
exchanger
Supply fan upstream and exhaust fan downstream of the heat A1, A2, B1, B2
exchanger
Other fan positions A1, A2, A3, B1, B2, B3
This configuration is not recommended for good indoor air quality.
The manufacturer shall declare:
— mandatory points:
— maximum air volume flow;
— minimum air volume flow;
— minimum outdoor operation temperature;
— filter classes supply and exhaust air;
— possibility of balancing the air volume flows;
— presence, type of by-pass and its control;
— frost protection function(s) and control (for cold climate test);
— category of heat exchanger;
---------------------- Page: 15 ----------------------
oSIST prEN 13141-7:2018
prEN 13141-7:2018 (E)

— adjustment of the purge sector and or the pressure settings on the wheel over the entire

operating range;
— nominal revolutions of the wheel;
— informal points:
— control parameter and sensors;
— type of fan and speed control;
— indented use;
— possible mounting positions.
7 Test methods
7.1 General

Tests shall be conducted with a unit containing all components as supplied for intended use, and

installed according to the manufacturer's instructions.

The mass flows q and q shall be measured in steady-state conditions at the same time.

m11 m22

The pressure difference shall be distributed 1/3 on the exhaust and outdoor side, and 2/3 on the supply

and extract side.

If internal and external leakage class A2 or better is reached, it can be assumed that q = q and

m11 m12

q = q and the pressure distribution between the inlet and outlet has no effect on the aerodynamic

m21 m22
measurements and the pressure distribution shall not be regarded.

Where a single value is assigned by the manufacturer as rated voltage, this shall be the test voltage.

Where a voltage range is assigned to the product by the
...