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SLOVENSKI STANDARD
01-junij-2022
Nadomešča:
SIST EN 308:1997
Prenosniki toplote - Preskusni postopki za ugotavljanje lastnosti komponent za
rekuperacijo toplote zrak-zrak
Heat exchangers - Test procedures for establishing performance of air to air heat
recovery components
Wärmeaustauscher - Prüfverfahren zur Bestimmung der Leistungskriterien von Luft/Luft-
Wärmerückgewinnungsanlagen
Échangeurs thermiques - Procédures d'essai pour la détermination de la performance
des composants de récupération de chaleur air/air
Ta slovenski standard je istoveten z: EN 308:2022
ICS:
27.060.30 Grelniki vode in prenosniki Boilers and heat exchangers
toplote
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 308
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2022
EUROPÄISCHE NORM
ICS 27.060.30 Supersedes EN 308:1997
English Version
Heat exchangers - Test procedures for establishing
performance of air to air heat recovery components
Échangeurs thermiques - Procédures d'essai pour la Wärmeaustauscher - Prüfverfahren zur Bestimmung
détermination de la performance des composants de der Leistungskriterien von Luft/Luft-
récupération de chaleur air/air Wärmerückgewinnungsanlagen
This European Standard was approved by CEN on 13 September 2021.
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, Turkey 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 308:2022 E
worldwide for CEN national Members.
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 7
3 Terms and definitions . 7
3.1 Air categories . 7
3.2 Thermal performance characteristics . 8
3.3 Air flow and leakage . 10
3.4 Pressure . 12
3.5 General terms and definitions . 13
3.6 Categories of heat recovery components . 13
3.7 Test types . 16
3.8 Uncertainty of measurement . 17
4 Symbols and abbreviations . 19
4.1 Symbols . 19
4.2 Subscripts . 21
4.3 Abbreviations . 21
5 Test requirements . 22
5.1 Specification of the-heat recovery components . 22
5.2 Precision classes . 22
5.3 Measurement equipment . 24
5.4 Determination of the air flow rates . 27
5.5 Test in laboratory . 28
5.6 Leakages . 30
5.7 Heat recovery components with run around coil system . 31
5.8 Uncertainty of the outdoor air correction factor . 31
6 Test procedures . 32
6.1 General. 32
6.2 Test type A . 49
6.3 Test type B . 53
6.4 Test type C . 56
7 Test Results . 57
7.1 Description of the heat recovery components concept, geometry and features . 57
7.2 Leakage . 59
7.3 Efficiency . 60
7.4 Pressure drop . 60
7.5 Other indications . 60
7.6 Reporting of values and precision . 60
7.7 Test report . 62
Annex A (informative) Testing equipment . 63
Annex B (informative) Deviation of different humidity definitions . 71
Annex C (normative) Uncertainty of measurement . 72
Annex D (informative) Estimation of Exhaust air transfer ratio . 78
Annex E (normative) Simplified test setup for static internal leakage . 81
Annex F (informative) Overviews of test procedures . 82
Bibliography . 86
European foreword
This document (EN 308:2022) has been prepared by Technical Committee CEN/TC 110 “Heat
exchangers”, the secretariat of which is held by DIN.
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 September 2022, and conflicting national standards shall
be withdrawn at the latest by September 2022.
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 308:1997.
This edition includes the following significant technical changes with respect to EN 308:1997:
— Scope: flue gas heat recovery devices are no more included.
— In addition to laboratory tests of heat recovery components (HRC), laboratory tests for HRC fitted
into air handling units and on-site tests of HRC are defined.
— Different precision classes for tests are defined.
— Leakage testing has been refined. Exhaust air transfer ratio (EATR) and outdoor air correction factor
(OACF) are implemented.
— Differences of the sensible and latent efficiency can occur due to leakages and bad heat balance.
— Several terms and definitions are changed, e.g. categories of heat recovery components.
— Type A test is only on the heat exchanger and does not necessarily give a representative value when
it is installed, corrections may be needed.
EN 13053 refers to EN 308 regarding the test setup and the test procedure. EN 13053 is a standard
harmonized with the Commission Regulation (EU) 1253/2014 [5].
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, Turkey and the United
Kingdom.
Introduction
This document specifies methods for the performance testing of air-to-air heat recovery components
(HRC) used in ventilation systems. This document does not contain any information on air handling units,
ductwork and components of air distribution, which are covered by other European Standards. The
document applies for laboratory and in on-site testing. Further it applies to different purposes of tests,
which can be e.g. certification of products, acceptance of installed products, market surveillance or quality
tests of manufacturers.
These different applications do not require the same precision of measurements results. Therefore,
different precision classes are defined. Table 1 gives informative examples for the application of the
different test types and precision classes. For low quality products, low quality installations and/or
simplified testing, a ‘not classified’ precision class can occur for all test types.
Table 1 — Examples for the application of the different test types and precision classes
Precision class P1 Precision class P2 Precision class P3 not classified
Test Type
(high precision) (medium precision) (low precision)
Test type A — certification or — test of — not intended use — not intended
declaration of functionality use
HRC installed in a test
products
casing or HRC-section
— performance test
Tested in laboratory
Test type B — test under ideal — certification or — test of — not intended
conditions declaration of functionality use
HRC installed in an
products
a
AHU
— performance test
Tested in laboratory
Test type C — not intended use, — test under ideal — typical test — test of
but possible conditions in real conditions in real functionality
HRC installed in an
under ideal systems systems
a
AHU or in duct work of
conditions and
— performance test
an installed ventilation
laboratory-like
system
test equipment
Tested on-site
a
The HRC is installed in an AHU (air handling unit) by the manufacturer of the AHU.
Customers and manufacturers are free to define the aspired precision class for testing of their products,
but it will be taken into account that the available precision class depends on the test conditions, the HRC
itself, the measurement equipment and the environment conditions.
This document is one of a series of European Standards dedicated to heat exchangers.
Note 1 Testing procedure of residential ventilation units, RVU’s, is covered by EN 13141-7 and EN 13141-8.
Note 2
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