EN 308:2022
(Main)Heat exchangers - Test procedures for establishing performance of air to air heat recovery components
Heat exchangers - Test procedures for establishing performance of air to air heat recovery components
This document specifies methods to be used for testing of air-to-air heat recovery components (HRC). The main purpose of the HRC is to exchange heat between exhaust air and supply air in order to save energy, which results in
— preheat or heat, and/or
— precool or cool
supply air in ventilation systems or air conditioning systems. Optionally HRC can exchange air humidity between exhaust and supply air. The HRC contains the heat exchangers and all necessary features and auxiliary devices for the exchange of sensible heat and (if available) air humidity between exhaust air and supply air. The HRC will be installed in casings or ducts. If fans are part of the test unit, the effect of the fan power on the measured values will be corrected.
This document specifies procedures and input criteria required for tests to determine the performance of a HRC at one or several test conditions, each of them with continuous and stationary air flows, air temperatures and humidities at both inlet sides. Three different test types are covered:
— Test type A, Laboratory testing of HRC installed in test casings (A1) or a HRC sections (A2);
— Test type B, Laboratory testing of HRC installed in non-residential ventilation units in design configuration;
— Test type C, on-site (field) testing of HRC in non-residential ventilation units (C1) or a HRC sections (C2) in operation configuration.
This document is applicable to recuperators, regenerators, and HRC with intermediary heat transfer medium.
This document prescribes test methods for determining:
1) the temperature and humidity efficiency,
2) the pressure drop of exhaust air and supply air sides,
3) possible internal leakages; exhaust air transfer ratio (EATR) and outdoor air correction factor (OACF),
4) external leakages and
5) auxiliary energy used for the operation of the HRC.
HRC using heat pumps are not covered by this document.
Wärmeübertrager - Prüfverfahren zur Bestimmung der Leistungskriterien von Luft/Luft- Wärmerückgewinnungskomponenten
Dieses Dokument legt Verfahren für die Prüfung von Luft-Luft-Wärmerückgewinnungskomponenten (HRC) fest. Der Hauptzweck der HRC besteht in dem Wärmeaustausch zwischen Abluft und Zuluft, um Energie zu sparen. Dies führt zu
— Vorerwärmung oder Erwärmung und/oder
— Vorkühlung oder Kühlung von
Zuluft in Belüftungssystemen oder Klimaanlagen. Optional kann die HRC Luftfeuchte zwischen Abluft und Zuluft austauschen. Die HRC enthält die Wärmeübertrager und alle notwendigen Funktionen und Hilfsgeräte für den Austausch sensibler Wärme und (sofern verfügbar) Luftfeuchte zwischen Abluft und Zuluft. Die HRC wird in Gehäusen oder Kanälen installiert. Wenn Ventilatoren Teil des Prüfgeräts sind, wird die Auswirkung der Ventilatorenleistung auf die Messwerte korrigiert.
Dieses Dokument legt Verfahren und Eingangskriterien für Prüfungen zur Bestimmung der Leistung einer HRC bei einer oder mehreren Prüfbedingungen fest, jeweils mit kontinuierlichen oder stationären Luftströmen, Lufttemperaturen und Luftfeuchtewerten an beiden Eingangsseiten. Drei verschiedene Prüfarten werden behandelt:
— Prüfart A, Laborprüfung von in Prüfgehäusen (A1) oder HRC-Abschnitten (A2) installierten HRC;
— Prüfart B, Laborprüfung von in Nichtwohnraumlüftungsgeräten in Bemessungskonfiguration installierten HRC;
— Prüfart C, Vor-Ort-Prüfung (Feldprüfung) von HRC in Nichtwohnraumlüftungsgeräten (C1) oder HRC Abschnitten (C2) in Betriebskonfiguration.
Dieses Dokument ist anzuwenden für Rekuperatoren, Regeneratoren und HRC mit zwischengeschaltetem Wärmeübertragungsmedium.
Dieses Dokument schreibt Prüfverfahren für die Bestimmung:
1) der Temperatur- und Feuchteeffizienz ;
2) des Druckabfalls auf der Abluft- und Zuluftseite;
3) möglicher Innenleckage, des Abluftübertragungsverhältnisses (EATR) und des Außenluftkorrekturfaktors (OACF);
4) von Außenleckage und
5) der für den Betrieb der HRC verwendeten Hilfsenergie vor.
HRC, die Wärmepumpen verwenden, werden in diesem Dokument nicht behandelt.
Échangeurs thermiques - Procédures d'essai pour la détermination de la performance des composants de récupération de chaleur air/air
Le présent document précise les méthodes à utiliser pour les essais sur les composants de récupération de chaleur air-air (HRC). L'objectif principal du HRC est d'échanger la chaleur entre l'air extrait et l'air neuf afin d'économiser l'énergie, ce qui se traduit par
— le préchauffage ou chauffage, et/ou
— le pré-refroidissement ou refroidissement
de l'air fourni dans les systèmes de ventilation ou de climatisation. Le cas échéant, les HRC peuvent échanger de l'humidité de l'air entre l'air extrait et l'air neuf. Le HRC contient les échangeurs thermiques et l'ensemble des fonctions et dispositifs auxiliaires nécessaires à l'échange de chaleur sensible et (si disponible) d'humidité de l'air entre l'air extrait et l'air neuf. Les HRC seront installés dans des enveloppes ou des conduits. Si les ventilateurs font partie de l'unité d'essai, l'effet de la puissance du ventilateur sur les valeurs mesurées sera corrigé.
Le présent document précise les procédures et les critères d'entrée requis pour les essais visant à déterminer la performance d'un HRC dans une ou plusieurs conditions d'essai, chacune d'entre elles ayant des flux d'air, des température et taux d'humidité de l'air continus et stationnaires des deux côtés d'entrée. Trois types d'essais différents sont traités :
— Type d'essai A, essais en laboratoire du HRC installé dans des enveloppes d'essai (A1) ou dans des sections (A2) de HRC ;
— Type d'essai B, essais en laboratoire du HRC installé dans des unités de ventilation non résidentielles en configuration de conception ;
— Essai de type C, essai sur site (sur le terrain) du HRC dans des unités de ventilation non résidentielles (C1) ou dans des sections (C2) de HRC en configuration de fonctionnement.
Le présent document s'applique aux récupérateurs, régénérateurs et HRC avec fluide intermédiaire.
Le présent document décrit des méthodes d'essai pour déterminer :
1) le rendement en température et en humidité,
2) la chute de pression côtés air extrait et air neuf,
3) les fuites internes éventuelles ; le rapport de transfert d'air extrait (EATR) et le facteur de correction d'air extérieur (OACF),
4) les fuites externes et
5) l'énergie auxiliaire utilisée pour le fonctionnement du HRC.
Les HRC utilisant des pompes à chaleur ne sont pas couverts par le présent document.
Prenosniki toplote - Preskusni postopki za ugotavljanje lastnosti komponent za rekuperacijo toplote zrak-zrak
Ta evropski standard določa metode, ki se uporabljajo za preskušanje komponent za rekuperacijo toplote zrak-zrak (HRC). Glavni namen komponente za rekuperacijo toplote je:
– predgretje ali segrevanje in/ali
– predhodno hlajenje ali hlajenje
dovajanje zraka v prezračevalne ali klimatske sisteme. Izbirna komponenta za rekuperacijo toplote lahko izmenjuje vlažnost zraka med odvodnim in dovodnim zrakom. Komponenta za rekuperacijo toplote vsebuje toplotne izmenjevalnike in ima vse potrebne lastnosti ter pomožne naprave za izmenjavo zaznavne toplote in (če je na voljo) vlažnost zraka med odvodnim in dovodnim zrakom. Komponenta za rekuperacijo toplote se namesti v ohišja ali zračne kanale. Če so ventilatorji del preskusne enote, je treba popraviti učinek moči ventilatorja na izmerjene vrednosti.
Ta evropski standard določa postopke in vhodna merila, ki so potrebna za preskuse delovanja komponent za rekuperacijo toplote pri enem ali več preskusnih pogojih, pri vsakem od njih z neprekinjenimi zračnimi tokovi, temperaturami zraka in vlažnostjo na obeh vstopnih straneh. Zajete so tri različne vrste preskusov:
– laboratorijsko preskušanje komponent za rekuperacijo toplote;
– laboratorijsko preskušanje komponent za rekuperacijo toplote, nameščenih v nestanovanjskih klimatskih
napravah (opredelitev v skladu z Uredbo Komisije (EU) št. 1253/2014) v načrtovalni konfiguraciji;
– preskušanje delujočih komponent za rekuperacijo toplote na mestu uporabe (terensko) v nestanovanjskih klimatskih napravah
ali sistemih v obratovalni konfiguraciji.
Ta evropski standard se uporablja za rekuperatorje in regeneratorje, namenjene izmenjavi zaznavne toplote in po izbiri za izmenjavo vlažnosti zraka.
Ta evropski standard določa preskusne metode za določanje:
1. učinkovitosti temperature in vlažnosti,
2. padca tlaka odvodnega in dovodnega zraka,
3. morebitnega notranjega puščanja; razmerje prenosa odvodnega zraka (EATR) in
korekcijskega faktorja za zunanji zrak (OACF) ter
4. pomožne energije, ki se uporablja za delovanje komponent za rekuperacijo toplote.
Ta standard ne zajema komponent za rekuperacijo toplote, ki uporabljajo toplotne črpalke.
General Information
Relations
Standards Content (Sample)
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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