EN 328:2014

Heat exchangers - Forced convection unit air coolers for refrigeration - Test procedures for establishing the performance

This European Standard is applicable to non-ducted unit air coolers for refrigeration operating:
a)   with direct dry expansion of a refrigerant;
b)   with liquid overfeed by pump circulation of a refrigerant;
c)   with a liquid.
This standard specifies uniform methods of performance assessment to test and ascertain the following:
-                product identification;
-   standard capacity;
-   standard liquid pressure drop;
-   standard refrigerant pressure drop (for operation with liquid overfeed by pump circulation only);
-   nominal air flow rate;
-   nominal fan power.
It does not cover evaluation of conformity.
It is not applicable to air coolers for duct mounting or with natural air convection.
This standard does not cover technical safety aspects.

Wärmeübertrager - Ventilatorluftkühler - Prüfverfahren zur Leistungsfeststellung

Diese Europäische Norm gilt für kanallose Ventilatorluftkühler zum Einsatz in Kälteanlagen:
a)   mit direkter trockener Expansion eines Kältemittels;
b)   mit Flüssigkeitspumpenumwälzung eines Kältemittels;
c)   mit einem Kälteträger.
Diese Norm legt einheitliche Verfahren zur Leistungsbewertung fest, um Folgendes zu prüfen und sicherzu-stellen:
-   Produktkennzeichnung;
-   Normleistung;
-   kälteträgerseitiger Normdruckabfall;
-   kältemittelseitiger Normdruckabfall (nur für den Betrieb mit Flüssigkeitspumpenumwälzung);
-   Nenn-Luftdurchfluss;
-   Nenn-Ventilatorleistungsaufnahme.
Diese Norm behandelt nicht die Konformitätsbewertung.
Sie gilt nicht für kanalmontierte Ventilatorluftkühler oder Luftkühler mit freier Konvektion.
Sicherheitstechnische Gesichtspunkte sind nicht Gegenstand dieser Europäischen Norm.

Echangeurs thermiques - Aérofrigorifères à convection forcée pour la réfrigération - Procédures d'essai pour la détermination de la performance

La présente Norme européenne s'applique aux aérofrigorifères non raccordés utilisés dans les situations suivantes :
a)   expansion directe à sec du fluide frigorigène ;
b)   suralimentation en liquide par circulation du fluide frigorigène au moyen d'une pompe ;
c)   fonctionnement avec un liquide.
La présente Norme spécifie des méthodes uniformes d'évaluation de la performance afin de soumettre à l'essai et de déterminer les caractéristiques suivantes :
-   identification du produit ;
-   puissance normale ;
-   chute de pression normale du liquide ;
-   chute de pression normale du fluide frigorigène (uniquement pour les utilisations avec suralimentation en liquide par circulation du fluide frigorigène au moyen d'une pompe) ;
-   débit d'air nominal ;
-   puissance nominale du ventilateur.
La présente Norme ne traite pas de l'évaluation de la conformité.
Elle ne s'applique pas aux aérofrigorifères destinés à être montés dans des gaines ou à convection naturelle par air.
La présente Norme ne traite pas des aspects techniques de sécurité.

Prenosniki toplote - Hladilniki zraka s prisilno konvekcijo za hlajenje - Postopki preskušanja za ugotavljanje lastnosti

Ta evropski standard se uporablja za brezkanalne hladilnike zraka za hlajenje, ki delujejo:
a) z neposredno suho širitvijo hladiva;
b) s pretiranim dotokom tekočine s črpalnim kroženjem hladiva;
c) s tekočino.
Ta standard določa enotne metode ocenjevanja lastnosti za preskušanje in ugotavljanje naslednjega:
– identifikacije proizvoda;
– običajne kapacitete;
– običajnega padca tlaka na strani tekočine;
– običajnega padca tlaka na strani hladiva (le za delovanje s pretiranim dotokom tekočine s črpalnim kroženjem);
– nazivnega pretoka zraka;
– nazivne moči ventilatorja.
Standard ne obravnava vrednotenja skladnosti. Ne uporablja se za hladilnike zraka za kanalsko vgradnjo ali z naravno konvekcijo zraka. Ta standard ne obravnava tehničnih varnostnih vidikov.

General Information

• Status: Published
• Publication Date: 26-Aug-2014
• ICS: 23.120 - Ventilators. Fans. Air-conditioners
• ICS: 27.060.30 - Boilers and heat exchangers
• Technical Committee: CEN/TC 110 - Heat exchangers
• Drafting Committee: CEN/TC 110/WG 1 - Heat exchangers used in the field of refrigeration and air conditioning
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Completion Date: 04-Mar-2020
• Ref Project: SIST EN 328:2014 - Heat exchangers - Forced convection unit air coolers for refrigeration - Test procedures for establishing the performance

Relations

• Replaces: EN 328:1999 - Heat exchangers - Test procedures for establishing the performance of forced convection unit air coolers for refrigeration
• Effective Date: 08-Jun-2022
• Replaces: EN 328:1999/A1:2002 - Heat exchangers - Test procedure for establishing the performance of forced convection unit air coolers for refrigeration
• Effective Date: 03-Sep-2014

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2014
1DGRPHãþD
SIST EN 328:1999
SIST EN 328:1999/A1:2004
Prenosniki toplote - Hladilniki zraka s prisilno konvekcijo za hlajenje - Postopki
preskušanja za ugotavljanje lastnosti
Heat exchangers - Forced convection unit air coolers for refrigeration - Test procedures
for establishing the performance
Wärmeaustauscher - Prüfverfahren zur Bestimmung der Leistungskriterien von
Ventilatorluftkühlern
Échangeurs thermiques - Procédures d'essai pour la détermination de la performance
des aérofrigorifères à convection forcée
Ta slovenski standard je istoveten z: EN 328:2014
ICS:
23.120 =UDþQLNL9HWUQLNL.OLPDWVNH Ventilators. Fans. Air-
QDSUDYH conditioners
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.

EUROPEAN STANDARD
EN 328
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2014
ICS 23.120; 27.060.30 Supersedes EN 328:1999
English Version
Heat exchangers - Forced convection unit air coolers for
refrigeration - Test procedures for establishing the performance
Echangeurs thermiques - Aérofrigorifères à convection Wärmeübertrager - Ventilatorluftkühler - Prüfverfahren zur
forcée pour la réfrigération - Procédures d'essai pour la Leistungsfeststellung
détermination de la performance
This European Standard was approved by CEN on 22 May 2014.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, 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: Avenue Marnix 17, B-1000 Brussels
© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 328:2014 E
worldwide for CEN national Members.

Contents Page
Foreword .4
Introduction .5
1 Scope .6
2 Normative references .6
3 Terms and definitions .6
4 Symbols . 11
5 Standard capacity . 13
5.1 Basis of standard capacity data . 13
5.2 Standard conditions for the cooling capacity . 14
5.2.1 General . 14
5.2.2 Refrigerants . 14
5.2.3 Liquids . 15
5.3 Conditions for the nominal air flow rate . 15
5.4 Conditions for nominal fan power . 15
6 Manufacturer's data . 15
7 Measurements . 16
7.1 Uncertainty of measurements . 16
7.2 Measurement criteria . 17
7.2.1 Pipe side temperature measurement . 17
7.2.2 Superheating temperature . 18
7.2.3 Temperature at expansion device inlet . 18
7.2.4 Liquid temperatures . 18
7.2.5 Water temperatures (balancing air heater) . 18
7.2.6 Air temperature measurement . 18
7.2.7 Pressure measuring points . 19
7.2.8 Flow rates . 19
7.2.9 Oil content . 19
7.2.10 Non azeotropic refrigerant . 19
8 Testing methods and equipment . 20
8.1 Testing methods . 20
8.1.1 Capacity . 20
8.1.2 Air flow . 20
8.1.3 Heat exchange with the ambient . 20
8.2 Equipment . 20
8.2.1 Calorimeter room . 20
8.2.2 Refrigerant / liquid pipes . 22
8.2.3 Expansion device. 22
8.2.4 Flashgas . 22
8.2.5 Air flow measurement . 22
8.2.6 Liquid receiver . 22
9 Test procedures . 23
9.1 General . 23
9.2 Calibration of the calorimeter room . 23
9.3 Measurement of the cooling capacity . 24
9.3.1 Air humidity . 24
9.3.2 Subcooled refrigerant temperature. 24
9.3.3 Steady-state conditions . 24
9.3.4 Test duration . 24
9.3.5 Conducting the test . 25
9.3.6 Air inlet temperature . 26
9.3.7 Data to be recorded . 26
9.4 Measuring the fan performance . 26
10 Calculating the cooling capacity . 27
10.1 Heat loss factor . 27
10.2 Cooling capacity . 27
10.2.1 From the air side energy input . 27
10.2.2 From flow rate of refrigerant . 27
10.2.3 From the flow rate of liquid . 27
10.2.4 Measured capacity . 28
11 Conversion to standard conditions . 28
11.1 Cooling capacity . 28
11.1.1 General correction for atmospheric pressure . 28
11.1.2 Refrigerants with direct expansion operation . 28
11.1.3 Refrigerants - operation with liquid overfeed by pump circulation . 29
11.1.4 Liquids . 29
11.2 Calculating the standard liquid side pressure drop . 30
11.2.1 General . 30
11.2.2 Single Test . 30
11.2.3 Duplicate Tests . 30
11.3 Nominal air flow . 31
11.4 Nominal fan power . 31
12 Test report . 31
Annex A (informative) Bubble point temperature . 32
A.1 Diagram bubble point temperature . 32
Annex B (normative) Test installation for direct expansion operation . 33
Annex C (normative) Test installation for liquids . 35
Annex D (informative) Superheating and capacity . 36
Annex E (normative) Test arrangement .
...