EN 13771-2:2017

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kompresorji in kondenzacijske enote za hladilne naprave - Preskušanje lastnosti in preskusne metode - 2. del: Kondenzacijske enoteKältemittel-Verdichter und Verflüssigungssätze für die Kälteanwendung - Leistungsprüfung und Prüfverfahren - Teil 2: VerflüssigungssätzeCompresseurs et unités de condensation pour la réfrigération - Essais de performance et méthodes d'essais - Partie 2 : Unités de condensationCompressors and condensing units for refrigeration - Performance testing and test methods - Part 2: Condensing units27.200Hladilna tehnologijaRefrigerating technology23.140VWURMLCompressors and pneumatic machinesICS:Ta slovenski standard je istoveten z:EN 13771-2:2017SIST EN 13771-2:2018en,fr,de01-marec-2018SIST EN 13771-2:2018SLOVENSKI
STANDARDSIST EN 13771-2:20081DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 13771-2
September
t r s y ICS
t uä s v râ
t yä t r r Supersedes EN
s u y y sæ tã t r r yEnglish Version
Compressors and condensing units for refrigeration æ Performance testing and test methods æ Part
tã Condensing units Compresseurs et unités de condensation pour la réfrigération æ Essais de performance et méthodes d 5essais æ Partie
t ã Unités de condensation
KältemittelæVerdichter und Verflüssigungssätze für die Kälteanwendung æ Leistungsprüfung und Prüfverfahren æ Teil
tã Verflüssigungssätze This European Standard was approved by CEN on
t x July
t r s yä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels
t r s y CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
s u y y sæ tã t r s y ESIST EN 13771-2:2018

European foreword . 3 1 Scope . 4 2 Normative references . 4 3 Terms, definitions and symbols . 4 3.1 Terms and definitions . 4 3.2 Symbols . 7 3.3 Refrigerant circuit state points . 10 4 Uncertainty of measurement and test conditions . 10 4.1 Uncertainty of performance data . 10 4.2 Uncertainty of measurement . 10 4.3 Test conditions . 12 5 General requirements . 13 5.1 Test equipment . 13 5.2 Calculation methods . 13 5.3 Requirements for the selection of test methods . 15 5.4 Test procedure . 15 5.5 Pressure and temperature measuring points. 15 5.6 Oil circulation . 16 5.7 Refrigerant composition. 16 5.8 Calibration and requirements regarding measurement uncertainty . 16 5.9 Source of refrigerant data . 17 5.10 Test setup for air cooled condensing units . 17 6 Test methods . 18 6.1 General . 18 6.2 List of test methods . 18 6.3 Method A: secondary fluid calorimeter on the suction side . 19 6.4 Method B: dry system refrigerant calorimeter on the suction side . 20 6.5 Method C: Water cooled condenser calorimeter . 22 6.6 Method D: Refrigerant gas flow meter on the suction side (see 6.6) . 23 6.7 Method E: refrigerant flow meter in the liquid line . 24 7 Determination of the power absorbed by the condensing unit . 26 7.1 General . 26 7.2 Calculation . 26 8 Test report . 27 8.1 General . 27 8.2 Test data . 28 8.3 Test results . 28 8.4 Overview of test values . 28 Bibliography . 30
subcritical transcritical
a) Single stage condensing units
subcritical transcritical
b) Two stage / open flash / condensing units
subcritical transcritical
c) Condensing units with economizer
subcritical transcritical
d) Condensing unit with internal HX Key 1 refrigerant gas at the compressor inlet 11 refrigerant gas at the condensing unit inlet 2 refrigerant gas at the compressor outlet 12 refrigerant liquid/fluid at the condensing unit outlet 5 refrigerant liquid/fluid at the expansion device inlet
Figure 1 — Condensing unit configurations SIST EN 13771-2:2018

¿T12 difference between the bubble point temperature of the refrigerant corresponding to the pressure at the condensing unit outlet and the temperature of the liquid refrigerant measured at the same place Note 1 to entry: Applicable for subcritical pressure only. 3.1.4 power absorbed P power demand to drive the condensing unit 3.1.5 refrigerant mass flow m refrigerant mass flow at the condensing unit inlet 3.1.6 coefficient of performance COPR ratio of the refrigerating capacity to the power absorbed Note 1 to entry: Both the above are at the specified test condition. 3.1.7 subcritical operation operating condition with condensing unit outlet pressure below the critical pressure of the refrigerant 3.1.8 transcritical operation operating condition with condensing unit outlet pressure above the critical pressure of the refrigerant 3.1.9 part load operation operation with active capacity control at reduced capacity for compressors with capacity control mechanism Note 1 to entry: On/off cycling of the compressor motor is not considered as capacity control. SIST EN 13771-2:2018
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