EN 13771-2:2017
(Main)Compressors and condensing units for refrigeration - Performance testing and test methods - Part 2: Condensing units
Compressors and condensing units for refrigeration - Performance testing and test methods - Part 2: Condensing units
This European Standard applies only to condensing units for refrigeration and describes a number of selected performance test methods. These methods provide sufficiently accurate results for the determination of the refrigerating capacity, power absorbed, refrigerant mass flow and the coefficient of performance.
This European Standard applies only to performance tests conducted at the manufacturer's works or wherever the instrumentation and load stability for testing to the accuracy required is available.
Kältemittel-Verdichter und Verflüssigungssätze für die Kälteanwendung - Leistungsprüfung und Prüfverfahren - Teil 2: Verflüssigungssätze
Compresseurs et unités de condensation pour la réfrigération - Essais de performance et méthodes d'essais - Partie 2 : Unités de condensation
La présente Norme européenne s’applique uniquement aux unités de condensation pour la réfrigération et décrit une sélection de méthodes d’essai des performances. Ces méthodes fournissent des résultats d’une exactitude suffisante pour déterminer la puissance frigorifique, la puissance absorbée, le débit masse du fluide frigorigène et le coefficient de performance.
La présente Norme européenne s’applique uniquement aux essais de performance conduits dans les usines des fabricants ou en des endroits où l’on dispose de l’instrumentation et d’une stabilité de charge permettant d’effectuer les essais avec l’exactitude requise.
Kompresorji in kondenzacijske enote za hladilne naprave - Preskušanje lastnosti in preskusne metode - 2. del: Kondenzacijske enote
Ta evropski standard se uporablja samo za kondenzatorske enote za hlajenje in opisuje izbrane metode za preskušanje zmogljivosti. Te metode zagotavljajo dovolj natančne rezultate za določanje zmogljivosti hlajenja, porabe energije, pretoka hladilne tekočine in koeficienta zmogljivosti.
Ta evropski standard se uporablja le pri preskušanju lastnosti v tovarni proizvajalca ali povsod, kjer so na voljo instrumenti in stabilnost bremena za preskušanje pri zahtevani natančnosti.
General Information
Relations
Overview
EN 13771-2:2017 is the CEN European Standard that defines performance testing and test methods for condensing units used in refrigeration. It specifies selected, repeatable test procedures to determine the main performance parameters: refrigerating capacity, power absorbed, refrigerant mass flow and coefficient of performance (COP). The standard is intended for controlled, instrumented tests carried out at the manufacturer’s works or other facilities that can meet the required instrumentation and load stability.
Key topics and technical requirements
- Scope & test environment: Applies only to condensing units and only to manufacturer/workshop-level performance tests where required accuracy and stability are available.
- Performance parameters: Refrigerating capacity, electrical/mechanical power absorbed, refrigerant mass flow and COP.
- Measurement uncertainty: Target uncertainties for final results - refrigerating capacity ±2.5%, electrical power ±1%, mechanical power ±2.5%. Measurement instruments must meet specified uncertainty limits (e.g., pressure ±1%, temperatures, flow, torque etc.) to achieve these targets.
- Test methods: Five principal methods are described:
- Method A - Secondary fluid calorimeter on the suction side
- Method B - Dry system refrigerant calorimeter on the suction side
- Method C - Water-cooled condenser calorimeter
- Method D - Refrigerant gas flow meter on the suction side
- Method E - Refrigerant flow meter in the liquid line
- General requirements: Test equipment, calculation methods, selection of test method, test procedure, measurement points, oil circulation, refrigerant composition and calibration requirements are defined to reduce uncertainty.
- Special operations: Provisions for transcritical operation and cyclic (part‑load) capacity control are included.
- Reporting: Clause structure includes determination of absorbed power and a standardized test report format (required test data and results).
Practical applications - who uses this standard
- Condensing unit manufacturers - for product development, factory acceptance testing and quality control.
- Third‑party test laboratories - to deliver comparable, accredited performance measurements.
- OEMs and system integrators - to validate component performance and specify units for refrigeration systems.
- Regulatory and certification bodies - to verify compliance with declared performance.
- R&D and performance engineers - for benchmarking, efficiency optimisation and transcritical system testing.
Related standards
- EN 13771‑1 (Compressors) - aligns symbols and indexes
- EN 327 and EN 14511‑3 - test room and setup details referenced to reduce uncertainty
- EN 378‑1 / EN 378‑2 - refrigerating systems safety and design
- ISO 817 - refrigerant designation and safety classification
Keywords: condensing units, refrigeration performance testing, test methods, refrigerating capacity, COP, refrigerant mass flow, measurement uncertainty, calorimeter, transcritical operation.
Standards Content (Sample)
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
f electrical frequency Hz F heat leakage factor W/K h specific enthalpy J/kg n compressor speed 1/min P power absorbed W Pm actual compressor power absorbed where the motor is not an integral part of the unit W Pel actual compressor power absorbed where the motor is an integral part of the unit W Pf power absorbed by the fans and other regularly furnished auxiliaries W Ph electrical power input to the heater W p absolute pressure MPa m mass flow kg/s V volume flow m3/s
¿T12 subcooling K t temperature °C tcal mean surface temperature of the calorimeter °C ts1 inlet temperature of heating or cooling liquid °C ts2 outlet temperature of heating or cooling liquid °C tmid mean of the bubble and dew point temperature of the refrigerant at the condensing unit outlet pressure °C tbs bubble temperature of the secondary fluid °C tx reference temperature °C U nominal electrical voltage V v specific volume of refrigerant gas m3/kg
density of the refrigerant gas/fluid; indexed for other fluids kg/m3 Qi heat flow to the calorimeter W Q refrigerating capacity W xoil oil circulation ratio — SIST EN 13771-2:2018
1 refrigerant gas at the compressor inlet
2 refrigerant gas at the compressor outlet
3 condenser inlet
4 condenser outlet
5 inlet expansion device
6 evaporator (or calorimeter) outlet
11 condensing unit inlet
12 condensing unit outlet
a actual
A air
amb ambient
cal calorimeter surface
f heat transfer fluid
in inlet
M flow meter
oil oil
out outlet
s secondary fluid (secondary refrigerant, brine or water)
x oil/liquid refrigerant mixture
F fans and other auxiliary components
a) Circuit diagram b) Pressure vs enthalpy diagram Key 1 refrigerant gas at the compressor inlet A compressor 2 refrigerant gas at the compressor outlet B condenser (including any receiver and/or sub-cooler 3 refrigerant gas at the condenser inlet
forming an integral part of the unit) 4 refrigerant liquid at the condenser outlet C expansion device 5 refrigerant liquid at the expansion device inlet D evaporator 6 refrigerant gas at the evaporator outlet
11 refrigerant gas at the condensing unit inlet
12 refrigerant liquid at the condensing unit outlet
Figure 2 — Refrigerant circuit 4 Uncertainty of measurement and test conditions 4.1 Uncertainty of performance data Measuring instruments shall be selected and calibrated so that the final result is within the maximum uncertainties of the measured value as indicated: — refrigerating capacity: ± 2,5 %, — electrical power absorbed: ± 1 % and — mechanical power absorbed: ± 2,5 %. 4.2 Uncertainty of measurement Uncertainty values are considered to cover a 95 % confidence interval, i.e. ± 2 times the standard deviation. Except where otherwise stated in the particular clauses, measurements shall be carried out within the maximum uncertainty of the measured value as given in Table 3. SIST EN 13771-2:2018
— current A ±1 % — frequency s «1 ±1 % — power (except for fans and auxiliaries) W ±1 % — power of fans and auxiliaries W ±3 % — voltage V ±1 % Refrigerant flow kg/s ±1 % Rotational speed min «1 ±0,07 % Mass kg ±0,2 % Temperatures
— temperature for differences (for individually calibrated sensors) °C ±0,05 K — temperature differences (for calibrated sensor pairs) K ±1 % — other temperatures °C ±0,3 K Time interval s ±0,1 % Torque Nm ±1 % Water flow kg/s ±1 % Length, width or height m ±2 % Adherence to the limits listed in this table does not ensure the requirements of 4.1 are obtained automatically. SIST EN 13771-2:2018
¿T12 0 K to +1 K Nominal compressor speed, n ±1,0 % Nominal electrical voltage, U ±1,5 % Nominal electrical frequency, f ±1,0 % Air inlet temperature at condenser/gas cooler, tA ±1,0 K Liquid temperature at condenser, ts1 ±0,5 K Liquid temperature at condenser b, ts2 ±0,5 K Liquid flow rate through the condenser, ms ±1,5 % Ambient temperature c, tamb ±3,0 K a Dynamic deviations due to pulsations are not considered. b May be used as an alternative to liquid flow rate. c Other than air inlet temperatures. The values for the relevant specified test conditions shall be recorded. For the calculation of refrigeration capacity - additional values might be needed: — gas cooler outlet temperature in case of transcritical operation. For cyclic capacity control the deviations of Table 4 refer to the average values per control cycle. For operation with constant capacity, the deviations can be applied either — to every single recorded value, or — to the average values per minute, or — to the average of the values for the test period, ± 2 times standard deviation of the measured values. The air inlet temperature tA is the average instantaneous value of all temperature sensors. SIST EN 13771-2:2018
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Frequently Asked Questions
EN 13771-2:2017 is a standard published by the European Committee for Standardization (CEN). Its full title is "Compressors and condensing units for refrigeration - Performance testing and test methods - Part 2: Condensing units". This standard covers: This European Standard applies only to condensing units for refrigeration and describes a number of selected performance test methods. These methods provide sufficiently accurate results for the determination of the refrigerating capacity, power absorbed, refrigerant mass flow and the coefficient of performance. This European Standard applies only to performance tests conducted at the manufacturer's works or wherever the instrumentation and load stability for testing to the accuracy required is available.
This European Standard applies only to condensing units for refrigeration and describes a number of selected performance test methods. These methods provide sufficiently accurate results for the determination of the refrigerating capacity, power absorbed, refrigerant mass flow and the coefficient of performance. This European Standard applies only to performance tests conducted at the manufacturer's works or wherever the instrumentation and load stability for testing to the accuracy required is available.
EN 13771-2:2017 is classified under the following ICS (International Classification for Standards) categories: 23.140 - Compressors and pneumatic machines; 27.200 - Refrigerating technology. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 13771-2:2017 has the following relationships with other standards: It is inter standard links to EN 13771-2:2007. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 13771-2:2017 is associated with the following European legislation: EU Directives/Regulations: 2009/125/EC; Standardization Mandates: M/495. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
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