EN 13771-2-2017 en Compressors and condensing units for refrigeration - Performance testing and test methods - Part 2 Condensing units.pdf

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1、Compressors and condensing units for refrigeration Performance testing and test methodsPart 2: Condensing unitsBS EN 137712:2017BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 13771-2 September 2017 ICS 23.140; 27.

2、200 Supersedes EN 13771-2:2007English Version Compressors and condensing units for refrigeration - Performance testing and test methods - Part 2: Condensing units Compresseurs et units de condensation pour la rfrigration - Essais de performance et mthodes dessais - Partie 2 : Units de condensation K

3、ltemittel-Verdichter und Verflssigungsstze fr die Klteanwendung - Leistungsprfung und Prfverfahren - Teil 2: Verflssigungsstze This European Standard was approved by CEN on 26 July 2017. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for givi

4、ng 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 offi

5、cial 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

6、 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, Serbia, Slovakia, Slovenia,

7、 Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worl

8、dwide for CEN national Members. Ref. No. EN 13771-2:2017 ENational forewordThis British Standard is the UK implementation of EN 137712:2017. It supersedes BS EN 137712:2007 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee RHE/4, Testing of refrigerant c

9、ompressors.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2017 Published by

10、 BSI Standards Limited 2017ISBN 978 0 580 95319 4ICS 23.140; 27.200Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 September 2017.Amendments/corrigenda issued

11、 since publicationDate Text affectedBRITISH STANDARDBS EN 137712:2017EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 13771-2 September 2017 ICS 23.140; 27.200 Supersedes EN 13771-2:2007English Version Compressors and condensing units for refrigeration - Performance testing and test methods - Pa

12、rt 2: Condensing units Compresseurs et units de condensation pour la rfrigration - Essais de performance et mthodes dessais - Partie 2 : Units de condensation Kltemittel-Verdichter und Verflssigungsstze fr die Klteanwendung - Leistungsprfung und Prfverfahren - Teil 2: Verflssigungsstze This European

13、 Standard was approved by CEN on 26 July 2017. 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 concerni

14、ng 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 i

15、ts 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, Germ

16、any, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KO

17、MITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13771-2:2017 EBS EN 137712:2017EN 13771-2:2017 (E) 2 Contents Page European foreword . 3 1 Scope

18、 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 condition

19、s 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 rega

20、rding 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 calor

21、imeter 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 . 2

22、6 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 BS EN 137712:2017EN 13771-2:2017 (E) 3 European foreword This document (EN 13771-2:2017) has been prepared by Technical Committee CEN/TC 113 “Heat pumps and

23、air conditioning units”, the secretariat of which is held by UNE. 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 March 2018, and conflicting national standards shall be withdrawn at the latest by

24、 March 2018. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 13771-2:2007. The following significant chang

25、es compared to the previous edition have been incorporated in this European Standard: a) alignment of symbols and indexes with EN 13771-1; b) introduction of a new Figure 1 “Condensing unit configurations” and revision of the Figures 2 to 7; c) introduction of the new Clause 4 “Uncertainty of measur

26、ement and test conditions”; d) specification of a detailed test room and setup description to reduce testing uncertainty, aligned with EN 327 and EN 14511-3; e) adoption to transcritical operation and cyclic capacity control. EN 13771 consists of the following parts, under general title Compressors

27、and condensing units for refrigeration Performance testing and test methods: Part 1: Refrigerant compressors Part 2: Condensing units According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Aust

28、ria, 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, Serbia, Slovakia, Slovenia, Spai

29、n, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 137712:2017EN 13771-2:2017 (E) 4 1 Scope 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 det

30、ermination 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 manufacturers works or wherever the instrumentation and load stability for testing to the accuracy required is

31、 available. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced documen

32、t (including any amendments) applies. EN 378-1, Refrigerating systems and heat pumps - Safety and environmental requirements - Part 1: Basic requirements, definitions, classification and selection criteria EN 378-2, Refrigerating systems and heat pumps - Safety and environmental requirements - Part

33、2: Design, construction, testing, marking and documentation ISO 817, Refrigerants Designation and safety classification 3 Terms, definitions and symbols 3.1 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1.1 refrigerating capacity Q condensing u

34、nit product of the refrigerant mass flow and the difference between the specific enthalpy of the refrigerant at the inlet of the condensing unit (Figure 1, point 11) and the specific enthalpy of the fluid at the outlet of the condensing unit (Figure 1, point 12) Note 1 to entry: The outlet (point 12

35、) of condensing unit depends on design (single stage or two stage or internal heat exchangers, see Figure 1 a), b), c) and d). BS EN 137712:2017EN 13771-2:2017 (E) 5 subcritical transcritical a) Single stage condensing units subcritical transcritical b) Two stage / open flash / condensing units subc

36、ritical 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 condensi

37、ng unit outlet 5 refrigerant liquid/fluid at the expansion device inlet Figure 1 Condensing unit configurations BS EN 137712:2017EN 13771-2:2017 (E) 6 3.1.2 specific enthalpy 3.1.2.1 specific enthalpy of the refrigerant at the inlet of the condensing unit specific enthalpy of the refrigerant at pres

38、sure and temperature to the inlet (superheated above the dew point temperature to the stated value) 3.1.2.2 specific enthalpy of the refrigerant fluid at the outlet of the condensing unit specific enthalpy of the refrigerant at pressure and temperature at the outlet 3.1.3 subcooling T12difference be

39、tween 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 conde

40、nsing unit 3.1.5 refrigerant mass flow m refrigerant mass flow at the condensing unit inlet 3.1.6 coefficient of performance COPRratio 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 condit

41、ion 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 ca

42、pacity for compressors with capacity control mechanism Note 1 to entry: On/off cycling of the compressor motor is not considered as capacity control. BS EN 137712:2017EN 13771-2:2017 (E) 7 3.1.10 fluid refrigerant liquid, gas or vapour including the state of appearance close to and above the critica

43、l pressure 3.1.11 oil circulation ratio xoilratio of the measured oil mass flow to the mass flow of the circulating oil/refrigerant mixture 3.1.12 condensing unit combination of one or more compressors, condensers/gas coolers and, where applicable, liquid receivers and the regularly furnished access

44、ories Note 1 to entry: In transcritical operation the condenser operates as gas cooler. 3.1.13 cyclic capacity control control that reduces suction flow in cycles shorter than the test period, without switching off compressor motors 3.2 Symbols For the purposes of this document, the symbols in Table

45、 1 and the indices in Table 2 apply. BS EN 137712:2017EN 13771-2:2017 (E) 8 Table 1 Symbols Symbol Designation SI unit c specific heat capacity J/(kg K) coilspecific heat capacity of oil J/(kg K) COPRcoefficient of performance f electrical frequency Hz F heat leakage factor W/K h specific enthalpy J

46、/kg n compressor speed 1/min P power absorbed W Pmactual compressor power absorbed where the motor is not an integral part of the unit W Pelactual compressor power absorbed where the motor is an integral part of the unit W Pfpower absorbed by the fans and other regularly furnished auxiliaries W Phel

47、ectrical power input to the heater W p absolute pressure MPa m mass flow kg/s V volume flow m3/s T12subcooling K t temperature C tcalmean surface temperature of the calorimeter C ts1inlet temperature of heating or cooling liquid C ts2outlet temperature of heating or cooling liquid C tmidmean of the

48、bubble and dew point temperature of the refrigerant at the condensing unit outlet pressure C tbsbubble temperature of the secondary fluid C txreference temperature C U nominal electrical voltage V v specific volume of refrigerant gas m3/kg density of the refrigerant gas/fluid; indexed for other flui

49、ds kg/m3Qiheat flow to the calorimeter W Q refrigerating capacity W xoiloil circulation ratio BS EN 137712:2017EN 13771-2:2017 (E) 9 Table 2 Indices Index Designation 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 flo