1、BRITISH STANDARDBS EN 13771-2:2007Compressors and condensing units for refrigeration Performance testing and test methods Part 2: Condensing unitsICS 23.140; 27.200g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g4
2、8g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g582010corrigendum February ncorporating INational forewordThis British Standard is the UK implementation of EN 13771-2:2007. Together with BS EN 13215:200 , it supersedes BS 1586:1982 which is withdrawn.The UK participation in its prepara
3、tion was entrusted to Technical Committee RHE/4, Testing of refrigerant compressors.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
4、 correct application.Compliance with a British Standard cannot confer immunity from legal obligations.BS EN 13771-2:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 September 2007 BSI 2010Amendments/corrigenda issued since publicationDa
5、te Comments 28 February 2010 Supersession text addedISBN 978 0 580 63566 30EUROPEAN STANDARDNORME EUROPE NNEEUROP ISCHE NORMEN 13771-2August 2007ICS 23.140; 27.200English VersionCompressors and condensing units for refrigeration -Performance testing and test methods - Part 2: CondensingunitsCompress
6、eurs et units de condensation pour larfrigration - Essais de performance et mthodes dessai -Partie 2: Units de condensationK ltemittel-Verdichter und Verfl ssigungss tze f r dieK lteanwendung - Leistungspr fung und Pr fverfahren -Teil 2: Verfl ssigungss tzeThis European Standard was approved by CEN
7、on 13 July 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be
8、 obtained on application to the CEN 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Man
9、agement Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norw
10、ay, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROP EN DE NORMALISATIONEUROP ISCHES KOMITEE F R NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form
11、and by any means reservedworldwide for CEN national Members.Ref. No. EN 13771-2:2007: E2 Contents Page Foreword4 1 Scope 5 2 Normative references 5 3 Terms, definitions and symbols.5 3.1 Terms and definitions .5 3.2 Symbols 6 3.3 Refrigerant circuit state points.8 4 General requirements9 4.1 Test eq
12、uipment 9 4.2 Calculation methods .9 4.2.1 Principle9 4.2.2 Specific enthalpy .9 4.2.3 Refrigerant mass flow .9 4.2.4 Power absorbed.9 4.2.5 Basic equations .9 4.3 Requirements for the selection of test methods 10 4.4 Test procedure.10 4.4.1 General10 4.4.2 Steady working conditions .10 4.4.3 Record
13、ing of measured data 10 4.5 Pressure and temperature measuring points .11 4.6 Oil circulation.11 4.7 Refrigerant composition 11 4.8 Calibration and requirements regarding measurement uncertainty11 4.8.1 Calibration of calorimeters for methods A, B and C11 4.8.2 Determination of the refrigerating cap
14、acity 12 4.8.3 Determination of the power absorbed by the condensing unit 12 4.8.4 Measuring instruments .12 4.9 Source of refrigerant data.13 4.10 Allowable deviations from the basic test conditions.13 4.11 Additional information 14 5 Test methods14 5.1 General14 5.2 List of test methods.14 5.2.1 C
15、alorimetric methods14 5.2.2 Flow meter methods15 5.3 Method A: secondary fluid calorimeter on the suction side .15 5.3.1 Description .15 5.3.2 Calibration 15 5.3.3 Test procedure.16 5.3.4 Requirements.16 5.3.5 Determination of refrigerant mass flow.16 5.4 Method B: dry system refrigerant calorimeter
16、 on the suction side16 5.4.1 Description .16 5.4.2 Calibration 17 5.4.3 Test procedure.17 5.4.4 Requirements.17 5.4.5 Determination of refrigerant mass flow.17 5.5 Method C: water-cooled condenser on the discharge side 18 5.5.1 Description .18 5.5.2 Calibration 18 BS EN 13771-2:20073 5.5.3 Test proc
17、edure.18 5.5.4 Requirements.19 5.5.5 Determination of refrigerant mass flow 19 5.6 Method D: refrigerant vapour flow meter on the suction side19 5.6.1 Description.19 5.6.2 Test procedure.19 5.6.3 Requirements.19 5.6.4 Determination of refrigerant mass flow 20 5.7 Method E: refrigerant flow meter in
18、the liquid line 20 5.7.1 Description.20 5.7.2 Test procedure.20 5.7.3 Requirements.21 5.7.4 Determination of the refrigerant mass flow21 6 Determination of the power absorbed by the condensing unit21 6.1 General .21 6.1.1 Introduction21 6.1.2 Measurement for condensing units where the motor is not a
19、n integral part of the unit.21 6.1.3 Measurement for condensing units where the motor is an integral part of the condensing unit 21 6.1.4 Measurement of the power absorbed by the auxiliary components22 6.2 Calculation .22 7 Test report22 7.1 General .22 7.2 General information in the test report.22
20、7.3 Basic data.22 7.4 Test results 23 7.5 Additional information 23 Bibliography25 BS EN 13771-2:20074 Foreword This document (EN 13771-2:2007) has been prepared by Technical Committee CEN/TC 113 “Heat pumps and air conditioning units”, the secretariat of which is held by AENOR. This European Standa
21、rd shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 2008 , and conflicting national standards shall be withdrawn at the latest by February 2008. Attention is drawn to the possibility that some of the elements of
22、 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. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European
23、Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United King
24、dom. BS EN 13771-2:20075 1 Scope This part of EN 13771 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
25、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 available. The type of measuring instrument and the allowable uncerta
26、inties within which measurements shall be made are listed in Table 2. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced d
27、ocument (including any amendments) applies. EN 378-1:2000, 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 Pa
28、rt 2: Design, construction, testing, marking and documentation EN ISO 5167-1, Measurement of fluid flow by means of pressure differential devices inserted in circular cross- section conduits running full - Part 1: General principles and requirements (ISO 5167-1:2003) ISO 817, Refrigerants - Designat
29、ion system ISO 5168, Measurement of fluid flow - Procedures for the evaluation of uncertainties 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 0product of the refrigerant mass flow
30、and the difference between the specific enthalpy of the refrigerant at the inlet of the condensing unit and that at the outlet of the condensing unit. The refrigerant at the unit inlet is superheated above the suction dew point temperature to the stated value. The liquid is at a pressure correspondi
31、ng to the outlet of the condensing unit 3.1.2 power absorbed 3.1.2.1 power absorbed by the condensing unit where the motor is an integral part of the unit, Pcm electrical power input at the compressor motor terminals plus the power to all other devices (e.g. fan motor) forming an integral part of th
32、e condensing unit BS EN 13771-2:20076 3.1.2.2 power absorbed by the condensing unit where the motor is not supplied as an integral part in the unit, Pcs electrically power input at the compressor shaft plus the power to all other devices (e.g. fan motor) forming an integral part of the condensing un
33、it 3.1.3 refrigerant mass flow qm refrigerant mass flow at the condensing unit inlet 3.1.4 coefficient of performance 3.1.4.1 coefficient of performance COPrmratio of the refrigerating capacity to the power absorbed as defined in 3.1.1 and 3.1.2.1 3.1.4.2 coefficient of performance COPrsratio of the
34、 refrigerating capacity to the power absorbed as defined in 3.1.1 and 3.1.2.2 NOTE All the above are at the basic test condition. 3.1.5 oil circulation in the refrigerating system xoilratio of the measured oil mass flow to the mass flow of the circulating oil/refrigerant mixture 3.1.6 condensing uni
35、t factory assembled unit comprised of refrigeration compressor and motor, condenser and any necessary associated ancillaries 3.2 Symbols For the purposes of this document, the symbols found in Table 1 apply. BS EN 13771-2:20077 Table 1 Symbols Symbol Designation SI unit c Specific heat capacity of l
36、iquid J/(kg K) coilSpecific heat capacity of oil J/(kg K) COPrmCoefficient of performance as defined in 3.1.4.1 - COPrsCoefficient of performance as defined in 3.1.4.2 - f Nominal electrical frequency Hz faActual electrical frequency Hz F Heat leakage factor W/K hl 2Specific enthalpy of liquid refri
37、gerant at bubble point corresponding to the pressure at the compressor outlet according to the basic test conditions J/kg hlc4Specific enthalpy of liquid refrigerant at the outlet of the condensing unit J/kg hl 5Specific enthalpy of liquid refrigerant at the inlet in the expansion device J/kg hg c 1
38、Specific enthalpy of the refrigerant vapour at the condensing unit inlet at the basic test conditions J/kg hg 3Specific enthalpy of the refrigerant vapour at the inlet of the condenser J/kg hg 6Specific enthalpy of the refrigerant vapour at the outlet of the calorimeter J/kg n Nominal compressor spe
39、ed 1/min naActual compressor speed 1/min PcPower absorbed by the unit at the basic test conditions W PaActual power absorbed by the compressor W PcmPower absorbed by the condensing unit (for motor compressors) W PcsPower absorbed by the condensing unit (for externally driven compressors) W PFPower a
40、bsorbed by all other auxiliary components (fans, etc.) W pgc 1Absolute pressure, condensing unit inlet MPa pg 2Absolute pressure, compressor outlet MPa pg 3Pressure of the refrigerant vapour entering the condenser MPa pg 6Pressure of the refrigerant vapour of the evaporator outlet MPa plc4Pressure o
41、f the refrigerant liquid leaving the condensing unit MPa pl 5Pressure of the refrigerant liquid entering the expansion device MPa psAbsolute pressure of the secondary fluid MPa qmRefrigerant mass flow as determined by the test kg/s qm 0Refrigerant mass flow at the basic test conditions kg/s qmfFluid
42、 mass flow kg/s qmxMass flow of liquid refrigerant/oil mixture kg/s qvRefrigerant volume flow m3/s qvxVolume flow of refrigerant/oil mixture m3/s taAmbient temperature C tA inAir inlet temperature at air-cooled condenser C tF inFluid inlet temperature at evaporator / water-cooled condenser C tF outF
43、luid outlet temperature at evaporator / water-cooled condenser C tcMean surface temperature of the calorimeter at the basic test conditions C tgaActual temperature at the condensing unit inlet C tgc 1Refrigerant vapour temperature at the condensing unit inlet at the basic test conditions C tg 3Tempe
44、rature of the refrigerant vapour entering condenser C tg 6Temperature of the refrigerant vapour at the evaporator outlet C BS EN 13771-2:20078 tl 2Saturation temperature of the liquid refrigerant corresponding to the pressure at the compressor outlet C tlc 4Temperature of the refrigerant liquid leav
45、ing the condensing unit C tl 5Temperature of the refrigerant liquid entering the expansion device C trThe mean of the bubble and dew point temperature of the refrigerant C tsSaturation temperature of the secondary fluid C txReference temperature C U Nominal electrical voltage V xoilOil circulation i
46、n the refrigerating system, expressed in kilogram per kilogram of mixture kg/kg vgaActual specific volume of refrigerant vapour at the condensing unit inlet m3/kg vg c1Specific volume of refrigerant vapour at the condensing unit inlet at the basic test conditions m3/kg mDensity of refrigerant corres
47、ponding to pressure and temperature at which the flow rate is measured kg/m3 iHeat flow to the calorimeter W nElectrical power for the heater W 0Refrigerating capacity of the condensing unit at the basic test conditions W 3.3 Refrigerant circuit state points Figure 1b) shows the state of the refrige
48、rant as it flows through the refrigerating circuit shown in Figure 1a). a) Circuit diagram b) Pressure vs enthalpy diagram Key 1 Condenser (including any receiver and/or sub-cooler forming an integral part of the unit) 2 Expansion device 3 Compressor 4 Evaporator Figure 1 Refrigerant circuit BS EN 1
49、3771-2:20079 4 General requirements 4.1 Test equipment All equipment shall comply with the requirements of EN 378-2. 4.2 Calculation methods 4.2.1 Principle The determination of the refrigerating capacity of a condensing unit at the basic test conditions comprises: evaluation of the actual mass flow of refrigerant at the condensing unit inlet (qm) when operating within the limits allowed to the basic test conditions in Table 3; correction of this mass flow to that, at the basic test conditions using the ratio of the actual spe
