BS EN 12900-2005 制冷压缩机.厂商提供的性能数据的额定条件、公差和图示.pdf

BRITISH STANDARD BS EN 12900:2005 Refrigerant compressors Rating conditions, tolerances and presentation of manufacturers performance data The European Standard EN 12900:2005 has the status of a British Standard ICS 23.140; 27.200 BS EN 12900:2005 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 15 February 2006 © BSI 15 February 2006 ISBN 0 580 46965 4 National foreword This British Standard is the official English language version of EN 12900:2005. It supersedes BS EN 12900:1999 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee RHE/4, Testing of refrigerant compressors, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 10, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. 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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of an identical text or by endorsement, at the latest by April 2006, and conflicting national standards shall be withdrawn at the latest by April 2006. This European Standard supersedes EN 12900:1999. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following coun- tries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Esto- nia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 12900:2005 (E) 4 1 Scope This European Standard specifies the rating conditions, tolerances and the method of presenting manufacturers data for positive displacement refrigerant compressors. These include single stage compressors and single and two stage compressors using a means of liquid subcooling. This is required so that a comparison of different refrig- erant compressors can be made. The data relate to the refrigerating capacity and power absorbed and include cor- rection factors and part-load performance where applicable. 2 Normative references The following referenced documents are indispensable for the application of this European Standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (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 13771-1, Compressors and condensing units for refrigeration Performance testing and test methods Part 1: Refrigerant compressors ISO 817, Refrigerants Designation system 3 Terms and definitions For the purposes of this European Standard, the terms and definitions of EN 378-1:2000 and the following apply. 3.1 positive displacement compressor compressor in which compression is obtained by changing the internal volume of the compression chamber, see 3.4.6 of EN 378-1:2000 3.2 refrigerating capacity product of the mass flow of refrigerant through the compressor and the difference between the specific enthalpy of the refrigerant at the compressor inlet and the specific enthalpy of saturated liquid NOTE The refrigerant at the compressor inlet is superheated above the suction dew point temperature to the stated value (see Table 1). The saturated liquid is at a pressure corresponding to the compressor discharge pressure. 3.3 subcooling difference between the bubble point temperature of the refrigerant corresponding to the compressor discharge pressure and the temperature of the liquid refrigerant below the bubble point 3.4 superheat difference between the dew point temperature of the refrigerant corresponding to the compressor suction pressure and the suction vapour temperature of the refrigerant at the compressor inlet 3.5 power absorbed for externally driven compressors: the power at the compressor shaft; for motor compressors: the electrical power input at the motor terminals 3.6 coefficient of performance, COPr ratio of refrigerating capacity to the power absorbed, expressed in Watt/Watt EN 12900:2005 (E) 5 4 Parameters for the presentation of performance data The parameters as shown in Table 1a Table 1 d shall be used for the presentation of the performance data. Table 1 a Parameters for the presentation of performance data with compressors used in standard applications Parameters Refrigerant Suction vapour temperature (°C) or superheat (K) at the compressor inlet Ambient temperature around the compressor Compressor application 32 °C Household and similar refrigerators/freezers Halocarbons and hydrocarbons including refrigerant blends 20 °C or 10 K Other applications R-717 5 K Any application using ammonia Other refrigerants As appropriate, to be clearly speci- fied in performance data 32 °C The refrigerating capacity shall not allow for any subcooling. Table 1 b Parameters for the presentation of performance data with compressors using a specific means of factory assembled or factory specified liquid subcooler Refrigerant Suction vapour temperature (°C) or superheat (K) at the compressor inlet Ambient temperature around the compressor Compressor application Halocarbons and hydro- carbons including refrig- erant blends 20 °C or 10 K R-717 (NH3) 5 K Other refrigerants As appropriate, to be clearly specified in performance data 32 °C Any application with factory assembled or factory specified liquid subcooler NOTE Liquid entering the subcooler is at saturated (bubble) temperature equivalent to the refrigerant pressure at the compressor outlet. The refrigerating capacity includes the subcooling provided by the subcooler. EN 12900:2005 (E) 6 Table 1 c Parameters for the presentation of performance data with compressors using an individually selected liquid subcooler Refrigerant Suction vapour temperature (°C) or superheat (K) at the compressor inlet Liquid subcooling (K) or temperature (°C) Saturated intermediate (dew) temperature (°C) or pressure (bar) Ambient temperature around the compressor Compressor application Halocarbons and hydrocar- bons including refrigerant blends 20 °C or 10 K R-717 (NH3) 5 K Other refrigerants As appropriate, to be clearly specified in performance data 5 K above saturated intermediate tem- perature to be specified with reference to evaporating and condensing tem- peratures 32 °C Any application with individually selected liquid subcooler NOTE Liquid entering the subcooler is at saturated (bubble) temperature equivalent to the refrigerant pressure at the compressor outlet. The refrigerating capacity includes the subcooling provided by the subcooler. Table 1 d Parameters for the presentation of performance data with compressors using an open flash liquid subcooler Refrigerant Suction vapour temperature (°C) or superheat (K) at the compressor inlet Liquid subcooling (K) or temperature (°C) Saturated intermediate temperature (°C) or pressure (bar) Ambient temperature around the compressor Compressor application Halocarbons and hydrocar- bons including refrigerant blends 20 °C or 10 K R-717 (NH3) 5 K Other refrigerants As appropriate, to be clearly specified in performance data equivalent to saturated interme- diate temperature to be specified with reference to evaporating and condensing tem- peratures 32 °C Any application with open flash liquid subcooler NOTE Liquid entering the subcooler is at saturated (bubble) temperature equivalent to the refrigerant pressure at the compressor outlet. The refrigerating capacity includes the subcooling provided by the subcooler. EN 12900:2005 (E) 7 5 General requirements The performance data of a refrigerant compressor shall be presented in either tabular or graphical form as shown in 6.2 and in addition in polynomial form as shown in 6.3. Any operating point published by the manufacturer and falling within the envelope shown in Figure 1 shall comply with the tolerances defined in Table 3. The performance of the compressor at the standard reference points in table 2 shall also be reported. To calculate the performance at other suction vapour temperatures or superheat and part-load, correction factors shall be given as shown in clause 9. Refrigerants shall be designated in accordance with ISO 817. The source from which the thermodynamic properties are taken shall be stated. NOTE 1 It is recommended that an example illustrating the use of the performance data and the correction factors should be given. NOTE 2 Other data such as the swept volume, number of cylinders and speed range may also be shown. 6 Performance data 6.1 General 6.1.1 Published performance shall be based on data obtained from tests performed in accordance with EN 13771-1. If an oil separator is required to reach the performance, then this shall be indicated. 6.1.2 The performance data shall be presented for: open compressors at the rated speed; motor compressors at the rated voltage and frequency. 6.2 Tabular or graphical form The performance data to be given, in either tabular or graphical form, shall comprise: a) refrigerating capacity, in values able to be read to an accuracy of 2 %; b) absorbed power, in values able to be read to an accuracy of 2 %; c) evaporating temperatures at suction dew point with intervals not greater than 5 K; d) condensing temperatures at discharge dew point with intervals not greater than 10 K; e) for compressors using a specific means of liquid subcooling, the temperature of the liquid leaving the sub- cooler must be specified. 6.3 Polynomial form 6.3.1 The polynomial equation shall be a third degree equation utilizing ten coefficients as follows: X = C1 + C2 x (S) + C3 x (D) + C4 x (S)2 + C5 x (S x D) + C6 x(D2) + C7 x (S3) + C8 x (D x S2) + C9 x (S x D2) + C10 x (D3) (1) where: X is the refrigerating capacity, in Watts, absorbed power, in Watts, or mass flow in kilograms per second; S is the evaporating temperature at suction dew point, in degree Celsius; D is the condensing temperature at discharge dew point, in degree Celsius; C is a coefficient. EN 12900:2005 (E) 8 6.3.2 The polynomial equation above shall not be used to extrapolate beyond the range of the tabulated data. Interpolation for different superheats is allowed, if the polynoms for different superheat conditions are given. 7 Standard reference points The standard reference points shall be in accordance with Table 2. Table 2 Standard reference points Compressor applications Reference points High evaporating temperature Medium evaporating temperature Low evaporating temperature Household and similar refrigerators/ freezers Evaporating temperature (°C) at suction dew point + 5 10 35 25 Condensing temperature (°C) at discharge dew point + 50 + 45 + 40 + 55 Suction vapour temperature (°C) or superheat (K) + 20 10 or 5a + 20 10 or 5a + 20 10 or 5a + 32 Subcooling (K) 0 0 0 0 a For R-717 8 Tolerances Component differences during production may result in deviations from the manufacturer's stated performance. To comply with this European Standard the performance of tolerances of any individual compressor shall be defined as follows: Refrigerating capacity or mass flow and COPr shall not be lower than shown in Table 3. Power absorbed shall not be more than the percentage shown in Table 3. Table 3 Actual performance in relation to published data Compressor applications High evaporating temperature H Medium evaporating temperature M Low evaporating temperature L Househ