1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Classification of environmental conditionsPart 2-4: Environmental conditions appearing in nature - Solar radiation and temperatureBS EN IEC 60721-2-4:2018EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN IEC 60721-2-
2、4 August 2018 ICS 19.040 English Version Classification of environmental conditions - Part 2-4: Environmental conditions appearing in nature - Solar radiation and temperature (IEC 60721-2-4:2018) Classification des conditions denvironnement - Partie 2-4: Conditions denvironnement prsentes dans la na
3、ture - Rayonnement solaire et temprature (IEC 60721-2-4:2018) Klassifizierung von Umgebungsbedingungen - Teil 2-4: Natrliche Umgebungsbedingungen - Sonnenstrahlung und Temperatur (IEC 60721-2-4:2018) This European Standard was approved by CENELEC on 2018-07-27. CENELEC members are bound to comply wi
4、th 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 concerning such national standards may be obtained on application to the CEN-CENELEC Mana
5、gement Centre or to any CENELEC 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 CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
6、 same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
7、 Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Ele
8、ktrotechnische Normung CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN IEC 60721-2-4:2018 E National forewordThis British Standard is the UK implementation of
9、 EN IEC 6072124:2018. It is identical to IEC 6072124:2018. It supersedes BS 75272.4:1991, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee GEL/104, Environmental conditions, classification and testing.A list of organizations represented on this committe
10、e 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 2018 Published by BSI Standards Limited 2018ISBN 978 0 580 89484 8ICS 19.040Comp
11、liance 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 31 August 2018.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN IEC 6072124:2018
12、EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN IEC 60721-2-4 August 2018 ICS 19.040 English Version Classification of environmental conditions - Part 2-4: Environmental conditions appearing in nature - Solar radiation and temperature (IEC 60721-2-4:2018) Classification des conditions denvironn
13、ement - Partie 2-4: Conditions denvironnement prsentes dans la nature - Rayonnement solaire et temprature (IEC 60721-2-4:2018) Klassifizierung von Umgebungsbedingungen - Teil 2-4: Natrliche Umgebungsbedingungen - Sonnenstrahlung und Temperatur (IEC 60721-2-4:2018) This European Standard was approved
14、 by CENELEC on 2018-07-27. CENELEC 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 concerning such national
15、 standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC 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 CENELEC member into its own l
16、anguage and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, F
17、rance, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Eur
18、open de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN IEC 60721-2-4:2018 E B
19、S EN IEC 6072124:2018EN IEC 60721-2-4:2018 (E) 2 European foreword The text of document 104/800/FDIS, future edition 2 of IEC 60721-2-4, prepared by IEC/TC 104 “Environmental conditions, classification and methods of test“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN
20、IEC 60721-2-4:2018. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2019-04-27 latest date by which the national standards conflicting with the document have to be withdr
21、awn (dow) 2021-07-27 Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 60721-2-4:2018
22、 was approved by CENELEC as a European Standard without any modification. BS EN IEC 6072124:2018 2 IEC 60721-2-4:2018 IEC 2018 CONTENTS FOREWORD . 3 1 Scope 5 2 Normative references 5 3 Terms and definitions 5 4 General . 5 5 Solar radiation physics 6 6 Levels of global radiation . 7 6.1 Maximum lev
23、els 7 6.2 Mean monthly and annual global solar radiation 7 6.3 Simultaneous values of maximum air temperatures and solar radiation . 8 6.4 World distribution of daily global irradiation . 8 7 Minimum levels of atmospheric radiation at night . 8 Annex A (informative) World distribution of daily globa
24、l irradiation . 10 Bibliography 15 Figure 1 Spectra of electromagnetic radiation from the Sun and the surface of the Earth . 9 Figure A.1 Mean relative global irradiation for the month of June (in %) . 12 Figure A.2 Mean relative global irradiation for the month of December (in %) . 13 Figure A.3 Me
25、an relative global irradiation for the year (in %) 14 Table 1 Typical peak values of global irradiance (in W/m2from a cloudless sky) . 7 Table A.1 Mean daily extra-terrestrial global irradiation (kWh/m2) 11 BS EN IEC 6072124:2018IEC 60721-2-4:2018 IEC 2018 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION
26、 _ CLASSIFICATION OF ENVIRONMENTAL CONDITIONS Part 2-4: Environmental conditions appearing in nature Solar radiation and temperature FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IE
27、C National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
28、 Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-g
29、overnmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of I
30、EC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publications have the form of recommendations for international use and are acc
31、epted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote internati
32、onal uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the l
33、atter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users sh
34、ould ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other da
35、mage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use o
36、f the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rig
37、hts. International Standard IEC 60721-2-4 has been prepared by IEC technical committee 104: Environmental conditions, classification and methods of test. This second edition cancels and replaces the first edition published in 1987 and Amendment 1:1988. This edition constitutes a technical revision.
38、This edition includes the following significant technical changes with respect to the previous edition: a) Figures updated including the addition of global irradiation information, b) Format updated. BS EN IEC 6072124:2018 4 IEC 60721-2-4:2018 IEC 2018 The text of this International Standard is base
39、d on the following documents: FDIS Report on voting 104/800/FDIS 104/803/RVD Full information on the voting for the approval of this International Standard can be found in the report on voting indicated in the above table. This document has been drafted in accordance with the ISO/IEC Directives, Par
40、t 2. A list of all parts in the IEC 60721 series, published under the general title Classification of environmental conditions, can be found on the IEC website. The committee has decided that the contents of this document will remain unchanged until the stability date indicated on the IEC website un
41、der “http:/webstore.iec.ch“ in the data related to the specific document. At this date, the document will be reconfirmed, withdrawn, replaced by a revised edition, or amended. BS EN IEC 6072124:2018IEC 60721-2-4:2018 IEC 2018 5 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS Part 2-4: Environmental condi
42、tions appearing in nature Solar radiation and temperature 1 Scope This part of IEC 60721 presents a broad division into types of solar radiation areas. It is intended to be used as part of the background material when selecting appropriate severities of solar radiation for product applications. All
43、types of geographical areas are covered, except areas with altitudes above 5 000 m. This document also serves to define limiting severities of solar radiation to which products are liable to be exposed during transportation, storage and use. 2 Normative references There are no normative references i
44、n this document. 3 Terms and definitions No terms and definitions are listed in this document. ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online browsing platform: available at ht
45、tp:/www.iso.org/obp 4 General Solar radiation can affect products primarily by the heating of material and their environment or by photochemical degradation of material. Solar radiation, especially its ultraviolet content, causes photochemical degradation of most organic materials. Elasticity and pl
46、asticity of certain rubber compounds and plastic materials are affected. Optical glass may become opaque. Solar radiation bleaches out colours in paints, textiles, paper, etc. This can be of importance, for example for the colour-coding of components. The heating of material is a consequence of expo
47、sure to solar radiation. The presentation of severities of solar radiation is therefore related to the power density radiated towards a surface, or irradiance, expressed in W/m2. An object subjected to solar radiation will attain a temperature that depends primarily on the surrounding air temperatur
48、e, the energy radiated from the Sun, and the incidence angle of the radiation on the object. Other factors, for example wind and heat conduction to mountings, can be of importance. In addition, the absorptance sof the surface for the solar spectrum is of importance. BS EN IEC 6072124:2018 6 IEC 6072
49、1-2-4:2018 IEC 2018 An artificial air temperature tsmay be defined, which, under steady-state conditions, results in the same surface temperature of an object as the combination of the actual air temperature tuand the solar radiation of the irradiance E. An approximate value can be obtained from the following equation: ysushEtt+=The coefficient hyis the heat transfer coefficient for the surface, in W/(m2 C). It includes thermal radiation to the surroundings, hea
