1、BSI Standards PublicationBS EN ISO 22975-3:2014Solar energy Collectorcomponents and materialsPart 3: Absorber surface durabilityBS EN ISO 22975-3:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO22975-3:2014.The UK participation in its preparation was ent
2、rusted to TechnicalCommittee RHE/25, Solar Heating.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British St
3、andards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 75652 8ICS 27.160Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 August 2014.Amen
4、dments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 22975-3 July 2014 ICS 27.160 English Version Solar energy - Collector components and materials - Part 3: Absorber surface durability (ISO 22975-3:2014) Energie solaire - Composants et matriaux d
5、u collecteur - Partie 3: Durabilit de la surface de labsorbeur (ISO 22975-3:2014) Thermische Solaranlagen und ihre Bauteile - Kollektoren - Teil 3: Qualifizierung der Bestndigkeit von Solarabsorberflchen (ISO 22975-3:2014) This European Standard was approved by CEN on 7 May 2014. CEN members are bou
6、nd 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 standards may be obtained on application to the C
7、EN-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 its own language and notified to the CEN-CENELEC Management Centre
8、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, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
9、Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, 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 B
10、russels 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 22975-3:2014 EBS EN ISO 22975-3:2014EN ISO 22975-3:2014 (E) 3 Foreword The text of ISO 22975-3:2014 has been prepared by Technical Committee ISO/TC 180 “Solar energy”
11、 of the International Organization for Standardization (ISO) and has been taken over as EN ISO 22975-3:2014 by Technical Committee CEN/TC 312 “Thermal solar systems and components” the secretariat of which is held by ELOT. This European Standard shall be given the status of a national standard, eith
12、er by publication of an identical text or by endorsement, at the latest by January 2015, and conflicting national standards shall be withdrawn at the latest by January 2015. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/
13、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 Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
14、 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
15、 Endorsement notice The text of ISO 22975-3:2014 has been approved by CEN as EN ISO 22975-3:2014 without any modification. BS EN ISO 22975-3:2014ISO 22975-3:2014(E) ISO 2014 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 R
16、equirements and classification . 25 Test methods for assessing material properties as measure of absorber performance . 35.1 Sampling and preparation of test specimens . 35.2 Sample conditioning. 45.3 Solar absorptance . 45.4 Thermal emittance 45.5 Adhesion . 46 Tests for assessing the thermal stabi
17、lity of absorber surfaces 46.1 Principle 46.2 Apparatus 56.3 Procedure for execution of high temperature tests. 66.4 Qualification procedure . 77 Tests for determining the resistance to condensed water of absorber surfaces . 77.1 Principle 77.2 Apparatus 87.3 Procedure for execution of constant cond
18、ensation tests . 97.4 Qualification procedure 108 Test for determining absorber surface corrosion resistance to high humidity air containing sulfur dioxide108.1 Principle . 108.2 Apparatus . 118.3 Reference test specimen 128.4 Procedure for execution of corrosion test in high humidity air containing
19、 sulfur dioxide 128.5 Determination of shortest acceptable failure times in test by use of reference test specimens 138.6 Qualification procedure 139 Test report 14Annex A (normative) Procedure for determination of solar absorption and thermal emittance of absorber surfaces .15Annex B (normative) Te
20、mperature and failure time characteristics in assessment of thermal stability of absorber surface .19Annex C (normative) Temperature/condensation and failure time characteristics together with qualification scheme in assessment of resistance to condensed water of absorber surface 25Annex D (informat
21、ive) Suitable designs for test apparatus to be used in the qualification testing of solar absorber surfaces 28Bibliography .30BS EN ISO 22975-3:2014ISO 22975-3:2014(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member b
22、odies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental a
23、nd non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are d
24、escribed in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). Attention is dra
25、wn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on
26、the ISO list of patent declarations received (see www.iso.org/patents). Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessme
27、nt, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 180, Solar energy.ISO 22975 consists of the following parts, under the gener
28、al title Solar energy Collector components and materials: Part 3: Absorber surface durabilityThe following parts are under preparation: Part 1: Evacuated tubes Durability and performance Part 2: Heat-pipe for solar thermal application Durability and performanceiv ISO 2014 All rights reservedBS EN IS
29、O 22975-3:2014ISO 22975-3:2014(E)IntroductionTo effectively select, use and maintain a material in a given application, its degradation under service conditions must be predicted prior to use. Preferably, the durability of the material should be expressed quantitatively in terms of an expected servi
30、ce life. Durability in this case is the ability of a material to withstand deterioration caused by external factors in the environment, which may influence the performance of the material under service conditions. Service life is defined as the period of time after installation during which specific
31、 material properties important for the performance of the material meet or exceed minimum acceptable values.The service life of a material is, thus, not solely dependent on its physical and chemical properties, but also on its performance requirement in the application considered, and on the externa
32、l environmental factors, which influence performance under service conditions. In design work, the important question is if a specific material can be expected to have a service life longer than a certain value, the so-called design service life; the latter dictated by life cost considerations takin
33、g into account the total system. Service life assessment may be based on feed-back data from practice or on results from so-called qualification or acceptance durability tests.The present recommended qualification procedure for solar absorber surface durability is based on the conduct of a series of
34、 short-term durability tests. During a test the optical performance of the absorber surface tested is determined by measuring its solar absorptance and thermal emittance. From the loss in optical performance of the absorber surface, its failure time in the test performed is assessed and compared wit
35、h the shortest acceptable failure time set by the design service life of the absorber. Design service life, performance requirement defining failure time in terms of loss in optical performance, classification of type and levels of environmental stress are set under the assumption, that the absorber
36、 surface tested will be installed in a vented flat plate solar collector for use in domestic hot water systems and combisystems or under similar operating conditions.The recommended qualification procedure may favourably be used in the development and validation of new kinds of absorber surfaces. Fr
37、om the results of tests, it can be concluded whether it is likely that an absorber surface tested may meet the requirement for an acceptable service life also in practice. The recommended durability testing procedure has proved to give results in fairly good agreement, both qualitatively and quantit
38、atively, with what has actually been observed on absorber surfaces tested for longer time periods in solar collectors working under conditions corresponding to that in a typical domestic solar hot water system or combisystem. Nevertheless, if the tested absorber could not be qualified by present pro
39、cedure, a more comprehensive investigation on durability is recommended and can still lead to a qualification.The present procedure consists of three parts to test the absorber with respect to its stability against high temperature, against high humidity and condensation and against corrosion caused
40、 by atmospheric sulfur dioxide. The three parts are independent and can be assessed individually. ISO 2014 All rights reserved vBS EN ISO 22975-3:2014BS EN ISO 22975-3:2014Solar energy Collector components and materials Part 3: Absorber surface durability1 ScopeThis part of ISO 22975 is applicable t
41、o the determination of the long term behaviour and service life of selective solar absorbers for use in vented flat plate solar collectors working under conditions corresponding to that in a typical solar domestic hot water system or combisystem.This part of ISO 22975 specifies a failure criterion o
42、f a solar absorber based on changes in optical performance of the absorber. The optical properties of interest are solar absorptance and thermal emittance.This part of ISO 22975 specifies durability testing procedures focused on resistance to high temperatures and condensation of water on the absorb
43、er surface as well as high humidity in the presence of sulfur dioxide.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated reference
44、s, the latest edition of the referenced document (including any amendments) applies.ISO 4624, Paints and varnishes Pull-off test for adhesionISO 8407, Corrosion of metals and alloys Removal of corrosion products from corrosion test specimensISO 9050, Glass in building Determination of light transmit
45、tance, solar direct transmittance, total solar energy transmittance, ultraviolet transmittance and related glazing factorsISO 10062, Corrosion tests in artificial atmosphere at very low concentrations of polluting gas(es)3 Terms and definitionsFor the purposes of this document, the following terms a
46、nd definitions apply.3.1design service lifetime period of exposure under service conditions after installation during which the absorber surface is expected to meet the performance requirement3.2failure timetime period of exposure in the test at which the performance requirement limit is reached3.3s
47、olar absorptance, sfraction of solar radiation energy absorbed by an absorber surfaceINTERNATIONAL STANDARD ISO 22975-3:2014(E) ISO 2014 All rights reserved 1BS EN ISO 22975-3:2014ISO 22975-3:2014(E)3.4thermal emittance, ratio between the energy per unit area radiated by a surface at a given tempera
48、ture and the corresponding energy radiated by a perfect black body at the same temperature3.5performance criterion functionPCchange in performance of an absorber surface in terms of changes in solar absorptance and thermal emittance4 Requirements and classification4.1 For classification of the durab
49、ility of the absorber surface, the following performance requirement shall apply:PCs= +050005, (1)wheresis the change in the solar absorptance defined ass= s,t s,i(2)with s,tequal to the value of the solar absorptance at the actual time of the test or at service, andwith s,iequal to the initial value of solar absorptancewhere is the change in the thermal emittance = t i(3)with tequal to the value of the thermal emittance at the actual time of the test or at service andwith iequal to the initial value of thermal emitta
