1、October 2014Translation by DIN-Sprachendienst.English price group 16No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS
2、 27.160!%;w+“2248408www.din.deDDIN EN ISO 22975-3Solar energy Collector components and materials Part 3: Absorber surface durability (ISO 22975-3:2014);English version EN ISO 22975-3:2014,English translation of DIN EN ISO 22975-3:2014-10Solarenergie Kollektorbauteile und Materialien Teil 3: Bestndig
3、keit von Solarabsorberflchen (ISO 22975-3:2014);Englische Fassung EN ISO 22975-3:2014,Englische bersetzung von DIN EN ISO 22975-3:2014-10nergie solaire Composants et matriaux du collecteur Partie 3: Durabilit de la surface de labsorbeur (ISO 22975-3:2014);Version anglaise EN ISO 22975-3:2014,Traduct
4、ion anglaise de DIN EN ISO 22975-3:2014-10www.beuth.deIn case of doubt, the German-language original shall be considered authoritative.Document comprises 36 pages09.14 DIN EN ISO 22975-3:2014-10 2 A comma is used as the decimal marker. National foreword This document (EN ISO 22975-3:2014) has been p
5、repared by Technical Committee ISO/TC 180 “Solar energy” in collaboration with Technical Committee CEN/TC 312 “Thermal solar systems and components” (Secretariat: ELOT, Greece). The responsible German body involved in its preparation was the DIN-Normenausschuss Heiz- und Raumluft-technik (DIN Standa
6、rds Committee Heating and Ventilation Technology), Working Committee NA 041-01-56 AA Solaranlagen (SpA CEN/TC 312 und ISO/TC 180). The DIN Standards corresponding to the International Standards referred to in this document are as follows: ISO 2409 DIN EN ISO 2409 ISO 2819 DIN EN ISO 2819 ISO 4624 DI
7、N EN ISO 4624 ISO 8407 DIN EN ISO 8407 ISO 9226 DIN EN ISO 9226 ISO 10062 DIN EN ISO 10062 National Annex NA (informative) Bibliography DIN EN ISO 2409, Paints and varnishes Cross-cut test DIN EN ISO 2819, Metallic coatings on metallic substrates Electrodeposited and chemically deposited coatings Re
8、view of methods available for testing adhesion DIN EN ISO 4624, Paints and varnishes Pull-off test for adhesion DIN EN ISO 8407, Corrosion of metals and alloys Removal of corrosion products from corrosion test speci-mens DIN EN ISO 9226, Corrosion of metals and alloys Corrosivity of atmospheres Dete
9、rmination of corrosion rate of standard specimens for the evaluation of corrosivity DIN EN ISO 10062, Corrosion tests in artificial atmosphere at very low concentrations of polluting gas(es) EN ISO 22975-3July 2014 ICS 27.160 English Version Solar energy - Collector components and materials - Part 3
10、: Absorber surface durability (ISO 22975-3:2014) nergie solaire - Composants et matriaux du collecteur - Partie 3: Durabilit de la surface de labsorbeur(ISO 22975-3:2014) Solarenergie - Kollektorbauteile und Materialien -Teil 3: Bestndigkeit von Solarabsorberflchen(ISO 22975-3:2014)This European Sta
11、ndard was approved by CEN on 7 May 2014. 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 concerning suc
12、h 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 its own
13、 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, Germany, G
14、reece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CEN All rights of exploitati
15、on in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 22975-3:2014 EEUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORM2Contents Page Foreword . 3 Introduction . 4 1 S
16、cope . 5 2 Normative references. 5 3 Terms and definitions 5 4 Requirements and classification 6 5 Test methods for assessing material properties as measure of absorber performance . 7 5.1 Sampling and preparation of test specimens . 7 5.2 Sample conditioning 8 5.3 Solar absorptance 8 5.4 Thermal em
17、ittance 8 5.5 Adhesion . 8 6 Tests for assessing the thermal stability of absorber surfaces 8 6.1 Principle 8 6.2 Apparatus 9 6.3 Procedure for execution of high temperature tests . 10 6.4 Qualification procedure . 11 7 Tests for determining the resistance to condensed water of absorber surfaces . 1
18、1 7.1 Principle 11 7.2 Apparatus 12 7.3 Procedure for execution of constant condensation tests . 13 7.4 Qualification procedure . 14 8 Test for determining absorber surface corrosion resistance to high humidity air containing sulfur dioxide 14 8.1 Principle 14 8.2 Apparatus 15 8.3 Reference test spe
19、cimen . 16 8.4 Procedure for execution of corrosion test in high humidity air containing sulfur dioxide 16 8.5 Determination of shortest acceptable failure times in test by use of reference test specimens . 17 8.6 Qualification procedure . 17 9 Test report . 18 Annex A (normative) Procedure for dete
20、rmination of solar absorption and thermal emittance of absorber surfaces 19 Annex B (normative) Temperature and failure time characteristics in assessment of thermal stability of absorber surface . 23 Annex C (normative) Temperature/condensation and failure time characteristics together with qualifi
21、cation scheme in assessment of resistance to condensed water of absorber surface . 29 Annex D (informative) Suitable designs for test apparatus to be used in the qualification testing of solar absorber surfaces 32 Bibliography 34 DIN EN ISO 22975-3:2014-10 EN ISO 22975-3:2014 (E) ForewordThe text of
22、 ISO 22975-3:2014 has been prepared by Technical Committee ISO/TC 180 “Solar energy” 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
23、 ELOT. 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 January 2015, and conflicting national standards shall be withdrawn at the latest by January 2015. Attention is drawn to the possibility that
24、 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. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to
25、implement this European Standard: 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, Rom
26、ania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 22975-3:2014 has been approved by CEN as EN ISO 22975-3:2014 without any modification. 3DIN EN ISO 22975-3:2014-10EN ISO 22975-3:2014 (E)IntroductionTo effectively select, use and
27、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 service life. Durability in this case is the ability of a material to withstand d
28、eterioration 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 material properties important for the performance of the material meet or e
29、xceed 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 external environmental factors, which influence performance under service condition
30、s. 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 taking into account the total system. Service life assessment may be based on fee
31、d-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 short-term durability tests. During a test the optical performance of the a
32、bsorber 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 with the shortest acceptable failure time set by the design service life of the
33、 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 surface tested will be installed in a vented flat plate solar collector for
34、 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. From the results of tests, it can be concluded whether it is likely that an ab
35、sorber 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 quantitatively, with what has actually been observed on absorber surfaces tested fo
36、r 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 procedure, a more comprehensive investigation on durability is recommended and
37、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 by atmospheric sulfur dioxide. The three parts are independent and can be a
38、ssessed individually.4DIN EN ISO 22975-3:2014-10 EN ISO 22975-3:2014 (E) 1 ScopeThis part of ISO 22975 is applicable to 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 t
39、hat in a typical solar domestic hot water system or combisystem.This part of ISO 22975 specifies a failure criterion of 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 spec
40、ifies durability testing procedures focused on resistance to high temperatures and condensation of water on the absorber 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
41、and are indispensable for its application. For dated references, only the edition cited applies. For undated references, 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
42、Removal of corrosion products from corrosion test specimensISO 9050, Glass in building Determination of light transmittance, solar direct transmittance, total solar energy transmittance, ultraviolet transmittance and related glazing factorsISO 10062, Corrosion tests in artificial atmosphere at very
43、low concentrations of polluting gas(es)3 Terms and definitionsFor the purposes of this document, the following terms and 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 r
44、equirement3.2failure timetime period of exposure in the test at which the performance requirement limit is reached3.3solar absorptance, sfraction of solar radiation energy absorbed by an absorber surface5DIN EN ISO 22975-3:2014-10EN ISO 22975-3:2014 (E)3.4thermal emittance, ratio between the energy
45、per unit area radiated by a surface at a given temperature 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
46、 and classification4.1 For classification of the durability 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 te
47、st 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 emittance.NOTE 1 This perform
48、ance criterion function is primarily based on location averaged values of the performance of typical solar domestic hot water systems and combisystems.4But, in the IEA Task 10 testing procedure referred to, a slightly different definition of PC is used, namely PC = s 0,25 . Investigations made by th
49、e IEA MSTC group, however, showed that a weighting factor of 0,5 for the thermal emittance is more appropriate.9NOTE 2 Higher values for the PC function may be used if considered more appropriate. PC 0,15 MPa for all test specimens (ISO 4624).NOTE If considered accurate enough, the adhesion of the coating may be assessed by a more simple method. The method of ISO 24091may be used and the requirement for satisfactory adhes
