BS-EN-12976-2-2001.pdf

| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 12976-2:2001 The European Standard EN 12976-2:2000 has the status of a British Standard ICS 27.160 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Thermal solar systems and components Ð Factory made systems Part 2: Test methods Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 07:14:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI This British Standard, having been prepared under the direction of the Engineering Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 February 2001 BSI 02-2001 ISBN 0 580 36859 9 BS EN 12976-2:2001 Amendments issued since publication Amd. No.DateComments National foreword This British Standard is the official English language version of EN 12976-2:2000. The UK participation in its preparation was entrusted to Technical Committee RHE/25, Solar heating, which has the responsibility to: Ð aid enquirers to understand the text; Ð present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; Ð monitor related international and European developments and promulgate them in the UK. 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 Standards Catalogue under the section entitled ªInternational Standards Correspondence Indexº, or by using the ªFindº facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 56, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 07:14:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN 12976-2 December 2000 ICS 27.160 English version Thermal solar systems and components - Factory made systems - Part 2: Test methods Installations solaires thermiques et leurs composants - Installations préfabriquées en usine - Partie 2: Méthodes d'essais Thermische Solaranlagen und ihre Bauteile - Vorgefertigte Anlagen - Teil 2: Prüfverfahren This European Standard was approved by CEN on 24 November 2000. 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 such national standards may be obtained on application to the 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 Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels © 2000 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12976-2:2000 E Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 07:14:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 2 EN 12976-2:2000 Contents Page Foreword 3 Introduction 4 1Scope 6 2Normative references 6 3Terms and definitions 6 4Symbols and abbreviations 7 5Testing 7 5.1 Freeze resistance 7 5.2 Over temperature protection 9 5.3 Pressure resistance . 9 5.4 Water contamination 9 5.5 Lightning protection 9 5.6 Mechanical strength of supporting frame 9 5.7 Safety equipment. 10 5.8 Marking 10 5.9 Thermal performance characterisation 10 5.10Ability of solar-plus-supplementary systems to cover the load 15 5.11Reverse flow protection 17 5.12Electrical safety 17 Annex A (normative) Thermal performance presentation sheet 18 Annex B (normative) Reference conditions for performance prediction 20 Annex C (informative) Extreme climate test procedure for the assesment of the frost resistance of solar DHW systems with outdoor tank . 24 Annex D (informative) Ageing test for thermostatic valves. 39 Annex E (informative) Lightning protection test for solar systems 41 Annex F (informative) Lightning Protection testing sheet. 44 Annex G (informative) Testing sheet for the mechanical strength of supports. 48 Annex H (informative) Mechanical strength test of the supporting frame . 51 Bibliography. 56 Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 07:14:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 3 EN 12976-2:2000 Foreword This European Standard has been prepared 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, either by publication of an identical text or by endorsement, at the latest by June 2001, and conflicting national standards shall be withdrawn at the latest by June 2001. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. The annexes A and B are normative. The annexes C, D, E, F, G and H are informative. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 07:14:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 4 EN 12976-2:2000 Introduction Drinking water quality In respect of potential adverse effects on the quality of water intended for human consumption, caused by the product covered by this standard: a) This standard provides no information as to whether the product may be used without restriction in any of the Member States of the EU or EFTA; b) It should be noted that, while awaiting the adoption of verifiable European criteria, existing national regulations concerning the use and/or the characteristics of this product remain in force. Factory Made and Custom Built solar heating systems The standards EN 12976-1:2000 as well as EN 12976-2 and the prestandards prENV 12977-1:2000 to prENV 12977-3:2000 distinguish two categories of solar heating systems: Factory Made solar heating systems and Custom Built solar heating systems. The classification of a system as Factory Made or Custom Built is a choice of the final supplier, in accordance with the following definitions: Factory Made solar heating systems are batch products with one trade name, sold as complete and ready to install kits, with fixed configurations. Systems of this category are considered as a single product and assessed as a whole. If a Factory Made Solar Heating System is modified by changing its configuration or by changing one or more of its components, the modified system is considered as a new system for which a new test report is necessary. Requirements and test methods for Factory Made solar heating systems are given in EN 12976-1:2000 and EN 12976-2. Custom Built solar heating systems are either uniquely built, or assembled by choosing from an assortment of components. Systems of this category are regarded as a set of components. The components are separately tested and test results are integrated to an assessment of the whole system. Requirements for Custom Built solar heating systems are given in prENV 12977-1:2000, test methods are specified in prENV 12977-2:2000 and prENV 12977-3:2000. Custom Built solar heating systems are subdivided into two categories: - Large Custom Built systems are uniquely designed for a specific situation. In general HVAC engineers, manufacturers or other experts design them. - Small Custom Built systems offered by a company are described in a so-called assortment file, in which all components and possible system configurations, marketed by the company, are specified. Each possible combination of a system configuration with components from the assortment is considered as one Custom Built system. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 07:14:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 5 EN 12976-2:2000 Table 1 shows the division for different system types: Table 1 - Division for factory made and custom built solar heating systems Factory Made Solar Heating Systems (EN 12976-1, -2) Custom Built Solar Heating Systems (ENV 12977-1, -2, -3) Integral collector-storage systems for domestic hot water preparation Forced-circulation systems for hot water preparation and/or space heating, assembled using components Thermosiphon systems for domestic hot water preparation and configurations described in a documentation file (mostly small systems) Forced-circulation systems as batch product with fixed configuration for domestic hot water preparation Uniquely designed and assembled systems for hot water preparation and/or space heating (mostly large systems) NOTE 1 Forced circulation systems can be classified either as Factory Made or as Custom Built, depending on the market approach chosen by the final supplier. NOTE 2 Both Factory Made and Custom Built systems are performance tested under the same set of reference conditions as specified in Annex B of the present standard and Annex A of prENV 12977- 2:2000. In practice, the installation conditions may differ from these reference conditions. NOTE 3 A Factory Made system for domestic hot water preparation may have an option for space heating, however this option should not be used or considered during testing as a Factory Made system. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 07:14:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 6 EN 12976-2:2000 1 Scope This European Standard specifies test methods for validating the requirements for Factory Made Thermal Solar Heating Systems as specified in EN 12976-1:2000. The standard also includes two test methods for thermal performance characterization by means of whole system testing. 2 Normative references This European Standard incorporates, by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). prEN 1717:1999, Protection against pollution of potable water in drinking water installations and general requirements of devices to prevent pollution by backflow ENV 1991-2-3 Eurocode 1 Basis of design and actions on structures - Part 2 - 3: Action on structures - Snow loads ENV 1991-2-4 Eurocode 1 Basis of design and actions on structures - Part 2 - 4: Action on structures - Wind loads prEN 12975-2:2000 Thermal solar systems and components - Solar collectors - Test methods EN 12976-1:2000 Thermal solar systems and components - Factory made systems - General requirements prENV 12977-2:2000 Thermal solar systems and components Custom built systems Test methods EN 60335-1 Safety of household and similar electrical appliances - Part 1: General requirements (IEC 60335-1:1991 modified) EN 60335-2-21:1999 Safety of household and similar electrical appliances - Part 2: Particular requirements for storage water heaters (IEC 60335-2-21:1997 + Corrigendum 1998, modified) EN 60343 Recommended test methods for determining the relative resistance of insulating materials to breakdown by surface discharges (IEC 60343: 1991) ENV 61024-1 Protection of structures against lightning - Part 1: General principles (IEC 61024-1:1990, modified) EN ISO 9488 Solar energy Vocabulary (ISO 9488:1999) ISO 9459-2 Solar heating Domestic water heating systems Part 2: Outdoor test method for system performance characterization and yearly performance prediction for solar-only systems ISO/DIS 9459-5:1997 Solar heating Domestic water heating systems Part 5: System performance characterization by means of whole-system tests and computer simulation ISO/DIS 11924 Solar heating Domestic water heating systems Test methods for the assessment of reliability and safety 3 Terms and definitions For the purpose of this standard, the terms and definitions given in EN ISO 9488 apply, together with the definitions given in clause 3 of EN 12976-1:2000. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 07:14:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 7 EN 12976-2:2000 4 Symbols and abbreviations Qaux, net net auxiliary energy demand of a solar heating system delivered by the auxiliary heater to the store or directly to the distribution system (see 5.9.3.2) Qd heat demand QL energy delivered at the outlet of the solar heating system Qpar parasitic energy (electricity) for the collector loop pump(s) and control unit Hc hemispherical solar irradiation in the collector plane Ql store heat loss Qohp heat diverted from the store as active overheating protection, if any Qsol heat delivered by the collector loop to the store 5 Testing 5.1 Freeze resistance 5.1.1 General The following checks are given to ensure that the protective antifreezing provisions are operating properly. There are many possible forms of protective provisions, and the testing authority shall first identify which method has been employed. The provision shall then be checked in accordance with the appropriate section of the following list (see 5.1.2 to 5.1.6) in accordance to the manufacturers recommendations. 5.1.2 Systems using antifreeze fluid The system components which are exposed to low ambient temperature are filled with an antifreeze fluid, usually a glycol/water mixture, having a low enough freezing point. For these systems, no freezing test is performed. However, if no sufficient data is available on the freezing point of the antifreeze f