EN 12976-2:2017

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Thermische Solaranlagen und ihre Bauteile - Vorgefertigte Anlagen - Teil 2: PrüfverfahrenInstallations solaires thermiques et leurs composants - Installations préfabriquées en usine - Partie 2: Méthodes d’essaiThermal solar systems and components - Factory made systems - Part 2: Test methods27.160Solar energy engineeringICS:Ta slovenski standard je istoveten z:EN 12976-2:2017SIST EN 12976-2:2017en,fr,de01-april-2017SIST EN 12976-2:2017SLOVENSKI
STANDARDSIST EN 12976-2:20061DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12976-2
January
t r s y ICS
t yä s x r Supersedes EN
s t { y xæ tã t r r xEnglish Version
Thermal solar systems and components æ Factory made systems æ Part
tã Test methods Installations solaires thermiques et leurs composants æInstallations préfabriquées en usine æ Partie
t ã Méthodes d 5essai
Thermische Solaranlagen und ihre Bauteile æ Vorgefertigte Anlagen æ Teil
tã Prüfverfahren This European Standard was approved by CEN on
s w April
t r s xä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
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t r s y CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
s t { y xæ tã t r s y ESIST EN 12976-2:2017

Thermal performance presentation sheet . 37 Annex B (normative)
Reference conditions for performance prediction . 39 B.1 General . 39 B.2 Pipe diameter and insulation thickness . 42 B.3 Calculation of cold water temperature at reference location . 43 B.4 Additional set of reference conditions for annual performance calculations . 44 B.5 Reference conditions for the performance of the auxiliary heater . 47 Annex C (informative)
Assessment of the ability of solar DHW systems to resist the extreme climatic conditions . 48 C.1 Indoor and outdoor test procedure for assessment of the frost resistance of solar DWH systems with outdoor storage tank or system using heat transfer fluid with the risk of freezing . 48 C.1.1 Objective and applicability. 48 C.1.2 Apparatus and mounting of the system . 48 C.1.3 Test procedure . 49 C.1.4 Test conditions — Determination of the test conditions for freezing period . 50 C.1.5 Results . 50 C.2 Indoor test procedure for assessment of the reliability of solar DWH systems in respect of overheating protection . 51 C.2.1 Objective and applicability. 51 C.2.2 Apparatus and mounting of the system . 51 C.2.3 Test procedure . 53 C.2.4 Test conditions . 53 C.2.5 Results . 55 Annex D (informative)
Ageing test for thermostatic valves . 57 D.1 General . 57 D.2 Test arrangement . 57 D.3 Test Procedure . 58 D.4 Results . 59 Annex E (informative)
Lightning protection test for solar heating systems . 60 E.1 Field of application. 60 E.2 Purpose . 60 E.3 Requirements . 60 E.4 Apparatus . 61 E.5 Test procedure . 61 E.5.1 Test conditions . 61 E.5.2 Solar heating system installation. 61 E.5.3 Separation distance St. 61 SIST EN 12976-2:2017

Lightning Protection testing sheet . 63 Annex G (normative)
Reporting format in the framework of the EU Regulations CDR 811, 812 and 814 dated 2013 . 67 Annex ZA (informative)
Relationship between this European Standard and the energy labelling requirements of Commission Delegated Regulation (EU) No 811/2013 aimed to be covered . 68 Annex ZB (informative)
Relationship between this European Standard and the energy labelling requirements of Commission Delegated Regulation (EU) No 812/2013 aimed to be covered . 70 Annex ZC (informative)
Relationship between this European Standard and the ecodesign requirements of Commission Regulation (EU) No 814/2013 aimed to be covered . 73 Bibliography . 75
Tables Table 1 — Division for factory made and custom built solar heating systems . 9 Table 2 — Selection of the performance test method . 23 Table 3 — Parameter a values for different load volumes . 23 Table 4 — Daily heat demand for load profiles . 28 Table 5 — Adjustment factors . 30 Table 6 — Load profile selection . 30 Table A.1 — Presentation of the system performance indicators for solar-plus-supplementary systems . 37 Table A.2 — Presentation of the system performance indicators for solar-only and solar preheat systems . 38 Table B.1 — Reference conditions for performance presentation . 40 Table B.2 — Pipe diameter and insulation thickness for forced-circulation systems . 42 Table B.3 — Pipe diameter and insulation thickness for thermosiphon systems . 42 Table B.4 — Data for calculation of the cold water temperature at the reference locations. 43 Table B.5 — Reference conditions for performance presentation limited to the deviations from Table B.1 . 44 Table B.6 — Monthly and average annual reference outside air temperatures for two climate zones in °C . 46 SIST EN 12976-2:2017

Figures Figure 1 — Dimensions of the system to be measured . 18 Figure 2 — Force orthogonal to surface of system — Side view . 19 Figure 3 — Energy balance for one-store solar-plus-supplementary systems (example) . 25 Figure 4 — Energy balance for solar-only systems . 26 Figure 5 — Energy balance for solar preheat systems . 27 Figure A.1 — Thermal performance presentation sheet . 37 Figure C.1 — Scheme of the test set-up . 52 Figure D.1 — Test arrangement for thermostatic valve test . 58
NOTE Forced circulation systems can be classified either as Factory Made or as Custom Built, depending on the market approach chosen by the final supplier. 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 EN 12977–2:2012, Annex A. In practice, the installation conditions may differ from these reference conditions. 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. SIST EN 12976-2:2017

In general, the minimum allowed temperature of the system is equal to the freezing point of the antifreeze fluid. If the concentration of some antifreeze fluids like glycols - exceeds a certain limit, they can freeze without damaging the system. In this case the minimum allowed temperature can be lower than the freezing point of the antifreeze fluid. Check the freezing point by measuring the glycol concentration (e.g. using a portable refractometer) before and after the over temperature protection test (5.2). The freezing point shall not differ more than 2 K from the value recommended by the manufacturer in agreement with the local climate (minimum expected air temperature, radiative cooling of the collectors). The composition of the fluid shall be checked to see whether it is in accordance with the manufacturer’s specifications. 5.1.3 Drain-back systems When freezing danger occurs, the fluid in the system components that is exposed to low ambient temperature, is drained into a storage vessel for subsequent reuse. The collector loop piping should be in accordance with the manufacturer’s recommendations in the installer manual and if there is no instruction, according to reference conditions given in Annex B. Filling may be observed from the pressure gauge or from water level indicator. Switch the pump on, and observe the pressure gauge or water level indicator. If the system does not include a pressure gauge or SIST EN 12976-2:2017

For systems where the freeze protection and control functions are combined, the control unit shall be checked as follows: Set the simulated temperature of the freeze-protection sensor to a value deactivating the freeze protection. Decrease the simulated temperature slowly. Measure the temperature TFP (freeze protection) of the related actuator. Compare it with the nominal value given by the manufacturer. 5.1.6 Other systems For all other systems, the pump control system, drain-down valve or any other freeze protection device or system shall be checked to the manufacturer's specification and the minimum allowed temperature specified by the manufacturer. For Integrated Collector-Storage Systems (ICS), or other Solar Domestic Hot Water (SDHW) systems with the tank placed outside, special frost resistance tests should be carried out, as described in C.1. SIST EN 12976-2:2017

1) for the outdoor test, operate the system for three consecutive days without any hot water withdrawal with a minimal solar irradiation of 20 MJ/m2 per day and with ambient temperature higher than 20 °C during solar noon; SIST EN 12976-2:2017

operate the system without any hot water withdrawal at an ambient temperature of (25 ± 2) °C and a minimum solar lamp irradiance of 1 000 W/m2 at the plane of the collector array, measured and with a uniformity as specified in ISO 9459-1:1993, 6.3.1.2 for a 5 h period or until the collector array drains; ii)
disconnect all electrical power to the system and subject the system to a solar lamp irradiance of 1 000 W/m2 at the plane of the collector array for an additional 4 h or until the collector array drains; e)
at the end of sequence d) or immediately after the collector drains, withdraw a volume of water greater than the total volume of water in the system at a rate of (2 × 10-4 ± 3 × 10-5) m3/s (10 ± 1) l/min. 5.2.4 Reporting requirements The following results shall be reported: a) the make and model identification of the sys
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