Thermal solar systems and components - Factory made systems - Part 2: Test methods

This document specifies test methods for validating the requirements for Factory Made Thermal Solar Heating Systems as specified in EN 12976-1. The document also includes two test methods for thermal performance characterization by means of whole system testing.

Thermische Solaranlagen und ihre Bauteile - Vorgefertigte Anlagen - Teil 2: Prüfverfahren

Dieses Dokument legt Verfahren für die Prüfung der Erfüllung der Anforderungen für vorgefertigte thermische Solaranlagen fest, wie sie in EN 12976 1 angegeben sind. Dieses Dokument enthält auch zwei Prüfverfahren zur Charakterisierung der thermischen Leistungsfähigkeit durch Prüfung der Gesamtanlage.

Installations solaires thermiques et leurs composants - Installations préfabriquées en usine - Partie 2 : Méthodes d'essai

Le présent document spécifie des méthodes d’essai permettant de valider les exigences applicables aux installations de chauffage solaire thermique préfabriquées en usine, telles que spécifiées dans le EN 12976-1. Le document comprend également deux méthodes d’essai pour la caractérisation des performances thermiques de l’installation dans son ensemble.

Toplotni sončni sistemi in sestavni deli - Industrijsko izdelani sistemi - 2. del: Preskusne metode

Ta evropski standard določa preskusne metode za preverjanje zahtev za industrijsko izdelane sončne ogrevalne sisteme, kot je določeno v standardu EN 12976-1. Standard vključuje tudi dve preskusni metodi za opredelitev toplotne učinkovitosti s pomočjo preskušanja sistema.

General Information

Status
Published
Publication Date
26-Mar-2019
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
27-Mar-2019
Completion Date
27-Mar-2019

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SLOVENSKI STANDARD
SIST EN 12976-2:2019
01-julij-2019
Nadomešča:
SIST EN 12976-2:2017

Toplotni sončni sistemi in sestavni deli - Industrijsko izdelani sistemi - 2. del:

Preskusne metode

Thermal solar systems and components - Factory made systems - Part 2: Test methods

Thermische Solaranlagen und ihre Bauteile - Vorgefertigte Anlagen - Teil 2:
Prüfverfahren

Installations solaires thermiques et leurs composants - Installations préfabriquées en

usine - Partie 2 : Méthodes d'essai
Ta slovenski standard je istoveten z: EN 12976-2:2019
ICS:
27.160 Sončna energija Solar energy engineering
SIST EN 12976-2:2019 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 12976-2:2019
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SIST EN 12976-2:2019
EN 12976-2
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2019
EUROPÄISCHE NORM
ICS 27.160 Supersedes EN 12976-2:2017
English Version
Thermal solar systems and components - Factory made
systems - Part 2: Test methods

Installations solaires thermiques et leurs composants - Thermische Solaranlagen und ihre Bauteile -

Installations préfabriquées en usine - Partie 2 : Vorgefertigte Anlagen - Teil 2: Prüfverfahren

Méthodes d'essai
This European Standard was approved by CEN on 30 December 2018.

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 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 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, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12976-2:2019 E

worldwide for CEN national Members.
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SIST EN 12976-2:2019
EN 12976-2 2019 (E)
Contents Page

European foreword ....................................................................................................................................................... 4

Introduction .................................................................................................................................................................... 6

1 Scope .................................................................................................................................................................... 8

2 Normative references .................................................................................................................................... 8

3 Terms and definitions ................................................................................................................................... 8

4 Symbols and abbreviations ......................................................................................................................... 9

5 Testing ................................................................................................................................................................. 9

5.1 Freeze resistance ............................................................................................................................................. 9

5.1.1 General ................................................................................................................................................................ 9

5.1.2 Systems using antifreeze fluid .................................................................................................................... 9

5.1.3 Drain-back systems ..................................................................................................................................... 10

5.1.4 Drain-down systems ................................................................................................................................... 10

5.1.5 Freeze protection and combined control functions ........................................................................ 10

5.1.6 Other systems ................................................................................................................................................ 11

5.2 Over temperature protection .................................................................................................................. 11

5.2.1 Purpose ............................................................................................................................................................ 11

5.2.2 Apparatus ........................................................................................................................................................ 11

5.2.3 Procedure........................................................................................................................................................ 11

5.2.4 Reporting requirements ............................................................................................................................ 12

5.3 Pressure resistance ..................................................................................................................................... 12

5.3.1 Purpose ............................................................................................................................................................ 12

5.3.2 Apparatus ........................................................................................................................................................ 12

5.3.3 Safety precaution ......................................................................................................................................... 13

5.3.4 Procedure........................................................................................................................................................ 13

5.3.5 Reporting requirements ............................................................................................................................ 14

5.4 Water contamination .................................................................................................................................. 14

5.5 Testing the resistance against mechanical load ............................................................................... 15

5.5.1 Purpose ............................................................................................................................................................ 15

5.5.2 Apparatus ........................................................................................................................................................ 15

5.5.3 Safety precaution ......................................................................................................................................... 16

5.5.4 Calculation procedure for the mechanical load ................................................................................ 16

5.5.5 Procedure........................................................................................................................................................ 18

5.5.6 Reporting requirements ............................................................................................................................ 18

5.6 Lightning protection ................................................................................................................................... 19

5.7 Safety equipment.......................................................................................................................................... 19

5.7.1 Safety valves ................................................................................................................................................... 19

5.7.2 Safety lines and expansion lines ............................................................................................................. 20

5.7.3 Blow-off lines ................................................................................................................................................. 20

5.8 Labelling .......................................................................................................................................................... 20

5.9 Thermal performance characterization .............................................................................................. 21

5.9.1 Introduction ................................................................................................................................................... 21

5.9.2 Test procedure .............................................................................................................................................. 21

5.9.3 Prediction of yearly performance indicators ..................................................................................... 22

5.10 Ability of solar-plus-supplementary systems to cover the load .................................................. 29

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SIST EN 12976-2:2019
EN 12976-2:2019 (E)

5.10.1 General ............................................................................................................................................................. 29

5.10.2 Boundary conditions for auxiliary heating ......................................................................................... 30

5.10.3 Boundary conditions for daily load ........................................................................................................ 30

5.10.4 Determination of the ability to cover the maximum daily load by means of testing

the system........................................................................................................................................................ 31

5.10.5 Determination of the ability to cover the maximum daily load by means of numerical

simulations...................................................................................................................................................... 31

5.10.6 Determination of the ability to cover the daily load defined by the European load

profiles by means of numerical simulations ....................................................................................... 31

5.10.7 Requirements for mixed water at 40 °C ............................................................................................... 32

5.11 Reverse flow protection ............................................................................................................................. 33

5.12 Electrical safety ............................................................................................................................................. 33

Annex A (normative) Thermal performance presentation sheet............................................................. 34

Annex B (normative) Reference conditions for performance prediction ............................................. 36

Annex C (informative) Assessment of the ability of solar DHW systems to resist the extreme

climatic conditions ....................................................................................................................................... 45

Annex D (informative) Ageing test for thermostatic valves ....................................................................... 54

Annex E (informative) Lightning protection test for solar heating systems ........................................ 57

Annex F (informative) Lightning Protection testing sheet ......................................................................... 60

Annex G (normative) Reporting format in the framework of the EU Regulations CDR 811,

812 and 814 dated 2013 ............................................................................................................................ 64

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 ..................................................................................................................................... 65

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 ..................................................................................................................................... 67

Annex ZC (informative) Relationship between this European Standard and the ecodesign

requirements of Commission Regulation (EU) No 814/2013 aimed to be covered ............. 70

Bibliography ................................................................................................................................................................. 72

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SIST EN 12976-2:2019
EN 12976-2 2019 (E)
European foreword

This document (EN 12976-2:2019) 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 September 2019, and conflicting national standards

shall be withdrawn at the latest by September 2019.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 12976-2:2017.

This document has been prepared under a mandate given to CEN by the European Commission and the

European Free Trade Association, and supports essential requirements of EU Directive(s).

For relationship with EU Directive(s), see informative Annexes ZA, ZB or ZC, which are an integral part

of this document.

Most significant changes in EN 12976-1:2019 and EN 12976-2:2019 since the 2017 editions of both

parts:

The first edition of the EN 12976 series was published in 2000. The standard series provided an

important basis for the assessment of the performance as well as the reliability and durability of

Factory made solar thermal systems. In the past 15 years or so, several important technological

developments and changes of the framework conditions, such as e.g. the aspect of requiring “Energy

Labelling”, the EN 12976 series underwent several important changes.

The following modifications are the most important ones that have been implemented in this new

edition of EN 12976-2:

— beside few editorial changes, more clarification with respect to testing requirements of reverse

flow protection (Clause 5.11) and mechanical load testing (Clause 5.5).

— confusion about different Qref values in Table B.5 has been solved by using the complete equation

for the annual loads. Finally, there should only be one Qref value.
— main changes related to ErP and the new mechanical load test;
— Annex ZA (new): harmonisation with Regulation (EC) No 811/2013;
— Annex ZB (new): harmonisation with Regulation (EC) No 812/2013:
— Annex ZC (new): harmonisation with Regulation (EC) No 814/2013.

It is worth to notice that, based on these changes and developments, the need for the elaboration of a

future strategy of the structure of the EN 12976 series is foreseen.

EN 12976, Thermal solar systems and components — Factory made systems, is currently composed with

the following parts:
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SIST EN 12976-2:2019
EN 12976-2:2019 (E)
— Part 1: General requirements;
— Part 2: Test methods.

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the

following countries are bound to 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, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
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SIST EN 12976-2:2019
EN 12976-2 2019 (E)
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 document:

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, EN 12976-2, EN 12977-1, EN 12977-2, EN 12977-3, EN 12977-4 and

EN 12977-5 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 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 EN 12977-1; test methods are

specified in EN 12977-2, EN 12977-3, EN 12977-4 and EN 12977-5. 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.
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SIST EN 12976-2:2019
EN 12976-2:2019 (E)
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 Custom Built Solar Heating Systems
(EN 12976–1 and EN 12976–2) (EN 12977–1, EN 12977–2 and EN 12977–3)

Integrated collector storage systems for domestic Forced-circulation systems for hot water

hot water preparation preparation and/or space heating, assembled
using components and configurations described in
Thermosiphon systems for domestic hot water
an assortment file (mostly small systems)
preparation

Forced-circulation systems as batch product with Uniquely designed and assembled systems for hot

fixed configuration for domestic hot water water preparation and/or space heating (mostly

preparation large systems)

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 12977–2:2018, 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.

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SIST EN 12976-2:2019
EN 12976-2 2019 (E)
1 Scope

This document specifies test methods for validating the requirements for Factory Made Thermal Solar

Heating Systems as specified in EN 12976-1. The document also includes two test methods for thermal

performance characterization by means of whole system testing.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

EN 1489:2000, Building valves - Pressure safety valves — Tests and requirements

EN 1717:2000, Protection against pollution of potable water in water installations and general

requirements of devices to prevent pollution by backflow

EN ISO 4126-1, Safety devices for protection against excessive pressure — Part 1: Safety valves

(ISO 4126-1)

EN 12976-1:2017, Thermal solar systems and components — Factory made systems — Part 1: General

requirements

EN 12977-2:2018, Thermal solar systems and components — Custom built systems — Part 2: Test

methods for solar water heaters and combisystems
EN 15502-1, Gas-fired heating boilers — Part 1: General requirements and tests
EN ISO 9488:1999, Solar energy — Vocabulary (ISO 9488:1999)

EN ISO 9806:2017, Solar energy — Solar thermal collectors — Test methods (ISO 9806:2017)

ISO 9459-1:1993, Solar heating — Domestic water heating systems — Part 1: Performance rating

procedure using indoor test methods

ISO 9459-2:1995, Solar heating — Domestic water heating systems — Part 2: Outdoor test methods for

system performance characterization and yearly performance prediction of solar-only systems

ISO 9459-5:2007, Solar heating — Domestic water heating systems — Part 5: System performance

characterization by means of whole-system tests and computer simulation
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN ISO 9488:1999 and

EN 12976-1:2017 apply.
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SIST EN 12976-2:2019
EN 12976-2:2019 (E)
4 Symbols and abbreviations

Q net auxiliary energy demand of a solar heating system delivered by the auxiliary heater

aux, net
to the store or directly to the distribution system (see 5.9.3.2)
Q heat demand
Q energy delivered at the outlet of the solar heating system
Q parasitic energy (electricity) for the collector loop pump(s) and control unit
par
H hemispherical solar irradiation in the collector plane
Q store heat loss
Q heat diverted from the store as active overheating protection, if any
ohp
Q heat delivered by the collector loop to the store
sol
5 Testing
5.1 Freeze resistance
5.1.1 General

The following checks are given to ensure that the protective anti-freezing 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 with the manufacturer’s 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 thermosiphon systems

declared as freeze resistant down to a specific temperature, one possible test procedure described in

AS/NZS 2712 is recommended. This procedure could also be adapted to other systems containing pure

water. So far, electrical heater for freeze protection will not be tested for suitability.

For these systems, no freezing test is performed. However, if no sufficient data are available on the

freezing point of the antifreeze fluid, the freezing point shall be measured and checked against the

minimum system temperature as given by the manufacturer.

NOTE 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.
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SIST EN 12976-2:2019
EN 12976-2 2019 (E)
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

level indicator, other means for checking filling provided by the manufacturer shall be used in

accordance with the instruction manual.

Drain-back may be observed from the decreasing reading of the pressure gauge or water level indicator.

Switch the pump OFF, and observe the pressure gauge or water level indicator. If the system does not

include a pressure gauge or level indicator, other means for checking drain-back provided by the

manufacturer shall be used in accordance with the instruction manual.

A system in which components and/or piping are subject to damage by freezing shall have the proper

fittings, pipe slope and collector design to allow for manual gravity draining and air filling of the

affected components and piping. Pipe slope for gravity draining shall be as the manufacturer

recommendation or shall have a minimum 2 cm vertical drop for each meter of horizontal length. This

also applies to any header pipes or absorber plate riser tubes internal to the collector.

5.1.4 Drain-down systems

The fluid in the system components, which are exposed to low ambient temperature, is drained and run

to waste when freezing danger occurs.

To perform checks of the drain-down function 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.

In most cases the systems are equipped with a drain-down valve at the bottom and a vacuum relief

valve at the top of the fluid circuit.

The proper opening and closing of the vacuum relief valve shall be checked during drain-down

operation and after refilling the system.

If there is a solenoid drain valve independent of the control unit, simulate the opening temperature.

If there is a non-electrically operated freeze protection valve, a check can be made using a freezing

spray. The temperature-sensing element shall be sprayed. The measured temperature of the valve

opening shall be compared with the nominal value given by the manufacturer. It is important that the

sensing part of the freeze protection valve be properly placed.

If the system uses an electrically operated freeze-protection valve, drain down shall be checked while

interrupting the power.

The drain-down rate shall be measured (e.g. by using a vessel and a stop-watch) and documented

during drain-down operation.
5.1.5 Freeze protection and combined control functions

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 te
...

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