SIST EN 12976-2:2006
(Main)Thermal solar systems and components - Factory made systems - Part 2: Test methods
Thermal solar systems and components - Factory made systems - Part 2: Test methods
This European Standard specifies test methods for validating the requirements for Factory Made Thermal Solar Heating Systems as specified in EN 12976-1. The standard 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
Diese Europäische Norm legt Verfahren für die Prüfung der Erfüllung der Anforderungen für vorgefertigte thermische Solaranlagen fest, wie sie in prEN 12976-1 angegeben sind. Die Norm enthält auch zwei Prüfverfahren zur Charakterisierung der Wärmeleistung durch Prüfung der Gesamtanlage
Installations solaires thermiques et leurs composants - Installations préfabriquées en usine - Partie 2: Méthodes d'essai
La présente Norme européenne 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 prEN 12976-1. La norme comprend également deux méthodes d'essai pour la caractérisation des performances thermiques a l'aide d'essais de l'installation dans son intégralité.
Toplotni sončni sistemi in sestavni deli - Industrijsko izdelani sistemi - 2. del: Preskusne metode
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 12976-2:2006
01-maj-2006
1DGRPHãþD
SIST EN 12976-2:2002
7RSORWQLVRQþQLVLVWHPLLQVHVWDYQLGHOL,QGXVWULMVNRL]GHODQLVLVWHPLGHO
3UHVNXVQHPHWRGH
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 12976-2:2006
ICS:
27.160 6RQþQDHQHUJLMD Solar energy engineering
SIST EN 12976-2:2006 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 12976-2:2006
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SIST EN 12976-2:2006
EUROPEAN STANDARD
EN 12976-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2006
ICS 27.160 Supersedes EN 12976-2:2000
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 - Vorgefertigte
Installations préfabriquées en usine - Partie 2: Méthodes Anlagen - Teil 2: Prüfverfahren
d'essai
This European Standard was approved by CEN on 9 December 2005.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,
Slovakia, Slovenia, 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
© 2006 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12976-2:2006: E
worldwide for CEN national Members.
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SIST EN 12976-2:2006
EN 12976-2:2006 (E)
Contents Page
Foreword .4
Introduction.5
1 Scope .7
2 Normative references .7
3 Terms and definitions.7
4 Symbols and abbreviations.8
5 Testing .8
5.1 Freeze resistance.8
5.1.1 General .8
5.1.2 Systems using antifreeze fluid.8
5.1.3 Drain-back systems .9
5.1.4 Drain-down systems .9
5.1.5 Freeze protection and control functions combined .9
5.1.6 Other systems .9
5.2 Over temperature protection.10
5.2.1 Purpose .10
5.2.2 Apparatus .10
5.2.3 Procedure .10
5.2.4 Reporting requirements .11
5.3 Pressure resistance.11
5.3.1 Purpose .11
5.3.2 Apparatus .11
5.3.3 Safety precaution.11
5.3.4 Procedure .12
5.3.5 Reporting requirements .12
5.4 Water contamination.13
5.5 Lightning protection .13
5.6 Safety equipment .13
5.6.1 Safety valves .13
5.6.2 Safety lines and expansion lines .13
5.6.3 Blow-off lines .13
5.7 Labelling .13
5.8 Thermal performance characterisation .13
5.8.1 Introduction.13
5.8.2 Test procedure .14
5.8.3 Prediction of yearly performance indicators .14
5.9 Ability of solar-plus-supplementary systems to cover the load.19
5.9.1 General .19
5.9.2 Boundary conditions for auxiliary heating.19
5.9.3 Boundary conditions for daily load .19
5.9.4 Determination of the ability to cover the maximum daily load by means of testing the
system .20
5.9.5 Determination of the ability to cover the maximum daily load by means of numerical
simulations.20
5.10 Reverse flow protection .20
5.11 Electrical safety.21
Annex A (normative) Thermal performance presentation sheet.22
Annex B (normative) Reference conditions for performance prediction .25
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SIST EN 12976-2:2006
EN 12976-2:2006 (E)
B.1 General .25
B.2 Pipe diameter and insulation thickness .27
B.3 Calculation of cold water temperature at reference location .28
Annex C (informative) Extreme climate test procedure for the assessment of the frost resistance
of solar DHW systems with outdoor tank .30
C.1 Indoor test procedure for assessment of the frost resistance of solar DWH
systems with outdoor tank .30
C.1.1 Objective and applicability.30
C.1.2 Apparatus and mounting of the system.30
C.1.3 Test procedure.33
C.1.4 Test conditions .35
C.1.5 Results.39
C.2 Indoor test procedure for assessment of the reliability of solar DWH systems in
respect of overheating protection.39
C.2.1 Objective and applicability.39
C.2.2 Apparatus and mounting of the system.39
C.2.3 Test procedure.42
C.2.4 Test conditions .43
C.2.5 Results.44
Annex D (informative) Ageing test for thermostatic valves .46
D.1 General .46
D.2 Test arrangement.46
D.3 Test Procedure.47
D.4 Results.47
Annex E (informative) Lightning protection test for solar heating systems .48
E.1 Field of application .48
E.2 Purpose .48
E.3 Requirements.48
E.4 Apparatus .49
E.5 Test procedure.49
E.5.1 Test conditions .49
E.5.2 Solar heating system installation .49
E.5.3 Separation distance S .49
t
E.5.4 Size of the bonding cable or strip.49
E.5.5 Bridging between tank and supports .50
E.5.6 Bridging between collectors and supports.50
E.5.7 Bridging between collectors and tank.50
E.5.8 Connecting terminal with Lightning Protection System (LPS).50
E.5.9 Metal sheets covering parts of the solar heating system .50
E.5.10 Heating effects due to lightning currents .50
E.5.11 Mechanical durability due to lightning mechanical loads .50
E.6 Report .50
E.7 Conclusions .50
Annex F (informative) Lightning Protection testing sheet .51
Bibliography.55
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SIST EN 12976-2:2006
EN 12976-2:2006 (E)
Foreword
This European Standard (EN 12976-2:2006) 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 July 2006, and conflicting national standards shall be withdrawn at the
latest by July 2006.
This European Standard supersedes EN 12976-2:2000.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden,
Switzerland and United Kingdom.
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SIST EN 12976-2:2006
EN 12976-2:2006 (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 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 as well as EN 12976-2 and the prestandards ENV 12977-1 to ENV 12977-3
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 ENV 12977-1; test methods are specified in ENV 12977-2
and ENV 12977-3.
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 12976-2:2006
EN 12976-2:2006 (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, -2) (ENV 12977-1, -2, -3)
Integral collector-storage systems for Forced-circulation systems for hot water preparation
domestic hot water preparation and/or space heating, assembled using components
Thermosiphon systems for domestic hot and configurations described in a documentation file
water preparation (mostly small systems)
Forced-circulation systems as batch Uniquely designed and assembled systems for hot water
product with fixed configuration for preparation and/or space heating
domestic hot water preparation
(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 ENV 12977-2:2001. 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.
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SIST EN 12976-2:2006
EN 12976-2:2006 (E)
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. The standard also includes two test methods for thermal
performance characterization by means of whole system testing.
2 Normative references
The following referenced documents are indispensable for the application of this European Standard. For
dated references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
EN 12975-2, Thermal solar systems and components – Factory made systems – Part 2: Test methods
EN 12976-1:2006, Thermal solar systems and components - Factory made systems – Part 1: General
requirements
ENV 12977-2:2001, Thermal solar systems and components — Custom built systems — Part 2: Test methods
EN 60335-1, Household and similar electrical appliances - Safety - Part 1: General requirements (IEC 60335-
1:2001, modified)
EN 60335-2-21, Household and similar electrical appliances - Safety - Part 2-21: Particular requirements for
storage water heaters (IEC 60335-2-21:2002, modified)
EN ISO 9488:1999, Solar energy – Vocabulary (ISO 9488:1999)
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/DIS 9459-5, 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 European Standard, the terms and definitions given in EN ISO 9488:1999 and EN
12976-1:2005 apply.
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SIST EN 12976-2:2006
EN 12976-2:2006 (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 5.8.3.2)
Q heat demand
d
Q energy delivered at the outlet of the solar heating system
L
Q parasitic energy (electricity) for the collector loop pump(s) and control unit
par
H hemispherical solar irradiation in the collector plane
c
Q store heat loss
l
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 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 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 these systems, no freezing test is performed. However, if no sufficient data is 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 glycol’s - 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). The
freezing point should be as 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 12976-2:2006
EN 12976-2:2006 (E)
5.1.3 Drain-back systems
The fluid in the system components, which are exposed to low ambient temperature, is drained into a storage
vessel for subsequent reuse when freezing danger occurs.
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. It might be necessary to repeat the check at high storage
temperature (90 °C) in order to insure drain-back in all situations (see 5.2).
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.
Check the proper opening and closing of the vacuum relief valve.
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 is to 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.
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.
Open drain-down valve manually and measure the drain rate with a vessel and a stop-watch.
If the system uses an electrically operated freeze-protection valve, drain down shall be checked while
interrupting the power.
5.1.5 Freeze protection and control functions combined
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 T of the related
FP (freeze-protection)
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 ICS systems, or other SDHW systems with the tank placed outside, special frost
resistance tests should be carried out, as described in C.1.
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SIST EN 12976-2:2006
EN 12976-2:2006 (E)
5.2 Over temperature protection
5.2.1 Purpose
The purpose of this test is to determine whether the solar water heating system is protected against damage
and the user is protected from scalding hot water delivery after a period of no hot water draw and failure of
electrical power.
5.2.2 Apparatus
The following apparatus is required:
a) A pyranometer having the minimum characteristics specified in EN 12975-2, to measure the hemispherical
solar irradiance, or the short wave irradiance from a solar simulator lamp if the test is to be conducted inside
a solar simulator chamber.
b) Equipment to measure the temperature, flow rate and volume of hot wat
...
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