SIST-TS CEN/TS 12977-4:2010

SLOVENSKI STANDARD
01-september-2010
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Thermal solar systems and components - Custom built systems - Part 4: Performance
test methods for solar combistores
Thermische Solaranlagen und ihre Bauteile - Kundenspezifisch gefertigte Anlagen - Teil
4 Leistungsprüfung von Warmwasserspeichern für Solaranlagen zur
Trinkwassererwärmung und Raumheizung
Installations solaires thermiques et leurs composants - Installations personnalisées -
Partie 4: Méthodes d'essai de performances des dispositifs de stockage mixtes pour des
installations de chauffage solaires
Ta slovenski standard je istoveten z: CEN/TS 12977-4:2010
ICS:
27.160 6RQþQDHQHUJLMD Solar energy engineering
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
91.140.65 Oprema za ogrevanje vode Water heating equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL SPECIFICATION
CEN/TS 12977-4
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
April 2010
ICS 27.160
English Version
Thermal solar systems and components - Custom built systems
- Part 4: Performance test methods for solar combistores
Installations solaires thermiques et leurs composants - Thermische Solaranlagen und ihre Bauteile -
Installations personnalisées - Partie 4: Méthodes d'essai de Kundenspezifisch gefertigte Anlagen - Teil 4:
performances des dispositifs de stockage mixtes pour des Leistungsprüfung von Warmwasserspeichern für
installations de chauffage solaires Solaranlagen zur Trinkwassererwärmung und
Raumheizung (Kombispeicher)
This Technical Specification (CEN/TS) was approved by CEN on 9 September 2008 for provisional application.

The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to submit their
comments, particularly on the question whether the CEN/TS can be converted into a European Standard.

CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS available
promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in parallel to the CEN/TS)
until the final decision about the possible conversion of the CEN/TS into an EN is reached.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, 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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EUROPÄISCHES KOMITEE FÜR NORMUNG

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© 2010 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 12977-4:2010: E
worldwide for CEN national Members.

Contents Page
Foreword .3
Introduction .4
1 Scope .5
2 Normative references .5
3 Terms and definitions .5
4 Symbols and abbreviations .5
5 Store classification .5
6 Laboratory store testing .6
6.1 Requirements on the testing stand .6
6.1.1 General .6
6.1.2 Measuring data and measuring procedure .6
6.2 Installation of the store .6
6.2.1 Mounting .6
6.2.2 Connection .6
6.3 Test and evaluation procedures .7
6.3.1 General .7
6.3.2 Test sequences .8
6.3.3 Data processing of the test sequences . 11
7 Test report . 13
7.1 General . 13
7.2 Description of the store . 13
7.3 Test results . 14
7.4 Parameters for the simulation . 15
Annex A (normative) Store model benchmark tests . 16
Annex B (normative) Verification of store test results . 17
Annex C (normative) Benchmarks for the parameter identification . 18
Annex D (informative) Requirements for the numerical store model . 19
Annex E (informative) Determination of hot water comfort . 20
E.1 General . 20
Bibliography . 21

Tables
Table 1 — Classification of combistores. 5
Table 2 — Flow rates and store inlet temperatures for Test CD . 9
Table 3 — Flow rates and store inlet temperatures for Test CI. 10
Table 4 — Flow rates and store inlet temperatures for Test DD . 10
Table 5 — Flow rates and store inlet temperatures for Test DI. 11
Foreword
This document (CEN/TS 12977-4:2010) has been prepared by Technical Committee CEN/TC 312 “Thermal
sorla systems and components”, the secretariat of which is held by ELOT.
Attention is drawn to the possibility that 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 announce this Technical Specification: Austria, Belgium, Bulgaria, Croatia, 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 the United Kingdom.
Introduction
The test methods for stores of solar heating systems as described in this document are required for the
determination of the thermal performance of small custom built systems for combined domestic hot water
preparation and space heating, so-called solar combisystems, as specified in CEN/TS 12977-1.
These test methods deliver parameters, which are needed for the simulation of the thermal behaviour of a
store being part of a small custom built system.
NOTE 1 With the test methods for stores given in EN 12897 only a few parameters are determined in order to
characterise the thermal behaviour of a store. These few parameters are not sufficient for the determination of the thermal
performance of small custom built systems as described in CEN/TS 12977-2.
NOTE 2 The already existing test methods for stores of conventional heating systems are not sufficient with regard to
thermal solar systems. This is due to the fact that the performance of thermal solar systems depends much more on the
thermal behaviour of the store (e.g. stratification, heat losses), as conventional systems do. Hence this separate document
for the performance characterisation of stores for solar heating systems is needed.
NOTE 3 For additional information about the test methods for the performance characterisation of stores see
EN 12977-3 and [1] in Bibliography.
1 Scope
This Technical Specification specifies test methods for the performance characterization of stores which are
intended for use in small custom built systems as specified in CEN/TS 12977-1.
Stores tested according to this document are commonly used in solar combisystems. However, also the
thermal performance of all other thermal stores with water as storage medium (e.g. for heat pump systems)
can be assessed according to the test methods specified in this document.
This document applies to combisstores with a nominal volume up to 3 000 l and without integrated burner.

NOTE This document is extensively based on references to EN 12977-3:2008.
2 Normative references
The following referenced documents are indispensable for the application 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 12828, Heating systems in buildings — Design for water-based heating systems
EN 12977-3:2008, Thermal solar systems and components — Custom built systems — Part 3: Performance
test methods for solar water heater stores
EN ISO 9488:1999, Solar energy — Vocabulary (ISO 9488:1999)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 12977-3:2008 and
EN ISO 9488:1999 apply.
4 Symbols and abbreviations
For symbols and abbreviations refer to EN 12977-3.
5 Store classification
Solar combistores are classified by distinction between different charge and discharge modes. Five groups
are defined as shown in Table 1.
Table 1 — Classification of combistores
Group Charge mode Discharge mode
1 direct direct
2 indirect direct
3 direct indirect
4 indirect indirect
5 stores that cannot be assigned to groups 1 to 4
NOTE 1 All stores may have one or more additional electrical heating elements.
NOTE 2 Stores that can be charged or discharged directly and indirectly (e.g. a store of a space heating system with
an internal heat exchanger for the preparation of domestic hot water) can belong to more than one group. In this case the
appropriate test procedures or the assignment to one of the groups respectively, should be chosen depending on its mode
of operation.
6 Laboratory store testing
6.1 Requirements on the testing stand
6.1.1 General
The hot water store shall be tested separately from the whole solar system on a store testing stand.
The testing stand configuration shall be determined by the classification of the combistores as described in
Clause 5.
An example of a representative hydraulic testing stand configuration is shown in EN 12977-3:2008, Figure 1
and Figure 2. An appropriate test facility consists of two charge loops as shown in EN 12977-3:2008, Figure 1
and two discharge loops as shown in EN 12977-3:2008, Figure 2.
6.1.2 Measuring data and measuring procedure
The requirements specified in EN 12977-3:2008, 6.1.2 shall be fulfilled.
6.2 Installation of the store
6.2.1 Mounting
The store shall be mounted on the testing stand according to the manufacturer's instructions.
The temperature sensors used for measuring the inlet and outlet temperatures of the fluid used for charging
and discharging the storage device, shall be placed as near as possible at least 200 mm to the inlet and outlet
connections of the storage device. The installation of the temperature sensors inside the pipes shall be done
according to approved methods of measuring temperatures.
If there is/are more than one
...