oSIST prEN 12977-3:2006

SLOVENSKI STANDARD
01-november-2006
7RSORWQLVRQþQLVLVWHPLLQVHVWDYQLGHOL1HVHULMVNRL]GHODQLVLVWHPLGHO
'RORþDQMHSUHVNXVQLKPHWRG]DKUDQLOQLNHWRSORWHRJUHYDQHVVRQFHP
Thermal solar systems and components - Custom built systems - Part 3: Performance
characterisation of stores for solar heating systems
Ta slovenski standard je istoveten z: prEN 12977-3
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.

EUROPEAN STANDARD
DRAFT
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2006
ICS 91.140.10; 91.140.65; 27.160 Will supersede ENV 12977-3:2001
English Version
Thermal solar systems and components - Custom built systems
- Part 3: Performance test methods for solar water heater stores
Installations solaires thermiques et leurs composants - Thermische Solaranlagen und ihre Bauteile -
Installations assemblées à façon - Partie 3: Méthodes Kundenspezifisch gefertigte Anlagen - Teil 3:
d'essai des performances des dispositifs de stockage des Leistungsprüfung von Warmwasserspeichern für
installations de chauffage solaire de l'eau Solaranlagen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 312.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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, 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.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
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. prEN 12977-3:2006: E
worldwide for CEN national Members.

Contents Page
Foreword.4
Introduction .4
1 Scope.4
2 Normative references.4
3 Terms and definitions .5
4 Symbols and abbreviations .9
5 Store classification.10
6 Laboratory store testing.10
6.1 Requirements on the testing stand.10
6.1.1 General.10
6.1.2 Measured quantities and measuring procedure.14
6.2 Installation of the store .15
6.2.1 Mounting.15
6.2.2 Connection.15
6.3 Test and evaluation procedures.15
6.3.1 Test sequences.17
6.3.2 Data processing of the test sequences.28
7 Store test combined with a system test according to ISO 9459-5.29
8 Test report.29
8.1 General.29
8.2 Description of the store .30
8.3 Test results.31
8.4 Parameters for the simulation.31
Annex A (normative) Requirements for the numerical store model .33
A.1 General.33
A.2 Assumptions.33
A.3 Energy balance.33
Annex B (normative) Store model benchmark tests .35
B.1 General.35
B.2 Temperature of the store during stand-by .35
B.3 Heat transfer from heat exchanger to store.35
Annex C (normative) Benchmarks for the parameter identification .37
Annex D (informative) Verification of store test results.38
D.1 General.38
D.2 Test sequences for verification of store test results .38
D.2.1 Verification sequences from measurements on a store testing stand .38
D.2.2 Test sequences obtained during a whole system test according ISO 9459-5 .45
D.3 Verification procedure.45
D.3.1 General.45
D.3.2 Error in transferred energies .45
D.3.3 Error in transferred power .46
Annex E (informative) Determination of store parameters by means of “up-scaling” and “down-
scaling”.47
E.1 General.47
E.2 Requirements.47
E.3 Determination of store parameters.48
E.3.1 Thermal capacity of store.48
E.3.2 Height of store .48
E.3.3 Determination of heat loss capacity rate .48
E.3.4 Relative heights of the connections and the temperature sensors .48
E.3.5 Heat exchangers.48
E.3.6 Parameter describing the degradation of thermal stratification during stand-by.49
E.3.7 Parameter describing the quality of thermal stratification during direct discharge .49
Annex F (informative) Determination of hot water comfort.50
F.1 General.50
Bibliography.51

Foreword
This document (prEN 12977-3:2006) has been prepared by Technical Committee CEN/TC 312 “Thermal solar
systems and components”, the secretariat of which is held by ELOT.
This document is currently submitted to the CEN Enquiry.
This document will supersede ENV 12977-3:2001.
The annexes A, B, C are normative and annexes D and E are informative.
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 as specified in prEN/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 thermal solar system.
NOTE 1 The already existing test methods for stores of solar 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 2 For additional information about the test methods for the performance characterisation of stores see [1] in
Bibliography.
1 Scope
This document (prEN 12977-3:2006) specifies test methods for the performance characterization of stores
which are intended for use in small custom built systems as specified in prEN/TS 12977-1.
Stores tested according to this document are commonly used in solar hot water systems. However, also the
thermal performance of all other thermal stores with water as storage medium can be assessed according to
the test methods specified in this document.
The document applies to stores with a nominal volume between 50 l and 3 000 l.
This document does not apply to combistores. Performance test methods for solar combistores are specified
in prEN/TS 12977-4.
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 806-1, Specifications for installations inside buildings conveying water for human consumption — Part 1:
General
EN 1717, Protection against pollution of potable water installations and general requirements of devices to
prevent pollution by backflow
EN 12828, Heating systems in buildings — Design of water-based heating systems
EN 12976-2, Thermal solar systems and components — Factory made systems — Test methods
prEN/TS 12977-1, Thermal solar systems and components — Custom built systems — Part 1: General
requirements for solar water heaters and combi systems
prEN/TS 12977-2, Thermal solar systems and components — Custom built systems — Part 2: Test methods
for solar water heaters and combi systems
prEN/TS 12977-4, Thermal solar systems and components — Custom built systems — Part 4: Performance
test methods for solar combistores
EN ISO 9488, Solar energy — V
...