EN 12977-4:2012

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Thermische Solaranlagen und ihre Bauteile - Kundenspezifisch gefertigte Anlagen - Teil 4: Leistungsprüfung von Warmwasserspeichern für Solaranlagen zur Trinkwassererwärmung und Raumheizung (Kombispeicher)Installations solaires thermiques et leurs composants - Installations assemblées à façon - Partie 4 : Méthodes d'essai pour chauffe-eau solaires et installations solaires combinéesThermal solar systems and components - Custom built systems - Part 4: Performance test methods for solar combistores91.140.65Oprema za ogrevanje vodeWater heating equipment91.140.10Sistemi centralnega ogrevanjaCentral heating systems27.160Solar energy engineeringICS:Ta slovenski standard je istoveten z:EN 12977-4:2012SIST EN 12977-4:2012en,fr,de01-julij-2012SIST EN 12977-4:2012SLOVENSKI
STANDARDSIST-TS CEN/TS 12977-4:20101DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12977-4
April 2012 ICS 27.160 Supersedes CEN/TS 12977-4:2010English Version
Thermal solar systems and components - Custom built systems - Part 4: Performance test methods for solar combistores
Installations solaires thermiques et leurs composants - Installations assemblées à façon - Partie 4: Méthodes d'essai por chauffe-eau solaires et installations solaires combinés
Thermische Solaranlagen und ihre Bauteile - Kundenspezifisch gefertigte Anlagen - Teil 4: Leistungsprüfung von Warmwasserspeichern für Solaranlagen zur Trinkwassererwärmung und Raumheizung (Kombispeicher) This European Standard was approved by CEN on 19 February 2012.
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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
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COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
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B-1000 Brussels © 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12977-4:2012: ESIST EN 12977-4:2012

Store model benchmark tests . 17Annex B (normative)
Verification of store test results . 18Annex C (normative)
Benchmarks for the parameter identification . 19Annex D (informative)
Requirements for the numerical store model . 20Annex E (informative)
Determination of hot water comfort . 21Bibliography . 22 Tables Table 1 — Classification of combistores. 6Table 2 — Flow rates and store inlet temperatures for Test CD . 9Table 3 — Flow rates and store inlet temperatures for Test CI. 10Table 4 — Flow rates and store inlet temperatures for Test DD . 11Table 5 — Flow rates and store inlet temperatures for Test DI. 11 SIST EN 12977-4:2012

NOTE 3 For additional information about the test methods for the performance characterisation of stores see EN 12977-3 and [1] in Bibliography.
For symbols and abbreviations, refer to EN 12977-3:2012. 5 Store classification Solar combistores are classified by distinction between different charge and discharge modes. Five groups are defined as shown in Table 1. SIST EN 12977-4:2012

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 12977-3:2012, Figure 1 and Figure 2. An appropriate test facility consists of two charge loops as shown in EN 12977-3:2012, Figure 1 and two discharge loops as shown in EN 12977-3:2012, Figure 2. 6.1.2 Measuring data and measuring procedure The requirements specified in EN 12977-3:2012, 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 pair of charging and/or discharging inlet or outlet connections, then only one may be connected to the testing stand (at the same time) while the other(s) shall be closed. The pipes between the store and the temperature sensors shall be insulated according to EN 12828. SIST EN 12977-4:2012

Connections of the store which do not lead to the charge or discharge circuit of the testing stand shall be closed, and not connected heat exchangers shall be filled up with water. All closed connections shall be insulated in the same way as the store. Since fluid in closed heat exchangers expands with increasing temperature, a pressure relief valve shall be mounted.
NOTE The performance of a solar heating system depends on the individual installation and actual boundary conditions. With regard to the heat losses of the store besides deficits in the thermal insulation, badly designed connections can increase the heat loss capacity rate of the store due to natural convection that occurs internally in the pipe. In order to avoid this effect, the connections of the pipes should be designed in such a way that no natural convection inside the pipe occurs. This can be achieved if the pipe is directly going downwards after leaving the store or by using a heat trap siphon.
6.3 Test and evaluation procedures 6.3.1 General The aim of store testing as specified in this document is to determine parameters required for the detailed description of the thermal behaviour of a hot water combistore. Therefore, a mathematical computer model for the store is necessary. The basic requirements on suitable models are specified in Annex A and Annex B. The following parameters shall be known for the simulation of a store being part of a solar system. a) Stored water: 1) height; 2) effective volume respectively effective thermal capacity; 3) heights of the inlet and outlet connections; 4) heat loss capacity rate of the entire store; 5) if the insulation varies for different heights of the store, the distribution of the heat loss capacity rate should be determined for the different parts of the store; 6) a parameter describing the degradation of thermal stratification during stand-by; NOTE 1 One possible way to describe this effect in a store model is the use of a vertical thermal conduction. In this case, the corresponding parameter is an effective vertical thermal conductivity.
7) a parameter describing the characteristic of thermal stratification during direct discharge; NOTE 2 An additional parameter may be used to describe the influence of different draw-off flow rates on the thermal stratification inside the store, if this effect is relevant. 8) positions of the temperature sensors (e.g. the sensors of the collector loop and auxiliary heater control). SIST EN 12977-4:2012
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