SIST EN 15332:2008

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Heating boilers - Energetic assessment of hot water storage tanksKotli za gretje - Energetsko ocenjevanje hranilnikov tople vodeChaudieres de chauffage - Evaluation de la performance énergétique des préparateurs d'eau chaudeHeizkessel - Energetische Bewertung von WarmwasserspeichernTa slovenski standard je istoveten z:EN 15332:2007SIST EN 15332:2008en,fr,de91.140.65Oprema za ogrevanje vodeWater heating equipmentICS:SLOVENSKI
STANDARDSIST EN 15332:200801-januar-2008







EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 15332November 2007ICS 91.140.65 English VersionHeating boilers - Energy assessment of hot water storagesystemsChaudières de chauffage - Evaluation de la performanceénergétique des préparateurs d'eau chaudeHeizkessel - Energetische Bewertung vonWarmwasserspeichersystemenThis European Standard was approved by CEN on 22 March 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, 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 STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2007 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 15332:2007: E



EN 15332:2007 (E) 2 Contents Page Foreword.3 1 Scope.4 2 Normative references.4 3 Terms and definitions.4 4 Requirements on the hot water storage tanks.6 4.1 Energy assessment.6 4.2 Estimating the hot water capacity from the actual storage capacity.9 4.3 Estimating the hot water capacity with known heat exchanger performance.9 4.4 Measuring the hot water capacity.10 5 Measurements.10 5.1 Connection of the storage tank.10 5.2 Measurement of the heat exchanger performance.10 5.3 Measurement of the hot water capacity.10 5.4 Measurement of the standby-loss.13 6 Requirements on the test rig.15 6.1 Environment.15 6.2 Measuring accuracy.15



EN 15332:2007 (E) 3 Foreword This document (EN 15332:2007) has been prepared by Technical Committee CEN/TC 57 “Central heating boilers”, the secretariat of which is held by DIN. 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 May 2008, and conflicting national standards shall be withdrawn at the latest by May 2008. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard : Austria, Belgium, Bulgaria, 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.



EN 15332:2007 (E) 4 1 Scope This European Standard specifies a method for the energy assessment of a domestic hot water system comprising an external heating boiler of specified minimum output indirectly heating an unvented (closed) hot water tank of up to 1 500 l. Whilst tanks intended primarily for direct heating are not covered by this European Standard, it does allow the provision of electric heating elements for auxiliary use. 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 12897, Water supply — Specification for indirectly heated unvented (closed) storage water heaters 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 indirectly heated un-vented (closed) hot water storage tanks storage vessels used for heating up domestic hot water with an external heat source where the hot water side is not vented to atmosphere, including all devices delivered with it 3.2 hot water side side of the storage tank which contains domestic hot water NOTE If a mixing valve is delivered with the storage tank, it is considered as part of the hot water side. 3.3 heating side side of the storage tank which contains the heating medium 3.4 temperature of the cold water ϑϑϑϑc temperature at the entrance of the hot water side of the storage tank in °C 3.5 temperature of the warm water ϑϑϑϑw
temperature at the outlet of the hot water side in °C 3.6 usable hot water temperature ϑϑϑϑu minimum temperature for the hot water to be usable
NOTE Minimum temperature for the hot water defined here as difference between the temperature of the warm water ϑw = 45 °C minus the temperature of cold water ϑc = 10 °C (ϑu = ϑw – ϑc = 35 K).



EN 15332:2007 (E) 5 3.7 heating medium supply temperature ϑϑϑϑh heating medium temperature at the entrance of the heating side of the water heater 3.8 heating medium return temperature ϑϑϑϑr heating medium temperature at the outlet of the heating side of the water heater 3.9 storage temperature ϑϑϑϑs temperature of the storage tank measured at the thermostat position, which is intended for this purpose 3.10 ambient temperature ϑϑϑϑa temperature in the environment of the hot water storage tank measured according to 5.4.1 3.11 storage excess temperature ∆∆∆∆ϑϑϑϑx temperature difference between the storage temperature and the ambient temperature: asxϑϑϑ∆−= 3.12 tapping volume flow Vw flow of warm water through the hot water side in l/s 3.13 tapping mass flow mw flow of warm water through the hot water side in kg/h 3.14 loading mass flow ml flow of heating medium through the heating side in kg/h 3.15 rated storage capacity CR capacity of the storage tank assigned by the manufacturer in l 3.16 actual storage capacity CA water content of the hot water and the heating side determined by volume measuring or balancing in l



EN 15332:2007 (E) 6 3.17 hot water capacity CU quantity of hot water in litre at usable hot water temperature ϑu which could be tapped at one 10 min tapping at a cold water temperature of ϑc = 10 °C and a maximum hot water temperature of ϑw =65 °C (∆ϑw = ϑw – ϑc = 55 K) with reheating 3.18 heat exchanger performance Pe continuous transferable heat power from the heating side to the hot water side in kW at standard conditions of ϑc = 10 °C, ϑw = 60 °C and ϑh = 80 °C 3.19 standby loss QB energy loss in kWh/d at nominal storage temperature against environment with an ambient temperature of ϑa = 20 °C, but at least 45 K excess temperature 3.20 cold condition condition at which the temperature in no side of the storage tank is more than 10 K over the cold water temperature ϑc
3.21 cycle time ∆∆∆∆ττττ time interval of the data acquisition in s 3.22 nominal operating conditions index n operation conditions resulting from the measurement or given by the manufacturer 3.23 nominal storage temperature temperature of the stored water in the tank as measured by the thermostat 4 Requirements on the hot water storage tanks 4.1 Energy assessment For the energy assessment of the hot water storage tank, the standby loss shall be rated against the hot water capacity according to Figure 1.



EN 15332:2007 (E) 7
a)
b) Key Y standby loss related to the hot water capacity in (Wh/l)/d X hot water capacity Cu in litres A to F coefficient for the rational use of energy, see explanation to the Equations (1) to (3) Figure 1 — Labelling of hot water storage tanks based on the hot water capacity



EN 15332:2007 (E) 8 The maximal standby loss QB,max for the different quality levels shall be calculated according to Equations (1) to (3) depending by the used method:
31_RmaxB,5,52(n)CQLQ××= (1) 31_AmaxB,5,52(n)CQLQ××= (2) 31_UmaxB,5,52(n)CQLQ××= (3) where QB,max is the maximal standby loss in kWh/d; CR
is the rated storage capacity in l; CA
is the actual storage capacity in l; CU
is the hot water capacity in l; QL(n) is the coefficient for rational use of energy, see Figure 1 with n from A to F QL(A) = 0,75; QL(B) = 0,875; QL(C) = 1,0; QL(D) = 1,125; QL(E) = 1,25; QL(F) = 1,375. The hot water capacity depends on the construction of the storage tank. The hot water capacity could be:  estimated with the real storage volume (4.2);  estimated with the real storage volume and the heat exchanger performance (4.3);  measured (4.4). The standby loss shall be measured according to 5.4 or any other method which is proven to give the equivalent results.



EN 15332:2007 (E) 9 4.2 Estimating the hot water capacity from the
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