1、January 2008DEUTSCHE NORM English price group 10No part of this standard may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 91.140.65!$Ki“1409270w
2、ww.din.deDDIN EN 15332Heating boilers Energy assessment of hot water storage systemsEnglish version of DIN EN 15332:2008-01Heizkessel Energetische Bewertung von WarmwasserspeichersystemenEnglische Fassung DIN EN 15332:2008-01www.beuth.deDocument comprises 17 pagesDIN EN 15332:2008-01 2 National fore
3、word This standard has been prepared by Technical Committee CEN/TC 57 “Central heating boilers” (Secretariat: DIN, Germany). The responsible German body involved in its preparation was the Normenausschuss Heiz- und Raumluft-technik (Heating and Ventilation Technology Standards Committee), Technical
4、Committee NA 041-01-62 AA Zentralheizungskessel. EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 15332November 2007ICS 91.140.65English VersionHeating boilers - Energy assessment of hot water storagesystemsChaudires de chauffage - Evaluation de la performancenergtique des prparateurs deau chaudeHe
5、izkessel - 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 witho
6、ut 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 ma
7、de 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,
8、 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 STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUN
9、GManagement Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 15332:2007: EEN 15332:2007 (E) 2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Req
10、uirements 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 capacity10 5 Measurements10 5.1 Connection of the st
11、orage tank10 5.2 Measurement of the heat exchanger performance 10 5.3 Measurement of the hot water capacity 10 5.4 Measurement of the standby-loss13 6 Requirements on the test rig 15 6.1 Environment.15 6.2 Measuring accuracy 15 DIN EN 15332:2008-01 EN 15332:2007 (E) 3 Foreword This document (EN 1533
12、2:2007) 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 conflic
13、ting 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, Estoni
14、a, 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. DIN EN 15332:2008-01 EN 15332:2007 (E) 4 1 Scope This European Standard spec
15、ifies 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 Stand
16、ard, 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 r
17、eferenced 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
18、 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
19、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 ctemperature at the entrance of the hot water side of the storage tank in C 3.5 temperature of the warm wa
20、ter w temperature at the outlet of the hot water side in C 3.6 usable hot water temperature uminimum 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 w= 45 C minus the temperature of cold water
21、c= 10 C (u= w c= 35 K). DIN EN 15332:2008-01 EN 15332:2007 (E) 5 3.7 heating medium supply temperature hheating medium temperature at the entrance of the heating side of the water heater 3.8 heating medium return temperature rheating medium temperature at the outlet of the heating side of the water
22、heater 3.9 storage temperature stemperature of the storage tank measured at the thermostat position, which is intended for this purpose 3.10 ambient temperature atemperature in the environment of the hot water storage tank measured according to 5.4.1 3.11 storage excess temperature xtemperature diff
23、erence between the storage temperature and the ambient temperature: asx = 3.12 tapping volume flow Vwflow of warm water through the hot water side in l/s 3.13 tapping mass flow mwflow of warm water through the hot water side in kg/h 3.14 loading mass flow mlflow of heating medium through the heating
24、 side in kg/h 3.15 rated storage capacity CRcapacity of the storage tank assigned by the manufacturer in l 3.16 actual storage capacity CAwater content of the hot water and the heating side determined by volume measuring or balancing in l DIN EN 15332:2008-01 EN 15332:2007 (E) 6 3.17 hot water capac
25、ity CUquantity of hot water in litre at usable hot water temperature uwhich could be tapped at one 10 min tapping at a cold water temperature of c= 10 C and a maximum hot water temperature of w=65 C (w= w c= 55 K) with reheating 3.18 heat exchanger performance Pecontinuous transferable heat power fr
26、om the heating side to the hot water side in kW at standard conditions of c= 10 C, w= 60 C and h= 80 C 3.19 standby loss QBenergy loss in kWh/d at nominal storage temperature against environment with an ambient temperature of a= 20 C, but at least 45 K excess temperature 3.20 cold condition conditio
27、n at which the temperature in no side of the storage tank is more than 10 K over the cold water temperature c3.21 cycle time 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 nomi
28、nal 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 F
29、igure 1. DIN EN 15332:2008-01 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 Cuin 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
30、 on the hot water capacity DIN EN 15332:2008-01 EN 15332:2007 (E) 8 The maximal standby loss QB,maxfor 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 = (231_UmaxB,5,52(n) CQLQ = (3) wh
31、ere QB,maxis the maximal standby loss in kWh/d; CRis the rated storage capacity in l; CAis the actual storage capacity in l; CUis 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;
32、 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
33、 be measured according to 5.4 or any other method which is proven to give the equivalent results. DIN EN 15332:2008-01 EN 15332:2007 (E) 9 4.2 Estimating the hot water capacity from the actual storage capacity If no measurement has been taken, the behaviour of the storage tank shall be assumed to be
34、 fully mixing. This means that under the conditions of cold water temperature c= 10 C, usable hot water temperature u= 45 C, storage temperature after loading s= 65 C the hot water capacity Cucan only achieve 4/7 of the actual storage capacity. If the heat exchanger performance is not known, the hot
35、 water storage capacity shall be determined as the intersection of actual storage capacity line and y-axis in Figure 2. 4.3 Estimating the hot water capacity with known heat exchanger performance If the heat exchanger performance is measured according to 5.2 and assuming a fully mixing storage tank,
36、 the hot water capacity could be calculated with the actual storage capacity as shown in Figure 2: Key Y hot water capacity Cuin litres X heat exchanger performance Pe in kW Figure 2 Hot water capacity calculated with actual storage capacity of up to 1 000 l and heat exchanger performance The diagra
37、m in Figure 2 is based on Equation (4): ()1,47474EAwuwtEAu+=+= PCcPCC (4) where cWis the specific heat capacity of water (constant 4,18 kJ/kg K); tis the tapping time (600 s); wis the density of water (1 kg/l). DIN EN 15332:2008-01 EN 15332:2007 (E) 10 4.4 Measuring the hot water capacity The hot wa
38、ter capacity shall be measured according to 5.3 or according to EN 12897. NOTE Other methods can be used if these methods give equivalent results. 5 Measurements 5.1 Connection of the storage tank The storage tank shall be tested with the accessories it is delivered with. The storage tank shall be c
39、onnected to the heat source as indicated by the manufacturer. If the water heater has a circulation connection, it shall be closed. 5.2 Measurement of the heat exchanger performance The heat exchanger performance shall be measured under continuous operation. The cold and hot water temperature, the h
40、eating medium supply and return temperature and the heating medium mass flow mlor the warm water mass flow mwshall be measured. If the mass flow is not given by the manufacturer, the heat supply to the water heater and the mass flow of the warm water and the heating medium shall be regulated in such
41、 a way that the temperature difference between heating medium supply temperature and cold water temperature is h c= (70 2) K, the temperature difference between heating medium supply and return temperature is h r= (20 1) K and the temperature difference between warm and cold water temperature is w c
42、= (50 1) K. The steady-state condition shall be considered as reached, if the mass flow does not vary more than (1 % + 1 kg/s), and the temperatures no more than 0,2 K around the measured average value of 10 measured values taken up within 10 min. The heat performance Pein kW results as product of f
43、low of the warmed up water, rise in temperature and specific heat capacity of the water according to Equation (5): ()36001cwwwe= cmP in kW. (5) 5.3 Measurement of the hot water capacity 5.3.1 General The cold water temperature for the test can be between c= 8 C to 18 C, but is not allowed to fluctua
44、te during the test by more than 1 K. All given temperatures refer to a cold water temperature of c= 10 C. If the cold water temperature differs, the measurement has to take place with the according temperature differences which are given in brackets named with = c. The storage tank shall be regarded
45、 as loaded when the loading controller switches off. The hot water temperature shall never exceed w,max= 65 C ( w,max= 55 K). The storage tank shall be regarded as empty when the hot water temperature falls below the usable hot water temperature u= 45 C ( u= 35 K). DIN EN 15332:2008-01 EN 15332:2007
46、 (E) 11 5.3.2 Preparation The storage tank shall be connected to a heat source. The heating supply temperature shall be limited to h c= (70 2) K. The supply mass flow shall be set to the value determined in 5.2. The heat generator shall be switched on and off together with the pump by a loading cont
47、roller with a two point behaviour and a switching difference of max. 5 K shall be used. The controller sensor shall be positioned in the tank thermostat pocket, which is provided for this purpose. 5.3.3 Procedure The temperature gradient of cold and warm water and the warm water mass flow shall be l
48、ogged during the measurement tapping within an interval of max. 10 s. The measurement cycle shall consist of at least three tappings: at least two pre-tappings and one measurement tapping. The tapping volume flow Vwfor all tappings shall be set at such a level that the tank is emptied during the mea
49、surement tapping within (10 1) min. The setting of the right tapping volume flow may require a number of iteration loops. The tapping volume flow shall not be changed during the measurement. If the storage tank could not be emptied within 10 min due to temperature or volume flow restrictions (e.g. instantaneous heating of the hot water), the volume flow shall be set to the highest possible value. The storage tank shall be firs
