BS EN 15332-2007 Heating boilers - Energy assessment of hot water storage systems《加热锅炉 热水储存系统的能量评估》.pdf

1、BRITISH STANDARDBS EN 15332:2007Heating boilers Energy assessment of hot water storage systemsThe European Standard EN 15332:2007 has the status of a British StandardICS 91.140.65g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g

2、54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 15332:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2007 BSI 2007ISBN 978 0 580 55785 9National forewordThis British Standard is the UK imp

3、lementation of EN 15332:2007. The UK participation in its preparation was entrusted to Technical Committee RHE/10, Heating boilers.A list of organizations represented on this committee can be obtained on request to its secretary.This British Standard (BS EN 15332) is one method of assessing the perf

4、ormance of an indirectly heated hot water system comprising of a heating boiler and hot water storage cylinder and where there is a known relationship between the cylinder and the heating boiler. The system is assessed with boiler input occurring during draw off which is not normal UK practice for t

5、ypical family domestic premises. A more suitable methodolody for the assessment and performance comparison of indirectly heated unvented cylinders in domestic premises is contained in BS EN 12897.This publication does not purport to include all the necessary provisions of a contract. Users are respo

6、nsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 15332November 2007ICS 91.140.65English VersionHeating boilers - Energy assess

7、ment of hot water storagesystemsChaudires de chauffage - Evaluation de la performancenergtique des prparateurs deau chaudeHeizkessel - Energetische Bewertung vonWarmwasserspeichersystemenThis European Standard was approved by CEN on 22 March 2007.CEN members are bound to comply with the CEN/CENELEC

8、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 m

9、ember.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 member

10、s 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, Swit

11、zerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement 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

12、15332:2007: EEN 15332:2007 (E) 2 Contents Page Foreword3 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 capac

13、ity with known heat exchanger performance 9 4.4 Measuring the hot water capacity10 5 Measurements10 5.1 Connection of the storage 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

14、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 standar

15、d, 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

16、 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, Switz

17、erland 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

18、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, o

19、nly 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 f

20、ollowing 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

21、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 ctemperature at the entr

22、ance of the hot water side of the storage tank in C 3.5 temperature of the warm water 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 betw

23、een the temperature of the warm water w= 45 C minus the temperature of cold water c= 10 C (u= w c= 35 K). 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 mediu

24、m temperature at the outlet of the heating side of the water 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 accordi

25、ng to 5.4.1 3.11 storage excess temperature xtemperature difference 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 l

26、oading mass flow mlflow of heating medium through the heating 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

27、EN 15332:2007 (E) 6 3.17 hot water capacity 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

28、 Pecontinuous transferable heat power from 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

29、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 c3.21 cycle time time interval of the data acquisition in s 3.22 nominal operating conditions index n operation conditions resulting from the measuremen

30、t 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 again

31、st 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 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

32、storage tanks based on the hot water capacity 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) wher

33、e 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; Q

34、L(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 b

35、e 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 actual storage capacity If no measurement has been taken, the behaviour of the storage tank shall be assumed to be fully mixing. This mea

36、ns 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 water storage capacity

37、 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, the hot water capacity

38、 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 diagram in Figure 2 is based

39、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). EN 15332:2007 (E) 10 4.4 Measuring the hot water capacity The hot water capacity shall be measured according to

40、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 connected to the heat source as indicated by

41、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 heating medium supply and return temperature

42、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 a way that the temperature difference betwe

43、en 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= (50 1) K. The steady-state condition shall

44、 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 flow of the warmed up water, rise in temperat

45、ure 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 fluctuate during the test by more than 1 K. All giv

46、en 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 as loaded when the loading controller switc

47、hes 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). EN 15332:2007 (E) 11 5.3.2 Preparation The storage tank shall be connected to

48、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 controller with a two point behaviour and a switching difference of m

49、ax. 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 logged 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