1、BRITISH STANDARD BS EN 835:1995 Heat cost allocators for the determination of the consumption of room heating radiators Appliances without an electrical energy supply, based on the evaporation principle The European Standard EN 835:1994 has the status of a British StandardBSEN835:1995 This British S
2、tandard, having been prepared under the directionof the ElectrotechnicalSector Board,was published under theauthority of the StandardsBoard and comesinto effect on 15August1995 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference CPL/30 Draft for comment
3、92/04219 DC ISBN 0 580 24277 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee CPL/30, Measurement of fluid flow in closed circuits, upon which the following bodies were represented: British Compressed Air Society British
4、 Gas plc Department of Energy (Gas and Oil Measurement Branch) Department of Trade and Industry (National Engineering Laboratory) Electricity Industry in UnitedKingdom Energy Industries Council GAMBICA (BEAMA Ltd.) Institute of Measurement and Control Institute of Petroleum Institute of Trading Stan
5、dards Administration Institution of Gas Engineers Institution of Mechanical Engineers Society of British Gas Industries Water Services Association of England and Wales Amendments issued since publication Amd. No. Date CommentsBSEN835:1995 BSI 12-1999 i Contents Page Committees responsible Inside fro
6、nt cover National foreword ii Foreword 2 Text of EN 835 5BSEN835:1995 ii BSI 12-1999 National foreword This British Standard has been prepared by Technical Committee CPL/30. It is the English language version of EN835:1994 Heat cost allocators for the determination of the consumption of room heating
7、 radiators Appliances without an electrical energy supply, based on the evaporation principle, published by the European Committee for Standardization (CEN). The foreword of the European Standard makes reference to the date of withdrawal of conflicting national standards. In this case no such nation
8、al standard exists. Product certification. Users of this British Standard are advised to consider the desirability of third party certification of product conformity with this British Standard based on testing and continuing surveillance, which may be coupled with assessment of a suppliers quality s
9、ystems against the appropriate standard in the BS EN ISO9000 series. Enquiries as to the availability of the third party certification schemes are forwarded by BSI to the Association of British Certification Bodies. If a third party certification scheme does not already exist, users should consider
10、approaching an appropriate body from the list of Association members. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immu
11、nity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 16 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the a
12、mendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 835 October 1994 ICS 91.140.10 Descriptors: Metrology, buildings, heating, energy consumption, measuring instruments, temperature measuring instruments, recording apparatus, definitions, equipment, specific
13、ations, performance evaluation, installation, inspection English version Heat cost allocators for the determination of the consumption of room heating radiators Appliances without an electrical energy supply, based on the evaporation principle Rpartiteurs de frais de chauffage pour enregistrer les v
14、aleurs de consommation de surfaces de corps de chauffe Appareils sans alimentation en nergie lectrique en vertu du principe dvaporation Heizkostenverteiler fr die Verbrauchswerterfassung von Raumheizflchen Gerte ohne elektrische Energieversorgung nach dem Verdundtungsprinzip This European Standard w
15、as approved by CEN on1994-10-14. 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 nation
16、al standards may be obtained on application to the Central Secretariat or to any CEN member. The European Standards exist in three official version (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notifi
17、ed to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom.
18、CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1994 Copyright reserved to CEN members Ref. No. EN 835:1994 EEN835:1994 BSI 12-1999 2 Foreword This European Standard has been prepared by
19、 Technical Committee CEN/TC171, Heat cost allocation, the secretariat of which is held by DIN. This standard includes two informativeAnnex A andAnnex B. These parts of the standard are not binding. This European Standard shall be given the status of a national standard, either by publication of an i
20、dentical text or by endorsement, at the latest by April1995, and conflicting national standards shall be withdrawn at the latest by April1995. According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland,
21、 France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, UnitedKingdom. Contents Page Foreword 2 1 Introduction 5 2 Scope and general terms 5 3 Functional principle 5 4 Definitions 6 4.1 Reference condition 6 4.2 Reference temperature
22、of the measuring liquid 6 4.3 Design flow and return temperatures, mean design heating medium temperature, design temperature of the measuring liquid 6 4.4 Displayed reading 6 4.5 Rated displayed reading 6 4.6 Nominal evaporation 6 4.7 Evaporation rate 6 4.8 Counting rate 7 4.9 Meter characteristic
23、7 4.10 Counting ratio 7 4.11 Consumption scale 7 4.12 Unit scale 7 4.13 Idle evaporation 7 4.14 Measuring period 7 4.15 c-value 7 4.16 Rating factors 8 4.17 Manufacturer 8 5 Requirements for heat cost allocators 8 5.1 Casing 8 5.2 Ampoule 8 5.3 Measuring liquid 8 5.4 Over-fill for idle evaporation 8
24、 5.5 Sealing 9 5.6 Scale system 9 5.7 Consumption scale 9 5.8 Unit scale 9 6 Requirements for use and installation 9 6.1 Temperature limits 9 6.2 Installation on the radiator 10 6.3 Installation position 10 6.4 Conformity of instruments 11 6.5 Requirements for installation in single pipe systems 11
25、7 Requirements for rating 11 7.1 Resulting rating factor K 11EN835:1994 BSI 12-1999 3 Page 7.2 Rating factor K Q 11 7.3 Rating factor K C 11 7.4 c-value 11 7.5 Rating factor K T 11 8 Requirements for maintenance and reading 12 9 Testing 12 9.1 General 12 9.2 Test documents 13 9.3 Test report 13 9.4
26、Test protocols 13 10 Test procedures 13 10.1 Construction 13 10.2 Sealing 13 10.3 Thermal durability 13 10.4 Ampoule 13 10.5 Measuring liquid purity and risk to health 13 10.6 Measuring liquid meter characteristics and hygroscopicity 13 10.7 Upper temperature limit 13 10.8 Measuring liquid over-fill
27、 for idle evaporation 13 10.9 Scale system 14 10.10 c-value, test procedure 14 10.11 c-value, test range 14 10.12 Rating factor K Q 14 10.13 Rating factor K C 14 11 Marking 14 Annex A (informative) Information and recommendations 15 A.1 Heating systems 15 A.2 Recommended field of application 15 A.3
28、Heat emission not controllable by the consumer 15 A.4 Additional corrections 15 Annex B (informative) Bibliography 16 Figure 1 Design of cylindrical ampoules 10 Figure 2 Scale size factor 12 Table A.1 Recommended field of applicationforheat cost allocators based on theevaporation principle (HKVV) an
29、d based onelectrical power supply (HKVE) 164 blankEN835:1994 BSI 12-1999 5 1 Introduction This standard defines heat cost allocators without electrical power supply, based on the evaporation principle, which serve to establish the consumption value of a room radiator. It also specifies the minimum r
30、equirements for construction, materials, production, installation, function and evaluation of the displayed readings established by these measuring devices. This standard specifies test procedures to establish the compliance with the stated requirements and gives instruction for the manner and the e
31、xtent of their realization. 2 Scope and general terms Heat cost allocators in accordance with this standard are instruments for the registration of the heat output of radiators in consumer units. Consumer units are dwellings, office buildings, business premises or industrial plants in which the heat
32、 is supplied by a common central heating system or by a common district heating connection. A complete grouping of consumer units is called an account unit. It could be necessary to divide an account unit into user groups, if an account unit comprises consumer units with typical differences (e.g.tec
33、hnically different types of heating systems, or different by way of consumption, e.g.industrial plants as opposed to private apartments). Heat cost allocators only allow the determination of the heat consumption of each radiator in a consumer unit as a share of the total heat consumption of the acco
34、unt unit or user group (see clause3). It is therefore necessary to determine this total heat consumption either by measuring the consumed fuel quantity or the amount of heat delivered (the latter e.g.by a heat meter). The condition for correct use of heat cost allocators in accordance with this stan
35、dard is that they are used in a heating system which: at the time of installation of the heat cost allocators, corresponds to the state of the art, and is operated in accordance with the state of the art (seeAnnex A, A.1). Heat cost allocators in accordance with this standard shall not be used for h
36、eating systems where the temperature limits are exceeded, where the rating factor for the thermal power, K Q , is not clearly specified or where the heating surface is inaccessible. This applies e.g.to following heating systems: underfloor heating; radiant ceiling heating; flap-controlled radiators;
37、 radiators with ventilators; fan-assisted air heaters; bath-tub convectors; heating systems where the radiators attached thereto are operated by steam; and horizontal single pipe heating systems exceeding more than one consumer unit. 3 Functional principle Heat cost allocators in accordance with thi
38、s standard are measuring devices for the registration of the temperature integral with respect to time. The temperature is the basis for the determination of the thermal output of the radiators on which the heat cost allocators are installed. Heat cost allocators in accordance with this standard, wi
39、thout electrical power supply based on the evaporation principle, use, of the characteristic temperatures determining the thermal output, only the temperature of the radiator surface (or the temperature of the heat medium). The non-rated displayed reading is the approximate value of the time integra
40、l of the measured characteristic temperature of the radiator. This type of construction utilizes the so-called single-sensor method. The rated displayed reading is obtained from the non-rated displayed reading by multiplication by rating factors, particularly with those for the nominal thermal power
41、 of the radiator and those for the thermal contact between the surface and the heat cost allocators (see4.15). The rated displayed reading is obtained either by reading the heat cost allocators equipped with a product scale directly (see4.11) or by later conversion of the non-rated displayed reading
42、 (see4.12). The rated displayed reading is an approximation of the heat emitted from the heating surface over the measuring period and consumed by the user. Thus the rated displayed reading is a measuring result influenced by characteristics of the heat cost allocators, of the radiator, of additiona
43、l conditions and by factors of uncertainty of the rating factors and the installation. Consequently the measuring deviations (measuring errors) of the recorded heat consumption are not only dependent on the heat cost allocator alone. Thus, heat cost allocators cannot be calibrated in the same way as
44、 heat meters.EN835:1994 6 BSI 12-1999 Because of the described characteristics the measuring result is not related to physical energy units. The rated displayed reading is non-dimensional. It is only a value relative to the sum of the rated displayed readings of the account unit or of the user group
45、. A relative value of a measured rated displayed reading which has been defined in that way has to be understood as a part of the total heat, consumed by the account unit or of the user group. At the end of the measuring period, this value is established separately for every radiator. From the sum o
46、f all the rated displayed readings for the radiators of a consumer unit, the above relative value will determine the part of the heat consumption of the respective consumer unit related to the total consumption of the account unit or the user group. Heat cost allocators consist of at least a casing,
47、 an ampoule with the measuring liquid, a reading scale, the installations and the seal. The seal serves to protect against unauthorized manipulation. Each heat cost allocator is a functional unit. Its individual parts are manufactured in compliance with certain tolerances. Thus each part of a partic
48、ular kind of heat cost allocator (type, make) functions in the same way when used in the same way. The measuring liquid in the open and transparent ampoule evaporates as a function of the temperature and the duration of the influence of that temperature. After each measuring period (normally12 month
49、s) the old ampoule will be exchanged against a full new one. 4 Definitions For the purpose of this standard, the following definitions apply. 4.1 reference condition for the purpose of determining the rating factors and the c-value, a reference condition must be defined. The reference condition can be freely selected within certain limits the reference condition of a radiator is as follows: upper flow inlet; mean heating medium temperature: t m = 50 C to 65 C; reference air temperature t L= (20 2) C. It shall be measured0,75m above the
