1、31t04589 0303806 475 I BS EN BRITISH STANDARD 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 Standard 835 : 19
2、95 BS EN 835 : 1995 under the authority of the effect on 1.5 August 1996 3 BSI 199.5 Standards Board and comes into Amd. NO. Date The following BSI references relate to the work on this standard: Committee reference CPLi30 Draft for comment 92/04219 DC ISBN O 580 24277 3 W 3404587 0103807 301 W Text
3、 affected 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 Gas plc Department o
4、f Energy (Gas and Oil Measurement Branch) Department of Trade and Industry (National Engineering Laboratory) Electricity Industry in United Kingdom Energy Industries Council GAMBICA (BEAMA Ltd.) Institute of Measurement and Control Institute of Petroleum Institute of Trading Standards Administration
5、 Institution of Gas Engineers Institution of Mechanical Engineers Society of British Gas Industries Water Services Association of England and Wales BS EN 835 : 1995 W 3404589 0303808 248 I Contents Committees responsible Inside front cover National foreword 11 Foreword 2 Text of EN 3 i W 3404589 OL0
6、3809 184 W BS EN 835 : 1995 National foreword This British Standard has been prepared by %chnical Committee CPL30. It is the English language version of EN 835 : 1994 Heat cost allocators for the determination of the consumption of room heatiw radiators - Appliances without an electrical energy supl
7、y, based on the evaporation principle, published by the European Committee for Standardization (GEN). The foreword of the European Standard makes reference to the date of withdrawal of conflicting national standards. In this case no such national standard exists. Product certification. Users of this
8、 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 systems against the appropriate standard in the BS EN IS0
9、 9000 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 approaching an appropriate body from the list of Associ
10、ation members. Compliance with a British Standard does not of itself confer immunity from legal obligations. ii I 3404589 0103810 9Tb I EUROPEAN STANDARD EN 835 NORME EUROPENNE EUROPISCHE NORM October 1994 ICs 91.140.10 Descriptors: Metrology, buildings, heating, energy consumption, measuring instru
11、ments, temperature measuring instruments, recording apparatus, definitions, equipment, specifications, performance evaluation, installation, inspection English version Heat cost allocators for the determination of the consumption of room heating radiators - Appliances without an electrical energy su
12、pply, based on the evaporation principle Rpartiteurs de frais de chauffage pour enregistrer les valeurs de consommation de surfaces de corps de chauffe - Appareils sans alimentation en nergie lectrique en vertu du principe dvaporation Verdundtungsprinzip Heizkostenverteiler fr die Verbrauchswerterfa
13、ssung von Raumheizflchen - Gerte ohne elektrische Energieversorgung nach dem This Europeran Standard was approved by CEN on 1994-10-14. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national s
14、tandard without any alteration. Up-to-date lists and bibliographical references concerning such national 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
15、language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secreatariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ir
16、eland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kindom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36. B- 1050 Brussels O 1994 Copyright reserved to CEN m
17、embers Ref. No. EN 835 : 1994 E I 3404589 OL038LL 832 Page 2 EN 835 : 1994 Foreword This European Standard has been prepared by Technical Committee CEN/TC 171, Heat cost allocation, the secretariat of which is held by DIN. This standard includes two informative annexes A and B. These parts of the st
18、andard are not binding. 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 April 1995, and conflicting national standards shall be withdrawn at the latest by April 1995. According to the CENICENELEC
19、Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, . Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United-Kingdom. Contents 1 2 3 4 4.1 4.2 4.3 4.4
20、 4.5 4.6 4.7 4.8 4.9 4.10 4.11 4.12 4.13 4.14 4.15 4.16 4.17 Introduction Scope and general terms Functional principle Definitions Reference condition Reference temperature of the measuring liquid Design flow and return temperatures, mean design heating medium temperature, design temperature of the
21、measuring liquid Displayed reading Rated displayed reading Nominal evaporation Evaporation rate Counting rate Meter characteristic Counting ratio Consumption scale Unit scale Idle evaporation Measuring period c-value Rating factors Manufacturer 5 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 6 6.1 6.2 6.3 6.4 6.5
22、 Page 47 4 7.1 4 7.2 5 7.3 5 7.4 7.5 58 9 5 9.1 5 9.3 5 9.4 5 10 5 10.1 5 10.2 5 9.2 5 10.3 6 10.4 6 10.5 6 6 10.6 10.7 10.8 10.9 6 Requirements for heat cost allocat ors Casing Ampoule Measuring liquid Over-fill for idle evaporation Sealing Scale system Consumption scale Unit scale Requirements for
23、 use and installation Temperature limits Installation on the radiator Installation position Conformity of instruments Requirements for installation in single pipe systems Requirements for rating Resulting rating factor K Rating factor KQ Rating factor Kc c-value Rating factor KT Requirements for mai
24、ntenance and reading Testing General Test documents Test report Test protocols Test procedures Construction Sealing Thermal durability Ampoule Measuring liquid purity and risk to health Measuring liquid meter characteristics and hygroscopicity Upper temperature limit Measuring liquid over-fiil for i
25、dle evaporation Scale system Page 6 6 7 7 7 7 7 8 8 8 8 9 9 9 9 9 9 10 10 10 10 10 11 11 11 11 11 11 11 11 11 11 11 11 12 12 12 I 3404589 0303832 777 I 10.10 c-value, test procedure 10.11 c-value, test range 10.12 Rating factor KQ 10.13 Rating factor KC 11 Marking Annex A (informative) Information a
26、nd recommendations A. 1 Heating systems A.2 Recommended field of application A.3 Heat emission not controllable by the consumer A.4 Additional corrections Annex B (informative) Bibliography page 12 12 12 12 12 13 13 13 13 13 14 Page 3 EN 835 : 1994 Page 4 EN 835 : 1994 I 3404589 OL03BL3 605 H 1 Intr
27、oduction 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 requirements for construction, materials, production, installation, function and e
28、valuation 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 extent of their realization. 2 Scope and general terms Heat cost allocators in acc
29、ordance 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 is supplied by a common central heating system or by a common district heating c
30、onnection. 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. technically different types of heating systems, or different by way of consumption,
31、 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 account unit or user group (see clause 3). It is therefore necessary to determine t
32、his 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 standard is that they are used in a heating system which: - at the time of instal
33、lation of the heat cost allocators, corresponds to the state of the art, and - is operated in accordance with the state of the art (see annex A, A.l). Heat cost allocators in accordance with this standard shall not be used for heating systems where the temperature limits are exceeded, where the rati
34、ng factor for the thermal power, KQ, 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; radiators with ventilators; fan-assisted air heaters; bath-tub convector
35、s; 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 this standard are measuring devices for the registration of the temperature
36、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, without electrical power supply based on the evaporation principle, use, of
37、 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 integral of the measured characteristic temperature of the radiator. This type o
38、f 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 of the radiator and those for the thermal contact between the surface an
39、d the heat cost allocators (see 4.15). The rated displayed reading is obtained either by reading the heat cost allocators equipped with a product scale directly (see 4.11) or by later conversion of the non-rated displayed reading (see 4.12). The rated displayed reading is an approximation of the hea
40、t 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 additional conditions and by factors of uncertainty of the rating factors and t
41、he 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 heat meters. Because of the described characteristics the measuring r
42、esult 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. A relative value of a measured rated displayed reading which has been defined in that way ha
43、s 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 3404589 0403814 541 I Page 5 EN 835 : 1994 every radiator. From the sum of all the rated displayed readings for the radiator
44、s 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, an ampoule with the measuring liquid, a reading sc
45、ale, 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 particular kind of heat cost allocator (type, make) funct
46、ions 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 (normally 12 months) the old ampoule will be exchanged against a ful
47、l 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 refe
48、rence condition of a radiator is as follows: - upper flow inlet; - mean heating medium temperature: tm = 50 OC to 65 OC; - reference air temperature t = (20 f 2) OC. It shall be measured 0,75 m above the floor and at a distance of 1,5 m from the heating surface in a test chamber with a stable climat
49、e; - heating medium flow (water flow through the radiator) at tv t i tL = 90 OC / 70 OC / 20 OC where: tv is the flow temperature; t is the return temperature; 4.2 reference temperature of the measuring liquid The reference temperature of the measuring liquid is used for the determination of the rating factor Kc (see 4.16.2). The reference temperature is to be determined in the reference condition. 4.3 design flow and return temperatures, mean design heating medium temperature, design temperature of the measuring liquid The design flow and return temperatures are the tempe
