1、DEUTSCHE NORM April 1995 DIN EN 835 Heat cost allocators for the determination of the consumption of room heating radiators Appliances without an electrical energy supply, based on the evaporation principle English version of DIN EN 835 c W - m 2 E O c e - 3 Y) Y) , .- - u 2 a Q a a r c O m ._ E o O
2、 L o m 5 - 3 O f ._ 3 u 0 3 -0 L a m a 3. E L D m Y) Y) c ._ f w r c O z o ICs 91.1 40.1 O Supersedes November 1994 edition. Descriptors: Heating, HVAC systems, heat cost allocators, energy consumption. Heizkostenverteiler fr die Verbrauchswerterfassung von Raumheizflchen; Gerte ohne elektrische Ene
3、rgieversorgung nach dem Verdunstungsprinzip European Standard EN 835: 1994 has the status of a DIN Standard. A comma is used as the decimal marker. National foreword This standard has been prepared by CENTTC 171. The responsible German body involved in its preparation was the Normenausschu Heiz- und
4、 Raumlufttechnik (HVAC Standards Committee). Amendments In comparison with DIN 4713-2, March 1990 edition, the following amendments have been made. a) This standard is largely based on the specifications of DIN 4713-2, the scope having been extended to include single pipe systems covering more than
5、one consumer unit. b) The annex includes information and recommendations for heating systems to be equipped with heat cost alloca- tors. Previous editions DIN 4713-2: 1980-12, 1990-03; DIN 4714-2: 1980-12; DIN EN 835: 1994-11. EN comprises 23 pages. yth Verlag GmbH, Berlin, has the exclusive right o
6、f sale for German Standards(0IN-Normen). DIN EN 835 Engl. Price group 9 Sales No. 11 O9 09.95 EUROPEAN STANDARD NORME EUROPENNE EUROP/ISCHE NORM EN 835 October 1994 ICs 91.140.10 Descriptors: Heating, HVAC systems, heat cost allocators, energy consumption. English version Heat cost allocators for th
7、e 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 valeurs de consommation de surfaces de corps de chauffe; ap- pareils sans alimentation en nergie lec-
8、 trique en vertu du principe dvaporation Heizkostenverteiler fr die Verbrauchs- werterfassung von Raumheizflchen; Gerte ohne elektrische Energiever- sorgung nach dem Verdunstungsprinzip This European Standard was approved by CEN on 1994-10-14. CEN members are bound to comply with the GENKENELEC Inte
9、rnal 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 national standards may be obtained on application to the Central Secretariat or to any GEN membe
10、r. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. GEN members
11、are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches K
12、omitee fr Normung Central Secretariat: rue de Stassart 36, B-I 050 Brussels O 1994. Copyright reserved to all GEN members. Ref. No. EN 835:1994 E Page 2 EN 835 : 1994 Contents Page Foreword . 4 1 Introduction . 4 2 Scope and general terms 4 3 Functional principle . 5 4 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.
13、9 4.10 4.1 1 4.1 2 4.13 4.14 4.15 4.16 4.17 5 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 4.8 Definitions 6 Reference condition . 6 Reference temperature of the measuring liquid 6 design temperature of the measuring liquid . 6 Displayed reading . 6 Rated displayed reading 6 Nominal evaporation . 7 Evaporation r
14、ate 7 Design flow and return temperatures. mean design heating medium temperature. Counting rate 7 Meter characteristic . 7 Counting ratio . 7 Unit scale 7 Consumption scale 7 Idle evaporation 7 Measuring period . 7 c-value 8 Rating factors . 8 Manufacturer 9 Requirements for heat cost allocators .
15、9 Casing 9 Measuring liquid . 9 Over-fill for idle evaporation 10 Sealing . 10 Scalesystem . 10 Consumption scale . 11 Unit scale 11 Ampoule . 9 6 Requirements for use and installation 12 6.1 Temperature limits . 12 6.2 Installation on the radiator 12 6.3 Installation position 12 6.4 Conformity of i
16、nstruments . 13 Requirements for installation in single pipe systems 15 7 Requirements for rating . 15 Resulting rating factor K . 15 Rating factor K, . 15 Rating factor KT . Requirements for maintenance and reading 16 6.5 7.1 7.2 7.3 Rating factor& . 15 7.4 c-value . 15 7.5 16 8 9 Testing . 16 9.1
17、General . 16 9.2 Testdocuments . 16 Page 3 EN 835 : 1994 9.3 Testreport 16 9.4 Test protocols 17 10 10.1 10.2 10.3 10.4 10.5 10.6 10.7 10.8 10.9 10.10 10.11 10.12 10.13 . Test procedures 17 Construction . 17 Sealing . 17 Ampoule 17 Thermal durability . 17 Measuring liquid purity and risk to health .
18、 17 Measuring liquid meter characteristics and hygroscopicity . 17 Upper temperature limit . 18 Measuring liquid over-fill for idle evaporation 18 Scalesystem . 18 c-value. test procedure 18 c-value, test range . 18 Rating factor KO . 19 Rating factor Kc . 19 11 Marking . 19 Annex A (informative) A
19、. 1 Heatingsystems 20 A.3 Additional corrections . A.4 21 Information and recommendations . 20 A.2 Recommended field of application 20 Heat emission not controllable by the consumer 20 Annex B (informative) Bibliography Page 4 EN 835 : 1994 Foreword This European Standard has been prepared by the Te
20、chnical Committee CENiTC 17 1 “Heat cost allocation“, the secretariat of which is held by DIN. This standard includes 2 informative annexes A and B. These parts of the standard are not binding. This European Standard shall be given the status of a National Standard, eirher by publication of an ident
21、ical 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 CENKENELEC internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland. Fr
22、ance, Germany. Greece, Iceland, Ireland, Iuiy, Luxembourg, Netherlands. Norway, Portugal, Spain. Sweden, Switzerland, United Kingdom. 1 Introduction This standard defines heat cost allocators without electrical power suppiy, based on the evaporation principle which serve to establish the consumption
23、 value of a room radiator. It also specifies the minimum requirements for construction, materiais, production, installation, function and evaluation of the displayed readings estab- lished by these measuring devices. This standard specifies test procedures to establish the compliance with the stated
24、 requirements and gives instruction for the manner and the extent 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 buildin
25、gs, business premises or industrial plants in which the heat 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 uni
26、t comprises consumer units with typical differences e.g. technically 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 consume
27、r unit as a share of the total heat consumption of the account unitor user group (see clause 3). 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 corr
28、ect use of heat cost allocators in accordance with this standard 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 (see annex A, A.1). Heat cost allo
29、cators in accordance with this standard shall not be used for heating systems where the temperature limits are exceeded, where the rating factor for the thermal power, Ka, is not clearly specified or where the heating surface is inaccessible. This applies e. g. to following heating systems: underflo
30、or heating radiant ceiling heating flap-controlled radiators radiators with ventilators Page 5 EN 835 : 1994 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 cons
31、umer unit 3 Functional principle Heat cost allocators in accordance with this 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 allocat
32、ors are installed. Heat cost allocators in accordance with this standard, without electrical power supply based on the evaporation principle, use of the characterisic temperatures determining the thermal output only the temperature of the radiator surface (or the temperature of the heat medium). The
33、 non-rated displayed reading is the approximate value of the time integral 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 multiplicatio
34、n by rating factors, particularly with those for the nominal thermal power of the radiator and those for the thermal contact between the surface and 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 d
35、irectly (see 4.1 1) or by later conversion of the non-rated displayed reading (see 4.1 2). 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 influence
36、d by characteristics of the heat cost allocators, of the radiator, of additional 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 allo
37、cator alone. Thus, heat cost allocators cannot be calibrated in the same way as heat meters. 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 disp
38、layed 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 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 es
39、tablished separately for every radiator. From the sum of 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 gr
40、oup. Heat cost allocators consist of at least a casing, 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 complia
41、nce with certain tolerances. Thus each part of a particular 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 tem
42、perature. After each measuring period normally 12 months) the old ampoule will be exchanged against a full new one. Page 6 EN 835 : 1994 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
43、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: rm = 50 C to 65 C Reference air temperature rL = (20 f 2) C. It shall be me
44、asured 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 climate. Heating medium flow (water flow through the radiator) at fv / rR / r, = 90 C / 70 C / 20 C - - where: rv is the flow temperature rR is the return temperature 4.2 Reference tempe
45、rature of the measuring liquid The reference temperature of the measuring liquid is used for the determination of the rating factor K, (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 temperat
46、ure - design temperature of the measuring liquid The design flow and return temperatures are the temperatures of the heating medium of the radiators required to reach the design indoor temperature in the heated rooms under steady state conditions at a heat load corresponding to a geographically dete
47、rmined design reference outside temperature. The mean value of the design flow temperature fv,A and the design return temperature tR.A is the mean design heating medium temperature ?,A. This temperature is to be determined from the logarithmic mean value of the excess tempera- tures relating to the
48、reference air temperature of 20 C. The temperature of the measuring liquid under these conditions is the design temperature of the measuring liquid 4.4 Displayed reading The displayed reading is the reduction of the liquid level in scale graduations, measured from zero on the scale. The displayed re
49、ading may be unrated or it can directly represent the rated displayed reading (see 4.5). Interpolation is permissible. 4.5 Rated displayed reading The rated displayed reading is the displayed reading rated with the rating factors in accordance with 4.16. Page 7 EN 835 : 1994 4.6 Nominal evaporation The nominal evaporation Is the displayed reading (see 4,4 and 4.5) after 210 days at a measuring liquid temperature of 50 C. 4.7 Evaporation rate The evaporation rate v is the rate of the change of the liquid level. It is a function of the temperature and the liqui
