Heat cost allocators for the determination of the consumption of room heating radiators - Appliances with electrical energy supply

This European standard applies to heat cost allocators which are used to capture the proportionate thermal output of radiators in consumer units. If an account unit comprises consumer units of different types (e.g. technically different types of heating systems or differences due to the consumer behaviour, e.g. industrial plants as opposed to private apartments), it could be necessary to divide this account unit into groups of users. Heat cost allocators enable the determination of the heat consumption only of each radiator in a consumer unit as a share of the total heat consumption of the account unit or user group; 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 by means of a heat meter, for example). For the appropriate use of the heat cost allocators in accordance with this standard, the heating system needs to: correspond to the state of the art at the time of installation of the heat cost allocators; be operated in accordance with the state of the art. This standard specifies that heat cost allocators shall not be used for heating systems where the temperature of the heating system falls below or exceeds the temperature limits of the heat cost allocators, where the rating factor for the thermal output, KQ, cannot be clearly specified or where the heating surface is inaccessible. This applies usually to the following heating systems: floor heating; radiant ceiling heating; flap-controlled radiators; radiators with ventilators; fan-assisted air heaters; heating systems with steam-operated radiators.

Heizkostenverteiler für die Verbrauchserfassung von Raumheizflächen - Geräte mit elektrischer Energieversorgung

ANMERKUNG      Zum Verständnis nachfolgend verwendeter Begriffe siehe Abschnitt 3.
Heizkostenverteiler nach dieser Norm dienen zur Erfassung der anteiligen Wärmeabgabe von Heizkörpern in Nutzeinheiten.
Existieren in einer Abrechnungseinheit Nutzeinheiten mit typischen Unterschieden (z. B. technisch in Form unterschiedlicher Heizsysteme oder im Verbrauchsverhalten, z. B. Industrieräumlichkeiten gegenüber privaten Wohnungen), so kann eine entsprechende Unterteilung der Abrechnungseinheit in Nutzergruppen erforderlich sein.
Aus der Tatsache, dass mit Heizkostenverteilern nur die jeweils anteilige Wärmeabgabe der Heizflächen in den Nutzeinheiten bezogen auf den gesamten Wärmeverbrauch der Abrechnungseinheit bzw. der Nutzer¬gruppe bestimmt werden kann (siehe Abschnitt 4), ergibt sich die Notwendigkeit, dass dieser gesamte Wärmeverbrauch bestimmt werden muss. Dies erfolgt über Messung der verbrauchten Brennstoffmenge oder der Wärmemenge (letztere z. B. mittels Wärmezählern).
Zur sachgerechten Anwendung von Heizkostenverteilern nach dieser Norm soll die Heizungsanlage
-   dem Stand der Technik zum Zeitpunkt der Aus¬stattung mit Heizkostenverteilern entsprechen und
-   dem Stand der Technik entsprechend betrieben werden (siehe Anhang A, A.1).
Heizkostenverteiler nach dieser Norm dürfen für Heizsysteme nicht angewendet werden, bei denen die Tem-peratur-Einsatzgrenzen der Heizkostenverteiler unter- bzw. überschritten werden, bei denen der Bewertungs-faktor KQ für die Wärmeleistung nicht eindeutig definiert werden kann oder bei denen die Heizfläche nicht zugänglich ist. Dies trifft in der Regel für folgende Heizsysteme zu:
-   Fußbodenheizungen
-   Deckenstrahlungsheizungen
-   klappengesteuerte Heizkörper
-   Heizkörper mit Gebläse
-   Warmlufterzeuger
-   Heizungssysteme, deren Heizkörper mit Dampf betrieben werden.

Répartiteurs de frais de chauffage pour enregistrer les valeurs de consommation de surfaces de corps de chauffe - Appareils avec une alimentation en énergie électrique

NOTE   Se reporter à l'Article 3 pour une définition des termes utilisés ci-après.
Les répartiteurs de frais de chauffage conformes à la présente norme sont utilisés pour enregistrer proportionnellement la chaleur émise par des radiateurs dans des unités d'utilisation.
Si une unité de calcul des frais comporte des unités d'utilisation de différents types (par exemple, types techniquement différents de systèmes de chauffage ou différences liées au comportement des consommateurs, par exemple locaux industriels par opposition à des logements privés), il se peut qu'une subdivision des unités de calcul des frais en groupes d'usagers s'avère nécessaire.
Les répartiteurs de frais de chauffage ne permettant de déterminer la consommation de chaleur particulière de chaque corps de chauffe dans une unité d'utilisation qu'en tant que part de la consommation totale de chaleur de l'unité de calcul de frais ou du groupe d'usagers (voir Article 4), il est donc nécessaire de déterminer cette consommation totale de chaleur en mesurant soit la quantité de combustible consommée ou la quantité de chaleur fournie (cette dernière mesure s'effectuant au moyen d'un compteur de chaleur, par exemple).
Pour une utilisation appropriée des répartiteurs de frais de chauffage conformément à la présente norme, le système de chauffage doit :
-   correspondre à l'état de la technique au moment du montage des répartiteurs de frais de chauffage ;
-   être exploité conformément à l'état de la technique (voir Annexe A, A.1).
Les répartiteurs de frais de chauffage conformes à la présente norme ne doivent pas être employés pour des systèmes de chauffage dans lesquels la température chute au-dessous ou dépasse les limites de températures d'utilisation des répartiteurs de frais de chauffage, dans lesquels le facteur d'évaluation de la puissance thermique, KQ, ne peut pas être clairement spécifié ou dans lesquels la surface de chauffe n'est pas accessible.

Delilniki stroškov oddane toplote ogreval - Naprave z električnim napajanjem

Ta evropski standard se uporablja za delilnike stroškov, ki so namenjeni zajemu sorazmerne oddaje toplote ogreval v potrošniških enotah. Če obračunska enota zajema potrošniške enote različnih vrst (npr. tehnično različne vrste grelnih sistemov ali razlike zaradi obnašanja potrošnikov, npr. industrijski obrati za razliko od zasebnih stanovanj), je morda treba to obračunsko enoto razdeliti na skupine uporabnikov. Delilniki stroškov omogočajo izračun porabe toplote le za vsako ogrevalo v potrošniški enoti kot delež skupne porabe toplote obračunske enote ali uporabniške skupine; zato je potrebno ugotoviti skupno porabo toplote z merjenjem porabljene količine goriva ali količine dobavljene toplote (ki se meri na primer z merilnikom toplote). Za ustrezno uporabo delilnikov stroškov v skladu s tem standardom mora grelni sistem: ustrezati zadnjemu stanju tehničnega razvoja v času vgradnje delilnikov stroškov; upravljati ga je treba v skladu z zadnjih stanjem tehničnega razvoja. Ta standard določa, da se delilniki stroškov ne smejo uporabljati za grelne sisteme, kadar temperatura grelnega sistema pade pod ali preseže mejne vrednosti temperature delilnikov stroškov, kadar faktorja za oceno oddaje toplote KQ ni mogoče jasno opredeliti ali kadar grelna površina ni dostopna. Običajno se uporablja za naslednje grelne sisteme: talno gretje; stropno gretje; ogrevala s krmiljenjem loput; ogrevala s šobami za zrak; grelniki zraka s pomočjo ventilatorja; grelni sistemi s parnimi radiatorji.

General Information

Status
Published
Public Enquiry End Date
29-Sep-2010
Publication Date
06-Oct-2013
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
23-Aug-2013
Due Date
28-Oct-2013
Completion Date
07-Oct-2013

RELATIONS

Buy Standard

Standard
SIST EN 834:2013
English language
32 pages
sale 10% off
Preview
sale 10% off
Preview

e-Library read for
1 day

Standards Content (sample)

SLOVENSKI STANDARD
SIST EN 834:2013
01-november-2013
1DGRPHãþD
SIST EN 834:2002
'HOLOQLNLVWURãNRYRGGDQHWRSORWHRJUHYDO1DSUDYH]HOHNWULþQLPQDSDMDQMHP

Heat cost allocators for the determination of the consumption of room heating radiators -

Appliances with electrical energy supply
Heizkostenverteiler für die Verbrauchserfassung von Raumheizflächen - Geräte mit
elektrischer Energieversorgung

Répartiteurs de frais de chauffage pour enregistrer les valeurs de consommation de

surfaces de corps de chauffe - Appareils avec une alimentation en énergie électrique

Ta slovenski standard je istoveten z: EN 834:2013
ICS:
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
SIST EN 834:2013 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 834:2013
---------------------- Page: 2 ----------------------
SIST EN 834:2013
EUROPEAN STANDARD
EN 834
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2013
ICS 91.140.10 Supersedes EN 834:1994
English Version
Heat cost allocators for the determination of the consumption of
room heating radiators - Appliances with electrical energy supply

Répartiteurs de frais de chauffage pour déterminer la Heizkostenverteiler für die Verbrauchserfassung von

consommation des corps de chauffe - Appareils dotés Raumheizflächen - Geräte mit elektrischer

d'une alimentation en énergie électrique Energieversorgung
This European Standard was approved by CEN on 28 December 2012.

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 national

standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

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 CEN-CENELEC Management Centre has the same

status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United

Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2013 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 834:2013: E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 834:2013
EN 834:2013 (E)
Contents Page

Foreword ..............................................................................................................................................................4

Introduction .........................................................................................................................................................5

1 Scope ......................................................................................................................................................5

2 Normative references ............................................................................................................................6

3 Terms and definitions ...........................................................................................................................6

4 Functional principle and measurement methods ............................................................................ 11

5 General specifications ....................................................................................................................... 12

5.1 Base condition .................................................................................................................................... 12

5.2 c-value .................................................................................................................................................. 13

5.3 Rating factors ...................................................................................................................................... 13

5.4 Calendar function ............................................................................................................................... 14

6 Requirements for heat cost allocators ............................................................................................. 15

6.1 Requirements concerning temperature stress ................................................................................ 15

6.2 Storage temperature ........................................................................................................................... 15

6.3 Start of counting ................................................................................................................................. 15

6.4 Idle counting rate ................................................................................................................................ 15

6.5 Temperature sensors ......................................................................................................................... 15

6.6 Calculator/central processing unit .................................................................................................... 16

6.7 Auxiliary power supply ...................................................................................................................... 16

6.8 Overflow of the display ...................................................................................................................... 16

6.9 Display resolution ............................................................................................................................... 16

6.10 Functional check................................................................................................................................. 16

6.11 Limits of relative display deviation ................................................................................................... 17

6.12 Ageing .................................................................................................................................................. 17

6.13 Electrical, electrostatic and magnetic influences ........................................................................... 17

6.14 Thermal impact on heat cost allocators operating in accordance with the single-sensor

measurement method ........................................................................................................................ 17

6.15 Thermal impact on heat cost allocators operating in accordance with the two-sensor

measurement method ........................................................................................................................ 17

6.16 Thermal impact on other devices or components .......................................................................... 18

6.17 Impact on transmission systems ...................................................................................................... 18

6.18 Sealing ................................................................................................................................................. 18

6.19 Calendar function ............................................................................................................................... 18

6.20 Taking into account operating conditions ....................................................................................... 18

7 Requirements for use and installation ............................................................................................. 19

7.1 Temperature limits .............................................................................................................................. 19

7.2 Attachment of the sensors ................................................................................................................ 19

7.3 Attachment position of the sensors ................................................................................................. 20

7.4 Connecting cable installation ............................................................................................................ 20

7.5 Uniformity of heat cost allocators ..................................................................................................... 20

8 Rating requirements ........................................................................................................................... 21

8.1 Rating factor K .................................................................................................................................. 21

8.2 Rating factor K .................................................................................................................................. 21

8.3 Rating factor K .................................................................................................................................. 21

8.4 Resulting rating factor K .................................................................................................................... 21

8.5 c-value .................................................................................................................................................. 21

---------------------- Page: 4 ----------------------
SIST EN 834:2013
EN 834:2013 (E)

9 Requirements for maintenance and reading .................................................................................... 22

9.1 Visual reading ...................................................................................................................................... 22

9.2 Close-range reading ............................................................................................................................ 22

9.3 Remote reading ................................................................................................................................... 22

10 Testing .................................................................................................................................................. 22

10.1 General ................................................................................................................................................. 22

10.2 Test documents ................................................................................................................................... 23

10.3 Test report ............................................................................................................................................ 23

10.4 Test protocols ...................................................................................................................................... 23

11 Test procedures ................................................................................................................................... 23

11.1 Construction test ................................................................................................................................. 23

11.2 Sealing test .......................................................................................................................................... 23

11.3 Temperature durability test ................................................................................................................ 23

11.4 Test for compliance with the limits of the relative display deviation ............................................ 24

11.5 Ageing resistance test ........................................................................................................................ 24

11.6 Test of the start of counting at normal operation and also, for heat cost allocators with

room temperature sensors, at operation with thermal impact ....................................................... 24

11.7 Test of the idle counting rate ............................................................................................................. 25

11.8 Test of the counting rate in the case of thermal impact .................................................................. 25

11.9 Test for external influences ................................................................................................................ 26

11.10 Test of c-values, procedure ................................................................................................................ 26

11.11 Test of c-values, scope of testing ...................................................................................................... 26

11.12 Test of rating factor K ....................................................................................................................... 26

11.13 Test of rating factor K ....................................................................................................................... 27

12 Marking ................................................................................................................................................. 27

Annex A (informative) Information and recommendations .......................................................................... 28

A.1 General ................................................................................................................................................. 28

A.2 Heating systems .................................................................................................................................. 28

A.3 Recommended field of application .................................................................................................... 28

A.4 Heat emission not controllable by the consumer ............................................................................ 29

A.5 Additional corrections ........................................................................................................................ 29

A.6 Documentation of the relationship between the counting rate and the thermal output .............. 30

Bibliography ...................................................................................................................................................... 32

---------------------- Page: 5 ----------------------
SIST EN 834:2013
EN 834:2013 (E)
Foreword

This document (EN 834:2013) has been prepared by Technical Committee CEN/TC 171 “Heat cost

allocation”, 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 February 2014, and conflicting national standards shall be withdrawn at

the latest by February 2014.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 834:1994
Amendments
Compared to EN 834:1994, the following changes were made:
a) Definitions, requirements and test procedures have been refined and expanded,
b) Introduction of new values for the lower temperature limit,

c) Uniform definition for the mounting location of heat cost allocators on the radiator.

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, Croatia, Cyprus, Czech

Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,

Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,

Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

---------------------- Page: 6 ----------------------
SIST EN 834:2013
EN 834:2013 (E)
Introduction

This document deals with heat cost allocators with electrical power supply used for establishing the

consumption value of room heating surfaces. It specifies the minimum requirements for the construction,

materials, production, installation, function and evaluation of the displayed readings established by these

measuring devices.

This document describes test procedures to establish compliance with the stated requirements and specifies

instructions for their nature and scope.
1 Scope
NOTE See Clause 3 for a definition of the terms used below.

This European standard applies to heat cost allocators which are used to capture the proportionate thermal

output of radiators in consumer units.

If an account unit comprises consumer units of different types (e.g. technically different types of heating

systems or differences due to the consumer behaviour, e.g. industrial plants as opposed to private

apartments), it could be necessary to divide this account unit into groups of users.

Heat cost allocators enable the determination of the heat consumption only of each radiator in a consumer

unit as a share of the total heat consumption of the account unit or user group (see Clause 4); 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 by means of a heat meter, for example).

For the appropriate use of the heat cost allocators in accordance with this standard, the heating system needs

to:

 correspond to the state of the art at the time of installation of the heat cost allocators;

 be operated in accordance with the state of the art (see A.2).

This standard specifies that heat cost allocators shall not be used for heating systems where the temperature

of the heating system falls below or exceeds the temperature limits of the heat cost allocators, where the

rating factor for the thermal output, K , cannot be clearly specified or where the heating surface is

inaccessible. This applies usually to the following heating systems:
 floor heating;
 radiant ceiling heating;
 flap-controlled radiators;
 radiators with ventilators;
 fan-assisted air heaters;
 heating systems with steam-operated radiators.
---------------------- Page: 7 ----------------------
SIST EN 834:2013
EN 834:2013 (E)
2 Normative references
Not applicable.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
heat cost allocator

instrument for registration of the proportionate thermal output of radiators in consumer units

3.2
heat cost allocation system

overall system, as verified by an inspection authority, consisting of a heat cost allocator, installation

equipment, installation instructions, rating system, existing rating factors, maintenance and reading

instructions
3.3
measurement method

physical principle of measurement in combination with fundamental properties of the appliance type

Note 1 to the term: For heat cost allocators in accordance with this standard, the fundamental property of the appliance

type characterizing the method is the number of measuring sensors for registering the relevant temperatures. The physical

principle of measurement which is applied preferably is the temperature dependency of electrical components.

3.4
consumer unit

dwellings, office, business or industrial premises in which the heat is supplied by a common central heating

system or by a common district heating connection
3.5
account unit
total of all consumer units
3.6
user group

group of consumer units within one account unit, each with a uniform heating system and comparable type of

use
3.7
mean heating medium temperature
mean value of the flow and return temperatures of the heating medium

Note 1 to the term: In this standard, t is determined by adding up the logarithmic heating medium excess temperature,

Δt , (formula (2), see 5.2) and the reference air temperature, t .
ln L
3.8
heating medium excess temperature

temperature difference between the mean heating medium temperature and the reference air temperature

Note 1 to the term: In this standard, the heating medium excess temperature (abbreviated as "excess temperature") is

determined as the logarithmic excess temperature Δt in accordance with formula (2) (see 5.2).

---------------------- Page: 8 ----------------------
SIST EN 834:2013
EN 834:2013 (E)
3.9
design flow temperature
V,A

value of the flow temperature of the radiators required in order to reach the design indoor temperature in the

heated rooms under steady state conditions at a heat load corresponding to a geographically determined

design reference outside temperature
3.10
design return temperature
R,A

value of the return temperature of the radiators required in order to reach the design indoor temperature in the

heated rooms under steady state conditions at a heat load corresponding to a geographically determined

design reference outside temperature
3.11
mean design heating medium temperature
m,A
mean value of the design flow temperature and the design return temperature

Note 1 to the term: In this standard, t is determined by adding up the logarithmic mean value of the design excess

m,A

temperature and the basic reference air temperature of 20 °C in accordance with formula (2) (see 5.2).

3.12
base condition

radiator operating condition which is freely selectable within predefined limits and which is used for specifying

the rating factors and for determining the c-values
3.13
basic reference air temperature
L,B
value of the air temperature at base condition
Note 1 to the term: For t the specified target value is 20 °C, see 5.1.
L,B
3.14
reference air temperature

actual value of the air temperature while requirements are specified and measurements are carried out

3.15
heating medium base flow
medium flow through the radiator at base condition
3.16
temperature sensors

sensors consisting of a sensor element and a sensor casing, which generate a temperature-dependent signal

Note 1 to the term: The sensor casing serves both to transfer heat and to protect the sensor element from mechanical

influences.
3.17
measuring range of temperature sensors
temperature range within which temperature sensors can be used

Note 1 to the term: For pairs of temperature sensors which are used for the determination of temperature differences, in

addition to the measuring range, there is also a temperature difference range.
---------------------- Page: 9 ----------------------
SIST EN 834:2013
EN 834:2013 (E)
3.18
upper temperature limit
max

maximum mean design heating medium temperature t of the heating system heating surfaces equipped

m,A
with heat cost allocators at which the heat cost allocator can be used

Note 1 to the term: t is a property of the heat cost allocator which is determined by the temperature resistance of the

max
components used.
3.19
lower temperature limit
min

minimum mean design heating medium temperature t of the heating system at which the heat cost

m,A
allocator can be used

Note 1 to the term: t is a property of the heat cost allocator, which is determined by the measurement method. This

min

definition applies to double-pipe systems directly. For single-pipe systems, the mean design heating medium

temperature t of the heating system is replaced by the mean design heating medium temperature t of the last

m,A m,A

radiator in the string or, as a substitute, the design return temperature t of the string.

R,A
3.20
start temperature

mean heating medium temperature of the radiator, t = t , at partial load, with the mass flow corresponding to

Z m

the base condition, at which the heat cost allocators start counting, in accordance with the single-sensor

measurement method without a room temperature start sensor
3.21
start excess temperature

mean heating medium excess temperature Δt = t - t of the radiator at partial load, with the mass flow

Z m L

corresponding to the base condition, at which the heat cost allocators start counting, in accordance with the

two-sensor measurement method or single-sensor measurement method with a room temperature start

sensor
3.22
c-value

measure for the degree of thermal coupling between the temperature sensors and the temperatures to be

registered

Note 1 to the term: The c-value is defined as a temperature difference ratio, see 5.2, formula 1.

3.23
displayed reading value

measuring value produced by the heat cost allocator which can be read off as a numerical value at the display

device

Note 1 to the term: If this value does not equal zero at the beginning of the measuring period, the displayed reading

relevant for the heat cost calculation is determined from the difference between the numerical values at the end and the

beginning of the measuring period. The reading may be a non-rated value or the consumption value (see 3.24).

3.24
consumption value
displayed reading value rated by rating factors
---------------------- Page: 10 ----------------------
SIST EN 834:2013
EN 834:2013 (E)
3.25
counting rate
progression of the displayed reading or the consumption value per unit of time

Note 1 to the term: When determining the relative display deviation (3.28), the value measured at the temperatures of the

operating state is referred to as the actual counting rate.
3.26
counting rate characteristic

relationship between the counting rate and, according to measurement method, the temperature or the

temperature difference

Note 1 to the term: A distinction is made between the scheduled counting rate characteristic intended during the

construction of the heat cost allocator and the actual counting rate characteristic in the appliance type. When determining

the relative display deviation (3.28), the value of the counting rate determined from the scheduled counting rate

characteristic at the temperatures of the operating state is referred to as the scheduled counting rate.

3.27
basic counting rate

value of the counting rate resulting from the scheduled counting rate characteristic at the temperature or

temperature difference of the base condition and a c-value of zero
Note 1 to the term: It serves to determine the rating factor K (see 5.3.2).
3.28
relative display deviation

difference between the actual counting rate and the scheduled counting rate related to the scheduled counting

rate
3.29
idle counting rate
counting rate at room temperature without thermal output from the radiator
3.30
reading

making available the displayed reading or the consumption values of the heat cost allocators for the purpose

of heat cost calculation
3.31
visual reading

reading by means of visually reading off values at the display device of the heat cost allocator

3.32
close-range reading

reading by means of data transfer, via an interface, to a reader device which is arranged within sighting

distance of the heat cost allocator
3.33
remote reading
reading by means of data transfer to a receiver
Note 1 to the term: Usually, the receiver is arranged outside the consumer unit.
3.34
reference output
thermal output of the radiator under prescribed operating conditions
---------------------- Page: 11 ----------------------
SIST EN 834:2013
EN 834:2013 (E)
3.35
reference system
Q(60 K), Q(50 K)

prescribed operating conditions of the radiator during the determination of the reference output

3.36
rating factors

factors by which the non-rated displayed reading values of the individual heat cost allocators are multiplied so

as to be able to be used as consumption values directly for the consumer-based billing of heat costs

3.37
rating factor for the thermal output of the radiator

non-dimensional numerical value of the reference output of the radiator expressed in watts or kilowatts

3.38
rating factor for the thermal coupling of the sensors

factor taking into account the different thermal coupling of the temperature sensors to the temperatures to be

registered for different types of heating surfaces
Note 1 to the term: See also 5.3.2, formula 5.
3.39
rating factor for rooms with low design indoor temperatures

factor taking into account the change of the thermal output and the change of the temperature of the sensors

where heat cost allocators according to the single-sensor measurement method are used at design indoor

temperatures less than the basic reference air temperature
3.40
resulting rating factor
product of the individual rating factors
Note 1 to the term: See also 5.3.3, formula 6.
3.41
calendar function

control of specific processes of the heat cost allocator as a function of the specific point in time within the

calendar year
3.42
transfer systems

any type of arrangement transferring signals between separately located assemblies of the heat cost allocator

3.43
manufacturer

person or organization responsible for the heat cost allocator system and the proper delivery and installation

of the heat cost allocator
3.44
thermal impact

influence of heat supply or heat accumulation on the heat cost allocator, acting in addition to the uninfluenced

heating operation

Note 1 to the term: Thermal impact can lead to incorrect displayed reading values.

...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.