EN 50559:2013
(Main)Electric room heating, underfloor heating, characteristics of performance - Definitions, method of testing, sizing and formula symbols
Electric room heating, underfloor heating, characteristics of performance - Definitions, method of testing, sizing and formula symbols
This European Standard applies to electrical underfloor heating of dwellings and all other buildings whose use corresponds to dwellings or is at least similar, having a maximum load bearing in use of 4 kN/m². This European Standard defines the main characteristics of electrical underfloor heating and establishes the method of testing of these characteristics as information for the user. This European Standard does not deal with: - installation and safety requirements; DIN VDE 0100-723.
Elektrische Raumheizung, Fußbodenheizung, Charakteristika der Gebrauchstauglichkeit - Definitionen, Prüfverfahren, Dimensionierung und Formelzeichen
Chauffage électrique de locaux - Chauffage par le sol - Caractéristiques de performance - Définitions, méthode d'essai, calibrage et symboles de formule
Električno ogrevanje prostorov, talno ogrevanje, značilne lastnosti - Definicije, metode preskušanja, dimenzioniranje in simboli formul
Ta evropski standard velja za električno talno ogrevanje stanovanj in vseh ostalih stavb, ki ustrezajo stanovanjem ali so jim vsaj podobne ter imajo največjo nosilnost 4 kN/m². Ta evropski standard določa značilnosti električnega talnega ogrevanja in uvaja preskusno metodo za te značilnosti, ki služi kot informacija za uporabnika. Ta evropski standard ne obravnava:
– namestitev in varnostnih zahtev;
– DIN VDE 0100-723.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2013
(OHNWULþQRRJUHYDQMHSURVWRURYWDOQRRJUHYDQMH]QDþLOQHODVWQRVWL'HILQLFLMH
PHWRGHSUHVNXãDQMDGLPHQ]LRQLUDQMHLQVLPEROLIRUPXO
Electric room heating, underfloor heating, characteristics of performance - Definitions,
method of testing, sizing and formula symbols
Elektrische Raumheizung, Fußbodenheizung, Charakteristika der Gebrauchstauglichkeit
- Definitionen, Testmethoden, Dimensionierung und Formelsymbole
Chauffage électrique de locaux - Chauffage par le sol - Caractéristiques de performance
- Définitions, méthode d'essai, calibrage et symboles de formule
Ta slovenski standard je istoveten z: EN 50559:2013
ICS:
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
97.100.10 (OHNWULþQLJUHOQLNL Electric heaters
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN 50559
NORME EUROPÉENNE
May 2013
EUROPÄISCHE NORM
ICS 97.100.10
English version
Electric room heating, underfloor heating, characteristics of performance -
Definitions, method of testing, sizing and formula symbols
Chauffage électrique de locaux - Elektrische Raumheizung,
Chauffage par le sol - Fußbodenheizung, Charakteristika der
Caractéristiques de performance - Gebrauchstauglichkeit -
Définitions, méthode d'essai, calibrage et Definitionen, Testmethoden,
symboles de formule Dimensionierung und Formelsymbole
This European Standard was approved by CENELEC on 2012-12-24. CENELEC 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 CENELEC 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 CENELEC member into its own language and notified
to the CEN-CENELEC Management Centre has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany,
Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels
© 2013 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50559:2013 E
Contents Page
Foreword .6
Introduction .7
1 Scope .8
2 Normative references .8
3 Terms and definitions .8
4 Method of testing for the determination of characteristics of performance .16
4.1 General .16
4.2 Standard heating load per unit area .16
4.3 Maximum power rating per unit area .16
4.4 Maximum surface temperature .16
4.5 Maximum floor surface temperature for underfloor storage heating.18
4.6 Room air temperature .19
4.7 Internal surface temperatures on the surrounding surfaces of the room .19
4.8 Thermal pre-conditioning of the room to be tested .19
4.9 Floor temperature in the case of continuous local hot spots .20
4.10 Floor temperature of underfloor storage heating through failure of a switching, controlling or
regulation apparatus .22
4.11 Floor temperature of controlled underfloor heating and underfloor direct heating through
failure of a switching, controlling or regulation apparatus .22
4.12 Regulation of room temperature using peripheral areas for underfloor storage heating .22
4.13 Regulation of room temperature using controlled underfloor heating and underfloor direct
heating .22
4.14 Regulation of room temperature using underfloor warming .23
4.15 Relationship of coefficients of heat transfer.23
4.16 Insulating layers .23
4.17 Edging insulation strips .24
4.18 Damp-proofing .24
4.19 Electrical auxiliary heating .24
4.20 Load distribution layer in electrical underfloor heating .25
4.21 Bedding in or under heating screed or directly below floor covering .25
4.22 Dry laying of electrical heating elements .25
4.23 Heating element .25
4.24 Heating cable and laminar heating element .25
4.24.1 Heating cable for bedding in or under screeding or directly below floor covering .25
4.24.2 Heating cable for dry Laying .25
4.24.3 Laminar heating elements for installation below or in screeding .25
4.25 Characteristics of heating cables .25
4.26 Characteristics of laminar heating elements.26
4.27 Cold tails .26
4.28 Point of connection .26
4.29 Bending radius of the heating cable . 26
4.30 Heating element labelling . 26
4.31 Pulsation factor . 26
4.32 Installation of heating elements for underfloor direct heating . 26
4.33 Adhesive and fixing material . 26
4.34 Permanent installation areas . 26
4.35 Pre-heating of screeding . 27
4.36 Floor coverings . 27
4.37 Control and regulation equipment . 27
4.38 Control and regulation equipment for underfloor storage heating . 27
4.39 Control and regulation equipment for controlled underfloor heating and underfloor direct
heating . 27
4.40 Floor temperature measurement . 27
4.41 Auxiliary supply period . 27
4.42 Period of room use . 27
4.43 Insulation and dielectric resistance of the heating element . 28
4.44 Instructions for construction workers . 28
4.44.1 Protective Measures when Pouring Flooring Screed. . 28
4.44.2 Pouring the Screed . 28
4.45 Data for owner and user of the building . 28
4.46 Report of testing . 29
Annex A (informative) Sizing Procedure Range of application and purpose . 30
A.1 General . 30
A.2 Basic principles Basic parameters of the room to be heated . 30
A.2.1 General . 30
A.2.2 Standard heat load of an underfloor heated room . 30
A.2.3 Standard heating load per unit area . 30
A.2.4 Effective heat storage capacity of the room to be heated . 31
A.2.5 Peripheral conditions and limiting values . 31
A.3 Sizing an underfloor heating system . 32
A.3.1 Storage layer depth of an underfloor heating system . 32
A.3.2 Heat Load Coverage for the underfloor heated room. 32
Annex B (informative) Sizing procedure Examples of sizing procedure of an underfloor storage
heating system Example for a living area . 45
B.1 General . 45
*
B.2 Standard heat load of an underfloor heated room . 45
Q
N
*
B.3 Standard heat load per unit area . 45
q
N
B.4 Storage mass per unit external area of the room m/ΣA . 45
a
B.5 Thickness of storage layer δ . 46
B.6 Relation of coefficients of conductivity . 46
′
B.7 Maximum rating per unit area P .47
F
′
B.8 Limited rating per unit area P .47
FE
B.9 Heating floor area A .47
F
B.10 Permissible rating P .47
ZUL
B.11 Rating of the room P .47
′
B.12 Rating per unit area P .47
IN
B.13 Mean heating capacity Q .47
F
B.14 Auxiliary heating capacity Q .48
Z
B.15 Auxiliary heat rating .48
Annex C (informative) Sizing procedure Example of sizing procedure of an underfloor direct
heating system Example for a living area .49
C.1 General .49
*
C.2 Design heating capacity Q of a room with underfloor direct heating .49
H
*
C.3 Design heating capacity per unit area q .49
H
C.4 Depth of the heating screed.50
C.5 Relation of coefficients of conductivity .50
′
C.6 Maximum rating per unit area P .51
F
′
C.7 Limited rating per unit area P .51
FE
C.8 Heating floor area A .51
F
C.9 Permissible rating P .51
ZUL
C.10 Rating of the room P .51
C.11 Rating per unit area P′ .51
IN
C.12 Mean heating capacity Q .51
F
C.13 Auxiliary heating capacity Q .52
Z
Formula symbols and units .53
Bibliography .55
Figure 1 Layout diagram of an underfloor heating system .12
Figure 2 Construction „A“, Cross-section A – B .13
Figure 3 Construction “B“, Cross-section A – B .13
Figure 4 Construction “C” Cross-section A – B .14
Figure 5 Examples for the effect of floor excess temperature TE .16
Figure 6 Basic circuit diagram of underfloor storage heating .17
Figure 7 Underfloor direct heating, controlled underfloor heating and warming Example of a
circuit for individual room regulation. Rooms have one heating circuit each .19
Figure 8 Construction of model .20
Figure A.1 Monogram for determining the storage layer depth . 30
Figure A.2 Electric underfloor storage heating, sizing chart . 32
Figure A.3 Electric underfloor direct and controlled heating, sizing chart . 33
Figure A.4 Plan of basement. 39
Figure A.5 Plan of ground floor . 40
Figure A.6 Plan of upper floor . 41
Figure A.8 Cross section C – D. 43
Figure B.1 Ceiling construction . 44
Figure C.1 Ceiling construction . 48
Table 1 Minimum coefficient of heat transfer and minimum resistance to thermal conductivity of
construction elements . 23
ϑϑ– ´ =0K
Table A.1 . 34
ϑϑ– ´ =5K
Table A.2 . 34
ϑϑ– ´ =10K
Table A.3 . 34
ϑϑ– ´ =15K
Table A.4 . 34
ϑϑ– ´ =20K
Table A.5 . 35
ϑϑ– ´ =30K
Table A.6 . 35
ϑϑ– ´ =35K
Table A.7 . 35
ϑϑ– ´ =38K
Table A.8 . 35
*
q
N
Table A.9 Factor of limitation C in relation to standard heat load per unit area . 36
Table B.1 Determination of heat conductivity coefficient Uo . 45
Table B.2 Determination of heat conductivity coefficient Uu . 45
Table C.1 Determination of heat conductivity coefficient Uo . 49
Table C.2 Determination of heat conductivity coefficient Uu . 49
Foreword
This document (EN 50559:2013) has been prepared by CLC/TC 59X "Performance of household and similar
electrical appliances".
The following dates are fixed:
(dop) 2013-12-24
• latest date by which this document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2015-12-24
standards conflicting with this
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights.
Introduction
No draft of this present preliminary standard has been published.
A preliminary standard is the result of standardisation work which, due to certain reservations about the
contents or due to a compilation process deviating from a standard, has not yet been published by DIN.
The national working body UK 513.4 „Raumheizgeräte“ (Room Heating) of the DKE Deutsche Kommission
Elektrotechnik Elektronik Informationstechnik im DIN und VDE (http://www.dke.de) is responsible for this
preliminary standard.
In cases of a dated reference in the normative text, the reference is always applied to the issue being referred
to.
The correlation between the quoted standard and the relevant German Standard is given in so far as a
correlation exists, fundamentally by means of the number of the relevant IEC-Publication.
Example: IEC 60068 has been taken over by CENELEC as EN 60068, and incorporated into the German
Standards as DIN EN 60068.
1 Scope
This European Standard applies to electrical underfloor heating of dwellings and all other buildings whose use
corresponds to dwellings or is at least similar, having a maximum load bearing in use of 4 kN/m².
This European Standard defines the main characteristics of electrical underfloor heating and establishes the
method of testing of these characteristics as information for the user.
This European Standard does not deal with:
- installation and safety requirements;
- DIN VDE 0100-723.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
EN 1264-1, Water based surface embedded heating and cooling systems Part 1: Definitions and symbols
EN 1264-2, Water based surface embedded heating and cooling systems Part 2: Floor heating: Prove
methods for the determination of the thermal output using calculation and test methods
EN 1264-3, Water based surface embedded heating and cooling systems Part 3: Dimensioning
EN 1264-4, Water based surface embedded heating and cooling systems Part 4: Installation
EN 1264-5, Water based surface embedded heating and cooling systems Part 5: Heating and cooling
surfaces embedded in floors, ceilings and walls Determination of the thermal output
EN 12831, Heating systems in buildings Method for calculation of the design heat load
EN 60335-2-96, Household and similar electrical appliances Safety Part 2-96: Particular requirements
for flexible sheet heating elements for room heating (IEC 60335-2-96)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
electrical underfloor heating system
electrical underfloor heating, the switching, control and regulation appliances and the electrical installation
3.1.1
underfloor heating
in situ flooring constructed as a heating system
Note 1 to entry: It is generally laid on a dry, level, load-bearing substructure.
3.1.2
underfloor direct heating
underfloor direct heating, by which the heat generated from electrical energy is transferred with the least
possible time lag to the room to be heated mainly via the surface of the floor
Note 1 to entry: There is no restriction on the amount of time electrical energy can be converted into heat.
3.1.3
underfloor warming
underfloor warming increases comfort by means of pleasant warmth on the feet
Note 1 to entry: It is not necessary to calculate the heat load of the room and the insulating layers as the underfloor
warming is not considered when calculating the heat load of the room.
3.1.4
controlled underfloor heating
underfloor heating, by which the heat generated from electrical energy is transferred with the least possible
time lag to the room to be heated mainly via the surface of the floor
Note 1 to entry: The conversion of electricity into heat may be interrupted - for no longer than 2 h continuously - no
longer than 8 h total in a 24 h period. The period of use will be equivalent to at least the previous period of interruption.
3.1.5
underfloor storage heating
underfloor heating, by which the electrical energy is converted into heat and transferred with an intended time
lag to the room to be heated mainly via the surface of the floor
Note 1 to entry: The charging takes place during the charging time period t and, as a rule, during an additional
F
charging time t of minimum 2 h.
ZF
3.1.6
underfloor storage heating system
underfloor heating, auxiliary heating, the switching, control and regulation appliances and the electrical
installation
3.1.7
electrical auxiliary heating
necessary heating equipment with a rating Q in the room being heated, additional to, and different from, the
Z
underfloor heating (e.g. periphery heating, convector panels, etc.)
3.1.8
heating circuit
independently switched, regulated or controlled section of an underfloor heating system
3.2
duration of design charge
duration of the charge for which the storage heating system is designed and which is determined as the basis
for testing
Note 1 to entry: It constitutes the largest continuous charging time within a period of 24 h.
3.3
auxiliary charge
sum of the auxiliary charging times occurring between two design charge times
3.4
designed rating of a heating element
manufacturer’s stated power rating for the heating element in W at the design voltage
3.5
capacity of a room
capacity in W of underfloor heating in a room is the sum of the measured power ratings of the installed
heating elements of an underfloor heating system in that room
3.6
design temperature ϑ
N
highest permissible heating cable nominal temperature in °C, taking into consideration the specific operating
properties, such as heat resistance of heat and sound insulation materials
Note 1 to entry: The design limiting temperature is the highest permissible temperature which is allowed for by the
manufacturer of the surface heating element.
3.7
maximum surface temperature
temperature which, for physiological purposes, cannot be exceeded on the uncovered upper surface of the
flooring
Note 1 to entry: This temperature may be exceeded in peripheral areas.
3.8
standard internal temperature
value of the room temperature necessary for the calculation, ϑ in °C; is the resulting temperature, defined as
i
the mean of the dry air temperature and the mean radiant temperature
3.9
standard heat load of an underfloor heated room
*
Q the standard heat load of an underfloor heated room, is used only to size the underfloor heating
N
*
Q
N
Note 1 to entry: Its value (as with that of the standard heat load of an underfloor heated room ) in W, is calculated
using EN 12831, taking into account the partially limited heating of the rooms in the dwelling. Areas of the room which
are equipped with surface heating elements (Flooring, Ceiling) remain unconsidered. To differentiate between the
*
standard heat load Q in W this value will be denoted as the standard heat load of an underfloor heated room, Q in
N
N
W.
3.10
*
standard heat load per unit surface area q
N
Q 2
N
standard heat load related to the area of the flooring surface A of the room to be heated, in W/m
Q
*
N
q =
N
A
3.11
*
design heating capacity of a room with an underfloor direct heating System Q
H
*
design heating capacity of a room with underfloor direct heating in W in accordance with EN 12831,
Q
N
which is also valid for controlled underfloor heating
3.12
*
design heating capacity per unit area of a room with an underfloor direct heating system q
H
*
design heating capacity of a room with underfloor direct heating Q in relation to its floor area A in m , in
H
W/m
3.13
maximum capacity per unit area P
F
largest possible capacity in W/m which can be installed, taking into account the maximum surface
temperature, the construction of the underfloor heating system and the energy supply charging time
3.14
capacity per unit area
capacity P in W in relation to the floor area to be heated A
F
P
P =
IN
A
F
3.15
mean heating capacity
average heating capacity in W of the heating floor area for a given time, taking into account the floor upper
surface temperature, the standard room temperature and the mean temperature on the inside surfaces of
walls and ceilings
3.16
mean heat flow density
q
F
heat flow per surface area in W/m from the floor to the heated room
3.17
localised hot spots
occur when the floor area is covered with a highly insulating material (such as cushions or mattresses) or by
defective switching, regulation or control apparatus. This results in an undue thermal strain on the underfloor
heating
3.18
effective heat storage capacity for underfloor storage heating
partial amount of the heat storage capacity of a building (room) in W/m K, having an influence on the heat
load
Note 1 to entry: Evaluation, see EN 12831 and DIN V 4108-6:2003-06, 6.5.2.
3.19
storage mass of a heated room in relation to external surface
m/∑A in kg/m is the Quotient of the storage mass of the room m in kg and the sum of the external surfaces
a
of the room ∑A in m
a
3.20
permanent fixture area
non-heating area of the floor surface which is designated for full-surface mounting or the installation of
furnishings
Note 1 to entry: The floor areas in WC, shower or bathroom, on which bathroom fittings such as WC, shower or bathtub
are to be installed, count as permanent fixture areas.
3.21
peripheral zone area A
R
floor area with a maximum width of 1 m which heats at a higher temperature, generally in front of glazed
external walls or external doors
Note 1 to entry: This is not deemed to be an area of permanent dwelling; in m .
3.22
dwelling area A
V
area of permanent residing within the heating floor area
Note 1 to entry: It is the product of the heating floor area minus the border area, in m .
3.23
components of electric underfloor heating
• insulating layer (for heat- and soundproofing);
• damp proofing;
• heating element;
• heat and load distribution layer;
• floor covering
3.24
insulating layer
heat insulation below the flooring, which can also serve as sound proofing
3.25
damp proofing
layer of material that serves to prevent the insulating layer becoming damp from the water used to mix the
flooring screed and also to prevent mortar pollution
Note 1 to entry: At the same time it prevents the heating cables from sinking into open joints in the insulation.
3.26
heating element
combination of a heating cable or laminar heating element and, if applicable, its cold tails which connect it to
the terminals of the electrical installation
3.26.1
heating conductor
electrically conducting component of the heating cable in which electrical energy is directly converted into heat
3.26.2
heating cable
insulated heating conductor
3.26.3
laminar heating conductor
electrically conducting planar component of a laminar heating element serving the direct conversion of
electrical energy into heat
3.26.4
laminar heating element
insulated laminar heating conductor. Contact strips provide power supply
3.26.5
heating loop
heating element comprising a heating cable and its connected cold tails, whose geometric fixing takes place
during the installation of the system
3.26.6
heating mat
combination of one or more heating elements, geometrically fixed by the manufacturer using suitable
equipment
3.26.7
cold tail
insulated conductor providing the connection between the heating cable and the terminals of the electrical
installation, at the same time preventing an undue warming of the terminals on the supply side
3.26.8
point of connection
connection (e.g. coupling sleeve) between a heating cable or laminar heating element and its cold tail
3.27
load distribution layer in electric underfloor heating
for example heating screed
Note 1 to entry: See EN 1264-1.
3.28
storage layer
comprises the heating screed, floor covering and all other construction elements above the heating layer
which have heat conductivity values of λ ≥ 1,0 W/(m ⋅ K)
3.29
floor covering
upper layer of the underfloor heating able to be walked upon
3.30 Laying methods
3.30.1
bedding in heating screed
the heating element is bedded directly in the freshly laid heating screed as shown in Figure 2 construction “A“
(corresponding to Type A in EN 1264)
3.30.2
bedding below heating screed
the heating element is bedded directly below, or only partially in the fresh heating screed as shown in Figure 3,
construction “B“. The heating screed can have a separating layer (corresponding to Type C in EN 1264)
Key
d = depth of heating screed
Figure 1 Layout diagram of an underfloor heating system
Figure 2 Construction „A“, Cross-section A – B
3.30.3
dry laying of electrical heating elements
the heating element is laid in pre-fabricated, grooved slabs, tubes or canals below, or in the heating screed.
The heating element does not come into contact with the heating screed
3.30.4
bedding directly below the floor covering
the heating element is laid on the existing sub-structure (e.g. screeding) as shown in Figure 4, construction
“C“. It is normally fixed to the sub-structure with grouting
Note 1 to entry: It is normally fixed to the sub-structure with grouting.
3.31
pulsation factor ∆ϑ
F
maximum temperature difference in Kelvin which can occur on the upper surface of a flooring within the
dwelling area, in K
Figure 3 Construction “B“, Cross-section A – B
Figure 4 Construction “C” Cross-section A – B
3.32 Control and regulation equipment
3.32.1
weather sensor
component which measures prevailing weather conditions (e.g. outside temperatures) and transmits these
values as reference input to other components of the charge control
3.32.2
floor temperature sensor
floor temperature sensor is a component which measures the temperature of a fixed point in the heating floor
surface and transmits this value as a reference input to other components of the charge control/regulator
3.32.3
floor temperature limiter
floor temperature limiter is an operating temperature limiter as defined in EN 60730-1
Note 1 to entry: It is a self-resetting component with which the temperature at a fixed point in the heating floor surface
is kept below a set value by automatically controlling the heating system.
3.32.4
floor temperature regulator
floor temperature regulator is a component which maintains the temperature of the floor temperature sensor
within settable limits by automatically controlling the heating system
3.32.5
room temperature regulator
room temperature regulator is a component which maintains the temperature of the room air within settable
limits by automatically controlling the heating system
3.32.6
supply period
t
F
largest possible continuous period of time, in which during a time-period of 24 h electrical energy can be
obtained for the underfloor heating at its point of installation
Note 1 to entry: In practical operation the supply period can either be continuous or, for reasons of load control in
supply networks, divided into individual sectors.
3.32.7
auxiliary supply period
t
ZF
sum of the additional periods, between two supply periods, in which electrical energy is supplied for underfloor
heating, in hours
3.32.8
period of room use
t
B
period for which the underfloor heating system is designed, in hours
4 Method of testing for the determination of characteristics of performance
4.1 General
Electrical underfloor heating systems are deemed to be a fixed component of the building to be heated. The
testing of underfloor heating systems and their conformity to sizing standards shall be confirmed by calculation
and if necessary by measurement. A confirmation by measurement of the installed system should only be
carried out in justifiable cases.
4.2 Standard heating load per unit area
In consideration of functionality, efficiency and maintenance of hygienic conditions, the standard heating load
per unit area of dwellings and buildings with similar use heated by underfloor heating should not exceed
2 * 2
70 W/m . The standard heating load per unit area of an individual room q in W/m may in exceptional
N
circumstances exceed this value when justified by the heat load calculation according to appendix A.
4.3 Maximum power rating per unit area
The maximum power rating per unit area shall be selected so that even at localised hot spots no damage can
occur on the underside of the load distribution layer. An additional localised hot spot above the intended floor
covering is assumed to exist due to covering by an additional insulating layer with a resistance to heat
conductivity of
m ×K
R =2
λ
W
(Corresponds to e.g. 0,08 m of a material with λ = 0,04 W/(m K))
Limiting values of the maximum power rating based on surface are to be found in Appendix A of this
European Standard, Tables A.1 to A.8.
The rating of the room shall be determined. The rating per unit area P′ in W/m is:
IN
P
′
P =
IN
AF
4.4 Maximum surface temperature
The temporal average temperature difference between floor surface and room air temperature during usage
time in dwelling areas is
- not more than 6,5 K for underfloor storage heating,
- not more than 9,0 K for underfloor direct heating and controlled underfloor heating.
The value of the average heat flow density is based on this temperature difference.
The mean surface temperature shall be measured in the actual condition of the room (condition of use). It
shall be determined whether the actual and designed conditions of the floor covering are correspondent. The
surface temperature in shall be measured and recorded at a minimum of 5 random points in dwelling areas, in
peripheral areas at a minimum of 3 random points, which are at least 0,4 m from lateral confinements of the
heating area. Measurements shall not be carried out at points whose temperature can be influenced by
outside sources, e.g. sun’s rays.
The measurement of temperature should take place using a non-contact radiant thermometer, vertical to the
area of measurement. The limit of error of the measuring instrument measured on a black radiator should be
± 0,5 K at a housing temperature of 15 °C to 35 °C.
The measurement area on the flooring shall have a diameter of 0,2 m ± 10 %.
in °C during the period of use of the room shall be calculated and
The mean surface temperature ϑ
FM
recorded from the values measured at 08:00, 13:00 and 19:00 hours for every point of measurement.
Key
1 storage Layer Depth e.g. δ = 0,06 m
2 storage Layer Depth e.g. δ = 0,12 m
.
floor covering: carpet 0,006 m, λ = 0,05 W/ (m K)
∆t duration of exceeding 26,5 °C within the period of use
ϑ maximum floor surface temperature within the period of use
Fmax
hatched area = T
E
Figure 5 Examples for the effect of floor excess temperature T
E
ϑϑ++ ϑ
FF(8) (13) F(19)
ϑ =
Fm
The testing is only to be carried out when on two consecutive days immediately before the testing and on the
day of testin
...
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