SIST EN 12412-2:2003

Thermal performance of windows, doors and shutters - Determination of thermal transmittance by hot box method - Part 2: Frames

This European Standard specifies a method, based on EN ISO 8990 and EN ISO 12567-1, to measure the thermal transmittance of frame and sash components of windows and doors, including mullions and transoms.
The thermal bridging effect of window or door components (handles, hinges, closing devices, etc.) is included.
The test procedure is designed to take into account the whole developed area of the frame or sash surface, but excludes the influence of the thermal bridge introduced through the spacer in sealed glazing units.
Edge effects occurring outside of the perimeter of the specimen are excluded. Furthermore, energy transfer due to solar radiation is not taken into account, and air leakage is excluded.
The measurements are performed under defined conditions to facilitate the comparison of measured values.
Information on the design of the calibration transfer standard is given in EN ISO 12567-1.

Wärmetechnisches Verhalten von Fenstern, Türen und Abschlüssen - Bestimmung des Wärmedurchgangskoeffizienten mittels des Heizkastenverfahrens - Teil 2: Rahmen

Diese Norm legt ein Verfahren zur Messung des Wärmedurchgangskoeffizienten von Rahmen  und Flügelrahmen von Fenstern und Türen, einschließlich Kämpfer und Pfosten, auf der Grundlage von EN ISO 8990 und EN ISO 12567-1 fest.
Die Wirkung von Wärmebrücken von Fenster- oder Türbeschlägen (Drückern, Bändern, Schließeinrichtungen usw.) wird berücksichtigt.
Bei der Durchführung der Prüfung wird die gesamte abgewickelte Fläche des Schiebeflügels oder Flügelrahmens berücksichtigt, davon ausgeschlossen ist jedoch der Einfluss der Wärmebrücke, die durch die Abstandshalter bei Verbundglaseinheiten gebildet wird.
Die Messungen werden bei definierten Randbedingungen durchgeführt, um den Vergleich von Messwerten zu erleichtern.
Randeinflüsse, die außerhalb des Umfanges des Probekörpers liegen, werden ausgeschlossen. Ferner sind Energieübertragung infolge Sonnenstrahlung und Luftundichtigkeit nicht Gegenstand dieser Norm.
Informationen über die Konstruktion von Kalibrierpanelen sind in EN ISO 12567-1 zu finden.

Performance thermique des fenetres, portes et fermetures - Détermination du coefficient de transmission thermique par la méthode de la boîte chaude - Partie 2: Encadrements

La présente norme européenne spécifie une méthode fondée sur le prEN ISO 8990, pour mesurer le coefficient de transmission thermique des composants de dormants et ouvrants de fenetres et portes, y compris les traverses et les montants. Les mesurages se font dans des conditions qui sont représentatives de la pratique. Les effets de bord se produisent a l'extérieur du périmetre de l'éprouvette sont exclus. De meme, le transfert d'énergie du au rayonnement solaire n'est pas pris en compte, et les fuites d'air sont exclues.

Toplotne lastnosti oken, vrat in polken – Ugotavljanje toplotne prehodnosti z metodo komorne naprave – 2. del: Okvirji

General Information

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 91.060.50 - Doors and windows
• ICS: 91.120.10 - Thermal insulation of buildings
• Technical Committee: TOP - Thermal insulation
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2003
• Due Date: 01-Dec-2003
• Completion Date: 01-Dec-2003
• Directive: 89/106/EEC - Construction products
• Ref Project: EN 12412-2:2003 - Thermal performance of windows, doors and shutters - Determination of thermal transmittance by hot box method - Part 2: Frames

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 12412-2:2003
01-december-2003
Toplotne lastnosti oken, vrat in polken – Ugotavljanje toplotne prehodnosti z
metodo komorne naprave – 2. del: Okvirji
Thermal performance of windows, doors and shutters - Determination of thermal
transmittance by hot box method - Part 2: Frames
Wärmetechnisches Verhalten von Fenstern, Türen und Abschlüssen - Bestimmung des
Wärmedurchgangskoeffizienten mittels des Heizkastenverfahrens - Teil 2: Rahmen
Performance thermique des fenetres, portes et fermetures - Détermination du coefficient
de transmission thermique par la méthode de la boîte chaude - Partie 2: Encadrements
Ta slovenski standard je istoveten z: EN 12412-2:2003
ICS:
91.060.50 Vrata in okna Doors and windows
91.120.10 Toplotna izolacija stavb Thermal insulation
SIST EN 12412-2:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST EN 12412-2:2003

---------------------- Page: 2 ----------------------

SIST EN 12412-2:2003
EUROPEAN STANDARD
EN 12412-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2003
ICS 91.060.50
English version
Thermal performance of windows, doors and shutters -
Determination of thermal transmittance by hot box method - Part
2: Frames
Performance thermique des fenêtres, portes et fermetures - Wärmetechnisches Verhalten von Fenstern, Türen und
Détermination du coefficient de transmission thermique par Abschlüssen - Bestimmung des
la méthode de la boîte chaude - Partie 2: Encadrements Wärmedurchgangskoeffizienten mittels des
Heizkastenverfahrens - Teil 2: Rahmen
This European Standard was approved by CEN on 2 May 2003.
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 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 Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2003 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12412-2:2003 E
worldwide for CEN national Members.

---------------------- Page: 3 ----------------------

SIST EN 12412-2:2003
EN 12412-2:2003 (E)
Contents
Foreword . 3
Introduction. 4
1 Scope. 4
2 Normative references. 4
3 Terms, definitions, symbols, units and subscripts . 5
4 Principle . 6
5 Requirements for test specimen and apparatus. 6
5.1 General . 6
5.2 Surround panels. 6
5.3 Specimen requirements and location . 6
5.3.1 Complete frames for windows and doors. 6
5.3.2 Frame and sash, transom or mullion profile sections. 9
5.4 Calibration panels . 11
5.5 Temperature measurement and baffle positions . 11
6 Test procedure. 13
6.1 General . 13
6.2 Calibration measurements . 13
6.2.1 General . 13
6.2.2 Total surface resistance . 14
6.2.3 Surface resistances and surface coefficients of heat transfer. 15
6.2.4 Surround panel and edge effects . 16
6.3 Measurement procedure for test specimens. 17
7 Test report. 19
Annex A (normative) Determination of environmental temperature . 21
A.1 General . 21
A.2 Environmental temperature. 22
A.3 Mean radiant temperature . 22
A.4 Convective surface heat transfer coefficient . 23
Annex B (normative) Linear thermal transmittance of the edge zone . 25
Annex C (informative) Example of calibration test and measurement of frame specimen. 32
·
C.1 Calibration test with panel size 1,23 m 1,48 m . 32
C.2 Frame specimen measurement. 38
2

---------------------- Page: 4 ----------------------

SIST EN 12412-2:2003
EN 12412-2:2003 (E)
Foreword
This document EN 12412-2:2003 has been prepared by Technical Committee CEN /TC 89, "Thermal performance
of buildings and building components" the secretariat of which is held by SIS.
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 January 2004, and conflicting national standards shall be withdrawn at the latest by
January 2004.
This standard is one of a series of standards on calculation and measurement methods for the design and
evaluation of the thermal performance of buildings and building components.
Annexes A and B are normative. Annex C is informative.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal,
Slovakia, Spain, Sweden, Switzerland and the United Kingdom.
3

---------------------- Page: 5 ----------------------

SIST EN 12412-2:2003
EN 12412-2:2003 (E)
Introduction
The method given in this European Standard provides data on frames that can be used in calculations of the overall
thermal performance of windows and doors according to EN ISO 10077-1, Thermal performance of windows, doors
and shutters – Calculation of thermal transmittance – Part 1: Simplified method (ISO 10077-1).
1 Scope
This European Standard specifies a method, based on EN ISO 8990 and EN ISO 12567-1, to measure the thermal
transmittance of frame and sash components of windows and doors, including mullions and transoms.
The thermal bridging effect of window or door components (handles, hinges, closing devices, etc.) is included.
The test procedure is designed to take into account the whole developed area of the frame or sash surface, but
excludes the influence of the thermal bridge introduced through the spacer in sealed glazing units.
Edge effects occurring outside of the perimeter of the specimen are excluded. Furthermore, energy transfer due to
solar radiation is not taken into account, and air leakage is excluded.
The measurements are performed under defined conditions to facilitate the comparison of measured values.
Information on the design of the calibration transfer standard is given in EN ISO 12567-1.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For
dated references, subsequent amendments to or revisions of any of these publications apply to this European
Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the
publication referred to applies (including amendments).
EN 1946-4, Thermal performance of building products and components – Specific criteria for the assessment of
laboratories measuring heat transfer properties – Part 4: Measurements by hot box methods.
:
prEN 12519:1996 , Windows and doors – Terminology.
EN 12664, Thermal performance of building materials and products – Determination of thermal resistance by means
of guarded hot plate and heat flow meter methods – Dry and moist products of medium and low thermal resistance.
EN ISO 7345:1995, Thermal insulation – Physical quantities and definitions (ISO 7345:1987).
EN ISO 8990:1996, Thermal insulation – Determination of steady-state thermal transmission properties – Calibrated
and guarded hot box (ISO 8990:1994).
EN ISO 9288:1996, Thermal insulation – Heat transfer by radiation – Physical quantities and definitions
(ISO 9288:1989).
EN ISO 12567-1:2000, Thermal performance of windows and doors – Determination of thermal transmittance by hot
box method - Part 1: Complete windows and doors (ISO 12567-1:2000).
4

---------------------- Page: 6 ----------------------

SIST EN 12412-2:2003
EN 12412-2:2003 (E)
3 Terms, definitions, symbols, units and subscripts
3.1 Terms and definitions
For the purposes of this European Standard, the terms and definitions given in prEN 12519:1996,
EN ISO 7345:1995, EN ISO 8990:1996 and EN ISO 9288:1996 apply.
3.2 Symbols and units
Symbol Quantity Unit
2
A area m
d thickness or depth m
F fraction
-
f view factor
-
H height m
2
h surface coefficient of heat transfer
W/(m K)
L perimeter length m
l
length m
2
q density of heat flow rate W/m
2
R
thermal resistance m K/W
T thermodynamic temperature K
temperature difference K
D T, D q
2
U
thermal transmittance W/(m K)
v air velocity m/s
w width m
radiation factor
a -
hemispherical emissivity
e -
Celsius temperature °C
q
2
L thermal conductance W/(m K)
thermal conductivity
l W/(m K)
2 4
Stefan-Boltzmann constant
s W/(m K )
heat flow rate W
F
Y linear thermal transmittance W/(m K)
3.3 Subscripts
b baffle
c convection (air)
ca calibration
e external, usually cold side
ed edge zone
f frame
fi infill with known thermal properties
5

---------------------- Page: 7 ----------------------

SIST EN 12412-2:2003
EN 12412-2:2003 (E)
hb hot box
i internal, usually warm side
in input
m measured
me average/mean
n environmental (ambient)
ne environmental (ambient external)
ni environmental (ambient internal)
p reveal of surround panel
r radiation (mean)
s surface
sp specimen
sur surround panel
t total
4 Principle
The thermal transmittance of a frame is determined directly by measurement under standardised conditions using
the calibrated or guarded hot box method according to EN ISO 8990 and EN ISO 12567-1. The requirements of
EN ISO 8990 shall be complied with in addition to those given in this standard. The method may be applied to
complete window or door frames (see 5.3.1) or to profile sections including mullions, transoms etc. (see 5.3.2).
The surround panel is used to keep the specimen in a given position. It is constructed with outer dimensions of
appropriate size for the apparatus, having an aperture to accommodate the specimen (see Figures 1 to 5).
The principal heat flows through the surround panel and the calibration panel (or test specimen) are shown in Figure
8. The boundary edge heat flow due to the location of the calibration panel in the surround panel is determined
separately as a linear thermal transmittance, Y .
The procedure in this standard includes a correction for the boundary edge heat flow, so that standardized and
reproducible thermal transmittance properties are obtained.
The magnitude of the boundary edge heat flow as a function of geometry, calibration panel thickness and thermal
conductivity is determined by tabulated values given EN ISO 12567-1:2000, annex B.
5 Requirements for test specimen and apparatus
5.1 General
The test apparatus shall conform to the requirements specified in EN 1946-4, EN ISO 8990 and EN ISO 12567-1.
5.2 Surround panels
For details see EN ISO 12567-1:2000, 5.2.
5.3 Specimen requirements and location
5.3.1 Complete frames for windows and doors
Specimen sizes should be representative (typical) of those found in practice. For standardised tests on window
frames the overall sizes recommended are 1230 mm (width) by 1480 mm (height). Further requirements are laid
down in EN ISO 12567-1:2000, 5.3.
6

---------------------- Page: 8 ----------------------

SIST EN 12412-2:2003
EN 12412-2:2003 (E)
To ensure consistency of measurement, the specimen shall be located as follows. The specimen with panel shall fill
the surround panel aperture, which shall be located centrally. The internal frame face shall be as close to the face of
the surround panel as possible, but no part shall project beyond the surround panel faces on either the cold or warm
sides (see Figures 1, 2 and 3).
Dimensions in millimetres
Key
1 Infill element of insulating material
2 Adhesive tape
3 Aperture
4Warm side
5 Cold side
Figure 1 — Mounting of specimen in the aperture - Metal frame
7

---------------------- Page: 9 ----------------------

SIST EN 12412-2:2003
EN 12412-2:2003 (E)
Dimensions in millimetres
Key
1 Infill element of insulating material
2 Adhesive tape
3 Aperture
4Warm side
5 Cold side
Figure 2 — Mounting of specimen in the aperture - PVC frame
8

---------------------- Page: 10 ----------------------

SIST EN 12412-2:2003
EN 12412-2:2003 (E)
Dimensions in millimetres
Key
1 Infill element of insulating material
2 Adhesive tape
3 Aperture
4Warm side
5 Cold side
Figure 3 — Mounting of the specimen in the aperture - Wood frame
The aperture should be at least 200 mm from the inside surfaces of the cold and hot boxes to avoid or limit edge
heat flow corrections, and to allow room for the guarded hot box (where applicable).
Any glazing or opaque infill panels in windows and doors shall be replaced by insulating panels (see Figures 1, 2
and 3). Thermocouples to measure the surface temperature on the infill insulation shall be placed as shown in
Figure 6.
All surround panel thermocouples should be located centrally (see Figure 6).
For further information see EN ISO 12567-1.
5.3.2 Frame and sash, transom or mullion profile sections
The frame, mullion or transom of a window or door system shall be installed vertically in the surround panel
aperture. The internal specimen face shall be as close to the face of the surround panel as possible, but no part
shall project beyond the surround panel faces on either the cold or warm sides (see Figure 4).
9

---------------------- Page: 11 ----------------------

SIST EN 12412-2:2003
EN 12412-2:2003 (E)
Dimensions in millimetres
Key
1 Adhesive tape
2 Infill element of insulating material
3 Projected area A of the frame and infill insulation
t
4Warm side
5 Cold side
Figure 4 — Combination of sashes and frames
The frame area, A , is the larger of the two projected areas seen from both sides.
f
The length of the profile sections should be 1480 mm.
If the specimens usually form part of a combination of several frame profiles, e.g. sash and frame, the complete
units shall be tested, inclusive of any hinges, seals, etc.
The sash and frame profile sections shall be connected with at least two hinges. Additionally, the profile sections
shall be fixed without causing thermal bridging.
If the frame area forms less than 30 % of the aperture area of the hot box, two or more frames shall be installed so
that the total frame area is at least 30 % of the aperture area, with a recommended distance between profile
sections of 150 mm (see Figure 5).
Dimensions in millimetres
10

---------------------- Page: 12 ----------------------

SIST EN 12412-2:2003
EN 12412-2:2003 (E)
Key
1 Infill insulation
2Warm side
3 Cold side
a Recommended dimension
b The extent of penetration of the infill insulation may be smaller than 15 mm only if the design does not allow
15 mm; in that case the actual penetration depth shall be stated in the test report
Figure 5 — Installation of more than one frame section in the aperture
The connection of frame and insulating panels, and the joining of frames, are shown in Figures 4 and 5.
The surface of specimens shall be treated as for the normal application of the product.
The area remaining between the aperture of the hot box and the specimen shall be filled with an infill insulation with
known thermal conductivity. The thermal conductivity should not be higher than 0,035 W/(m K).
The thermal conductivity of the infill insulation shall be obtained by measurement according to EN 12664 (guarded
hot plate apparatus) or by using materials with certified properties from an accredited source.
Thermocouples to measure the surface temperature shall be centrally located as shown in Figure 7.
For further information see EN ISO 12567-1.
5.4 Calibration panels
The calibration panel shall be mounted as shown in Figure 8. For further details see 5.5 and EN ISO 12567-1:2000,
5.4.
5.5 Temperature measurement and baffle positions
For details see EN ISO 12567-1:2000, 5.6.
11

---------------------- Page: 13 ----------------------

SIST EN 12412-2:2003
EN 12412-2:2003 (E)
Dimensions in millimetres
Key
1 Cold side baffle
2 Warm side baffle
3 Air speed sensor
4 Temperature sensors (· )
5 Surround panel thermocouples
6 Test specimen
7 Infill insulation
Figure 6 — Location of temperature and air speed sensors for measurements on complete frames for
windows and doors
12

---------------------- Page: 14 ----------------------

SIST EN 12412-2:2003
EN 12412-2:2003 (E)
Key
1 Infill insulation
2 Test specimen
3 Temperature sensors (· )
4 Temperature sensors (· )
5 Surround panel
NOTE Dimension d is half of 1/3 of the height of the infill insulation
Figure 7 — Location of temperature sensors for measurements on profile sections
6 Test procedure
6.1 General
Except as provided herein, the test procedure shall conform with EN ISO 12567-1:2000, 6.2 and 6.3. An example of
the required calculations is given in annex C.
6.2 Calibration measurements
6.2.1 General
Calibration measurements are required to ensure that suitable test conditions are set up and that the surround panel
heat flow and surface heat transfer coefficients can be fully accounted for.
13

---------------------- Page: 15 ----------------------

SIST EN 12412-2:2003
EN 12412-2:2003 (E)
The calibration measurements shall be carried out at a minimum of six densities of heat flow rate, which cover the
required range of specimen testing.
The calibration measurements should be carried out at three different mean air temperatures q (where q is
c,me c,me
(q + q )/2) in steps of ± 5 K by varying the cold side air temperature, retaining constant conditions of air movement
c,i c,e
on the cold side and constant air temperature and natural convection on the warm side. By this procedure surface
resistances and coefficients of heat transfer can be determined as a function of the total density of heat flow rate
through the calibration panel.
NOTE It is considered that for non-homogeneous test specimens like window frames or door frames, the mean heat transfer
conditions over the measured area will be comparable to those of the given calibration panel.
6.2.2 Total surface resistance
6.2.2.1 Measurement
The calibration panels should be as specified in EN ISO 12567-1:2000, C.1 and the calibration measurements shall
be carried out as specified in EN ISO 12567-1:2000, 6.2 (see also Figure 8).
The first calibration test shall be made with the thin panel (d » 20 mm) at a mean temperature of approximately
ca
10°C and a temperature difference, D q between warm and cold sides, of (20 ± 2) K (see annex A for determination
c
of the environmental temperatures, EN ISO 8990:1996 and EN ISO 12567-1:2000, annex A).
The air velocity on the cold side shall be adjusted for the first calibration test by throttling or by fan speed adjustment
2
to give a total surface thermal resistance (warm and cold side) R = 0,17 ± 0,01 m K/W. Thereafter the fan speed
s,t
settings and/or the throttling devices shall remain constant for all subsequent calibration measurements. The set-up
used for the calibration procedure shall be used for all tests with specimens of frames.
6.2.2.2 Calculation
2
Calculate the total surface thermal resistance of the warm and cold side, R , expressed in m K/W, using
s,t
Equation (1):




-

s,ca
n,ca
(1)
=
Rs,t
q
ca
where
D q is the difference between the environmental temperatures on each side of the calibration panel, in K,
n,ca
calculated in accordance with annex A;
D q is the surface temperature difference of the calibration panel, in K;
s,ca
q is the density of heat flow rate of the calibration panel determined from the known thermal resistance,
ca
R , of the calibration panel (at the mean temperature, q ) and the surface temperature difference,
ca me,ca
D q , calculated by Equation (2).
s,ca

q
s,ca
(2)
=
q
ca
Rca
where R is the thermal resistance of the calibration panel at the mean temperature of the panel, calculated by
ca
Equation (3):
d
j
(3)
R =
ca
l
j
The total surface resistance, R , shall be plotted as a function of the density of heat flow rate, q through the
s,t ca

calibration panel. These characteristics are used to determine the total surface resistance for all subsequent
measurements on test specimens.
14

---------------------- Page: 16 ----------------------

SIST EN 12412-2:2003
EN 12412-2:2003 (E)
6.2.3 Surface resistances and surface coefficients of heat transfer
6.2.3.1 General
Surface coefficients of heat transfer (convective and radiative parts) are needed in order to determine the
environmental temperatures (according to the procedures given in annex A, EN ISO 8990 and EN ISO 12567-
1:2000, annex A). Surface temperature measurements on the calibration panel at different densities of heat flow rate
allows the determination of the surface coefficients of heat transfer. The surface resistances are calculated using
Equations (4) and (5).
q q

-

ni,ca si,ca
(4)
=
R
si, t
q
ca




-

ne,ca se,ca
= (5)
R
se, t
q
ca
where
2
q is the density of heat flow rate through the calibration panel, in W/m ;
ca
q is the environmental temperature of the warm side, in °C;
ni,ca
q is the warm side surface temperature of the calibration panel, in °C;
si,ca
q is the cold side surface temperature of the calibration panel, in °C;
se,ca
q is the environmental temperature of the cold side, in °C.
ne,ca
6.2.3.2 Convective fraction
Evaluate the radiative and convective parts of the surface coefficients of heat transfer from the calibration data for
the warm and cold side, according to the procedure given in annex A and EN ISO 12567-1:2000, annex A, and
determine the convective fraction F using Equation (6):
c
h
c
= (6)
F c
+
h h
c r
where
2
h is the convective coefficient of heat transfer, in W/(m K);
c
2
h is the radiative coefficient of heat transfer, in W/(m K).
r
The variation of the convective fraction, F shall be plotted for both sides as a function of q (density of heat flow
c ca
rate through the calibration panel). It will be used by interpolation for the determination of the environmental
temperatures of all subsequent measurements of test specimens using Equation (7):
q = F q + (1 - F ) q (7)
n c c c r
15

---------------------- Page: 17 ----------------------

SIST EN 12412-2:2003
EN 12412-2:2003 (E)
Dimensions in millimetres
Key
1 Surround panel
2 Calibration panel
3 Cold side
4Warm side
Figure 8 — Surround panel and boundary effects
6.2.4 Surround panel and edge effects
The major difference compared to the procedures given in EN ISO 12567-1 is that a correction for a change in the
total surface resistance is not made and so a graph of the density of heat flow rate against the total surface
resistance does not need to be drawn.
From the data set of the thicker calibration panel (d @ 60 mm), calculate and plot the thermal resistance of the
ca
surround panel, R , as a function of its mean temperature. From the heat flows shown in Figure 8, the
sur
Equations (8), (9) and (10) are derived:
A
q
sur s,sur
(8)
=
Rsur
F - F - F
in ca ed
where
16

---------------------- Page: 18 ----------------------

SIST EN 12412-2:2003
EN 12412-2:2003 (E)
2
A is the projected area of the surround panel, in m ;
sur
D q is the difference between the average surface temperatures of the surround panel, in K;
s,sur
F is the heat input to the metering box appropriately corrected for heat flow through the metering box walls
in
and the flanking losses, in W, (see EN ISO 8990);
F is the heat flow rate through the calibration panel, in W, given by:
ca
F = A q (9)
ca ca ca
where
2
A is the projected area of the calibration panel, in m ;
ca
2
q is the density of heat flow rate of the calibration panel, in W/m ;
ca
F is the heat flow rate through the edge zone between calibration panel and surround panel, in W, given
ed
by:
F = L Y D q (10)
ed ed ed c
where
L is the perimeter length between surround panel and specimen, in m;
ed
Y is the linear thermal transmittance of the edge zone between surround panel and specimen, in
ed
W/(m K); values of Y shall be taken from Table B.2 for measurements on complete frames described
ed

in 5.3.1 and Table B.3 for measurements on frame profiles described in 5.3.2;
D q is the difference between the warm and the cold side air temperatures, in K.
c
This calibration procedure allows the results from a given size of calibration panel to be applied to a different size of
test specimen without repeating the whole calibration measurement process.
NOTE 1 The calculation of environmental temperatures is described in EN ISO 12567-1:2000, annex A.
NOTE 2 If the internal and external projected areas are different, the larger of the two is used.
NOTE 3 A worked example is given in annex C.
6.3 Measurement procedure for test specimens
The measurement of the test specimens shall be made under the same conditions as those used in the
corresponding calibrations described in EN ISO 12567-1:2000, 6.2.1, at a mean temperature of approximately 10 C.
2
The density of heat flow rate q , expressed in W/m , through the infill insulation and frame during the measurement
t
shall be calculated using Equation (11):
F - F - F
in sur ed
q = (11)
t
A
t
where
2
A is the projected area of the frame and the infill area, in m ;
t
F is the heat input to the metering box appropriately corrected for heat flow through the metering box
in
walls and the flanking losses, in W; (see EN ISO 8990:1996, 2.9.3.3);
17

---------------------- Page: 19 ----------------------

SIST EN 12412-2:2003
EN 12412-2:2003 (E)
F is the edge zone heat flow rate according to Equation (10), in W; the actual value for Y shall be taken
ed ed
from Tables B.2 or B.3;
F is the heat flow rate through the surround panel, in W, given by:
sur
A
q
sur s,sur
 = (12)
sur
R
sur
where
D q is the difference between the environmental temperatures on each side of the system under test,
n
in K;
2
A is the projected area of the
...