SIST EN 13384-2:2003
(Main)Chimneys - Thermal and fluid dynamic calculation methods - Part 2: Chimneys serving more than one heating appliance
Chimneys - Thermal and fluid dynamic calculation methods - Part 2: Chimneys serving more than one heating appliance
This European Standard specifies methods for calculation of the thermal and fluid dynamic characteristics of chimneys serving more than one heating appliances. A chimney is serving more than one appliance when either it is connected with more than one flue pipe to the appliances or there is one or more flue pipes connected with more than one appliances. This standard deals with chimneys with negative and positive pressure conditions and is valid for chimneys serving heating appliances for liquid, gazeous and solid fuels.
Abgasanlagen - Wärme- und strömungstechnische Berechnungsverfahren - Teil 2: Abgasanlagen mit mehreren Feuerstätten
Dieser Teil der Normreihe 13384 legt Berechnungsmethoden für die wärme- und strömungstechnischen Eigen-schaften von mehrfach belegten Abgasanlagen fest. Dieser Normteil umfaßt zwei Fälle:
(1) Abgasanlagen in die mehrere Verbindungsstücke von einzelnen oder mehreren Wärmeerzeugern in Mehrfach-anordnung münden.
(2) Abgasanlagen in die ein bestimmtes Verbindungsstück münden, das mehrere Wärmerzeuger in Kaskaden-schaltung verbindet.
Der Fall von Mehrfachanschlüssen von Kaskadenschaltungen ist durch Fall (1) abgedeckt.
Dieser Teil der Normreihe EN 13384 befaßt sich mit Unterdruck-Abgasanlagen und gilt für Abgasanlagen an die Wärmeerzeuger für flüssige, gasförmige und feste Brennstoffe angeschlossen werden.
Dieser Teil der Normreihe EN 13384 gilt nicht für:
3 Abgasanlagen mit unterschiedlichen Wärmedurchlasswiderständen oder unterschiedlichen Querschnitten in den verschiedenen Abschnittten der Abgasanlage. Energiegewinne werden durch diesenTeil der Normreihe nicht berücksichtigt.
3 Abgasanlagen für offene Feuerstätten, z.B. offene Kamine oder Abgaseinleitungen in die Abgasanlage, die bestimmungsgemäß offen im Raum betrieben werden.
3 Abgasanlagen für ein Gemisch aus Abgasen von Ventilator unterstützten-oder Überdruckbrennern oder Naturzugkesseln.
3 Abgasanlagen mit Mehrfachanschlüssen aus mehr als 5 Geschossen (dies gilt nicht für Luft-Abgasanlagen).
Abgasanlagen an die Wärmerzeuger angeschlossen werden, denen die Zuluft über Zuluftöffnungen oder Zuluftkanäle zugeführt wird, die sich nicht druckmässig im gleichen Luftverbund befinden (z.B. auf der gleichen Seite des Gebäudes).
Conduits de fumée - Méthodes de calcul thermo-aéraulique - Partie 2: Conduits de fumée desservant plus d'un appareil de chauffage
La présente partie de la norme EN 13384 définit des méthodes de calcul des caractéristiques thermo aérauliques de conduits de fumée desservant plusieurs générateurs de chaleur.
Cette partie de la norme EN 13384 traite des deux cas suivants :
(1) cas où le conduit de fumée est relié à plusieurs conduits de raccordement partant d'un ou de plusieurs générateurs de chaleur dans un système multientrées ou
(2) cas où le conduit de fumée est relié à un seul conduit de raccordement reliant plusieurs générateurs de chaleur dans un système en cascade.
Le cas du système multientrées en cascade est couvert par le cas (1).
La présente partie de la norme EN 13384 traite des conduits de fumée fonctionnant dans des conditions de pression négative et elle s'applique à des conduits desservant des générateurs de chaleur pour combustibles liquides, gazeux et solides.
Cette partie de la norme EN 13384 ne s'applique pas aux conduits de fumée suivants :
conduits de fumée présentant une résistance thermique différente ou une section différente dans les différents segments du conduit de fumée. Cette partie ne s’applique pas pour le calcul du gain énergétique.
conduits avec foyer ouvert, par exemple conduits de cheminées d'appartements ou entrées de conduits de fumée normalement conçues pour fonctionner ouvertes sur la pièce ;
conduits desservant une combinaison d'appareils de chauffage ventilés, d'appareils à tirage forcé ou d'appareils à tirage naturel. Les appareils ventilés possédant un régulateur de tirage entre le ventilateur et le conduit de fumée sont considérés comme des appareils à tirage naturel ;
conduits multi-entrées desservant plus de 5 étages. (Ceci ne s'applique pas au conduit de fumée collectif «équilibré» pour appareils étanches) ;
Dimniki – Računske metode termodinamike in dinamike fluidov – Dimniki za več kot eno ogrevalno napravo
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 13384-2:2003
01-september-2003
'LPQLNL±5DþXQVNHPHWRGHWHUPRGLQDPLNHLQGLQDPLNHIOXLGRY±'LPQLNL]DYHþ
NRWHQRRJUHYDOQRQDSUDYR
Chimneys - Thermal and fluid dynamic calculation methods - Part 2: Chimneys serving
more than one heating appliance
Abgasanlagen - Wärme- und strömungstechnische Berechnungsverfahren - Teil 2:
Abgasanlagen mit mehreren Feuerstätten
Conduits de fumée - Méthodes de calcul thermo-aéraulique - Partie 2: Conduits de
fumée desservant plus d'un appareil de chauffage
Ta slovenski standard je istoveten z: EN 13384-2:2003
ICS:
91.060.40 Dimniki, jaški, kanali Chimneys, shafts, ducts
SIST EN 13384-2:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 13384-2:2003
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SIST EN 13384-2:2003
EUROPEAN STANDARD
EN 13384-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2003
ICS 91.060.40
English version
Chimneys - Thermal and fluid dynamic calculation methods -
Part 2: Chimneys serving more than one heating appliance
Conduits de fumée - Méthodes de calcul thermo-aéraulique Abgasanlagen - Wärme- und strömungstechnische
- Partie 2: Conduits de fumée desservant plus d'un appareil Berechnungsverfahren - Teil 2: Abgasanlagen mit
de chauffage mehreren Feuerstätten
This European Standard was approved by CEN on 11 March 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, Slovak Republic, 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 13384-2:2003 E
worldwide for CEN national Members.
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SIST EN 13384-2:2003
EN 13384-2:2003 (E)
Contents
page
Foreword .4
1 Scope .5
2 Normative references.5
3 Terms and definitions .6
3.1 chimney segment .6
3.2 collector segment.6
3.3 air-flue gas system .6
3.4 flue gas mass flow ( m) .6
3.4.1 declared flue gas mass flow ( m).6
W, j
3.4.2 calculated flue gas mass flow ( m) .6
Wc,j
3.5 calculated flue gas temperature (T ).6
Wc, j
3.6 calculated draught of the flue gas of the heating appliance (P ) .6
Wc,j
3.7 flue damper .6
3.8 balanced flue chimney .7
3.9 cascade arrangement.7
3.10 uulti inlet arrangement.7
3.11 air duct.7
3.12 pressure equalising opening.7
4 Symbols, terminology, units .7
5 Calculation method .9
5.1 General principles .9
5.2 Pressure equilibrium condition.10
5.3 Mass flow requirement.12
5.4 Pressure requirement.12
5.5 Temperature requirement .12
5.6 Calculation procedure.13
6 Flue gas data characterising the heating appliance.14
7 Data for chimney and connecting flue pipes.16
8 Basic data for the calculation.16
8.1 Air temperatures.16
8.1.1 External air temperature (T ).16
L
8.1.2 Ambient air temperature (T ) .16
u
8.2 External air pressure (p ) .16
L
8.3 Gas constant .16
8.3.1 Gas constant of the air (R ).16
L
8.3.2 Gas constant of flue gas (R) .16
8.4 Density of air () .16
L
8.5 Specific heat capacity of the flue gas (c ) .16
p
8.6 Water vapour content ((H O) ) and condensing temperature (T ) .16
2 ,j sp
8.7 Correction factor for temperature instability (S ).17
H
8.8 Flow safety coefficient (S ) .17
E
8.9 External coefficient of heat transfer .17
9 Determination of temperatures .17
10 Mixing calculations.19
( m)
10.1 Flue gas mass flow .19
, j
10.2 Flue gas temperature at the inlet of the chimney segment (T ).19
e,j
10.3 CO -content of the flue gas in the chimney segment ((CO ) ) .19
2 ,j
2
2
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SIST EN 13384-2:2003
EN 13384-2:2003 (E)
10.4 H O-content of the flue gas ((H O) ) .19
2 2 ,j
10.5 Gas constant of the flue gas (R ) .20
,j
10.6 Flue gas data.20
10.6.1 Specific heat capacity (c ), (c ) .20
pV,j p,j
10.6.2 Thermal conductivity of the flue gas (), () .20
AV,j A,j
10.6.3 Dynamic viscosity (), () .21
AV,j A,j
11 Density and velocity of the flue gas .21
12 Draught at the outlet of the connecting flue pipe and draught at the inlet of the chimney
segment .22
12.1 Draught at the inlet of the chimney segment.22
12.1.1 Draught due to chimney effect in the chimney segment (P ) .23
H,j
(P )
12.1.2 Pressure resistance in the chimney segment .23
R,j
12.2 Draught required at the outlet of the connecting flue pipe (P ) .25
Ze,j
12.2.1 Calculated pressure resistance of the connecting flue pipe (P ).26
V,j
12.2.2 Pressure resistance of the air supply (P ) .28
B,j
13 Inner wall temperature .29
14 Cascade installations.30
14.1 Principle of the calculation method.30
14.2 Pressure equilibrium condition.30
14.3 Mass flow requirement.32
14.4 Pressure requirement.32
14.5 Temperature requirement .32
14.6 Calculation procedure.32
14.7 Draught at the outlet of the connecting flue pipe and draught at the inlet of the collector
segment .33
14.7.1 Draught at the flue gas inlet into the collector segment (P ).33
ZC,j,l
14.7.2 Draught at the outlet of the connecting flue pipe (P ).35
ZeC,j,l
14.8 Inner wall temperature (T ) .37
iobC,j,l
15 Balanced flue chimney.37
15.1 Principle of the calculation method.37
15.2 Pressure equilibrium condition.37
15.3 Mass flow requirement.38
15.4 Pressure requirements.38
15.5 Temperature requirements .40
15.6 Calculation procedure for balanced flue chimneys .40
15.7 Mass flow of the supply air.41
15.8 Determination of the temperatures in balanced flue chimneys.42
15.8.1 Separate ducts .42
15.8.2 Concentric ducts .42
15.8.3 Concentric connection pipes .49
15.9 Pressure resistance of the air supply.55
15.9.1 Draught due to chimney effect at the outlet of the supply air duct.55
15.9.2 Draught due to chimney effect at the outlet of the air supply duct of connection pipes .55
15.9.3 Pressure resistance of the air supply duct of the chimney segment j (P ) .56
RB,j
15.10 Density and velocity of the supply air.59
15.10.1 Density and velocity of the supply air in the air supply duct averaged over the length of
the chimney segment.59
15.10.2 Density and velocity of the supply air averaged over the length of the connection pipes .60
Annex A (informative) Recommendations.61
A.1 Recommendations for the chimney and heating appliances:.61
A.2 Recommendations for connecting flue pipes:.61
Annex B (informative) Characteristics for the heating appliance .62
3
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SIST EN 13384-2:2003
EN 13384-2:2003 (E)
Foreword
This document EN 13384-2:2003 has been prepared by Technical Committee CEN /TC 166, "Chimneys",
the secretariat of which is held by UNI.
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 November 2003, and conflicting national standards shall be
withdrawn at the latest by November 2003.
This draft is one of a series of standards prepared by CEN/TC 166 comprising product standards and
execution standards for chimneys.
Annexes A and B are 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.
4
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SIST EN 13384-2:2003
EN 13384-2:2003 (E)
Introduction
The calculation described in this standard is complex and is intended to be solved by using a computer
programme. The general principles of this calculation method of EN 13384-1 also apply to this standard.
This standard is in support of the execution standards for a chimney installation serving more than one
heating appliance.
The execution standard identifies limitations and safety considerations associated with the design,
installation, commissioning and maintenance of a chimney serving more than one heating appliance (not
dealt within the calculation method).
1 Scope
This part of EN 13384 specifies methods for calculation of the thermal and fluid dynamic characteristics of
chimneys serving more than one heating appliance.
This part of EN 13384 covers both the cases, either
(1) where the chimney is connected with more than one connecting flue pipe from individual or several
appliances in a multi-inlet arrangement or
(2) where the chimney is connected with an individual connecting flue pipe connecting more than one
appliance in a cascade arrangement.
The case of multiple inlet cascade arrangement is covered by the case (1).
This part of EN 13384 deals with chimneys operating under negative pressure conditions (there can be
positive pressure condition in the connecting flue pipe) and is valid for chimneys serving heating appliances
for liquid, gaseous and solid fuels.
This part of EN 13384 does not apply to:
chimneys with different thermal resistance or different cross-section in the various chimney segments.
This part does not apply to calculate energy gain.
chimneys with open fire places, e.g. open fire chimneys or chimney inlets which are normally intended to
operate open to the room
chimneys which serve a mixture of fan assisted or forced draught burners or natural draught appliances.
Fan assisted appliances with draught diverter between the fan and the chimney are considered as
natural draught appliances.
chimneys with multiple inlets from more than 5 storeys. (This does not apply to balanced flue chimney.)
chimneys serving heating appliances with open air supply through ventilation openings or air ducts,
which are not installed in the same air supply pressure region (e.g. same side of building).
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 1443 Chimneys - General requirements.
prEN 12391-1 Chimneys - Metal chimneys – Part 1:Execution standard.
5
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SIST EN 13384-2:2003
EN 13384-2:2003 (E)
EN 13384-1:2002 Chimneys - Thermal and fluid dynamic calculation methods - Part 1: Chimneys serving
one appliance.
3 Terms and definitions
For the purposes of this European Standard, the terms and definitions given in EN 1443, EN 13384-1:2002
and prEN 12391-1 and the following apply.
3.1
chimney segment
part of a chimney between two consecutive flue gas connections or between the last flue gas connection
and the chimney outlet
3.2
collector segment
part of a connecting flue pipe between two consecutive flue gas connections or between the last flue gas
connection and the chimney inlet
3.3
air-flue gas system
system of concentric or non concentric ducts or parallel ducts for transport of combustion air from the open
air to the heating appliances and products of combustion from the heating appliances to the open air
3.4
flue gas mass flow ( m)
mass of the flue gas leaving the heating appliance through the connecting flue pipe per unit of time. In case
of a chimney serving more than one heating appliance, the air being transported through an appliance which
is out of action is also given the term flue gas mass flow.
3.4.1
declared flue gas mass flow ( m )
W, j
flue gas mass flow given by the manufacturer of the heating appliance j with respect to the heat output used
in the calculation
3.4.2
calculated flue gas mass flow ( m)
Wc,j
flue gas mass flow calculated with respect to calculated draught and the working conditions of the heating
appliance j
3.5
calculated flue gas temperature (T )
Wc, j
flue gas temperature at the outlet of the heating appliance j depending on the calculated flue gas mass flow
3.6
calculated draught of the flue gas of the heating appliance (P )
Wc,j
draught at the flue gas outlet of the heating appliance j depending on the calculated flue gas mass flow
3.7
flue damper
device to close or partially close the flue
6
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SIST EN 13384-2:2003
EN 13384-2:2003 (E)
3.8
balanced flue chimney
chimney where the point of air entry to the combustion air duct is adjacent to the point of discharge of
combustion products from the flue, the inlet and outlet being so positioned that wind effects are substantially
balanced
3.9
cascade arrangement
arrangement where two or more appliances situated in the same space are connected by a common
connecting flue pipe to the chimney
3.10
uulti inlet arrangement
arrangement where two or more appliances situated in different spaces are connected to the chimney by
individual connecting flue pipes
3.11
air duct
independent duct in a building or a structural part of a flue terminal conveying combustion air to a room-
sealed appliance
3.12
pressure equalising opening
opening or duct that directly connects the air duct with the flue at its base
4 Symbols, terminology, units
Symbols, terminology and units are given to make the text of this standard understandable, although a part
of them is already listed in part 1 of this standard series. Indices added to symbols for purposes of the
calculation method for chimneys serving more than one heating appliance relate to one chimney segment
and/or connection flue pipe section. An example of an indices numbering scheme is given in Figures 1 and
2. Indices numbering shall begin at the lowest, farthest appliance connection. For more than one cascade
system/connection, the indices numbering scheme for the calculation formula should be adopted in a similar
manner to that for a single cascade scheme. Symbols assigned to a specific section will be indicated by the
number of the section after the comma (e. g. H is the effective height of a section of a chimney segment
,1
between the outlet of the connecting flue pipe of the heating appliance in the lowest position and the outlet
of the connecting flue pipe of the next heating appliance).
Table 1 - Symbols, terminology, units
Symbols Terminology Units
2
A cross sectional area of the chimney m
c specific heat capacity of flue gas J/(kg·K)
p
D diameter m
hydraulic diameter m
D
h
2
g acceleration due to gravity = 9,81
m/s
H
effective height of the chimney segment j m
,j
H effective height of the connecting flue pipe j m
V,j
K, coefficient of cooling of the chimney segment j -
j
2
k coefficient of heat transmission of the chimney segment j
W/(m ·K)
j
7
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SIST EN 13384-2:2003
EN 13384-2:2003 (E)
2
k coefficient of heat transmission at upper end of the chimney segment j
W/(m ·K)
ob,j
coefficient of cooling of the connecting flue pipe j -
K
V,j
L length of the chimney segment j m
,j
mflue gas mass flow in the chimney segment j kg/s
, j
mflue gas mass flow in the connecting flue pipe j kg/s
V, j
mdeclared flue gas mass flow of the heating appliance j kg/s
W, j
mcalculated flue gas mass flow of the heating appliance j kg/s
Wc, j
N number of heating appliances serving the chimney -
Nu Nusselt number -
Q
minimum heat output of the heating appliance j kW
min,j
nominal heat output of the heating appliance j kW
Q
N,j
P pressure resistance of the air supply j of the heating appliance j Pa
B,j
P
calculated pressure resistance of the air supply of the heating appliance j Pa
Bc,j
P theoretical draught available due to chimney effect in chimney segment j Pa
H,j
wind velocity pressure Pa
P
L
p external air pressure Pa
L
P pressure resistance of the chimney segment j Pa
R,j
Pr Prandtl number -
P minimum draught for the heating appliance j Pa
W,j
calculated draught of the heating appliance j Pa
P
Wc,j
draught at the flue gas inlet into the chimney segment j Pa
P
Z,j
calculated pressure resistance of the connecting flue pipe j Pa
P
V,j
R gas constant of the flue gas J/(kg·K)
r mean value of roughness value of the inner wall m
Re
Reynolds number -
gas constant of the air J/(kg·K)
R
L
flow safety coefficient -
S
E
correction factor of temperature instability -
S
H
flue gas temperature at the inlet of the chimney segment j K
T
e,j
temperature limit of the chimney segment j K
T
g,j
T inner wall temperature at the outlet of chimney segment j at temperature K
iob,j
equilibrium
external air temperature K
T
L
mean temperature of the flue gas in the chimney segment j K
T
m,j
flue gas temperature at the outlet of the chimney segment j K
T
o,j
ambient air temperature of the chimney segment j K
T
u,j
declared flue gas temperature of the heating appliance j K
T
W,j
calculated flue gas temperature of the heating appliance j K
T
Wc,j
U internal circumference of the chimney m
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SIST EN 13384-2:2003
EN 13384-2:2003 (E)
w mean velocity over the length and over the cross section of the chimney m/s
m,j
segment j
2
internal coefficient of heat transfer of the flueW/(m ·K)
i
angle between flow directions e. g. between connecting flue pipe and the deg
chimney segment
2
dynamic viscosity of flue gasN·s/m
A
2
1 thermal resistance m ·K/W
coefficient of thermal conductivity of flue gas W/(m·K)A
3
density of flue gas averaged over the length and over the cross sectionkg/m
m,j
of the chimney segment j
coefficient of flow resistance due to friction of the flue -
coefficient of flow resistance due to a directional and/or cross sectional -
and/or mass flow change in the flue
5 Calculation method
5.1 General principles
The calculation is based upon determining the mass flow distribution in the chimney which fulfils the
pressure equilibrium condition (formula 1) at each flue gas inlet to the chimney (see Figure 1). After such a
distribution has been found three requirements shall be verified:
(1) the mass flow requirement (formulae 4 and 5)
(2) the pressure requirement (formula 6)
(3) the temperature requirement (formula 7)
NOTE The calculation is affected by the specific installation design. For recommendations for the installation of
appliance and connection flue pipes see annex A.
The validation of the mass flow requirement and pressure requirement shall be done at following working
conditions, using the external and ambient air temperatures specified in EN 13384-1.
All heating appliances are simultaneously operating at nominal heat output.
All heating appliances are simultaneously operating at minimum heat output
A single heating appliance operating at nominal heat output and all other appliances out of action (all
possible cases)
A single heating appliance operating at minimum heat output and all other appliances out of action (all
possible cases)
If the control of the installation guarantees that not all appliances will be in operation simultaneously, the
validation of the mass flow requirement and pressure requirement may be done with the maximum number
of appliances which will be in operation under the most adverse condition.
The validation for the mass flow requirement and pressure requirement for working conditions with heating
appliances at minimum heat output is not required in the following cases:
the heating appliances do not have any heat output range
the heating appliances have a heat output which is limited to a fixed value as specified on a label on the
appliance. In this case the nominal heat output is the given heat output on the label.
heating appliances heated with s
...
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