prEN 13348-1

SLOVENSKI STANDARD
01-julij-2025
Dimniki - Računske metode termodinamike in dinamike fluidov - 1. del: Dimniki za
eno kurilno napravo
Chimneys - Thermal and fluid dynamic calculation methods - Part 1: Chimneys serving
one combustion appliance
Abgasanlagen - Wärme- und strömungstechnische Berechnungsverfahren - Teil 1:
Abgasanlagen mit einer Verbrennungseinrichtung
Conduits de fumée - Méthodes de calcul thermoaéraulique - Partie 1: Conduits de fumée
ne desservant qu'un seul appareil à combustion
Ta slovenski standard je istoveten z: prEN 13348-1
ICS:
91.060.40 Dimniki, jaški, kanali Chimneys, shafts, ducts
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2025
ICS Will supersede EN 13384-1:2015+A1:2019
English Version
Chimneys - Thermal and fluid dynamic calculation
methods - Part 1: Chimneys serving one combustion
appliance
Conduits de fumée - Méthodes de calcul thermo- Abgasanlagen - Wärme- und strömungstechnische
aéraulique - Partie 1: Conduits de fumée ne desservant Berechnungsverfahren - Teil 1: Abgasanlagen mit einer
qu'un seul appareil à combustion Verbrennungseinrichtung
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 166.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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.

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Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 13348-1:2025 E
worldwide for CEN national Members.

prEN 13384-1:2025 (E)
Contents Page
European foreword . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Symbols and abbreviations .11
5 Calculation method for non-balanced flue chimneys .15
5.1 General principles .15
5.2 Pressure requirements .16
5.2.1 Negative pressure chimneys .16
5.2.2 Positive pressure chimneys .17
5.3 Temperature requirement .18
5.4 Calculation procedure .19
5.5 Flue gas data characterising the combustion appliance .19
5.5.1 General .19
5.5.2 Flue gas mass flow and combustion air mass flow .20
5.5.3 Flue gas temperature .21
5.5.4 Minimum draught for the combustion appliance (P ) for negative pressure
W
chimney .21
5.5.5 Maximum draught for the combustion appliance (P ) for negative pressure
Wmax
chimney .22
5.5.6 Maximum differential pressure of the combustion appliance (P ) for positive
WO
pressure chimney .22
5.5.7 Minimum differential pressure of the combustion appliance (P ) for positive
WOmin
pressure chimney .22
5.6 Characteristic data for the calculation .22
5.6.1 General .22
5.6.2 Mean value for roughness (r) .22
5.6.3 Thermal resistance (1/Λ) .22
5.7 Basic values for the calculation .23
5.7.1 Air temperatures .23
5.7.2 External air pressure (p ) .25
L
5.7.3 Gas constant .25
5.7.4 Density of the external air (ρ ).25
L
5.7.5 Specific heat capacity of the flue gas (c ) .26
p
5.7.6 Condensing temperature (T ) .26
sp
5.7.7 Correction factor for temperature instability (S ) .26
H
5.7.8 Flow safety coefficients (S and S ) .26
E EB
5.8 Determination of the temperatures .26
5.8.1 General .26
5.8.2 Calculation of the coefficient of cooling (K) .27
5.8.3 Coefficient of heat transmission (k ) .27
b
5.9 Determination of the density of the flue gas and the velocity of the flue gas .29
5.9.1 Density of the flue gas (ρ ) .29
m
5.9.2 Velocity of the flue gas (w ) .30
m
prEN 13384-1:2025 (E)
5.10 Determination of the pressures . 30
5.10.1 Pressure at the flue gas inlet into the chimney . 30
5.10.2 Theoretical draught available due to chimney effect (P ) . 31
H
5.10.3 Pressure resistance of the chimney (P ) . 31
R
5.10.4 Wind velocity pressure (P ) . 33
L
5.11 Minimum draught required at the flue gas inlet into the chimney and maximum
allowed draught (P and P ) and maximum and minimum differential pressure
Ze Zemax
at the flue gas inlet into the chimney (P and P ) . 33
ZOe ZOemin
5.11.1 General . 33
5.11.2 Minimum and maximum draught for the combustion appliance (P and P ) and
W Wmax
maximum and minimum differential pressure of the combustion appliance (P
WO
and P ) . 34
WOmin
5.11.3 Effective pressure resistance of the connecting flue pipe (P ) . 34
FV
5.11.4 Pressure resistance of the air supply (P ) . 36
B
5.12 Calculation of the inner surface temperature at the chimney outlet (T ) . 37
iob
6 Secondary air for negative pressure chimneys . 38
6.1 General . 38
6.2 Calculation method . 39
6.3 Basic values for the calculation of secondary air . 39
6.3.1 General . 39
6.3.2 Mixing calculations . 39
6.4 Pressures . 40
6.4.1 Pressure resistance for the air supply with secondary air (P ) . 40
BNL
6.4.2 Draught required for the secondary air devices (P ) . 42
NL
6.4.3 Pressure resistance for that part of the connecting flue pipe before the secondary
air device (P ) . 43
FV1
6.4.4 Pressure requirement with secondary air . 43
6.5 Temperature requirement with secondary air . 43
7 Calculation method for balanced flue chimneys . 43
7.1 General principles . 43
7.2 Pressure requirements . 44
7.3 Temperature requirements . 45
7.4 Calculation procedure . 45
7.5 Flue gas data characterizing the combustion appliance . 46
7.6 Characteristic data for the calculation . 46
7.7 Basic values for the calculation . 46
7.7.1 Air temperatures . 46
7.7.2 Other basic values . 47
7.8 Determination of the temperatures . 47
7.8.1 Non-concentric (separate) ducts. 47
7.8.2 Concentric ducts . 47
7.
...