Chimneys - Thermal and fluid dynamic calculation methods - Part 2: Chimneys serving more than one heating appliance

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
a)   where the chimney is connected with more than one connecting flue pipe from individual or several appliances in a multi-inlet arrangement; or
b)   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 a).
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 with chimneys operating under positive pressure conditions 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 different kinds of heating appliances regarding natural draught, fan assisted, forced draught or combustion engine. 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).
For positive pressure chimneys this part only applies if any heating appliance which is out of action can be positively isolated to prevent flue gas back flow.

Abgasanlagen - Wärme- und strömungstechnische Berechnungsverfahren - Teil 2: Abgasanlagen mit mehreren Feuerstätten

Dieser Teil der Normenreihe EN 13384 legt Berechnungsverfahren für die wärme- und strömungstechnischen Eigenschaften von Abgasanlagen mit mehreren Feuerstätten fest.
Dieser Teil der EN 13384 umfasst zwei Fälle:
a)   senkrechte Teile von Abgasanlagen, in die mehrere Verbindungsstücke von einzelnen oder mehreren zusammengefassten Feuerstätten münden; oder
b)   senkrechte Teile von Abgasanlagen, in die ein einzelnes Verbindungsstück mündet, das mehrere Feuerstätten in Kaskadenschaltung verbindet.
Der Fall des Anschlusses mehrerer Kaskadenschaltungen ist durch Fall a) abgedeckt.
Dieser Teil von EN 13384 befasst sich mit Unterdruckabgasanlagen (im Verbindungsstück können Überdruckbedingungen herrschen) sowie mit Überdruckabgasanlagen und gilt für Abgasanlagen mit Feuerstätten für flüssige, gasförmige und feste Brennstoffe.
Dieser Teil der Normenreihe EN 13384 gilt nicht für:
-   Abgasanlagen mit unterschiedlichen Wärmedurchlasswiderständen oder unterschiedlichen Querschnitten in den verschiedenen Abschnitten der Abgasanlage. Energiegewinne werden durch diesen Teil der Normenreihe nicht berücksichtigt;
-   Abgasanlagen für offene Feuerstätten, z. B. offene Kamine oder Abgaseinführungen in die Abgasanlage, die bestimmungsgemäß offen im Raum betrieben werden;
-   Abgasanlagen für verschiedene Feuerstätten mit Unterdruckbetrieb (Naturzug), Gebläseunterstützung oder Verbrennungskraftmaschine. Gebläseunterstützte Abgasanlagen mit einer Nebenluftvorrichtung zwischen Gebläse und Abgasanlage sind als Naturzugkessel anzusehen;
-   Abgasanlagen mit Mehrfachanschlüssen aus mehr als 5 Geschossen (dies gilt nicht für Luft-Abgas-Systeme);
-   Abgasanlagen für Feuerstätten, denen die Zuluft über Öffnungen ins Freie oder Zuluftleitungen zugeführt wird, die sich druckmäßig nicht im gleichen Luftverbund befinden (z. B. auf der gleichen Seite des Gebäudes).
Bei Überdruckabgasanlagen gilt dieser Teil nur dann, wenn alle nicht in Betrieb befindlichen Feuerstätten sicher abgesperrt werden können, um einen Abgasrückfluss zu verhindern.

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 thermoaérauliques de conduits de fumée desservant plusieurs générateurs de chaleur.
Cette partie de la norme EN 13384 traite des deux cas suivants :
a)   cas où le conduit d’évacuation est relié à plusieurs conduits de raccordement partant d'un ou de plusieurs générateurs de chaleur dans un système multi-entrée ou
b)   cas où le conduit d’évacuation est relié à un seul conduit de raccordement reliant plusieurs générateurs de chaleur dans un système en cascade.
Le cas du système multi-entrée en cascade est couvert par le cas a).
La présente partie de l'EN 13384 traite des conduits de fumée fonctionnant dans des conditions de pression négative (il peut y avoir une pression positive dans le conduit de raccordement) et des conduits de fumée fonctionnant dans des conditions de pression positive ; 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. 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 différentes sortes de générateurs de chaleur : appareils à tirage naturel, ventilés, à tirage forcé ou à moteur à combustion. Les appareils ventilés possédant un coupe-tirage entre le ventilateur et le conduit d’évacuation sont considérés comme des appareils à tirage naturel ;
   conduits multi-entrées desservant plus de 5 étages. (Ceci ne s'applique pas aux conduits d’évacuation des produits de combustion et d’amenée d’air comburant) ;
   conduits desservant des générateurs de chaleur alimentés à l'air libre par l'intermédiaire d'ouvertures de ventilation ou de conduits aérauliques, qui ne sont pas installés dans la même zone de pression d'alimentation en air (par exemple du même côté du bâtiment) ;
Pour les conduits de fumée sous pression positive, cette partie ne s’applique

Dimniki - Računske metode termodinamike in dinamike fluidov - 2. del: Dimniki za več kot eno ogrevalno napravo

General Information

Status
Withdrawn
Publication Date
30-Jul-2015
Withdrawal Date
02-Jul-2019
Current Stage
9960 - Withdrawal effective - Withdrawal
Completion Date
03-Jul-2019

Relations

Buy Standard

Standard
EN 13384-2:2015 - natisnjeno za čitalnico
English language
74 pages
sale 10% off
Preview
sale 10% off
Preview
e-Library read for
1 day

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 13384-2:2015
01-junij-2015
1DGRPHãþD
SIST EN 13384-2:2003+A1:2009
'LPQLNL5DþXQVNHPHWRGHWHUPRGLQDPLNHLQGLQDPLNHIOXLGRYGHO'LPQLNL]D
YHþNRWHQRRJUHYDOQRQDSUDYR

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

Conduit de cheminée - Méthode de calcul thermo-aéraulique - Partie 2: Conduits de

fumée desservant plus d'un appareil de chauffage
Ta slovenski standard je istoveten z: EN 13384-2:2015
ICS:
91.060.40 Dimniki, jaški, kanali Chimneys, shafts, ducts
SIST EN 13384-2:2015 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN 13384-2:2015
---------------------- Page: 2 ----------------------
SIST EN 13384-2:2015
EUROPEAN STANDARD
EN 13384-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2015
ICS 91.060.40 Supersedes EN 13384-2:2003+A1:2009
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 mehreren

de chauffage Feuerstätten
This European Standard was approved by CEN on 24 January 2015.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European

Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national

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

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same

status as the official versions.

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

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

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

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

© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13384-2:2015 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 13384-2:2015
EN 13384-2:2015 (E)
Contents Page

Foreword ..............................................................................................................................................................5

Introduction .........................................................................................................................................................6

1 Scope ......................................................................................................................................................7

2 Normative references ............................................................................................................................7

3 Terms and definitions ...........................................................................................................................8

4 General symbols and abbreviations ....................................................................................................9

5 Calculation method................................................................................................................................9

5.1 General principles..................................................................................................................................9

5.2 Pressure equilibrium condition ......................................................................................................... 11

5.2.1 Negative pressure chimneys ............................................................................................................. 11

5.2.2 Positive pressure chimneys .............................................................................................................. 12

5.3 Mass flow requirement ....................................................................................................................... 13

5.4 Pressure requirements ....................................................................................................................... 13

5.4.1 Negative pressure chimneys ............................................................................................................. 13

5.4.2 Positive pressure chimneys .............................................................................................................. 14

5.5 Temperature requirement .................................................................................................................. 15

5.6 Calculation procedure ........................................................................................................................ 15

6 Flue gas data characterising the heating appliance ....................................................................... 18

7 Data for chimney and connecting flue pipes ................................................................................... 19

8 Basic data for the calculation ............................................................................................................ 20

8.1 General ................................................................................................................................................. 20

8.2 Air temperatures ................................................................................................................................. 20

8.2.1 External air temperature (T ) ............................................................................................................. 20

8.2.2 Ambient air temperature (T ) ............................................................................................................. 20

8.3 External air pressure (p ) ................................................................................................................... 20

8.4 Gas constant ....................................................................................................................................... 20

8.4.1 Gas constant of the air (R ) ................................................................................................................ 20

8.4.2 Gas constant of flue gas (R) .............................................................................................................. 20

8.5 Density of air (ρ ) ................................................................................................................................ 20

8.6 Specific heat capacity of the flue gas (c ) ........................................................................................ 20

8.7 Water vapour content (σ(H O) ) and condensing temperature (T ) ............................................. 20

2 ,j sp

8.8 Correction factor for temperature instability (S ) ............................................................................ 21

8.9 Flow safety coefficient (S ) ................................................................................................................ 21

8.10 External coefficient of heat transfer ................................................................................................. 21

9 Determination of temperatures ......................................................................................................... 21

10 Mixing calculations ............................................................................................................................. 23

10.1 General ................................................................................................................................................. 23

10.2 Flue gas mass flow ( m ) .................................................................................................................... 23

10.3 Flue gas temperature at the inlet of the chimney segment (T ) .................................................... 23

e,j

10.4 CO -content of the flue gas in the chimney segment (σ(CO ) ) ..................................................... 23

2 2 ,j

10.5 H O-content of the flue gas (σ(H O) ) ................................................................................................ 24

2 2 ,j

10.6 Gas constant of the flue gas (R ) ...................................................................................................... 24

10.7 Flue gas data ....................................................................................................................................... 24

10.7.1 Specific heat capacity (c ), (c ) ...................................................................................................... 24

pV,j p,j
---------------------- Page: 4 ----------------------
SIST EN 13384-2:2015
EN 13384-2:2015 (E)

10.7.2 Thermal conductivity of the flue gas (λ ), (λ ) .............................................................................. 24

AV,j A,j

10.7.3 Dynamic viscosity (η ), (η ) ............................................................................................................ 25

AV,j A,j

10.7.4 Condensing temperature (T ) ........................................................................................................... 25

11 Density and velocity of the flue gas .................................................................................................. 25

12 Determination of the pressures ......................................................................................................... 26

12.1 Pressures at each inlet of the chimney segments ........................................................................... 26

12.1.1 Draught ................................................................................................................................................. 26

12.1.2 Positive pressure ................................................................................................................................. 26

12.1.3 Draught due to chimney effect in the chimney segment (P ) ........................................................ 27

H,j

12.1.4 Pressure resistance in the chimney segment (P ) ......................................................................... 27

R,j

12.2 Minimum draught required at the flue gas inlet into the chimney and maximum allowed

and P ) and maximum and minimum differential pressure at the flue gas
draught (P
Ze Zemax

and P ) ............................................................................................ 29

inlet into the chimney (P
ZOe ZOemin

12.2.1 Minimum required and maximum allowed draught ......................................................................... 29

12.2.2 Maximum available and minimum allowed differential pressure ................................................... 29

12.2.3 Calculated pressure resistance of the connecting flue pipe (P ) .................................................. 30

V,j

12.2.4 Calculated pressure resistance of the air supply (P ) .................................................................. 32

Bc,j

13 Inner wall temperature ........................................................................................................................ 33

14 Cascade installations .......................................................................................................................... 33

14.1 Principle of the calculation method ................................................................................................... 33

14.2 Pressure equilibrium condition ......................................................................................................... 34

14.2.1 Negative pressure cascade installation ............................................................................................ 34

14.2.2 Positive pressure cascade installation ............................................................................................. 35

14.3 Mass flow requirement ........................................................................................................................ 36

14.4 Pressure requirements ....................................................................................................................... 36

14.4.1 Negative pressure chimneys .............................................................................................................. 36

14.4.2 Positive pressure chimneys ............................................................................................................... 37

14.5 Temperature requirement ................................................................................................................... 38

14.6 Calculation procedure ......................................................................................................................... 38

14.7 Pressures at the outlet of the connecting flue pipe and pressures at the inlet of the

collector segment ................................................................................................................................ 38

14.7.1 Pressure at the flue gas inlet into the collector segment (P or P )..................................... 38

ZC,j,l ZOC,j,l

14.7.2 Pressures required or available at the outlet of the connecting flue pipe (P , P ) .......... 42

ZeC,j,l ZOeC,j,l

14.8 Inner wall temperature (T ) ........................................................................................................... 44

iobC,j,l

15 Balanced flue chimney ........................................................................................................................ 44

15.1 Principle of the calculation method ................................................................................................... 44

15.2 Pressure equilibrium condition ......................................................................................................... 44

15.3 Mass flow requirement ........................................................................................................................ 45

15.4 Pressure requirements ....................................................................................................................... 45

15.4.1 Negative pressure chimneys .............................................................................................................. 45

15.4.2 Positive pressure chimneys ............................................................................................................... 45

15.5 Temperature requirements ................................................................................................................. 47

15.6 Calculation procedure for balanced flue chimneys ......................................................................... 47

15.7 Mass flow of the supply air ................................................................................................................ 49

15.8 Determination of the temperatures in balanced flue chimneys...................................................... 50

15.8.1 Separate ducts ..................................................................................................................................... 50

15.8.2 Concentric ducts ................................................................................................................................. 50

15.8.3 Concentric connection pipes ............................................................................................................. 58

15.9 Pressures of the air supply ducts ...................................................................................................... 64

15.9.1 Draught due to chimney effect of the air supply duct of chimney segment j ............................... 64

15.9.2 Draught due to chimney effect of the air supply duct of connection pipes .................................. 64

15.9.3 Pressure resistance of the air supply duct of the chimney segment j (P ) ................................ 64

RB,j

15.9.4 Pressure resistance of the air supply duct of the connection pipe j (P ) ................................. 66

RBV,j

15.10 Density and velocity of the supply air ............................................................................................... 68

---------------------- Page: 5 ----------------------
SIST EN 13384-2:2015
EN 13384-2:2015 (E)

15.10.1 Density and velocity of the supply air in the air supply duct averaged over the length of

the chimney segment ......................................................................................................................... 68

15.10.2 Density and velocity of the supply air averaged over the length of the connection pipes ........ 68

16 Consideration of chimney fans ......................................................................................................... 69

16.1 General ................................................................................................................................................. 69

16.2 Inline fans ............................................................................................................................................ 70

16.3 Exhaust fans ........................................................................................................................................ 71

Annex A (informative) Recommendations ..................................................................................................... 72

A.1 General ................................................................................................................................................. 72

A.2 Recommendations for the chimney and heating appliances ......................................................... 72

A.3 Recommendations for connecting flue pipes .................................................................................. 72

Annex B (informative) Characteristics for the heating appliance ............................................................... 73

---------------------- Page: 6 ----------------------
SIST EN 13384-2:2015
EN 13384-2:2015 (E)
Foreword

This document (EN 13384-2:2015) has been prepared by Technical Committee CEN/TC 166 “Chimneys”, the

secretariat of which is held by ASI.

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 October 2015, and conflicting national standards shall be withdrawn at

the latest by October 2015.

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

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

This document supersedes EN 13384-2:2003+A1:2009.

According to EN 13384-2:2003+A1:2009 the following fundamental changes are given:

— editorial mistakes have been corrected;
— mistakes in formulas have been corrected;

— characteristic values for heating appliances for solid fuel and for liquid fuels in Annex B have been

adapted to actual data;

— for the mixture of fuels a clarification about the rise of the dew point has been added;

— for non-concentric ducts the calculation of the mean temperature of the air supply has been amended;

— the process for iteration for appliances with low impact of the pressure to the flue gas mass flow (e.g.

CHP with combustion engine) has been simplified;
— for chimney fans a calculation procedure has been added;

This standard is one of a series of standards prepared by CEN/TC 166 comprising product standards and

execution standards for chimneys.
National installation rules are not regarded in the standard.

This document has been prepared under a mandate given to CEN by the European Commission and the

European Free Trade Association.

This European Standard “Chimneys — Thermal and fluid dynamic calculation methods” consists of three

Parts:
— Part 1: Chimneys serving one heating appliance
— Part 2: Chimneys serving more than one heating appliance

— Part 3: Methods for the development of diagrams and tables for chimneys serving one heating appliance

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following

countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech

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

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

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

---------------------- Page: 7 ----------------------
SIST EN 13384-2:2015
EN 13384-2:2015 (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).
---------------------- Page: 8 ----------------------
SIST EN 13384-2:2015
EN 13384-2:2015 (E)
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

a) where the chimney is connected with more than one connecting flue pipe from individual or several

appliances in a multi-inlet arrangement; or

b) 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 a).

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 with chimneys operating under positive pressure

conditions 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 different kinds of heating appliances regarding natural draught, fan assisted, forced

draught or combustion engine. 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).

For positive pressure chimneys this part only applies if any heating appliance which is out of action can be

positively isolated to prevent flue gas back flow.
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 1443:2003, Chimneys - General requirements

EN 13384-1:2015, Chimneys - Thermal and fluid dynamic calculation methods - Part 1: Chimneys serving one

appliance

EN 15287-1:2007+A1:2010, Chimneys - Design, installation and commissioning of chimneys - Part 1:

Chimneys for non-roomsealed heating appliances
---------------------- Page: 9 ----------------------
SIST EN 13384-2:2015
EN 13384-2:2015 (E)

EN 15287-2:2008, Chimneys - Design, installation and commissioning of chimneys - Part 2: Chimneys for

roomsealed appliances

prEN 16475-2, Chimneys - Accessories - Part 2: Chimney fans - Requirements and test methods

3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 1443:2003, EN 13384-1:2015,

EN 15287-1:2007+A1:2010, EN 15287-2:2008 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
flue gas mass flow

mass of the flue gas leaving the heating appliance through the connecting flue pipe per unit of time

Note 1 to entry: 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.
3.3.1
declared flue gas mass flow
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
3.3.2
calculated flue gas mass flow
Wc,j

flue gas mass flow calculated with respect to calculated draught and the working conditions of the heating

appliance j
3.4
calculated flue gas temperature
Wc,j

flue gas temperature at the outlet of the heating appliance j depending on the calculated flue gas mass flow

3.5
calculated draught of the flue gas of the heating appliance
Wc,j

draught at the flue gas outlet of the heating appliance j depending on the calculated flue gas mass flow

3.6
flue damper
device to close or partially close the flue
---------------------- Page: 10 ----------------------
SIST EN 13384-2:2015
EN 13384-2:2015 (E)
3.7
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
3.8
cascade arrangement

arrangement where two or more appliances situated in the same space are connected by a common

connecting flue pipe to the chimney
3.9
multi inlet arrangement

arrangement where two or more appliances are connected to the chimney by individual connecting flue pipes

3.10
air duct

independent duct in a building or a structural part of a flue terminal conveying combustion air to a room-sealed

appliance
3.11
pressure equalizing opening
opening or duct that directly connects the air duct with the flue at its base
4 General symbols and abbreviations

Symbols, terminology and units are given to make the text of this standard understandable. A list of general

symbols and abbreviations is given in EN 13384-1 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

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).
Each symbol and abbreviation is explained at the formula where it is used.
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 four requirements shall be verified:
a) the mass flow requirement (Formulas (4) and (5))

b) the pressure requirement for minimum draught or maximum positive pressure (Formulas (6) or (6b) and

(6c))

c) the pressure requirement for maximum draught or minimum positive pressure (Formulas (6a) or (6d))

---------------------- Page: 11 ----------------------
SIST EN 13384-2:2015
EN 13384-2:2015 (E)
d) the temperature requirement (Formula (7))

NOTE 1 The calculation is affected by the specific installation design. For recommendations for the installation of

...

Questions, Comments and Discussion

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