EN 13384-1:2002

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Chimneys - Thermal and fluid dynamic calculation methods - Part 1 : Chimneys serving one applianceConduits de fumée - Méthodes de calcul thermo-aéraulique - Partie 1 : Conduits de fumée ne desservant qu'un seul appareilAbgasanlagen - Wärme- und strömungstechnische Berechnungsverfahren - Teil 1 : Abgasanlagen mit einer Feuerstätte91.060.40Dimniki, jaški, kanaliChimneys, shafts, ductsICS:SIST EN 13384-1:2003enTa slovenski standard je istoveten z:EN 13384-1:200201-april-2003SIST EN 13384-1:2003SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 13384-1December 2002ICS 91.060.40English versionChimneys - Thermal and fluid dynamic calculation methods -Part 1 : Chimneys serving one applianceConduits de fumée - Méthodes de calcul thermo-aéraulique- Partie 1 : Conduits de fumée ne desservant qu'un seulappareilAbgasanlagen - Wärme- und strömungstechnischeBerechnungsverfahren - Teil 1 : Abgasanlagen mit einerFeuerstätteThis European Standard was approved by CEN on 23 October 2002.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards 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 translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2002 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 13384-1:2002 E

Calculation of thermal resistance.39Annex B (informative)
Tables.40Annex C (informative)
Chimney outlet with regard to adjacent buildings.56Annex D (informative)
Limit curves of the classification for the draught regulator.57Bibliography.58

m2c specific heat capacity
J/(kg·K)cpspecific heat capacity of flue gasJ/(kg·K)dthickness of the section
mDdiameter
mDhhydraulic diameter
mHeffective height of the chimney
mkcoefficient for heat transmission
W/(m2.K)Kcoefficient of cooling--Llength
mmflue gas mass flow
kg/sNuNusselt number
--pstatic pressure
PapLexternal air pressure
PaPBpressure resistance of the air supply for a flue gas mass flowPaPEpressure resistance due to friction and form resistance
of the chimney PaPFVeffective pressure resistance of the connecting flue pipePaPGdifference in pressure caused by change ofvelocity of flue gas in the chimney PaPHtheoretical draught available due to chimney effectPaPHVtheoretical draught available due to chimney effect ofthe connecting flue pipePaPLwind velocity pressurePaPNLdraught required for secondary air devicesPaPRpressure resistance of the chimney
PaPRVpressure resistance of the connecting flue pipePaPWminimum draught for the heating appliance
PaPWOmaximum differential pressure of the heating appliancePaPZdraught at the flue gas inlet into the chimneyPaPZedraught required at the flue gas inlet into the chimneyPaPZOpositive pressure at the flue gas inlet into the chimney PaTable 1 (continued)SymbolTerminologyUnit-----------------------------------------------------------------------------------------------------------------------------------PZOemaximum differential pressure at the flue gas inlet into the chimneyPaPrPrandtl number
--Qheat output
kWQFheat input
kW
kWrmean value of roughness of the inner wallmRgas constant of the flue gasJ/(kg·K)RLgas constant of the airJ/(kg·K)ReReynolds number
--scross section
mSEflow safety coefficient
--SHcorrection factor for temperature instability--ttemperature
°CTtemperature, absolute
KTgtemperature limitKTioinner wall temperature at chimney outletKTiobinner wall temperature at the chimney outlet at temperatureequilibriumKTLexternal air temperatureKTmmean temperature of the flue gasKTpwater dew pointKTspcondensing temperatureKTuambient air temperatureKTubambient air temperature of the boiler roomKTuhambient air temperature for heated areasKTuoambient air temperature at the chimney outletKTulambient air temperature for areas external to the buildingKTuuambient air temperature for unheated areas inside the houseKTWflue gas temperature of the applianceKTWNflue gas temperature of the appliance at nominal heat outputKTWminflue gas temperature of the appliance at the lowest possible heat output
KU internal chimney segment parametermwmean velocity within a cross sectionm/swmmean velocity over a defined lengthm/syform value
--zheight above sea levelmacoefficient of heat transferW/(m2·K)bratio of the combustion air mass flow to theflue gas mass flow
--gangle between flow directions
°dwall thicknessm
N×s/m2hWefficiency of the heating appliance
--hWNefficiency of the heating appliance at nominal heat output--lcoefficient of thermal conductivity
W/(m·K)rdensity kg/m3rLdensity of the external airrmmean density of flue gas averaged over a defined length and over the crosskg/m3sections (CO2)volume-concentration of CO2
%s (H2O)volume-concentration of H2O (vapour)
%ycoefficient of flow resistance due to friction of the flue--1Læèçöø÷thermal resistance
m2·K/WTable 2 - Additional subscriptsSubscriptTerminology
Unit----------------------------------------------------------------------------------------------------------------------------------aoutside
--Aflue gas
--bequilibrium temperature condition
--Bcombustion air
--eentrance
--Gchange in velocity
--iinside
--Lopen air (outside)
--mmean value
--Mmixture
--ncounting index
--Nnominal value--NLsecondary air
--ochimney outlet
--Opositive pressure
--tottotalized over all sections (segments)--uambient air
--Vconnecting flue pipe--Wheating appliance
--_____________________________________________________________________________

three criteria:- the draught at the flue gas inlet into the chimney shall be equal to or greater than the draught requiredat the flue gas inlet into the chimney;- the draught at the flue gas inlet to the chimney shall be equal to or greater than the effective pressureresistance of the air supply;- the temperature of the inner wall at the chimney outlet of the chimney shall be equal to or greater thanthe temperature limit.The calculation of inside dimensions (cross section) of positive pressure is based on the following threecriteria:– the comparison between the positive pressure at the flue gas inlet into the chimney shall be equal orless than the maximum differential pressure at the flue gas inlet into the chimney;– the positive pressure in the connecting flue pipe and in the chimney shall not be higher than theexcess pressure for which both are designated;– the temperature of the inner wall at the chimney outlet of the chimney shall be equal to greater thanthe temperature limit.In order to verify the criteria two sets of external conditions are used:– the calculation of the pressure (draught) is made with conditions for which the capacity of the chimneyis minimal (i.e. high outside temperature); and also– the calculation of inner wall temperature with conditions for which the inside temperature of thechimney is minimal (i.e. low outside temperature).5.2 Pressure requirements5.2.1 Negative pressure chimneysThe following relationships shall be verified:PZ = PH - PR - PL ³ PW
+ PFV + PB
= PZein Pa (1)PZ ³ PBin Pa(2)WherePBis the effective pressure resistance of air supply (see 5.11.3), in Pa;PFVis the effective pressure resistance of the connecting flue pipe, in Pa;PH is the theoretical draught available due to chimney effect, in Pa;PLis the wind velocity pressure, in Pa;PRis the pressure resistance of the chimney, in Pa;

In5.7 the formulae provide the calculation of the basic data which are needed for further calculation.In 5.5.2 and 5.8 the formulae for the calculations of the relevant temperatures are compiled. The formulaefor the density of the flue gas and its velocity are compiled in 5.9.The procedure in 5.10 and 5.11 shall be used to validate the pressure requirement. The procedure in 5.12shall be used to validate the temperature requirement.The validation for pressure and temperature requirement shall be conducted twice:-for the nominal heat output of the heating appliance;- for the lowest value of the heat output range which is indicated by the manufacturer of the heatingappliance.If the temperature requirements in equations (6) and (7) of negative pressure chimneys are not fulfilledthe validation of the temperature condition can occasionally be done by taking additional secondary air tothe flue gas into account according to clause 6.5.5 Flue gas data characterising the heating appliance for nominal heat output5.5.1 GeneralFor the calculation of temperatures and pressure values the relevant flue gas data which characterisesthe heating appliance, consisting of flue gas mass flow, flue gas temperature and the minimum draughtrequired for the heating appliance or the maximum differential pressure of the heating appliance shall beobtained. Additionally the kind of the fuel supplied, the volume concentration of CO2 of the flue gas andthe geometry of the connecting flue pipe shall be specified.Typical data for some fuels are given in Table B.1.Typical data for some heating appliances are given in Tables B.2 and B.3.5.5.2 Flue gas mass flow5.5.2.1 Flue gas mass flow at nominal heat output of the heating applianceFor the calculation of pressure and temperature values according to relationships of equations (1), (2) (3),(4), (5) and (6) the flue gas mass flow at nominal heat output conditions for the heating appliance shall beobtained.

fmf
= 0,139 kg/(s.m2).For open fire places with an opening height greater than its width
fmf
= 0,167 kg/(s.m2).The CO2- content of the flue gas for open fire places may be taken as (CO2) = 1 %.5.5.2.2 Flue gas mass flow at the lowest permissible heat outputIf the heating appliance is designed to operate under modulating conditions an additional check shall beconducted for the pressure and temperature requirement of the flue gas mass flow at the lowest possibleand permissible heat output of the heating appliance.If the manufacturer does not provide flue gas data for the lowest heat output use
a mass flow of one thirdof the flue gas mass flow at nominal heat output.5.5.2.3 Flue gas mass flow with secondary airIf secondary air is supplied by a draught regulator or draught diverter the air flow shall be calculatedaccording to 6.3 depending on the actual difference of the pressure in the room of installation of theheating appliance and the chimney or connecting flue pipe.5.5.3 Flue gas temperature5.5.3.1 Flue gas temperature at nominal heat output (TWN)The flue gas temperature at nominal heat output TWN shall be obtained from the heating appliancemanufacturer. In the case of heating appliances with a draught diverter, the flue gas temperaturedownstream of the draught diverter shall be used.If the manufacturer provides data showing flue gas temperature downstream of the draught diverter inrelation to draught, such data shall be used for the calculation.If the flue gas temperature TWN of open fire places is not known a value of tWN = 80 °C (TWN = 353,15 K)should be used.

using the following formula:
...