oSIST prEN 15544:2006

SLOVENSKI oSIST prEN 15544:2006

PREDSTANDARD
september 2006
One off Kachelgrundöfen/Putzgrundöfen (tiled/mortared stoves) - Calculation
method
ICS 97.100.30 Referenčna številka
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

EUROPEAN STANDARD
DRAFT
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2006
ICS
English Version
One off Kachelgrundöfen/Putzgrundöfen (tiled/mortared stoves)
- Calculation method
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 295.
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 Management Centre has the same
status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,
Slovakia, Slovenia, Spain, Sweden, Switzerland 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
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2006 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 15544:2006: E
worldwide for CEN national Members.

Contents Page
Foreword.3
1 Scope .4
2 Normative references .4
3 Terms and definitions .4
4 Calculations.6
4.1 Nominal heat output .6
4.2 Load of fuel.6
4.2.1 Maximum load.6
4.2.2 Minimum load.6
4.3 Design of the essential dimensions.6
4.3.1 Combustion chamber dimensions.6
4.3.2 Minimum flue pipe length .8
4.3.3 Gas groove profile .8
4.4 Calculation of the burning rate.9
4.5 Fixing of the air ratio .9
4.6 Combustion air, flue gas.9
4.6.1 Combustion air flow rate.9
4.6.2 Flue gas flow rate.10
4.6.3 Flue gas mass flow rate .10
4.7 Calculations of the density .11
4.7.1 Combustion air density.11
4.7.2 Flue gas density.11
4.8 Calculation of the flue gas temperature .11
4.8.1 Mean combustion chamber temperature .11
4.8.2 Flue gas temperature in the flue pipe.12
4.8.3 Flue gas temperature in the connecting pipe .12
4.8.4 Flue gas temperature at chimney entrance, mean flue gas temperature of the chimney
and temperature of the chimney wall at the top of the chimney .12
4.9 Calculation of flow mechanics .12
4.9.1 Calculation of the standing pressure .12
4.9.2 Calculation of the flow velocity.13
4.9.3 Calculation of the static friction.13
4.9.4 Calculation of the resistance due to direction change.14
4.10 Operation control.16
4.10.1 Pressure condition .16
4.10.2 Dew point condition.16
4.10.3 Efficiency of the combustion ηηηη .16
4.10.4 Flue gas triple of variates .17

Foreword
This document (prEN 15544:2006) has been prepared by Technical Committee CEN/TC 295 “Residential
solid fuel burning appliances”, the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
This standard contains specifications for the dimensioning of Kachelgrundöfen/Putzgrundöfen (tiled/mortared
stoves). If the calculations of this standard are observed, the minimum energy efficiency of 78% and the
emission values of carbon monoxide 1.500 mg/m ³ (1.000 mg/MJ), nitrogen dioxide 225 mg/m ³ (150 mg/MJ),
n n
organically bound carbon 120 mg/m ³ (80 mg/MJ) and dust 90 mg/m ³ (60 mg/MJ) will be observed too.
n n
This calculation method for the dimensioning of Kachelgrundöfen/Putzgrundöfen (tiled/mortared stoves) is
based on appropriate literature as well as European standard EN 13384-1, whereat besides physical and
chemical formulas also empirically determined correlations are used.
Note: In case of a calculation method for different interior materials than fireclay the proof of the compliance of
the emission values has to be delivered separately. Furthermore the empiric data of the combustion chamber
dimensions, the minimum flue pipe length, the burning rate as well as the combustion chamber temperature
and the decrease of the temperature along the flue pipe have to be determined.
1 Scope
This standard contains specifications for the dimensioning of Kachelgrundöfen/Putzgrundöfen (tiled/mortared
stoves). The Kachelgrundöfen/Putzgrundöfen (one off tiled/mortared stoves) are constructed technically
individual. The standard can be used for log wood fired Kachelöfen (tile stoves) that burn one fuel load per
storage period with a maximum load between 10 and 40 kg and a storage period (nominal heating time)
between 8 and 24 h.
This standard is valid for Kachelgrundöfen/Putzgrundöfen (tiled/mortared stoves) equipped with fireclay as
interior material, with an apparent density between 1.750 and 2.200 kg/m³, a degree of porosity 18 up to 33
percent by volume and a heat conductivity from 0,65 up to 0,90 W/mK (temperature range 20 – 400 °C).
This standard is valid for Kachelgrundöfen/Putzgrundöfen (tiled/mortared stoves) with sidewise combustion air
supply of the combustion chamber.
This standard is not valid for combinations with water heat exchangers for central heating or other heat
absorbing elements like glass plates greater than 1/6 of the combustion chamber surface, open water tanks
etc. It is also not valid for combinations with heating/fireplace elements according to EN 13229. Furthermore
this standard is not valid for mass-produced prefabricated or partly prefabricated slow heat release appliances
according to EN 15250.
This calculation method can be used to proof requirements of emissions and energy efficiency in case of
burning log wood or wood briquettes according to the manual of the producer.
2 Normative references
EN 13384-1, Chimneys – Thermal and fluid dynamic calculation methods – Part 1: Chimneys serving one
appliance
3 Terms and definitions
3.1
construction with air gap
construction, with an air gap between the inner and the outer shell
3.2
construction without air gap
construction, with no air gap between the inner and the outer shell
3.3
combustion chamber base A
BR
area of an horizontal cut through the combustion chamber at the height of the lower edge of the firebox
opening
3.4
combustion chamber height H
BR
mean vertical distance between combustion chamber base and combustion chamber ceiling
3.5
combustion chamber surface O
BR
sum of the inner surfaces of the combustion chamber
3.6
mean combustion chamber temperature t
BR
value to calculate the thermal lift in the combustion chamber
3.7
burning rate m
BU
mean fuel load divided by burning time
3.8
combustion chamber admeasurement U
BR
admeasurement of the combustion chamber base
3.9
gas groove
additional opening for the conduction of the flue gas
3.10
flue pipe length L
Z
length of the connecting line of all geometric centres of the flue pipe profiles from the combustion chamber exit
to the connecting pipe entrance
3.11
Kachelgrundofen/tiled stove (also Kachelofen)
One off slow heat release appliance, which is adapted individually to the local conditions and whose visible
surface is predominantly made of tiles
3.12
short flue pipe section
section of the flue pipe, where the length of the section is shorter than the hydraulic diameter
3.13
minimum flue pipe length L
Zmin
minimal acceptable length of the flue pipe
3.14
maximum load m
B
load of the fuel at nominal heat output
3.15
minimum load m
Bmin
load of the fuel at the lowest reduced heat output
3.16
nominal heat output
mean useable heat output of the heating appliance
3.17
Putzgrundofen/mortared stove (also Putzofen)
One off slow heat release appliance, which is adapted individually to the local conditions and whose visible
surface is predominantly plastered
3.18
storage period (nominal heating time)
period of time while the nominal heat output is set free; has to be specified by the producer
3.19
efficiency
proportion (in percent) of the nominal heat output multiplied with the storage period to the total heat input
4 Calculations
4.1 Nominal heat output
The nominal heat output has to be specified.
4.2 Load of fuel
4.2.1 Maximum load
The maximum load of fuel is calculated as follows:
P ⋅t
n n
m =
(1)
B
3,25
-1
Note: To calculate the factor 3,25 in equation (1) a net calorific value of wood of 4,16 kWh*kg and an
efficiency of 0,78 (78%) are presumed.
With:
m maximum load (kg)
B
P specified nominal heat output (kW)
n
t specified storage period (h)
n
Note: The specified storage period can vary between 8 and 24 hours
4.2.2 Minimum load
The minimum load is fixed with 50 % of the maximum load.
m = 0,5 ⋅ m
Bmin B (2)
With:
m maximum load (kg)
B
m minimum load (kg)
Bmin
4.3 Design of the essential dimensions
4.3.1 Combustion chamber d
...