SIST EN 15544:2009
(Main)One off Kachelgrundöfen/Putzgrundöfen (tiled/mortared stoves) - Dimensioning
One off Kachelgrundöfen/Putzgrundöfen (tiled/mortared stoves) - Dimensioning
This standard specifies calculations for the dimensioning of Kachelgrundöfen/Putzgrundöfen (tiled/mortared stoves) based upon the required nominal heat output of the stove as declared by the producer. The Kachelgrundöfen/Putzgrundöfen (tiled/mortared stoves) are of individual one-off construction design. 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 kg and 40 kg and a storage period (nominal heating time) between 8 h 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 kg/m³ and 2,200 kg/m³, a degree of porosity from 18 % up to 33 % by volume and a heat conductivity from 0,65 W/mK up to 0,90 W/mK (temperature range 20 °C to 400 °C).
This standard is valid for Kachelgrundöfen/Putzgrundöfen (tiled/mortared stoves) with sidewise combustion air supply of the combustion chamber and an inflow speed from 2 m/s to 4 m/s, whereas the height of the lowest opening is at least 5 cm above the bottom 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.
NOTE Although for the purposes of this standard these calculations are applicable only to the requirements of this standard, the same calculations can be used for other purposes, e.g. to verify emission levels and energy efficiency in case of burning log wood or wood briquettes according to the producer’s manual.
Ortsfest gesetzte Kachelgrundöfen/Putzgrundöfen - Auslegung
Die vorliegende Norm enthält Festlegungen für die Bemessung von Kachelgrundöfen/Putzgrundöfen auf
Basis der erforderlichen Nennwärmeleistung, wie sie vom Hersteller angegeben wurde. Dabei handelt es sich
um handwerklich individuell gesetzte Kachelöfen/Putzöfen. Die Norm ist auf Scheitholz befeuerte Kachelöfen
mit einmaliger Brennstoffauflage je Speicherdauer mit maximalen Brennstoffmassen zwischen 10 kg und
40 kg und einer Speicherdauer (Nennheizzeit) von 8 h bis 24 h anzuwenden.
Diese Norm gilt für Kachelgrundöfen/Putzgrundöfen mit dem Ausbaustoff Schamotte mit einer Rohdichte
zwischen 1 750 kg/m3 und 2 200 kg/m3, einer offenen Porosität von 18 Vol. % bis 33 Vol. % sowie einer
Wärmeleitfähigkeit im Temperaturbereich von 20 °C bis 400 °C zwischen 0,65 W/mK und 0,90 W/mK.
Diese Norm gilt für Kachelgrundöfen/Putzgrundöfen mit seitlicher Verbrennungsluftzufuhr in den Brennraum
und einer Einlassgeschwindigkeit von 2 m/s bis 4 m/s, wobei die Höhe der tiefsten Öffnung mindestens 5 cm
oberhalb des Bodens der Brennkammer liegt.
Diese Norm gilt nicht für Kombinationen mit Wasserwärmetauscher für Zentralheizungen oder andere Wärme
entziehende Einbauten, wie Wasserschiff, Glasscheiben größer als 1/6 der Brennraum-Innenfläche und
dergleichen, und gilt nicht für Kombinationen mit Heizeinsätzen/Kamineinsätzen gemäß EN 13229. Diese
Norm gilt weiterhin nicht für in Serie vorgefertigte bzw. teilvorgefertigte Speichereinzelfeuerstätten nach
EN 15250.
ANMERKUNG Obwohl die Berechnungen dieser Norm vorliegend ausschließlich auf Anforderungen ebendieser Norm
anwendbar sind, können diese Berechnungen auch für andere Zwecke benutzt werden, beispielsweise zur Messung von
Emissionswerten und Energieeffizienz bei Verfeuerung von Scheitholz oder Holzbriketts gemäß Bedienungsanleitung des
Herstellers.
Poêles en faïence/kachelöfen - Dimensionnement
La présente Norme spécifie des calculs pour le dimensionnement des Kachelgrundöfen/Putzgrundöfen (poêles en faïence, poêles en maçonnerie fabriqués in situ) fondés sur la puissance calorifique nominale requise du poêle et déclarée par le fabricant. Les Kachelgrundöfen/Putzgrundöfen (poêles en faïence, poêles en maçonnerie fabriqués in situ) sont conçus sous forme de construction artisanale. La Norme peut être utilisée pour des Kachelöfen (poêles en faïence) à bûches de bois qui brûlent une charge de combustible par période d’accumulation avec une charge maximale comprise entre 10 kg et 40 kg et une période d’accumulation (temps de chauffage nominal) comprise entre 8 h et 24 h.
La présente Norme est applicable aux Kachelgrundöfen/Putzgrundöfen (poêles en faïence, poêles en maçonnerie fabriqués in situ) dont le matériau intérieur est de l’argile réfractaire de masse volumique apparente comprise entre 1,750 kg/m3 et 2,200 kg/m3, d’un degré de porosité compris entre 18 % et 33 % en volume et d’une conductivité thermique comprise entre 0,65 W/mK et 0,90 W/mK (plage de température de 20 °C à 400 °C).
La présente Norme est applicable aux Kachelgrundöfen/Putzgrundöfen (poêles en faïence, poêles en maçonnerie fabriqués in situ) avec une alimentation en air de combustion transversale de la chambre de combustion et une vitesse d’afflux comprise entre 2 m/s et 4 m/s, attendu que la hauteur de l’ouverture la plus basse est au moins 5 cm au dessus du bas de la chambre de combustion.
La présente Norme ne s’applique pas aux combinaisons avec des échangeurs thermiques à eau pour chauffage central ou autres éléments athermiques, tels que des plaques de verre, supérieurs à 1/6 de la surface de la chambre de combustion, des réservoirs d’eau ouverts, etc. De même, elle ne s’applique pas aux combinaisons avec des éléments de chauffage/de foyer conformes à l’EN 13229.
Lončene peči - Dimenzioniranje
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Ortsfest gesetzte Kachelgrundöfen/Putzgrundöfen - AuslegungPoêles en faïence/kachelöfen - DimensionnementOne off Kachelgrundöfen/Putzgrundöfen (tiled/mortared stoves) - Dimensioning97.100.30Grelniki na trdo gorivoSolid fuel heatersICS:Ta slovenski standard je istoveten z:EN 15544:2009SIST EN 15544:2009en,fr,de01-december-2009SIST EN 15544:2009SLOVENSKI
STANDARD
SIST EN 15544:2009
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 15544July 2009ICS 97.100.30 English VersionOne off Kachelgrundöfen/Putzgrundöfen (tiled/mortared stoves)- DimensioningPoêles en faïence, poêles en maçonnerie fabriqués in situ -DimensionnementOrtsfest gesetzte Kachelgrundöfen/Putzgrundöfen -AuslegungThis European Standard was approved by CEN on 19 June 2009.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 CEN 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 CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, 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.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre:
Avenue Marnix 17,
B-1000 Brussels© 2009 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 15544:2009: ESIST EN 15544:2009
EN 15544:2009 (E) 2 Contents Page Foreword .3Introduction .41Scope .52Normative references .53Terms and definitions .54Calculations .74.1Nominal heat output .74.2Load of fuel .74.2.1Maximum load .74.2.2Minimum load .74.3Design of the essential dimensions.74.3.1Combustion chamber dimensions .74.3.2Minimum flue pipe length .94.3.3Gas groove profile .94.4Calculation of the burning rate . 104.5Fixing of the air ratio . 104.6Combustion air, flue gas . 104.6.1Combustion air flow rate . 104.6.2Flue gas flow rate. 114.6.3Flue gas mass flow rate . 114.7Calculations of the density . 124.7.1Combustion air density . 124.7.2Flue gas density . 124.8Calculation of the flue gas temperature . 124.8.1Mean combustion chamber temperature . 124.8.2Flue gas temperature in the flue pipe . 134.8.3Flue gas temperature in the connecting pipe . 134.8.4Flue gas temperature at chimney entrance, mean flue gas temperature of the chimney and temperature of the chimney wall at the top of the chimney . 134.9Calculation of flow mechanics . 134.9.1Calculation of the standing pressure . 134.9.2Calculation of the flow velocity . 144.9.3Calculation of the static friction . 144.9.4Calculation of the resistance due to direction change . 154.10Operation control . 174.10.1Pressure condition . 174.10.2Dew point condition. 174.10.3Efficiency of the combustion ηηηη . 174.10.4Flue gas triple of variates . 18Bibliography . 19 SIST EN 15544:2009
EN 15544:2009 (E) 3 Foreword This document (EN 15544:2009) has been prepared by Technical Committee CEN/TC 295 “Residential solid fuel burning appliances”, the secretariat of which is held by BSI. 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 January 2010, and conflicting national standards shall be withdrawn at the latest by January 2010. 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. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, 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 the United Kingdom. SIST EN 15544:2009
EN 15544:2009 (E) 4 Introduction This standard specifies a calculation method for the dimensioning of Kachelgrundöfen/Putzgrundöfen (tiled/mortared stoves) based upon the required nominal heat output of the stove as declared by the producer. If the calculations of this standard are observed, the minimum energy efficiency of 78% and the emission values of carbon monoxide 1 500 mg/mn³ (1 000 mg/MJ), nitrogen dioxide 225 mg/mn³ (150 mg/MJ), organically bound carbon 120 mg/mn³ (80 mg/MJ) and dust 90 mg/mn³ (60 mg/MJ) will be observed too. This calculation method for the dimensioning of Kachelgrundöfen/Putzgrundöfen (tiled/mortared stoves) is based on appropriate literature as well as EN 13384-1, and where empirically determined correlations are used in addition to physical and chemical formulas. NOTE In case of a calculation method for different interior materials than fireclay the proof of the compliance of the emission values should 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 should also be determined. SIST EN 15544:2009
EN 15544:2009 (E) 5 1 Scope This standard specifies calculations for the dimensioning of Kachelgrundöfen/Putzgrundöfen (tiled/mortared stoves) based upon the required nominal heat output of the stove as declared by the producer. The Kachelgrundöfen/Putzgrundöfen (tiled/mortared stoves) are of individual one-off construction design. 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 kg and 40 kg and a storage period (nominal heating time) between 8 h 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 kg/m³ and 2,200 kg/m³, a degree of porosity from 18 % up to 33 % by volume and a heat conductivity from 0,65 W/mK up to 0,90 W/mK (temperature range 20 °C to 400 °C). This standard is valid for Kachelgrundöfen/Putzgrundöfen (tiled/mortared stoves) with sidewise combustion air supply of the combustion chamber and an inflow speed from 2 m/s to 4 m/s, whereas the height of the lowest opening is at least 5 cm above the bottom 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. NOTE Although for the purposes of this standard these calculations are applicable only to the requirements of this standard, the same calculations can be used for other purposes, e.g. to verify emission levels and energy efficiency in case of burning log wood or wood briquettes according to the producer’s manual. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. 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 ABR area of a horizontal cut through the combustion chamber at the height of the lower edge of the firebox opening 3.4 combustion chamber height HBR mean vertical distance between the combustion chamber base and the combustion chamber ceiling SIST EN 15544:2009
EN 15544:2009 (E) 6 3.5 combustion chamber surface OBR sum of the inner surfaces of the combustion chamber 3.6 mean combustion chamber temperature tBR value to calculate the thermal lift in the combustion chamber 3.7 burning rate mBU mean fuel load divided by burning time 3.8 combustion chamber admeasurement UBR admeasurement of the combustion chamber base 3.9 gas groove additional opening for the conduction of the flue gas 3.10 flue pipe length LZ 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 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 LZmin minimal acceptable length of the flue pipe 3.14 maximum load mB load of the fuel at nominal heat output 3.15 minimum load mBmin 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 local conditions and whose visible surface is predominantly plastered 3.18 storage period (nominal heating time) period of time specified by the producer where the nominal heat output is set free SIST EN 15544:2009
EN 15544:2009 (E) 7 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 required nominal heat output (Pn) of the stove shall be specified by the producer so that the dimensions of the stove can be calculated in accordance with clauses 4.2 to 4.10. 4.2 Load of fuel 4.2.1 Maximum load The maximum load of fuel shall be calculated as follows: 3,25nnBtPm×= (1) NOTE 1 To calculate the factor 3,25 in equation (1), a net calorific value of
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Ortsfest gesetzte Kachelgrundöfen/Putzgrundöfen - AuslegungPoêles en faïence/kachelöfen - DimensionnementOne off Kachelgrundöfen/Putzgrundöfen (tiled/mortared stoves) - Dimensioning97.100.30Grelniki na trdo gorivoSolid fuel heatersICS:Ta slovenski standard je istoveten z:prEN 15544kSIST prEN 15544:2009en01-februar-2009kSIST prEN 15544:2009SLOVENSKI
STANDARD
kSIST prEN 15544:2009
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMFINAL DRAFTprEN 15544December 2008ICS 97.100.30 English VersionOne off Kachelgrundöfen/Putzgrundöfen (tiled/mortared stoves)- DimensioningKachelgrundöfen/Putzgrundöfen (poêles de masse enfaïence/en crépi) - DimensionnementOrtsfest gesetzte Kachelgrundöfen/Putzgrundöfen -AuslegungThis draft European Standard is submitted to CEN members for unique acceptance procedure. It has been drawn up by the TechnicalCommittee CEN/TC 295.If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations whichstipulate 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 languagemade by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has thesame status as the official versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, 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.Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice andshall not be referred to as a European Standard.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre:
Avenue Marnix 17,
B-1000 Brussels© 2008 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. prEN 15544:2008: EkSIST prEN 15544:2009
prEN 15544:2008 (E) 2 Contents Page 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
kSIST prEN 15544:2009
prEN 15544:2008 (E) 3 Foreword This document (prEN 15544:2008) 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 Unique Acceptance Procedure. This standard specifies a calculation method for the dimensioning of Kachelgrundöfen/Putzgrundöfen (tiled/mortared stoves) based upon the required nominal heat output of the stove as declared by the producer. If the calculations of this standard are observed, the minimum energy efficiency of 78% and the emission values of carbon monoxide 1 500 mg/mn³ (1 000 mg/MJ), nitrogen dioxide 225 mg/mn³ (150 mg/MJ), organically bound carbon 120 mg/mn³ (80 mg/MJ) and dust 90 mg/mn³ (60 mg/MJ) will be observed too. This calculation method for the dimensioning of Kachelgrundöfen/Putzgrundöfen (tiled/mortared stoves) is based on appropriate literature as well as EN 13384-1, and where empirically determined correlations are used in addition to physical and chemical formulas. NOTE In case of a calculation method for different interior materials than fireclay the proof of the compliance of the emission values should 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 should also be determined. kSIST prEN 15544:2009
prEN 15544:2008 (E) 4 1 Scope This standard specifies calculations for the dimensioning of Kachelgrundöfen/Putzgrundöfen (tiled/mortared stoves) based upon the required nominal heat output of the stove as declared by the producer. The Kachelgrundöfen/Putzgrundöfen (tiled/mortared stoves) are of individual one-off construction design. 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 kg and 40 kg and a storage period (nominal heating time) between 8 h 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 kg/m³ and 2,200 kg/m³, a degree of porosity from 18 % up to 33 % by volume and a heat conductivity from 0,65 W/mK up to 0,90 W/mK (temperature range 20 °C to 400 °C). This standard is valid for Kachelgrundöfen/Putzgrundöfen (tiled/mortared stoves) with sidewise combustion air supply of the combustion chamber and an inflow speed from 2 m/s to 4 m/s, whereas the height of the lowest opening is at least 5 cm above the bottom 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. NOTE Although for the purposes of this standard these calculations are applicable only to the requirements of this standard, the same calculations can be used for other purposes, e.g. to verify emission levels and energy efficiency in case of burning log wood or wood briquettes according to the producer’s manual. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. 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 ABR area of a horizontal cut through the combustion chamber at the height of the lower edge of the firebox opening 3.4 combustion chamber height HBR mean vertical distance between the combustion chamber base and the combustion chamber ceiling kSIST prEN 15544:2009
prEN 15544:2008 (E) 5 3.5 combustion chamber surface OBR sum of the inner surfaces of the combustion chamber 3.6 mean combustion chamber temperature tBR value to calculate the thermal lift in the combustion chamber 3.7 burning rate mBU mean fuel load divided by burning time 3.8 combustion chamber admeasurement UBR admeasurement of the combustion chamber base 3.9 gas groove additional opening for the conduction of the flue gas 3.10 flue pipe length LZ 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 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 LZmin minimal acceptable length of the flue pipe 3.14 maximum load mB load of the fuel at nominal heat output 3.15 minimum load mBmin 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 local conditions and whose visible surface is predominantly plastered 3.18 storage period (nominal heating time) period of time specified by the producer where the nominal heat output is set free kSIST prEN 15544:2009
prEN 15544:2008 (E) 6 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 required nominal heat output (Pn) of the stove shall be specified by the producer so that the dimensions of the stove can be calculated in accordance with clauses 4.2 to 4.10. 4.2 Load of fuel 4.2.1 Maximum load The maximum load of fuel shall be calculated as follows: 3,25nnBtPm×= (1) NOTE To calculate the factor 3,25 in equation (1), a net calorific value of wood of 4,16 kWh*kg-1 and an efficiency of 0,78 (78%) was presumed. where mB
is the maximum load (kg); Pn
is the specified nominal heat output (kW); tn
is the specified storage period (h). NOTE
The specified storage period can vary between 8 h and 24 h. 4.2.2 Minimum load The minimum load shall be calculated as 50 % of the maximum load as follows: BBmin5,0mm×= (2) where mB
is the maximum load (kg); mBmin
is the minimum load (kg). 4.3 Design of the essential dimensions 4.3.1 Combustion chamber dimensions NOTE Designing the dimensions of the combustion chamber serves two main purposes: first
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