EN 15544:2009

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

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.NOTEAlthough 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.