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BS EN 13384-2:2015+A1:2019 Chimneys. Thermal and fluid dynamic calculation methods - Chimneys serving more than one combustion appliance, 2019
- National foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 General symbols and abbreviations
- 5 Calculation method [Go to Page]
- 5.1 General principles
- 5.2 Pressure equilibrium condition [Go to Page]
- 5.2.1 Negative pressure chimneys
- 5.2.2 Positive pressure chimneys
- 5.3 Mass flow requirement
- 5.4 Pressure requirements [Go to Page]
- 5.4.1 Negative pressure chimneys
- 5.4.2 Positive pressure chimneys
- 5.5 Temperature requirement
- 5.6 Calculation procedure
- 6 Flue gas data characterising the !combustion" appliance
- 7 Data for chimney and connecting flue pipes
- 8 Basic data for the calculation [Go to Page]
- 8.1 General
- 8.2 Air temperatures [Go to Page]
- 8.2.1 External air temperature (TL)
- 8.2.2 Ambient air temperature (Tu)
- 8.3 External air pressure (pL)
- 8.4 Gas constant [Go to Page]
- 8.4.1 Gas constant of the air (RL)
- 8.4.2 Gas constant of flue gas (R)
- 8.5 Density of air (ρL)
- 8.6 Specific heat capacity of the flue gas (cp)
- 8.7 Water vapour content (σ(H2O),j) and condensing temperature (Tsp)
- 8.8 Correction factor for temperature instability (SH)
- 8.9 Flow safety coefficient (SE)
- 8.10 External coefficient of heat transfer
- 9 Determination of temperatures
- 10 Mixing calculations [Go to Page]
- 10.1 General
- 10.2 Flue gas mass flow ()
- 10.3 Flue gas temperature at the inlet of the chimney segment (Te,j)
- 10.4 CO2-content of the flue gas in the chimney segment (σ(CO2),j)
- 10.5 H2O-content of the flue gas (σ(H2O),j)
- 10.6 Gas constant of the flue gas (R,j)
- 10.7 Flue gas data [Go to Page]
- 10.7.1 Specific heat capacity (cpV,j), (cp,j)
- 10.7.2 Thermal conductivity of the flue gas (λAV,j), (λA,j)
- 10.7.3 Dynamic viscosity (ηAV,j), (ηA,j)
- 10.7.4 Condensing temperature (TSP)
- 11 Density and velocity of the flue gas
- 12 Determination of the pressures [Go to Page]
- 12.1 Pressures at each inlet of the chimney segments [Go to Page]
- 12.1.1 Draught
- 12.1.2 Positive pressure
- 12.1.3 Draught due to chimney effect in the chimney segment (PH,j)
- 12.1.4 Pressure resistance in the chimney segment (PR,j) [Go to Page]
- 12.1.4.1 General
- 12.1.4.2 Coefficient of flow resistance due to friction of the flue (ψ)
- 12.1.4.3 Pressure resistance coefficients
- 12.1.4.4 Pressure change in flue gas due to change of the flue gas velocity
- 12.1.4.5 Pressure loss due to mixing in the area of the inlet of the chimney segment (P13)
- 12.2 Minimum draught required at the flue gas inlet into the chimney and maximum allowed draught (PZe and PZemax) and maximum and minimum differential pressure at the flue gas inlet into the chimney (PZOe and PZOemin) [Go to Page]
- 12.2.1 Minimum required and maximum allowed draught
- 12.2.2 Maximum available and minimum allowed differential pressure
- 12.2.3 Calculated pressure resistance of the connecting flue pipe (PV,j) [Go to Page]
- 12.2.3.1 General
- 12.2.3.2 Draught due to chimney effect in the connecting flue pipe (PHV,j)
- 12.2.3.3 Pressure resistance of the connecting flue pipe (PRV,j)
- 12.2.3.4 Coefficient of flow resistance (ζ)
- 12.2.4 Calculated pressure resistance of the air supply (PBc,j)
- 13 Inner wall temperature
- 14 Cascade installations [Go to Page]
- 14.1 Principle of the calculation method
- 14.2 Pressure equilibrium condition [Go to Page]
- 14.2.1 Negative pressure cascade installation
- 14.2.2 Positive pressure cascade installation
- 14.3 Mass flow requirement
- 14.4 Pressure requirements [Go to Page]
- 14.4.1 Negative pressure chimneys
- 14.4.2 Positive pressure chimneys
- 14.5 Temperature requirement
- 14.6 Calculation procedure
- 14.7 Pressures at the outlet of the connecting flue pipe and pressures at the inlet of the collector segment [Go to Page]
- 14.7.1 Pressure at the flue gas inlet into the collector segment (PZC,j,l or PZOC,j,l) [Go to Page]
- 14.7.1.1 Draught
- 14.7.1.2 Positive pressure
- 14.7.1.3 Draught due to chimney effect in the collector segment (PHC,j,l)
- 14.7.1.4 Pressure resistance in the collector segment (PRC,j,l)
- 14.7.1.5 Pressure at the inlet of the chimney segment (PZ,j and PZmax,j or PZO,j and PZOmin,j)
- 14.7.2 Pressures required or available at the outlet of the connecting flue pipe (PZeC,j,l, PZOeC,j,l) [Go to Page]
- 14.7.2.1 Required draught
- 14.7.2.2 Available positive pressure
- 14.7.2.3 Calculated pressure resistance of the connecting flue pipe (PV,j,l)
- 14.7.2.4 Pressure resistance of the air supply (PB,j,l)
- 14.8 Inner wall temperature (TiobC,j,l)
- 15 Balanced flue chimney [Go to Page]
- 15.1 Principle of the calculation method
- 15.2 Pressure equilibrium condition
- 15.3 Mass flow requirement
- 15.4 Pressure requirements [Go to Page]
- 15.4.1 Negative pressure chimneys
- 15.4.2 Positive pressure chimneys
- 15.5 Temperature requirements
- 15.6 Calculation procedure for balanced flue chimneys
- 15.7 Mass flow of the !combustion" air
- 15.8 Determination of the temperatures in balanced flue chimneys [Go to Page]
- 15.8.1 Separate ducts
- 15.8.2 Concentric ducts [Go to Page]
- 15.8.2.1 General
- 15.8.2.2 Principle of calculation for the determination of the temperature
- 15.8.2.3 Coefficient of heat transmission between the flue and the air supply passage
- 15.8.2.4 Coefficient of heat transmission between the !combustion" air and the ambient air
- 15.8.2.5 Cooling value of the flue duct
- 15.8.2.6 Cooling value of the air supply duct
- 15.8.2.7 Flue gas temperature at the end of the chimney segment
- 15.8.2.8 Temperature of the flue gas averaged over the length of a chimney segment
- 15.8.2.9 Temperature of the !combustion" air averaged over the length of a chimney segment
- 15.8.2.10 Iteration
- 15.8.3 Concentric connection pipes [Go to Page]
- 15.8.3.1 Coefficient of heat transmission between the flue and the air supply passage of concentric connection pipes
- 15.8.3.2 Coefficient of heat transmission between the !combustion" air and the ambient air for concentric connection pipes
- 15.8.3.3 Flue gas temperature at the end of the flue of concentric connection pipes (ToV,j)
- 15.8.3.4 Temperature of the flue gas averaged over the length of the concentric connection pipes
- 15.8.3.5 Temperature of the !combustion" air averaged over the length of the concentric connection pipes
- 15.9 Pressures of the air supply ducts [Go to Page]
- 15.9.1 Draught due to chimney effect of the air supply duct of chimney segment j
- 15.9.2 Draught due to chimney effect of the air supply duct of connection pipes
- 15.9.3 Pressure resistance of the air supply duct of the chimney segment j (PRB,j)
- 15.9.4 Pressure resistance of the air supply duct of the connection pipe j (PRBV,j)
- 15.10 Density and velocity of the !combustion" air [Go to Page]
- 15.10.1 Density and velocity of the !combustion" air in the air supply duct averaged over the length of the chimney segment
- 15.10.2 Density and velocity of the !combustion" air averaged over the length of the connection pipes
- 16 Consideration of chimney fans [Go to Page]
- 16.1 General
- 16.2 Inline fans
- 16.3 Exhaust fans
- Annex A (informative)Recommendations [Go to Page]
- A.1 General
- A.2 Recommendations for the chimney and !combustion" appliances
- A.3 Recommendations for connecting flue pipes
- Annex B (informative)Characteristics for the !combustion" appliance [Go to Page]
