BS EN 13384-2:2015
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Chimneys. Thermal and fluid dynamic calculation methods – Chimneys serving more than one heating appliance
| Published By | Publication Date | Number of Pages |
| BSI | 2015 | 78 |
This part of EN 13384 specifies methods for calculation of the thermal and fluid dynamic characteristics of chimneys serving more than one heating appliance. This part of EN 13384 covers both the cases, either a) where the chimney is connected with more than one connecting flue pipe from individual or several appliances in a multi-inlet arrangement; or b) where the chimney is connected with an individual connecting flue pipe connecting more than one appliance in a cascade arrangement. The case of multiple inlet cascade arrangement is covered by the case a). This part of EN 13384 deals with chimneys operating under negative pressure conditions (there can be positive pressure condition in the connecting flue pipe) and with chimneys operating under positive pressure conditions and is valid for chimneys serving heating appliances for liquid, gaseous and solid fuels. This part of EN 13384 does not apply to: – chimneys with different thermal resistance or different cross-section in the various chimney segments. This part does not apply to calculate energy gain; – chimneys with open fire places, e.g. open fire chimneys or chimney inlets which are normally intended to operate open to the room; – chimneys which serve different kinds of heating appliances regarding natural draught, fan assisted, forced draught or combustion engine. Fan assisted appliances with draught diverter between the fan and the chimney are considered as natural draught appliances; – chimneys with multiple inlets from more than 5 storeys. (This does not apply to balanced flue chimney.); – chimneys serving heating appliances with open air supply through ventilation openings or air ducts, which are not installed in the same air supply pressure region (e.g. same side of building). For positive pressure chimneys this part only applies if any heating appliance which is out of action can be positively isolated to prevent flue gas back flow.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 9 | 1 Scope 2 Normative references |
| 10 | 3 Terms and definitions |
| 11 | 4 General symbols and abbreviations 5 Calculation method 5.1 General principles |
| 13 | 5.2 Pressure equilibrium condition 5.2.1 Negative pressure chimneys |
| 14 | 5.2.2 Positive pressure chimneys |
| 15 | 5.3 Mass flow requirement 5.4 Pressure requirements 5.4.1 Negative pressure chimneys |
| 16 | 5.4.2 Positive pressure chimneys |
| 17 | 5.5 Temperature requirement 5.6 Calculation procedure |
| 20 | 6 Flue gas data characterising the heating appliance |
| 21 | 7 Data for chimney and connecting flue pipes |
| 22 | 8 Basic data for the calculation 8.1 General 8.2 Air temperatures 8.2.1 External air temperature (TL) 8.2.2 Ambient air temperature (Tu) 8.3 External air pressure (pL) 8.4 Gas constant 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) |
| 23 | 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 |
| 25 | 10 Mixing calculations 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) |
| 26 | 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 10.7.1 Specific heat capacity (cpV,j), (cp,j) 10.7.2 Thermal conductivity of the flue gas (λAV,j), (λA,j) |
| 27 | 10.7.3 Dynamic viscosity (ηAV,j), (ηA,j) 10.7.4 Condensing temperature (TSP) 11 Density and velocity of the flue gas |
| 28 | 12 Determination of the pressures 12.1 Pressures at each inlet of the chimney segments 12.1.1 Draught 12.1.2 Positive pressure |
| 29 | 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) 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 |
| 30 | 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) |
| 31 | 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) 12.2.1 Minimum required and maximum allowed draught 12.2.2 Maximum available and minimum allowed differential pressure |
| 32 | 12.2.3 Calculated pressure resistance of the connecting flue pipe (PV,j) 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) |
| 34 | 12.2.3.4 Coefficient of flow resistance (ζ) 12.2.4 Calculated pressure resistance of the air supply (PBc,j) |
| 35 | 13 Inner wall temperature 14 Cascade installations 14.1 Principle of the calculation method |
| 36 | 14.2 Pressure equilibrium condition 14.2.1 Negative pressure cascade installation |
| 37 | 14.2.2 Positive pressure cascade installation |
| 38 | 14.3 Mass flow requirement 14.4 Pressure requirements 14.4.1 Negative pressure chimneys |
| 39 | 14.4.2 Positive pressure chimneys |
| 40 | 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 14.7.1 Pressure at the flue gas inlet into the collector segment (PZC,j,l or PZOC,j,l) 14.7.1.1 Draught |
| 41 | 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) |
| 43 | 14.7.1.5 Pressure at the inlet of the chimney segment (PZ,j and PZmax,j or PZO,j and PZOmin,j) |
| 44 | 14.7.2 Pressures required or available at the outlet of the connecting flue pipe (PZeC,j,l, PZOeC,j,l) 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) |
| 46 | 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 15.1 Principle of the calculation method 15.2 Pressure equilibrium condition |
| 47 | 15.3 Mass flow requirement 15.4 Pressure requirements 15.4.1 Negative pressure chimneys 15.4.2 Positive pressure chimneys |
| 49 | 15.5 Temperature requirements 15.6 Calculation procedure for balanced flue chimneys |
| 51 | 15.7 Mass flow of the supply air |
| 52 | 15.8 Determination of the temperatures in balanced flue chimneys 15.8.1 Separate ducts 15.8.2 Concentric ducts 15.8.2.1 General |
| 53 | 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 |
| 56 | 15.8.2.4 Coefficient of heat transmission between the supply air and the ambient air |
| 57 | 15.8.2.5 Cooling value of the flue duct 15.8.2.6 Cooling value of the air supply duct |
| 58 | 15.8.2.7 Flue gas temperature at the end of the chimney segment |
| 59 | 15.8.2.8 Temperature of the flue gas averaged over the length of a chimney segment 15.8.2.9 Temperature of the supply air averaged over the length of a chimney segment 15.8.2.10 Iteration |
| 60 | 15.8.3 Concentric connection pipes 15.8.3.1 Coefficient of heat transmission between the flue and the air supply passage of concentric connection pipes |
| 62 | 15.8.3.2 Coefficient of heat transmission between the supply air and the ambient air for concentric connection pipes |
| 64 | 15.8.3.3 Flue gas temperature at the end of the flue of concentric connection pipes (ToV,j) |
| 65 | 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 supply air averaged over the length of the concentric connection pipes |
| 66 | 15.9 Pressures of the air supply ducts 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) |
| 68 | 15.9.4 Pressure resistance of the air supply duct of the connection pipe j (PRBV,j) |
| 70 | 15.10 Density and velocity of the supply air 15.10.1 Density and velocity of the supply air in the air supply duct averaged over the length of the chimney segment 15.10.2 Density and velocity of the supply air averaged over the length of the connection pipes |
| 71 | 16 Consideration of chimney fans 16.1 General |
| 72 | 16.2 Inline fans |
| 73 | 16.3 Exhaust fans |
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