BS EN 13384-1:2015
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Chimneys. Thermal and fluid dynamic calculation methods – Chimneys serving one heating appliance
| Published By | Publication Date | Number of Pages |
| BSI | 2015 | 104 |
This European Standard specifies methods for the calculation of the thermal and fluid dynamic characteristics of chimneys serving one heating appliance. The methods in this part of this European Standard are applicable to negative or positive pressure chimneys with wet or dry operating conditions. It is valid for chimneys with heating appliances for fuels subject to the knowledge of the flue gas characteristics which are needed for the calculation. The methods in this part of this European Standard are applicable to chimneys with one inlet connected with one appliance. The methods in Part 2 of this European Standard are applicable to chimneys with multiple inlets and one inlet with multiple appliances. Part 3 describes methods for the development of diagrams and tables for chimneys serving one heating appliance.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 8 | 1 Scope 2 Normative references 3 Terms and definitions |
| 12 | 4 Symbols and abbreviations |
| 16 | 5 Calculation method for non-balanced flue chimneys 5.1 General principles |
| 17 | 5.2 Pressure requirements 5.2.1 Negative pressure chimneys |
| 18 | 5.2.2 Positive pressure chimneys 5.3 Temperature requirement |
| 19 | 5.4 Calculation procedure |
| 20 | 5.5 Flue gas data characterising the heating appliance 5.5.1 General 5.5.2 Flue gas mass flow 5.5.2.1 Flue gas mass flow at nominal heat output of the heating appliance 5.5.2.2 Flue gas mass flow at the lowest permissible heat output |
| 21 | 5.5.2.3 Flue gas mass flow at the maximum draught or minimum differential pressure of the heating appliances 5.5.2.4 Flue gas mass flow with secondary air 5.5.3 Flue gas temperature 5.5.3.1 Flue gas temperature at nominal heat output (TWN) 5.5.3.2 Flue gas temperature at the lowest possible heat output (TWmin) 5.5.3.3 Flue gas temperature at the maximum draught or minimum differential pressure of the heating appliances 5.5.4 Minimum draught for the heating appliance (PW) for negative pressure chimney |
| 22 | 5.5.5 Maximum draught for the heating appliance (PWmax) for negative pressure chimney 5.5.6 Maximum differential pressure of the heating appliance (PWO) for positive pressure chimney 5.5.7 Minimum differential pressure of the heating appliance (PWOmin) for positive pressure chimney 5.6 Characteristic data for the calculation 5.6.1 General 5.6.2 Mean value for roughness (r) 5.6.3 Thermal resistance (1/Λ) |
| 23 | 5.7 Basic values for the calculation 5.7.1 Air temperatures 5.7.1.1 General 5.7.1.2 External air temperature (TL) 5.7.1.3 Ambient air temperature (Tu) |
| 25 | 5.7.2 External air pressure (pL) 5.7.3 Gas constant 5.7.3.1 Gas constant of the air (RL) 5.7.3.2 Gas constant of the flue gas (R) |
| 26 | 5.7.4 Density of the external air (ρL) 5.7.5 Specific heat capacity of the flue gas (cp) 5.7.6 Condensing temperature (Tsp) 5.7.7 Correction factor for temperature instability (SH) 5.7.8 Flow safety coefficient (SE) |
| 27 | 5.8 Determination of the temperatures 5.8.1 General 5.8.2 Calculation of the coefficient of cooling (K) |
| 28 | 5.8.3 Coefficient of heat transmission (kb) 5.8.3.1 General 5.8.3.2 Internal coefficient of heat transfer (αi) |
| 30 | 5.8.3.3 External coefficient of heat transfer (αa) 5.9 Determination of the density of the flue gas and the velocity of the flue gas 5.9.1 Density of the flue gas (ρm) 5.9.2 Velocity of the flue gas (wm) |
| 31 | 5.10 Determination of the pressures 5.10.1 Pressure at the flue gas inlet into the chimney 5.10.1.1 Draught at the flue gas inlet into the negative pressure chimney (PZ and PZmax) 5.10.1.2 Positive pressure at the flue gas inlet into the positive pressure chimney (PZO and PZOmin) |
| 32 | 5.10.2 Theoretical draught available due to chimney effect (PH) 5.10.3 Pressure resistance of the chimney (PR) 5.10.3.1 General 5.10.3.2 Difference in pressure caused by change of velocity of the flue gas in the chimney (PG) |
| 33 | 5.10.3.3 Coefficient of flow resistance due to friction of the flue (ψ) 5.10.3.4 Coefficients of flow resistance (ζ) due to a directional and/or cross sectional change and/or mass flow change in the flue 5.10.4 Wind velocity pressure (PL) |
| 34 | 5.11 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) 5.11.1 General |
| 35 | 5.11.2 Minimum and maximum draught for the heating appliance (PW and PWmax) and maximum and minimum differential pressure of the heating appliance (PWO and PWOmin) 5.11.3 Effective pressure resistance of the connecting flue pipe (PFV) 5.11.3.1 General 5.11.3.2 Theoretical draught available due to the chimney effect of the connecting flue pipe (PHV) 5.11.3.3 Pressure resistance of the connecting flue pipe (PRV) |
| 36 | 5.11.4 Pressure resistance of the air supply (PB) |
| 37 | 5.12 Calculation of the inner wall temperature at the chimney outlet (Tiob) |
| 39 | 6 Secondary air for negative pressure chimneys 6.1 General 6.2 Calculation method 6.3 Basic values for the calculation of secondary air 6.3.1 General 6.3.2 Mixing calculations |
| 40 | 6.4 Pressures 6.4.1 Pressure resistance for the air supply with secondary air (PBNL) |
| 41 | 6.4.2 Draught required for the secondary air devices (PNL) |
| 42 | 6.4.3 Pressure resistance for that part of the connecting flue pipe before the secondary air device (PFV1) |
| 43 | 6.4.4 Pressure requirement with secondary air 6.5 Temperature requirement with secondary air 7 Calculation method for balanced flue chimneys 7.1 General principles |
| 44 | 7.2 Pressure requirements |
| 45 | 7.3 Temperature requirements 7.4 Calculation procedure 7.5 Flue gas data characterizing the heating appliance |
| 46 | 7.6 Characteristic data for the calculation 7.7 Basic values for the calculation 7.7.1 Air temperatures 7.7.1.1 General 7.7.1.2 External air temperature (TL) 7.7.1.3 Ambient air temperature (Tu) |
| 47 | 7.7.2 Other basic values 7.8 Determination of the temperatures 7.8.1 Non-concentric (separate) ducts 7.8.2 Concentric ducts – calculation based on a correction factor for heat radiation 7.8.2.1 General |
| 48 | 7.8.2.2 Temperatures in the connecting flue pipe and connecting air supply pipe segments |
| 50 | 7.8.2.3 Temperatures in the chimney and air supply duct segments |
| 53 | 7.8.2.4 Calculation of coefficient of cooling |
| 54 | 7.8.2.5 Coefficient of heat transmissions |
| 62 | 7.8.3 Concentric ducts – calculation based on calculated heat radiation 7.8.3.1 General |
| 63 | 7.8.3.2 System of formulas |
| 66 | 7.8.3.3 Coefficient of cooling 7.8.3.4 Coefficient of heat transmission 7.8.4 Mean temperatures for pressure calculation |
| 67 | 7.9 Determination of densities and velocities 7.9.1 Density and velocity of the flue gas 7.9.2 Density and velocity of the supply air |
| 68 | 7.10 Determination of pressures 7.10.1 Pressure at the flue gas inlet into the chimney 7.10.2 Theoretical draught due to chimney effect in the chimney segment (PH) 7.10.3 Pressure resistance in the chimney segment (PR) 7.10.4 Wind velocity pressure (PL) 7.11 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) 7.11.1 General |
| 69 | 7.11.2 Minimum and maximum draught for the heating appliance (PW and PWmax) and maximum and minimum differential pressure of the heating appliance (PWO and PWOmin) 7.11.3 Effective pressure resistance of the connection pipe (PFV) 7.11.4 Pressure resistance of the air supply 7.11.4.1 Draught due to chimney effect of the supply air duct (PHB) 7.11.4.2 Draught due to chimney effect of the connecting air supply pipe (PHBV) 7.11.4.3 Pressure resistance of the air supply duct (PRB) |
| 71 | 7.11.4.4 Pressure resistance of the connecting air supply pipe (PRBV) |
| 72 | 7.12 Calculation of the inner wall temperature at the chimney outlet (Tiob) 8 Consideration of the condensation heat of the flue gas water vapour 8.1 General |
| 73 | 8.2 Onset of condensation |
| 75 | 8.3 Calculation of the flue gas temperature at the outlet of a chimney segment with condensation (j ≥ NsegK) |
| 80 | 9 Consideration of chimney fans 9.1 General |
| 81 | 9.2 Inline fans |
| 82 | 9.3 Exhaust fans |
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