BS EN 13384-1:2015+A1:2019

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Chimneys. Thermal and fluid dynamic calculation methods – Chimneys serving one combustion appliance

Published By	Publication Date	Number of Pages
BSI	2019	108

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Categories: 91.060.40 - Chimneys, shafts, ducts, BSI

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Description

This European Standard specifies methods for the calculation of the thermal and fluid dynamic characteristics of chimneys serving one combustion 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 combustion 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 combustion appliance.

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PDF Pages	PDF Title
2	undefined
9	1 Scope 2 Normative references 3 Terms and definitions
14	4 Symbols and abbreviations
19	5 Calculation method for non-balanced flue chimneys 5.1 General principles 5.2 Pressure requirements 5.2.1 Negative pressure chimneys
20	5.2.2 Positive pressure chimneys
21	5.3 Temperature requirement 5.4 Calculation procedure
22	5.5 Flue gas data characterising the !combustion”appliance 5.5.1 General 5.5.2 !Flue gas mass flow and combustion air mass flow 5.5.2.1 Flue gas mass flow and combustion air mass flow at nominal heat output of the combustion appliance
23	5.5.3 Flue gas temperature 5.5.3.1 Flue gas temperature at nominal heat output (TWN)
24	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 !combustion”appliances 5.5.4 Minimum draught for the !combustion” appliance (PW) for negative pressure chimney
25	5.5.5 Maximum draught for the !combustion” appliance (PWmax) for negative pressure chimney 5.5.6 Maximum differential pressure of the !combustion” appliance (PWO) for positive pressure chimney 5.5.7 Minimum differential pressure of the !combustion” 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)
26	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)
28	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) 5.7.4 Density of the external air (ρL)
29	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) 5.8 Determination of the temperatures 5.8.1 General
30	5.8.2 Calculation of the coefficient of cooling (K) 5.8.3 Coefficient of heat transmission (kb) 5.8.3.1 General
31	5.8.3.2 Internal coefficient of heat transfer (αi)
32	5.8.3.3 External coefficient of heat transfer (αa)
33	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) 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)
34	5.10.1.2 Positive pressure at the flue gas inlet into the positive pressure chimney (PZO and PZOmin) 5.10.2 Theoretical draught available due to chimney effect (PH)
35	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)
36	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)
37	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
38	5.11.2 Minimum and maximum draught for the !combustion” appliance (PW and PWmax) and maximum and minimum differential pressure of the !combustion” 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)
39	5.11.4 Pressure resistance of the air supply (PB)
40	5.12 Calculation of the inner wall temperature at the chimney outlet (Tiob)
42	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
43	6.4 Pressures 6.4.1 Pressure resistance for the air supply with secondary air (PBNL)
45	6.4.2 Draught required for the secondary air devices (PNL)
46	6.4.3 Pressure resistance for that part of the connecting flue pipe before the secondary air device (PFV1) 6.4.4 Pressure requirement with secondary air 6.5 Temperature requirement with secondary air
47	7 Calculation method for balanced flue chimneys 7.1 General principles
48	7.2 Pressure requirements 7.3 Temperature requirements 7.4 Calculation procedure
49	7.5 Flue gas data characterizing the !combustion” appliance 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)
50	7.7.2 Other basic values 7.8 Determination of the temperatures 7.8.1 Non-concentric (separate) ducts
51	7.8.2 Concentric ducts – calculation based on a correction factor for heat radiation 7.8.2.1 General 7.8.2.2 Temperatures in the connecting flue pipe and connecting air supply pipe segments
53	7.8.2.3 Temperatures in the chimney and air supply duct segments
56	7.8.2.4 Calculation of coefficient of cooling
58	7.8.2.5 Coefficient of heat transmissions
66	7.8.3 Concentric ducts – calculation based on calculated heat radiation 7.8.3.1 General 7.8.3.2 System of formulas
70	7.8.3.3 Coefficient of cooling 7.8.3.4 Coefficient of heat transmission 7.8.4 Mean temperatures for pressure calculation
71	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 !combustion” air
72	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)
73	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 7.11.2 Minimum and maximum draught for the !combustion” appliance (PW and PWmax) and maximum and minimum differential pressure of the !combustion” 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 !combustion” air duct (PHB) 7.11.4.2 Draught due to chimney effect of the connecting air supply pipe (PHBV)
74	7.11.4.3 Pressure resistance of the air supply duct (PRB)
75	7.11.4.4 Pressure resistance of the connecting air supply pipe (PRBV)
76	7.12 Calculation of the inner wall temperature at the chimney outlet (Tiob)
77	8 Consideration of the condensation heat of the flue gas water vapour 8.1 General 8.2 Onset of condensation
80	8.3 Calculation of the flue gas temperature at the outlet of a chimney segment with condensation (j ≥ NsegK)
85	9 Consideration of chimney fans 9.1 General
86	9.2 Inline fans
87	9.3 Exhaust fans
88	Annex A (informative)Calculation of thermal resistance
89	Annex B (informative)Tables
106	Annex C (informative)Chimney outlet with regard to adjacent buildings
107	Annex D (informative)Determination of the gas constant R considering the condensation

Additional information

Status	Definitive
Title	Chimneys. Thermal and fluid dynamic calculation methods – Chimneys serving one combustion appliance
Corrects	BS EN 13384-1:2015+A1:2019
Replaces	BS EN 13384-1:2002+A2:2008
Publisher	BSI
Committee	B/506
Pages	108
Publication Date	2019-08-23
ISBN	978 0 539 06149 9
Standard Number	BS EN 13384-1:2015+A1:2019
Identical National Standard Of	EN 13384-1:2015+A1:2019
Descriptors	Fluid dynamics, Thermal transmittance, Mathematical calculations, Construction systems parts, Pressure, Flues, Chimneys, Structural systems, Thermal resistance
ICS Codes	91.060.40 - Chimneys, shafts, ducts

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