SIST EN 15036-2:2007

SLOVENSKI STANDARD
01-februar-2007
Kotli za gretje – Postopek preskušanja emisije hrupa po zraku iz generatorjev
toplote – 2. del: Emisija hrupa dimnih plinov na izstopu iz generatorja toplote
Heating boilers - Test regulations for airborne noise emissions from heat generators -
Part 2: Flue gas noise emissions at the outlet of the heat generator
Heizkessel - Prüfverfahren für Luftschallemissionen von Wärmeerzeugern - Teil 2:
Abgasgeräuschemissionen am Ausgang des Wärmeerzeugers
Chaudieres de chauffage - Regles d´essais des émissions de bruit aérien des
générateurs de chaleur - Partie 2: Émissions de bruit de cheminée a la sortie du
générateur
Ta slovenski standard je istoveten z: EN 15036-2:2006
ICS:
17.140.20 Emisija hrupa naprav in Noise emitted by machines
opreme and equipment
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 15036-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2006
ICS 17.140.20; 91.140.10
English Version
Heating boilers - Test regulations for airborne noise emissions
from heat generators - Part 2: Flue gas noise emissions at the
outlet of the heat generator
Chaudières de chauffage - Règles d´essais des émissions Heizkessel - Prüfverfahren für Luftschallemissionen von
de bruit aérien des générateurs de chaleur - Partie 2: Wärmeerzeugern - Teil 2: Abgasgeräuschemissionen am
Émissions de bruit de cheminée à la sortie du générateur Ausgang des Wärmeerzeugers
This European Standard was approved by CEN on 14 August 2006.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Central Secretariat or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,
Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2006 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 15036-2:2006: E
worldwide for CEN national Members.

Contents Page
Foreword.3
Introduction .4
1 Scope .5
2 Normative references .5
3 Terms and definitions .6
4 Set-up and measurement equipment.7
5 Test arrangements.12
6 Test procedure.13
7 Calculations.13
8 Test report .14
Annex A (informative) Guidelines for the design and construction of an anechoic termination .16
Annex B (informative) Testing of anechoic terminations.19
Annex C (normative) Procedure for calculating the A-weighted sound power level from the
octave band or one-third-octave band sound power levels.21
Annex D (informative) Uncertainty of the measurement process .22
Bibliography .23

Foreword
This document (EN 15036-2:2006) has been prepared by Technical Committee CEN/TC 57 “Central heating
boilers”, the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by March 2007, and conflicting national standards shall be withdrawn at
the latest by March 2007.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden,
Switzerland and United Kingdom.
Introduction
Establishing the A-weighted sound pressure level and its spectral distribution in the flue gas path of a heat
generator is significant for estimating the noise emission expected in the vicinity and for the rating of flue gas
silencers. This European Standard describes a procedure for measuring sound pressure levels in the flue gas
path of heat generators derived from EN ISO 5136:2003.
The sound power radiated from a heat generator through its flue gas path depends to some extent on the
design of the flue gas system (changes in direction and cross-section, installations, and natural frequencies)
as described by the acoustic impedance. Any measurement procedure therefore requires the measurement
duct to be specified unambiguously if comparable readings are to be obtained. In the procedure described
here, the measurement duct has a circular cross-section and is fitted with a low-reflection end-piece as
described in annex A. The sound power measured under these conditions can be regarded as representative
for all practical applications.
The level of measurement uncertainty is described by the standard deviation that is to be expected if the same
readings are taken in different laboratories.
1 Scope
This European Standard applies to heat generators according to EN 15036-1, which are connected to
chimneys/ducts which discharge combustion products via a duct into open air.
The data measured according to this European Standard will probably be different from the noise radiated
from the end of the chimney.
Readings from forced-draught burners complying with EN 267 or EN 676 are only applicable in practice if they
have been taken in conjunction with a boiler. Noise emitted into chimneys/ducts by heat generators operating
independently of indoor air can also be measured in accordance with this European Standard.
Boilers supplied with combined air inlet and exhaust terminal configuration where ducts are within an external
wall can be measured according to one of the test methods detailed in EN 15036-1.
This European Standard describes the objective procedure for determining sound power levels L at the
W,
outlet of a heat generator that is emitting broad-band, narrow-band, or tonal continuous sound.
This European Standard is applicable to boilers designed to be connected to a chimney or flue duct with a
duct size greater than or equal to 0,06 m and whose mean flue gas flow at the microphone head is less than
5 m/s.
This European Standard only applies for test purposes under laboratory conditions.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
EN 437, Test gases — Test pressures — Appliance categories
EN 15036-1, Heating boilers — Test regulations for airborne noise emissions from heat generators — Part 1:
Airborne noise emissions from heat generators
CEN/TR 1749, European scheme for the classification of gas appliances according to the method of
evacuation of the combustion products (types)
EN 60942, Electroacoustics — Sound calibrators (IEC 60942:2003)
EN 61260, Electroacoustics — Octave band and fractional-octave-band filters (IEC 61260:1995)
EN 61672-1, Electroacoustics — Sound level meters — Part 1: Specifications (IEC 61672-1:2002
EN ISO 266, Acoustics — Preferred frequencies (ISO 266 1997)
3 Terms and definitions
For the purposes of this European Standard, the following terms and definitions apply.
3.1 duct
3.1.1
test duct
duct in which a heat generator’s sound power is measured
NOTE The test duct has an anechoic termination.
3.1.2
intermediate duct
duct fitted to the intake side and to the discharge side of the heat generator to ensure desired flow conditions
NOTE The intermediate duct connects to the test duct, if necessary by a transition section.
3.2
sound pressure level
L
p
p
L = 10lg dB
p
p
where
p is the mean square root value of the sound pressure and the reference sound pressure p is equal to 20 µ
Pa
NOTE 1 The width of a restricted frequency band should be indicated, for example, octave-band sound pressure level,
one-third-octave-band sound pressure level.
NOTE 2 L , L and L are sound pressure levels at each of the three measurement positions in the test duct.
p1 p2 p3
Sound pressure levels may also be obtained from a continuous circumferential traverse (see 5.2).
L is the spatially averaged sound pressure level obtained from averaging over three measurements positions in
pm
the test duct. It may also be obtained from a continuous circumferential traverse (see 5.2).
L is the spatially averaged sound pressure level at the measurement plane, corrected for the combined
p
free-field response C (see Table 1 and 8.1)
NOTE 3 The sound pressure level is expressed in decibels (dB).
[EN ISO 5136:2003, definition 3.5]
3.3
sound power level
L
W
P
L = 10lg dB
W
P
where
P is the sound power and the reference sound power P is equal to 1 pW
NOTE 1 The width of a restricted frequency band should be indicated, for example, octave-band sound power level,
one-third-octave-band sound power level.
NOTE 2 The sound power level is expressed in decibels (dB).
[EN ISO 5136:2003, definition 3.6]
4 Set-up and measurement equipment
4.1 General
For the tests the boiler shall be installed and fired with fuels in accordance with the appliance manufacturer’s
instructions. For a gas boiler the test gas shall be in accordance with the appliance category and EN 437. The
fuel used for the test shall be stated in the test report.
According to CEN/TR 1749, the test arrangement for type B and type C boilers with non-concentric ducts,
shall consist of the boiler under test, an intermediate duct, the test duct with anechoic termination and the
instrumentation (see Figure 1 and Figure 2).
According to CEN/TR 1749, the test arrangement for type C boilers with concentric ducts (C1 and C3), shall
consist of the boiler under test to which is applied the pressure drop corresponding to the maximum length of
flue declared by the manufacturer, its test duct with anechoic termination and the instrumentation. For type C
boilers which can only be installed with short flue ducts e. g. 300 mm which are supplied with the boiler by the
appliance manufacturer shall be measured using one of the test methods according to EN 15036-1.
Key
1 boiler d diameter of test duct, in m (at least 0,06 m)
2 intermediate duct (if required) d diameter of flue gas outlet from the boiler, in m
3 transitions duct (if required) l length of intermediate duct, in m
4 test duct (Measurement level) l length of transitions, in m
5 anechoic termination (see annex A, for details) l length of test duct, in m
6 pressure outlet point l distance of the microphone position, in m.
m3
7 microphone
Figure 1 — Test configuration for rear outlet
Key
1 boiler d diameter of test duct, in m (at least 0,06 m)
2 intermediate duct (if required) d diameter of intermediate duct, in m
3 transitions duct (if required) d diameter of flue gas outlet from the boiler, in m
H
4 test duct (measurement level) l length of bent, in m (max 0,25 m)
5 anechoic termination (see annex A for details) l length of intermediate duct, in m
6 pressure outlet point l length of transitions, in m
7 microphone l length of test duct, in m
8 bent l length of flue gas outlet, in m (max 1 m)
9 flue gas outlet l distance of the microphone position, in m
m3
Figure 2 — Test configuration for top outlet
All connections between the heat generator and the duct shall be rigid unless a vibration-isolated coupling is
an integral component part of the heat generator. A mounting for a microphone shall be provided at the point
on the measurement duct identified for this purpose in Figure 1 and Figure 2.
The pressure at the outlet of the boiler should be set at the required level given by the manufacturer; any
deviation should be recorded.
If the flue gas outlet of the boiler is vertically mounted, a bend shall be installed directly behind this outlet. The
test duct shall be connected to this bend. The ratio of the bend's radius to the diameter of the duct shall be as
big as possible, in order to minimise the bend's influence on the transmitted noise.
4.2 Specification of the duct
4.2.1 Design of ducts and transitions
The duct shall be straight, coaxial with the outlet of the heat generator, and of a constant circular cross-section
all along its length. The duct and transitions shall be made either of steel or of a material with an equivalent
area-mass and rigidity, in order to ensure a smooth, reverberate internal surface so that no vibrations can
occur that could affect the readings.
4.2.2 Duct lengths and distances between them
The duct lengths and the distances between them shall be selected in accordance with the specifications
shown in Figure 1, Figure 2 and Table 1.
Table 1 — Duct lengths
Duct Length
m
l = d
Intermediate duct
1 1
Length of transitions l = see 4.2.3
l ≥ 4 × d or ≥ 1 m (whichever is the greater)
Test duct
3 0
Distance of the microphone position l = 0,5 × l
m3 3
NOTE To achieve greater accuracy at lower frequencies (i.e. below 50 Hz) the length of test duct l should be
increased to 4 m or 6 x d diameter of the test duct.
The duct cross-sectional areas are shown in Table 2 where “S” represents the cross-sectional area in m of
the flue gas outlet at the heat generator.
Table 2 — Duct cross-sectional areas
Duct Cross-sectional area
Minimum Maximum
0,95 × S 1,07 × S
Intermediate duct
Test duct 0,7 × S 2,1 × S
4.2.3 Transition ducts
The test or terminating duct shall be coupled directly to the intermediate duct, or where there is a change of
cross-sectional area, indirectly by means of a transition duct. The diameter ratio of the transition shall lie within
the limits specified in Table 2.
For acoustic reasons the length of the transition shall be such that the minimum length of transition l
2min
conforms to equation (1):
 S 
l
 
l ≥ l − 1 (1)
2min 0
 
S
s
 
where:
l 1 m;
S larger area;
l
S smaller area.
s
For aerodynamic reasons the outlet transition shall have an opening angle not exceeding 15° and in many
cases, this will be the factor that will determine the length.
4.2.4 Anechoic termination
The pressure reflection coefficient r of the anechoic
...