SIST EN 13053:2001
(Main)Ventilation for buildings - Air handling units - Ratings and performance for units, components and sections
Ventilation for buildings - Air handling units - Ratings and performance for units, components and sections
This European Standard specifies requirements and testing for ratings and performance of air handling units as a whole.
It also specifies requirements, classification, and testing of specific components and sections of air handling units. For many components and sections it refers to component standards, but it also specifies restrictions or applications of standards developed for standalone components.
This standard is applicable both to standardized designs, which may be in a range of sizes having common construction concepts, and also to custom-design units. It also applies both to air handling units, which are completely prefabricated, and to units which are built up on site. Generally the units within the scope of this standard include at least a fan, a heat exchanger and an air filter.
This standard is not applicable to the following:
a) air conditioning units serving a limited area in a building, such as fan coil units;
b) units for residential buildings;
c) units producing ventilation air mainly for a manufacturing process.
Lüftung von Gebäuden - Zentrale raumlufttechnische Geräte - Leistungskenndaten für Geräte, Komponenten und Baueinheiten
Die vorliegende Europäische Norm legt Anforderungen für zentrale raumlufttechnische Geräte (RLT-Geräte) als Gesamtheit fest und schreibt die Prüfung der Leistungskenndaten vor.
Sie legt auch Anforderungen, Klassifizierung und Prüfung für spezielle Komponenten und Baueinheiten von RLT-Geräten fest. Bei vielen Komponenten und Baueinheiten wird auf spezielle Produktnormen verwiesen; es werden jedoch auch Einschränkungen bzw. Anwendungen für Normen festgelegt, die für spezielle Produkte erarbeitet wurden.
Diese Norm ist sowohl auf Standardkonstruktionen, die Bestandteil einer Baureihe mit gemeinsamen Konstruktionsmerkmalen sein können, als auch auf kundenspezifisch ausgelegte Geräte anwendbar. Sie gilt sowohl für vollständig vorgefertigte RLT-Geräte als auch für solche, die vor Ort aufgebaut werden. Die im Anwendungsbereich dieser Norm liegenden RLT-Geräte weisen mindestens einen Ventilator, einen Wärme-austauscher und einen Luftfilter auf.
Die Norm ist auf folgende Fälle nicht anwendbar:
a) Geräte, die nur einen begrenzten Bereich innerhalb eines Gebäudes versorgen, wie z. B. Ventilatorkon-vektoren;
b) Geräte zur Wohnungslüftung;
c) Geräte, welche die Luft vorwiegend für einen Produktionsprozess aufbereiten.
Ventilation des bâtiments - Caissons de traitement d'air - Classification et performance, composants et sections
La présente Norme européenne spécifie les prescriptions et les essais pour les évaluations et la performance des caissons de traitement d'air pris dans leur ensemble.
Elle spécifie également les prescriptions, la classification et l'essai des composants et sections spécifiques des caissons de traitement d'air. Pour un grand nombre de composants et de sections, elle se réfere aux normes de composants, mais elle spécifie également les restrictions concernant l'application des normes mises au point pour les composants individuels.
La présente norme s'applique aux caissons de conceptions normalisées, qui peuvent etre dans une plage de dimensions ayant des concepts communs de construction, et également aux caissons de conception spécifique. Elle s'applique aussi a la fois aux caissons de traitement d'air entierement préfabriqués et aux caissons construits sur site. En regle générale, les caissons qui s'inscrivent dans le cadre de la présente norme comprennent au moins un ventilateur, un échangeur de chaleur et un filtre a air.
La présente norme n'est pas applicable aux équipements suivants :
a) caissons de climatisation desservant une aire limitée dans un bâtiment, tels que les ventilo-convecteurs ;
b) caissons pour immeubles résidentiels ;
c) caissons produisant de l'air de ventilation, principalement pour un procédé de fabrication.
Prezračevanje stavb - Centralne enote - Ocenitev in lastnosti enot, komponent in sekcij
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 13053:2001
01-december-2001
3UH]UDþHYDQMHVWDYE&HQWUDOQHHQRWH2FHQLWHYLQODVWQRVWLHQRWNRPSRQHQWLQ
VHNFLM
Ventilation for buildings - Air handling units - Ratings and performance for units,
components and sections
Lüftung von Gebäuden - Zentrale raumlufttechnische Geräte - Leistungskenndaten für
Geräte, Komponenten und Baueinheiten
Ventilation des bâtiments - Caissons de traitement d'air - Classification et performance,
composants et sections
Ta slovenski standard je istoveten z: EN 13053:2001
ICS:
91.140.30 3UH]UDþHYDOQLLQNOLPDWVNL Ventilation and air-
VLVWHPL conditioning
SIST EN 13053:2001 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 13053:2001
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SIST EN 13053:2001
EUROPEAN STANDARD
EN 13053
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2001
ICS 23.120; 91.140.30
English version
Ventilation for buildings - Air handling units - Ratings and
performance for units, components and sections
Ventilation des bâtiments - Caissons de traitement d'air - Lüftung von Gebäuden - Zentrale raumlufttechnische
Classification et performance des caissons, composants et Geräte - Leistungskenndaten für Geräte, Komponenten und
sections Baueinheiten
This European Standard was approved by CEN on 18 August 2001.
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 Management Centre 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 Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, 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
© 2001 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13053:2001 E
worldwide for CEN national Members.
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SIST EN 13053:2001
EN 13053:2001 (E)
Contents page
Foreword. 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 5
4 Symbols and units. 7
5 Ratings and performance of the whole air handling unit . 9
6 Components and sections in air-handling units . 17
7 Hygiene requirements. 24
Annex A (normative) Air handling units - Heat recovery – Defrosting - Requirements and
testing . 27
(informative)
Annex B Instructions for installation, operation and maintenance . 30
Annex C (informative) Air handling unit - Example of product specification . 31
2
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SIST EN 13053:2001
EN 13053:2001 (E)
Foreword
This European Standard has been prepared by Technical Committee CEN/TC 156 "Ventilation for buildings",
the secretariat of which is held by BSI.
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 April 2002, and conflicting national standards shall be withdrawn at
the latest by April 2002.
This European Standard is a part of a series of standards for air handling units used for ventilation and air
conditioning of buildings for human occupancy. It considers the ratings and the performance of air handling
units as a whole, the requirements and performance of specific components and sections of air handling
units including hygiene requirements. It is supported by the standard for mechanical performance, EN
1886:1998. The position of this standard in the field of mechanical building services is shown in Figure 1.
Mechanical Building
Services
Control Ventilation and Heating
systems air conditioning systems
systems
Ductwork Air handling Installation
units
Mechanical Ratings and
performance performance,
components and
sections
Air handling Fan Coils Heat
unit as a sections recovery
whole sections
Damper Mixing Filter Humidifiers
sections sections sections
Figure 1 — Position in the field of mechanical building services
Annex A is normative. Annexes B and C are informative.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark,
Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal,
Spain, Sweden, Switzerland and the United Kingdom.
3
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SIST EN 13053:2001
EN 13053:2001 (E)
1 Scope
This European Standard specifies requirements and testing for ratings and performance of air handling units
as a whole.
It also specifies requirements, classification, and testing of specific components and sections of air handling
units. For many components and sections it refers to component standards, but it also specifies restrictions
or applications of standards developed for standalone components.
This standard is applicable both to standardized designs, which may be in a range of sizes having common
construction concepts, and also to custom-design units. It also applies both to air handling units, which are
completely prefabricated, and to units which are built up on site. Generally the units within the scope of this
standard include at least a fan, a heat exchanger and an air filter.
This standard is not applicable to the following:
a) air conditioning units serving a limited area in a building, such as fan coil units;
b) units for residential buildings;
c) units producing ventilation air mainly for a manufacturing process.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other publications.
These normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply
to this European Standard only when incorporated in it by amendment or revision. For undated references
the latest edition of the publication referred to applies (including amendments).
EN 305, Heat exchangers — Definitions of performance of heat exchangers and the general test procedure
for establishing performance of all heat exchangers
EN 308, Heat exchangers — Test procedures for establishing performance of air to air and flue gases heat
recovery devices
EN 779, Particulate air filters for general ventilation — Requirements, testing, marking
EN 1216, Heat exchangers — Forced circulation air-cooling and air-heating coils — Test procedures for
establishing the performance
EN 1751:1998, Ventilation for buildings — Air terminal devices — Aerodynamic testing of dampers and
valves
EN 1886:1998, Ventilation for buildings — Air handling units — Mechanical performance
EN 10088-2, Stainless steel — Part 2: Technical delivery conditions for sheet/plate and strip for general
purposes
CR 12792, Ventilation for buildings — Symbols and terminology
prEN 13030:1997, Ventilation for buildings — Terminals — Performance testing of louvres subjected to
simulated rain
EN 25136, Acoustics — Determination of sound power radiated into a duct by fans — In-duct method (ISO
5136:1990 and Technical Corrigendum 1:1993)
EN ISO 3741, Acoustics — Determination of sound power levels of noise sources using sound pressure —
Precision methods for reverberation rooms (ISO 3741:1999)
EN ISO 3744, Acoustics — Determination of sound power levels of noise sources using sound pressure —
Engineering methods in an essentially free field over a reflecting plane (ISO 3744:1994)
EN ISO 3746, Acoustics — Determination of sound power levels of noise sources using sound pressure —
Survey method using an enveloping measurement surface over a reflecting plane (ISO 3746:1995)
EN ISO 7235, Acoustics — Measurement procedures for ducted silencers — Insertion loss, flow noise and
total pressure loss (ISO 7325:1991)
EN ISO 9614-1, Acoustics — Determination of sound power levels of noise sources using sound intensity —
Part 1: Measurement at discrete points (ISO 9614-1:1993)
EN ISO 9614-2, Acoustics — Determination of sound power levels of noise sources using sound intensity —
Part 2: Measurement by scanning (ISO 9614-2:1996)
prEN ISO 9614-3:2000, Acoustics – Determination of sound power levels of noise sources using sound
intensity – Part 3: Precision method for measurement by scanning (ISO/DIS 9614-3:2000)
ISO 3966, Measurement of fluid flow in closed conduits — Velocity area method using pitot-static tubes
4
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SIST EN 13053:2001
EN 13053:2001 (E)
ISO 5167-1, Measurement of fluid flow by means of pressure differential devices – Part 1: Orifice plates,
nozzles and Venturi tubes inserted in circular cross-section conduits running full
ISO/TR 5168, Measurement of fluid flow — Evaluation of uncertainties.
ISO 5221, Air distribution and air diffusion — Rules to methods of measuring air flow rate in an air-handling
duct
ISO 5801:1997, Industrial fans — Performance testing using standardized airways
3 Terms and definitions
For the purposes of this standard the terms and definitions given in CR 12792, together with the following,
apply.
3.1
air handling unit
factory made encased assembly consisting of sections containing a fan or fans and other necessary
equipment to perform one or more of the following functions: circulating, filtration, heating, cooling, heat
recovery, humidifying, dehumidifying and mixing of air
3.2
section of air handling unit
functional element of an air-handling unit, consisting of one or more components in a single casing
3.3
component of air handling unit
smallest discrete functional element of an air-handling unit
3.4
blow-through unit
air handling unit with a section or sections downstream of the supply air fan
3.5
casing of an air-handling unit
enclosure of the unit, within which the components are mounted
3.6
openings for outdoor air, supply air, extract air, recirculation air and exhaust air
aperture through which air is taken in or discharged from the air-handling unit, such as openings for outdoor
air, supply air, recirculation air and exhaust air
3.7
damper section
section of air handling unit including a damper or valve
3.8
mixing section
section where the outdoor air flow and the recirculation air flow are mixed in a controlled way. The section
generally consists of one damper per air flow and a mixing chamber
3.9
filter section
section including a filter or filters and associated framework
3.10
heat recovery section
section in which heat (and possibly also moisture) is transferred from one airstream into another, either
directly or using an intermediary heat transfer medium
3.11
air heating and cooling coils
heat exchangers by means of which heat is transferred from a heat transfer medium to air (heating coil) or
the other way round (cooling coil)
5
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SIST EN 13053:2001
EN 13053:2001 (E)
3.12
sound attenuation section
section in which sound transfer into ductwork or to ambient air is reduced
3.13
humidifier section
section in which moisture is added to the air
3.14
fan section
section in which one or more fans are installed
3.15
combined section
section within which two or more functions are combined
3.16
functions
3.16.1
air treatment
process by which the state of the air is modified with respect to one or more of its temperature, moisture
content, dust content, bacterial count, gas and vapour contents
3.16.2
air type
designation of the air moving through a ventilation, air conditioning or air treatment installation as a function
of its location relative to the installation , e.g. outdoor air, exhaust air, extract air etc
3.16.3
cooling
removal of latent and/or sensible heat
3.16.4
dehumidification
controlled reduction of water vapour from the air
3.16.5
filtration
removal of particulate material from a fluid or gas
3.16.6
heating
transfer of heat from one body or medium to another medium
3.16.7
humidification
controlled addition of water vapour to an air stream or space
3.16.8
sound reduction
controlled reduction of sound energy
3.17
characteristics
3.17.1
air flow
movement of air within set boundaries (such as ducts)
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SIST EN 13053:2001
EN 13053:2001 (E)
3.17.2
air flow rate
mass or volume flow of air passing a given plane divided by time
3.17.3
bypass factor
ratio of the diverted flow to the sum of the main flow and the diverted flow
3.17.4
bypass leakage
unwanted and uncontrolled passing of untreated air into the treated air between the components within a
casing, such as filters and coils
3.17.5
deflection of a casing [see: bulging, caving]
deformation in mm of the external surfaces of the enclosure when subjected to a positive (bulging) or
negative (caving) pressure. It is given as the measured difference in distance between a reference plane and
the maximum point of deflection when subjected to air pressure
3.17.6
defrosting heat ratio
ratio between the energy transferred into the supply air and the maximum recoverable energy in exhaust air,
excluding the energy input for defrosting
3.17.7
air leakage factor f
air tightness expressed as the air leakage per unit envelope area (external air leakage)
3.17.8
air leakage rate q
vl
air leakage of the air handling unit, subject to air pressure (external air leakage)
3.17.9
external total pressure difference
difference between the total gauge pressure at the outlet of the air handling unit and the total gauge pressure
at the inlet
3.17.10
humidification efficiency
ratio between the mass of water evaporated by the humidifier and the theoretical mass needed to achieve
saturation at a given temperature
3.17.11
internal air leakage rate
air leakage in between the two air streams within a section
3.7.12
thermal bridging factor k
b
ratio between the lowest temperature difference between any point on the external surface and the mean
internal air temperature, and the mean air to air temperature difference
3.17.13
thermal transmittance U
heat flow per area and unit temperature difference
4 Symbols and units
For the purposes of this standard, symbols and units given in CR 12792 and in Table 1 apply, together with
those defined with the formulae, in text and in the annexes of this standard.
7
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SIST EN 13053:2001
EN 13053:2001 (E)
Table 1 — Symbols, units and subscripts
Symbol Term Unit
2
A Cross sectional area of a duct m
c
-1
c
sound velocity in the air m· s
d effective duct diameter m
-1 -2
f
air leakage factor l · s · m
k number of measurements within the total measuring time -
k
thermal bridging factor of the casing -
b
L Duct end correction value dB
e
L
sound power level dB
W
L weighted sound power level dB(A)
WA
-1
n
rotational speed of the fan s
F
P motor input power W
E
p
atmospheric pressure Pa
a
p dynamic pressure Pa
d
p
static gauge pressure Pa
s
p fan pressure Pa
f
p
external total pressure difference Pa
t
p external total pressure difference of the unit Pa
t
U
p
partial pressure of water vapour Pa
v
Q total energy input for defrosting during one complete J
defr
frosting/defrosting cycle
-1
q nominal air mass flow rate of the recovery device kg · s
mn
-1
q
air mass flow rate kg · s
m
3 -1
q air volume flow rate m · s
v
3 -1
q measured and converted air volume flow rate m · s
vm
3 -1
q specified air volume flow rate m · s
vs
t
dry-bulb temperature °C
a
t local temperature at measurement point °C
m,i
t
mean internal air temperature °C
i
t tolerance range %
u uncertainty range of measured data %
u local grade of uniformity %
Loc
-2 -1
U
thermal transmittance of the casing W· m · K
-1
v velocity of air at a point m · s
sampling interval time s
p pressure drop on exhaust-air side Pa
1
defrosting heat ratio -
D
temperature mixing efficiency %
t
local mixing efficiency %
Loc
-3
density kg · m
8
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SIST EN 13053:2001
EN 13053:2001 (E)
Table 1 — Symbols, units and subscripts [concluded]
Subscripts
1 inlet
2 outlet
11 exhaust air in
12 exhaust air out
21 supply air in
22 supply air out
i internal
H air flow with higher temperature
L air flow with lower temperature
M mixed air flow [mean temperature]
tot air flow downstream of the mixing section
5 Ratings and performance of the whole air handling unit
5.1 General
The performance of the whole air-handling unit cannot be defined as a sum of those of the individual
components and sections. Hence, the procedures that follow shall be applied to a complete air-handling unit.
In particular and agreed circumstances they can be applied to a part of an air-handling unit.
The methods described in 5.2 cover the measurement of air volume flow together with the external total
pressure of the unit and the power consumption. By selecting an appropriate test system the procedures can
be extended to include the measurement of sound level transmitted from the air-handling unit into the
ductwork, at a known volume flow, as described in 5.3.
5.2 Testing of aerodynamic performance
5.2.1 Characteristics and quantities
5.2.1.1 Characteristics
a) External total pressure difference of the unit: Air volume flow - characteristic. The difference in total
pressure between outlet and inlet of the air-handling unit, related to the air volume flow at the
measurement plane.
b) Motor input power: Air volume flow - characteristic. The relationship between the power input to the
fan motor and the air volume flow.
These characteristics shall be converted from the ambient temperature and pressure measured at the time of
-3
the test to standard conditions with air density of 1,2 kg.m . The characteristics shall be presented for a
stated nominal fan speed but without adjustment for inherent speed deviation during the test.
5.2.1.2 Quantities
a) Air volume flow rate (q ). This shall be measured by any method, which is in accordance with
v
ISO 5221, ISO 5167-1 or ISO 3966, e.g. a nozzle, an orifice plate or a pitot-static tube.
b) External total pressure difference of the unit (p ). This shall be calculated from the pressure
tU
measurements defined in 5.2.3.2, and is the difference between the total pressure at the outlet of
the air handling unit and the total pressure at the inlet. The duct sizes shall be the sizes defined by
the manufacturer.
NOTE International agreement defines the fan pressure p in terms of the difference in stagnation pressures
t
between outlet and inlet, but the Mach Number applicable to an air handling unit will be sufficiently low (less than 0,15)
for total pressures to be determined by conventional means. Hence, external total pressure difference is:
p p p (1)
t t2 t1
where
p is the sum of the static pressure p and the dynamic pressure p , in pascals (p for outlet, p for
t s d t2 t1
inlet)
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SIST EN 13053:2001
EN 13053:2001 (E)
c) Density of air (). This shall be given in kilograms per cubic metre, by the following expression
according to ISO 5801:1997:
p 0,378 p
a v
(2)
287273 t
a
where
p is the atmospheric pressure, in pascals;
a
p is the partial pressure of water vapour in the air, in pascals;
v
287 is the gas constant of dry air, in joules per kilogram and kelvin;
t is the dry-bulb temperature, in degrees Celsius.
a
d) Temperature of the air (t ,). This shall be measured near to the plane of flow measurement.
a
e) Rotational speed of the fan (n ). This shall be measured at each test point.
F
Motor input power (P ). The power to the fan motor shall be measured at each test point. The
f)
E
applied voltage and the current to each phase shall also be recorded when measured.
5.2.2 Test method
5.2.2.1 Basis of method
Tests shall be carried out in accordance with one of the methods shown in ISO 5801:1997. Test installation
type B, C or D shall be adopted according to which is most suited to the geometry of the air-handling unit and
the facilities available.
The three installation types are as follows:
- installation type B: free inlet, ducted outlet
- installation type C: ducted inlet, free outlet
- installation type D: ducted inlet, ducted outlet
In the above classification the terms shall be taken to have the following meanings:
Free inlet or outlet signifies that the air enters or leaves the air-handling unit directly from or to the
unobstructed free atmosphere. Ducted inlet or outlet signifies that the air enters or leaves the unit through a
duct directly connected to the unit inlet or outlet respectively.
5.2.2.2 Chamber test method
Where a standardized test chamber is used it shall conform to the requirements of Section 30 of
ISO 5801:1997.
5.2.2.3 Ducted test method
The common parts of a ducted system, for Types B, C or D installations, shall conform to the requirements of
Section 29 of ISO 5801:1997. The cross-sectional dimensions of the air outlet shall be used to determine the
dimensions of the outlet ducting required in a Type B or Type D installation, and the inlet ducting required in
a Type C or Type D installation.
5.2.3 Measurement procedure
5.2.3.1 Conditions for measurements
Dampers that control the flow of air in the part of the air-handling unit that is to be tested shall be fully open.
Other dampers that form part of a different air circuit, e.g. bypass and recirculation dampers, shall be fully
closed.
All elements included in the design of the air handling unit shall be fitted as intended, with filters clean and
coils dry.
5.2.3.2 Measurements
Atmospheric pressure and temperature shall be measured at commencement of the test, additional
observations being made if the test is prolonged.
Pressure measurements, at the locations and in the manner described in ISO 5801:1997, shall be recorded
at a sufficient number of test points to enable the characteristic curve to be plotted through the specified duty
point, or over the full operating range, whichever is required.
The pressure difference across each filter stage, for clean filters, shall be measured and recorded for each
test point.
Rotational speed of the fan and the electrical input to the fan motor shall be recorded at each of the test
points.
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EN 13053:2001 (E)
5.2.4 Evaluation of results
For each operating point, the external total pressure of the unit and the air volume flow shall be calculated in
accordance with ISO 5801:1997. It is sufficient, in most circumstances, to adopt the simplified procedures
applicable when the Mach Number is less than 0,15 and the fan pressure ratio less than 1,02 (corresponding
to a pressure rise less than 2000 Pa in ambient air).
The external total pressure and the motor input power shall be converted to values corresponding to the
-3
standard air density of 1,20 kg · m .
Where the duty specified is for an intermediate or final filter condition then the external total pressure
increase derived from this procedure shall be reduced by the calculated pressure difference between the
measured clean filter pressure drop and that for the intermediate or final condition (as appropriate).
5.3 Testing of acoustic performance
5.3.1 General
5.3.1.1 Acoustic tests
5.3.1.1.1 Duct borne noise tests
Measurement of the sound levels transmitted by the unit into the inlet ducting and the outlet ducting shall be
conducted in accordance with test methods specified in one of the following:
EN ISO 3741, EN ISO 3744, EN ISO 3746, EN ISO 9614 and EN 25136
5.3.1.1.2 Casing radiated noise test
The casing radiated noise emitted by the complete air-handling unit shall be determined in accordance with
one of the following test methods
EN ISO 3741, EN ISO 3744, EN ISO 3746 and EN ISO 9614
NOTE In the case of air-handling units with free inlets or outlets, the casing radiated sound level includes the sound
emitted by the free inlet or outlet.
5.3.1.1.3 Casing insertion loss test
The measurement of the acoustic insulation of the casing shall be as specified in 8.8 of EN 1886:1998.
5.3.1.2 Operating point
The air-handling unit shall work at the operating point defined by the air-handling unit manufacturer.
5.3.1.3 Ductwork
The ductworks shall be sized to match the manufacturer's recommended outlet or inlet opening and shall
maintain a constant cross section. Ductwork lengths shall be at least 3 effective duct diameters, but not less
than 2,6 m.
It is possible that these requirements are not suitable when testing in accordance with EN 25136. In this case
the requirements of EN 25136 shall be followed.
5.3.1.4 Air flow conditions
During the measurements the microphone can be exposed to air velocity. A foam microphone windscreen
shall be used if the air velocity exceeds 2 m/s.
3
For sound test measurements within a room, it is recommended that the ratio between the air flow rate (m /s)
3
and the room volume (m ) does not exceed 1/60.
5.3.2 Specific requirements concerning the set-up of acoustic tests
5.3.2.1 Airborne noise emitted by the casing of the unit
5.3.2.1.1 Test set-up
The measurement of the sound power level emitted by the casing of the unit shall be performed using one of
the test set-ups shown in Figure 2.
Figures 2a) and 2b) show the set-ups for the measurement using a reverberation room. The measurement
shall be performed according to EN ISO 3741.
Figure 2c) shows the set-up for the measurement using the free field method. The measurement shall be
performed according to EN ISO 3744 (accuracy class 2), EN ISO 3746 (accuracy class 3) or EN ISO 9614.
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SIST EN 13053:2001
EN 13053:2001 (E)
a) b)
c)
Figure 2 — Measurement of airborne noise emitted by the casing of the unit
5.3.2.1.2 Noise emitted by the ductwork
The ducts shall be of high transmission loss construction to avoid the sound radiation from the ducting
contributing to the airborne noise measurements Confirmation tests shall be conducted to verify that the
acoustic contribution from the ductwork is insignificant. For example successive layers of a low absorption
acoustical barrier shall be added to the exterior of the ductwork until the resulting sound measurement
indicates no change greater than 1 dB on octave bands from the previous sound measurement in the band
of interest.
5.3.2.1.3 Throttling device
Where a throttling device is necessary for adjusting the unit to the operating point it shall be placed far away
from the casing or outside the room in order to avoid its contribution to the resulting sound power level.
5.3.2.2 Noise transmitted by the unit into the ductwork
5.3.2.2.1 Test set-up
The measurement of the sound power level transmitted by the unit into the ductwork shall be performed
using one of the test set-ups shown in Figure 3.
Figure 3a) shows the set-up for the measurement using a reverberation room. The measurement shall be
performed according to EN ISO 3741. Duct end correction shall be applied in accordance with 5.3.2.2.4.
Figure 3b) shows the set-up for the measurement using the free field method. The measurement shall be
performed according to EN ISO 3744 or EN ISO 9614. Duct end correction shall be applied in accordance
with 5.3.2.2.4.
Figure 3c) shows the set-up for the measurement using anechoic termination. The measurement shall be
performed in accordance with EN 25136.
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SIST EN 13053:2001
EN 13053:2001 (E)
a)
b)
c)
Figure 3 — Measurement of noise transmitted by the unit into the ductwork
5.3.2.2.2 Throttling device
Where a throttling device is necessary for adjusting the unit to the operating point it shall be positioned such
that the sound pressure level generated in the test duct by the throttling device is at least 10 dB below the
sound pressure level in the test duct from the unit.
It is recommended that the throttling device is not positioned in the duct where the measurement is
performed.
5.3.2.2.3 Baffle
When using free field measuring methods (EN ISO 3744, EN ISO 3746, EN ISO 9614) a baffle shall be used
for the simulation of a reflecting plane (see Figure 3 b)). This baffle shall be made of a high density material
with a good refl
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