EN 13053:2019

Ventilation for buildings - Air handling units - Rating and performance for units, components and sections

This document specifies requirements and testing for rating and performance of Non Residential Ventilation Units, NRVU’s, specifically Air Handling Units (AHU’s). It specifies requirements, classifications and testing of components and sections of air handling units.
This document applies to tests in a laboratory and in situ. This document is applicable both for mass produced air handling units and tailor-made Air Handling Units.
This document applies to AHU and individual sections of AHU with the designed air flow > 250 m3 · h−1. This document applies to UVU's with additional air treatment components in addition to filtration.
This standard does not include:
-   residential unidirectional and bidirectional ventilation units;
-   nonresidential unidirectional ventilation units which consist of only a casing, a fan with or without filter.
NOTE 1   Residential ventilation units are covered by EN 13142.
NOTE 2   Nonresidential unidirectional ventilation units which consists only casing, fan with or without filter are covered by EN 17291.

Lüftung von Gebäuden - Zentrale raumlufttechnische Geräte - Leistungskenndaten für Geräte, Komponenten und Baueinheiten

Dieses Dokument legt Anforderungen für Lüftungsgeräte für Nichtwohngebäude, NRVU-Geräte, und insbesondere Luftbehandlungsgeräte (RLT-Geräte) fest und schreibt die Prüfung der Leistungskenndaten vor. Es legt Anforderungen, Klassifizierung und Prüfung für Bauteile und Baueinheiten von Luftbehandlungsgeräten fest.
Dieses Dokument gilt sowohl für Prüfungen in einem Labor als auch für Vor-Ort-Prüfungen. Dieses Dokument ist sowohl für seriengefertigte als auch für maßgefertigte Luftbehandlungsgeräte anwendbar.
Dieses Dokument gilt für RLT-Geräte und einzelne Baueinheiten von RLT-Geräten mit einem Auslegungsvolumenstrom > 250 m3 · h−1. Dieses Dokument gilt für unidirektionale Lüftungsgeräte (UVU) mit die Filtration ergänzenden Luftbehandlungskomponenten.
Diese Norm gilt nicht für
   unidirektionale und bidirektionale Lüftungsgeräte im Wohnbereich;
   unidirektionale Lüftungsgeräte für Nichtwohngebäude, die lediglich aus einem Gehäuse mit Ventilator und einem oder auch keinem Filter bestehen.
ANMERKUNG 1   Lüftungsgeräte für Wohngebäude werden in EN 13142 behandelt.
ANMERKUNG 2   Unidirektionale Lüftungsgeräte für Nichtwohngebäude, die lediglich aus einem Gehäuse mit Ventilator und einem oder auch keinem Filter bestehen, werden in EN 17291 behandelt.

Ventilation des bâtiments - Centrales de traitement d'air - Classification et performance des unités, composants et sections

Le présent document spécifie les prescriptions et les essais pour la classification et la performance des unités de ventilation non résidentielles, NRVU, spécifiquement les centrales de traitement d'air (CTA). Il spécifie les prescriptions, les classifications et l'essai des composants et sections des centrales de traitement d'air.
Le présent document s'applique aux essais en laboratoire et aux essais in situ. Le présent document s'applique aux centrales de traitement d'air fabriquées en série et aux centrales de traitement d'air fabriquées sur mesure.
Le présent document s'applique aux centrales de traitement d'air (CTA) et aux sections individuelles de centrales de traitement d'air (CTA) ayant un débit d'air de dimensionnement > 250 m3h-1. Le présent document s'applique aux UVU avec des composants de traitement d'air supplémentaires en plus de la filtration.
La présente norme n’inclus pas :
-   les unités de ventilation résidentielles unidirectionnelles et bidirectionnelles ;
-   les unités de ventilation unidirectionnelles non résidentielles qui se composent uniquement d'une enveloppe, d'un ventilateur avec ou sans filtre.
NOTE 1   Les unités de ventilation résidentielles sont couvertes par l'EN 13142.
NOTE 2   Les unités de ventilation unidirectionnelles non résidentielles qui se composent uniquement d'une enveloppe, d'un ventilateur avec ou sans filtre sont couvertes par l'EN 17291.

Prezračevanje stavb - Klimatske naprave - Ocenjevanje in lastnosti naprav, sestavnih delov in sklopov

Ta evropski standard določa zahteve in preskuse za ocenjevanje ter lastnosti klimatske naprave kot celote. Prav tako določa zahteve, priporočila, razvrstitev ter preskušanje določenih sestavnih delov in sklopov klimatskih naprav. Pri številnih sestavnih delih in sklopih se navezuje na standarde sestavnih delov, vendar določa tudi omejitve ali uporabo standardov, pripravljenih za samostojne sestavne dele.
Standard se uporablja tako za standardizirane modele, ki so različno veliki, a imajo skupno konstrukcijsko zasnovo, kot tudi za enote, načrtovane po meri. Uporablja se za predizdelane klimatske naprave in tudi za enote, ki so izdelane in vgrajene na izbrani lokaciji. Enote s področja uporabe tega standarda na splošno vključujejo vsaj ventilator, izmenjevalec toplote in zračni filter. Ta standard se ne uporablja za:
a) klimatske naprave, namenjene omejenemu prostoru stavbe, na primer enote ventilatorskih tuljav;
b) enote za stanovanjske stavbe;
c) enote, ki prezračujejo prostor predvsem za namene proizvodnega procesa.

General Information

• Status: Published
• Publication Date: 10-Dec-2019
• Withdrawal Date: 29-Jun-2020
• ICS: 91.140.30 - Ventilation and air-conditioning systems
• Technical Committee: CEN/TC 156 - Ventilation for buildings
• Drafting Committee: CEN/TC 156/WG 5 - Air handling units
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 11-Dec-2019
• Due Date: 12-Sep-2019
• Completion Date: 11-Dec-2019
• Directive: 1253/2014 - Commission Regulation (EU) No 1253/2014 of 7 July 2014 implementing Directive 2009/125/EC of the European Parliament and of the Council with regard to ecodesign requirements for ventilation units
• Directive: 1254/2014 - Commission Delegated Regulation (EU) No 1254/2014 of 11 July 2014 supplementing Directive 2010/30/EU of the European Parliament and of the Council with regard to energy labelling of residential ventilation units
• Mandate: M/495 - Standardisation mandate to CEN, CENELEC and ETSI under Directive 2009/125/EC relating to harmonised standards in the field of Ecodesign
• Mandate: M/537 - [C2015)8325] Standardisation request to the European Committee for Standardisation as regards ventilation units in support of Regulation (EU) No 1253/2014 and Delegated Regulation (EU) No 1254/2014
• Ref Project: SIST EN 13053:2020 - Ventilation for buildings - Air handling units - Rating and performance for units, components and sections

Relations

• Replaces: EN 13053:2006+A1:2011 - Ventilation for buildings - Air handling units - Rating and performance for units, components and sections
• Effective Date: 18-Dec-2019

Overview

EN 13053:2019 - "Ventilation for buildings - Air handling units - Rating and performance for units, components and sections" is the European standard that defines how to rate, test and classify non‑residential ventilation units (NRVUs), specifically air handling units (AHUs). It covers laboratory and in‑situ testing for both mass‑produced and tailor‑made AHUs and applies to whole units and individual sections with a designed airflow greater than 250 m3·h−1. The standard also covers units with additional air‑treatment components beyond filtration and has been aligned with relevant Ecodesign requirements (Commission Regulation (EU) No 1253/2014).

Key technical topics and requirements

EN 13053:2019 sets out standard methods, classifications and test procedures for AHUs and their sections, including:

• Aerodynamic performance: testing methods, characteristics and measurement procedures for airflow and pressure loss.
• Acoustic performance: specific setup and measurement requirements for sound emission testing.
• Internal specific fan power (SFP): measurement of fan power and related uncertainties for ventilation components.
• Components and sections: criteria and tests for casings, fan sections, coils, heat‑recovery units, dampers, mixing sections, humidifiers, filters and passive sound attenuation.
• Heat recovery and defrosting: annexed procedures for heat‑recovery performance and defrosting tests.
• Hygiene and construction: extended hygiene requirements (accessibility, smoothness, drainage, inspection windows) for special applications.
• Installation, operation and maintenance: required documentation, labelling and practical instructions to support correct operation and servicing.
• Field and laboratory testing: applicability to both controlled lab rigs and on‑site verification; tolerances and test reporting formats are specified.

Practical applications and who uses it

EN 13053:2019 is intended for professionals involved in the design, manufacture, testing, procurement and operation of ventilation systems:

• AHU manufacturers - to rate and declare product performance, ensure compliance and optimize designs.
• HVAC designers and consultants - to specify units and components using standardized performance data.
• Testing laboratories and certification bodies - to carry out repeatable aerodynamic, acoustic and energy tests.
• Contractors and facility managers - for commissioning, in‑situ verification and maintenance documentation.
• Procurement and regulatory authorities - to evaluate bids and confirm compliance with Ecodesign and national regulations.

Keywords: EN 13053:2019, ventilation standards, air handling units, AHU rating, AHU performance testing, NRVU, HVAC standards, Ecodesign.

Related standards and compliance

• Residential ventilation units: EN 13142 (not covered by EN 13053).
• Simple non‑residential unidirectional units (casing + fan ± filter): EN 17291.
• Supports compliance with Commission Regulation (EU) No 1253/2014 (Ecodesign requirements for ventilation units).

Standards Content (Sample)

SLOVENSKI STANDARD
01-februar-2020
Nadomešča:
SIST EN 13053:2007+A1:2011
Prezračevanje stavb - Klimatske naprave - Ocenjevanje in lastnosti naprav,
sestavnih delov in sklopov
Ventilation for buildings - Air handling units - Rating 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
des unités, composants et sections
Ta slovenski standard je istoveten z: EN 13053:2019
ICS:
91.140.30 Prezračevalni in klimatski Ventilation and air-
sistemi conditioning systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 13053
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2019
EUROPÄISCHE NORM
ICS 91.140.30 Supersedes EN 13053:2006+A1:2011
English Version
Ventilation for buildings - Air handling units - Rating and
performance for units, components and sections
Ventilation des bâtiments - Centrales de traitement Lüftung von Gebäuden - Zentrale raumlufttechnische
d'air - Classification et performance des unités, Geräte - Leistungskenndaten für Geräte, Komponenten
composants et sections und Baueinheiten
This European Standard was approved by CEN on 28 September 2018.

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 CEN-CENELEC 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 CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13053:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 5
Introduction . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 9
4 Symbols and abbreviations . 12
5 Ratings and performance of the entire air handling unit . 15
5.1 General . 15
5.2 Testing of aerodynamic performance . 15
5.2.1 Test method . 15
5.2.2 Characteristics and quantities. 16
5.2.3 Measurement procedure . 18
5.3 Testing of acoustic performance . 20
5.3.1 General . 20
5.3.2 Specific requirements concerning the set-up of acoustic tests . 21
5.4 Testing of internal specific fan power of ventilation components . 25
5.4.1 General . 25
5.4.2 Test method . 28
5.4.3 Measurement uncertainties . 33
5.5 Tolerances . 34
5.6 Test report . 35
6 Ratings and performance of components and sections . 38
6.1 General . 38
6.2 Casing . 38
6.3 Fan section . 41
6.3.1 General . 41
6.3.2 Power input of fans . 42
6.4 Coils . 42
6.4.1 General . 42
6.4.2 Testing . 43
6.4.3 Construction . 43
6.4.4 Cooler/Droplet eliminator. 43
6.5 Heat recovery sections . 44
6.5.1 General . 44
6.5.2 Classifications and requirements . 44
6.5.3 Testing . 46
6.5.4 Construction . 46
6.6 Damper sections . 47
6.6.1 General . 47
6.6.2 Requirements and testing . 47
6.7 Mixing sections . 47
6.7.1 General . 47
6.7.2 Categories and characteristics . 47
6.7.3 Requirements . 48
6.7.4 Measurements . 50
6.7.5 Field testing of mixing efficiency . 51
6.7.6 Condition for pressure loss measurement of ventilation component due to mixing . 51
6.8 Humidifiers . 51
6.8.1 General . 51
6.8.2 Categories . 52
6.8.3 Requirements . 52
6.9 Filter sections . 55
6.9.1 General requirements . 55
6.9.2 Filters installed in air handling units . 55
6.10 Passive sound attenuation sections . 56
7 Extended hygiene requirements for special applications . 56
7.1 General . 56
7.2 Accessibility . 56
7.3 Smoothness . 57
7.4 Inspection windows and lights . 57
7.5 Drainage/prevention of condensation, humidifiers . 57
7.6 Air leakage . 57
8 Instructions for installation, operation and maintenance . 57
8.1 Installation . 57
8.2 Operation and maintenance . 58
8.3 Documentation and labelling . 58
Annex A (informative) Air handling units - Heat recovery – Defrosting - Requirements and
testing . 59
A.1 General . 59
A.2 Defrosting . 59
A.2.1 Defrosting heat factor . 59
A.2.2 Non-cyclic defrosting . 59
A.2.3 Cyclic defrosting . 59
A.3 Testing . 60
A.3.1 Test rig . 60
A.3.2 Duty points . 60
A.3.3 Test procedures . 61
A.3.4 Testing of defrosting heat factor . 61
A.3.5 Total measuring time . 61
A.4 Test report . 61
A.4.1 Heat recovery device . 61
A.4.2 Defrosting heat factor . 61
Annex B (informative) Air handling units – Heat recovery – Characteristics . 63
B.1 Efficiency of the heat recovery . 63
B.2 Evaluation . 65
B.3 Evaluation of auxiliary energies. 65
B.4 Further characteristics . 66
B.5 Efficiency . 66
B.6 View of yearly energy . 66
Annex C (informative) Static pressure measurement . 68
C.1 Pressure measurement inside a unit . 68
C.2 Pressure measurements in duct-connections outside the unit . 69
Annex ZA (informative) Relationship between this European Standard and the ecodesign
requirements of Commission Regulation (EU) No 1253/2014 aimed to be covered . 70
Bibliography . 72

European foreword
This document (EN 13053:2019) 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 June 2020, and conflicting national standards shall be
withdrawn at the latest by June 2020.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 13053:2006+A1:2011.
This document has been prepared under a standardization request given to CEN by the European
Commission and the European Free Trade Association, and supports essential requirements of
EU Directive.
For relationship with EU Directive, see informative Annex ZA, which is an integral part of this
document.
This document has been revised and includes new requirements according to Ecodesign requirements
for ventilation units given in EU Commission Regulation No 1253/2014.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Introduction
This European Standard is a part of a suite 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. The position of this standard in the field of mechanical
building services is shown in Figure 1.

Figure 1 — Position of this standard in the field of mechanical building services
1 Scope
This document specifies requirements and testing for rating and performance of Non Residential
Ventilation Units, NRVU’s, specifically Air Handling Units (AHU’s). It specifies requirements,
classifications and testing of components and sections of air handling units.
This document applies to tests in a laboratory and in situ. This document is applicable both for mass
produced air handling units and tailor-made Air Handling Units.
3 −1
This document applies to AHU and individual sections of AHU with the designed air flow > 250 m · h .
This document applies to UVU's with additional air treatment components in addition to filtration.
This standard does not include:
— residential unidirectional and bidirectional ventilation units;
— nonresidential unidirectional ventilation units which consist of only a casing, a fan with or without
filter.
NOTE 1 Residential ventilation units are covered by EN 13142.
NOTE 2 Nonresidential unidirectional ventilation units which consists only casing, fan with or without filter are
covered by EN 17291.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 308, Heat exchangers — Test procedures for establishing performance of air to air and flue gases heat
recovery devices
EN 1216, Heat exchangers — Forced circulation air-cooling and air-heating coils — Test procedures for
establishing the performance
EN 1751, Ventilation for buildings — Air terminal devices — Aerodynamic testing of damper and valves
EN 1886, Ventilation for buildings — Air handling units — Mechanical performance
EN 12599:2012, Ventilation for buildings — Test procedures and measurement methods to hand over air
conditioning and ventilation systems
EN 12792:2003, Ventilation for buildings — Symbols, terminology and graphical symbols
EN 16211, Ventilation for buildings. Measurement of air flows on site. Methods
EN ISO 3741, Acoustics — Determination of sound power levels and sound energy levels of noise sources
using sound pressure — Precision methods for reverberation test rooms (ISO 3741)
EN ISO 3743-1, Acoustics — Determination of sound power levels and sound energy levels of noise sources
using sound pressure — Engineering methods for small movable sources in reverberant fields — Part 1:
Comparison method for a hard-walled test room (ISO 3743-1)
EN ISO 3744, Acoustics — Determination of sound power levels and sound energy levels of noise sources
using sound pressure — Engineering methods for an essentially free field over a reflecting plane
(ISO 3744)
EN ISO 3746, Acoustics — Determination of sound power levels and sound energy levels of noise sources
using sound pressure — Survey method using an enveloping measurement surface over a reflecting plane
(ISO 3746)
EN ISO 5136, Acoustics — Determination of sound power radiated into a duct by fans and other air-
moving devices — In-duct method (ISO 5136)
EN ISO 5167-1, Measurement of fluid flow by means of pressure differential devices inserted in circular
cross-section conduits running full — Part 1: General principles and requirements (ISO 5167-1)
EN ISO 5801, Industrial fans — Performance testing using standardized airways (ISO 5801)
EN ISO 7235, Acoustics — Laboratory measurement procedures for ducted silencers and airterminal units
— Insertion loss, flow noise and total pressure loss (ISO 7235)
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)
EN ISO 9614-2, Acoustics — Determination of sound power levels of noise sources using sound intensity —
Part 2: Measurement by scanning (ISO 9614-2)
EN ISO 9614-3, Acoustics — Determination of sound power levels of noise sources using sound intensity —
Part 3: Precision method for measurement by scanning (ISO 9614-3)
EN ISO 16890-1, Air filters for general ventilation — Part 1: Technical specifications, requirements and
classification system based upon particulate matter efficiency (ePM) (ISO 16890-1)
EN ISO 16890-2, Air filters for general ventilation — Part 2: Measurement of fractional efficiency and air
flow resistance (ISO 16890-2)
EN ISO 16890-3, Air filters for general ventilation — Part 3: Determination of the gravimetric efficiency
and the air flow resistance versus the mass of test dust captured (ISO 16890-3)
EN ISO 16890-4, Air filters for general ventilation — Part 4: Conditioning method to determine the
minimum fractional test efficiency (ISO 16890-4)
ISO 3966, Measurement of fluid flow in closed conduits — Velocity area method using Pitot static tubes
ISO 13347-1, Industrial fans — Determination of fan sound power levels under standardized laboratory
conditions - Part 1: General overview
ISO 13347-2, Industrial fans — Determination of fan sound power levels under standardized laboratory
conditions - Part 2: Reverberant room method
ISO 13347-3, Industrial fans — Determination of fan sound power levels under standardized laboratory
conditions - Part 3: Enveloping surface methods
ISO 13347-4, Industrial fans — Determination of fan sound power levels under standardized laboratory
conditions - Part 4: Sound intensity method
ISO 16956, Thermal performance in the built environment — Determination of air flow rate in building
applications by field measuring methods
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 12792:2003 and the following
apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1
air handling unit
factory made unit encased assembly containing a fan or fans, filtrating device(s) and other necessary
equipment to perform at least one or more of the following functions: heating, cooling, heat recovery,
heat transfer, humidifying, dehumidifying and mixing air
3.2
section
< air handling unit > functional element of an air handling unit consisting of one or more components in
a single casing
3.3
component
< air handling unit > smallest functional element of an air handling unit
3.4
casing
< air handling unit > enclosure of the unit, within which the components are mounted
3.5
damper section
section of air handling unit including a damper or valve
3.6
mixing section
section where e.g. outdoor air flow and the recirculation air flow are mixed in a controlled way
Note 1 to entry: The section generally consists of one damper per air flow and a mixing chamber
3.7
filter section
section including a filter or filters and an associated filterframe
3.8
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
3.9
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)
3.10
sound attenuation section
section in which sound transfer into a ductwork or into ambient air is reduced
3.11
humidifier section
section in which moisture is added to the air
3.12
fan section
section in which one or more fans are installed for moving air
3.13
functions
3.13.1
air treatment
process by which the state of the air is modified with respect to one or more of its characteristics such
as temperature, moisture content, dust content, bacterial count, gas and vapour content
3.13.2
cooling
removal of latent and/or sensible heat
3.13.3
dehumidification
controlled reduction of water vapour from the air
3.13.4
filtration
removal of particulate material from the airstream
3.13.5
heating
transfer of heat from one body or medium to another medium
3.13.6
humidification
controlled addition of water vapour to an air stream or space
3.13.7
sound attenuation
controlled reduction of sound energy
3.14
characteristics
3.14.1
air flow
movement of air within set boundaries (such as ducts)
3.14.2
air flow rate
volume flow of air passing a given plane divided by time
3.14.3
bypass leakage
unwanted and uncontrolled passing of untreated air into the treated air between the components
within a casing, such as filters and coils
3.14.4
defrosting heat factor
ratio between the energy transferred into the air supply and the maximum recoverable energy in
exhaust air, excluding the energy input for defrosting
3.14.5
unit pressure, p
u
difference between the total pressure at the outlet of the air handling unit and the total pressure at the
inlet
3.14.6
unit static pressure p
us
difference between the static pressure at the outlet of the air handling unit and the total pressure at the
inlet
3.14.7
external static pressure difference, Δps,ext
difference between the static pressure at the outlet of the air handling unit and the static pressure at the
inlet
3.14.8
humidification efficiency
ratio between the mass of water evaporated by the humidifier and the theoretical mass needed to
achieve saturation at a given temperature
3.15
mass produced air handling unit
air handling units manufactured to the same design and by the same manufacturing process, with a
range of performance characteristics for which the duty point is not defined
Note 1 to entry: Mass produced air handling units (AHUs) are designed for an undefined duty point and mostly
produced in large quantities. Their capacity is generally given in ranges so that they can be used in different
buildings and/or applications.
3.16
tailor made air handling unit
air handling unit individually designed and manufactured for a specific duty point, with defined and
known parameters, designed on a specific order and for a specific purpose
3.17
nominal external pressure
declared design external static pressure difference at nominal air flow
3.18
internal pressure difference of ventilation components, Δp
s,int
sum of the static pressure differences of a reference configuration of a BVU or an UVU at nominal air
flow
3.19
internal pressure difference of additional non-ventilation components, Δp
s,add
remainder of the sum of all internal static pressure differences at nominal air flow after subtraction of
the internal pressure difference of ventilation components (Δps,int)
3.20
internal specific fan power of ventilation components SFP
int
ratio between the internal pressure difference of ventilation components and the fan efficiency,
determined for the reference configuration
3.21
nominal duty point
point at declared design flow rate of an air handling unit at standard air conditions and at declared
external pressure which is used to assess SFP and thermal efficiency
int
3.22
nominal air flow
declared flow rate at the nominal duty point
3.23
reference configuration of a NRVU-BVU
product configured with a casing, at least two fans with variable speed or multi-speed drives, a HRS, a
clean fine filter (minimum ISO ePM1 50%) on the supply air side and a clean medium filter (minimum
ISO ePM10 50%) on the exhaust air side
3.24
reference configuration of a NRVU-UVU supply air
product configured with a casing and at least one fan with variable speed or multi-speed drive, and in
case the product is intended to be equipped with a filter, this filter shall be a clean fine filter (minimum
ISO ePM1 50%)
3.25
reference configuration of a NRVU-UVU exhaust air
product configured with a casing and at least one fan with variable speed or multi-speed drive, and in
case the product is equipped with a filter, no filter class is specified
4 Symbols and abbreviations
For the purposes of this standard, symbols and units given in EN 12792:2003 and in Table 1 apply
together with those defined by the formulas, text and annexes of this standard.
Table 1 — Symbols, terms, units and subscripts
Symbol Term Unit
−1
c Sound velocity in the air m · s
E Duct end correction value dB
f Frequency Hz
h Enthalpy
n Number of measurements within the total measuring time -
L Sound pressure level dB
p
L Sound power level dB
W
LWA A-weighted sound power level dB(A)
−1
n Rotational speed of the fan s
fan
P Electrical motor input power, including any speed control W
el
P Auxiliary electric power input (e.g. pumps) W
el,aux
Electrical power consumption due to internal pressure W
P
el,int
differences of ventilation components
Pm Reference power input W
ref
p Atmospheric pressure Pa
a
p Dynamic pressure Pa
d
p Static pressure Pa
s
p Total pressure Pa
t
p Unit pressure Pa
u
p Unit static pressure Pa
us
−1
q Mass flow of water drain and overflow kg · s
d
−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 m · s
vs
−1
q Mass flow of water inlet kg · s
w
S Section area m
−3
SFP Specific Fan Power, internal W · m · s
int
u Uncertainty range of measured data %
U range of uniformity of flow
−1
v Velocity of air at a point m · s
−1
x Absolute humidity g · kg
Δp External static pressure difference Pa
s,ext
Δp Static pressure difference of the fan Pa
s,fan
Δp Internal pressure difference of ventilation components Pa
s,int
(reference configuration)
ε Coefficient of performance -
ε Defrosting heat factor -
D
η Average overall static efficiency of power consumption -
D
η Energy efficiency -
e
η Yearly energy efficiency -
ea
η Overall static efficiency including motor and drive -
fs,fan
efficiency of the individual fan(s) in the ventilation unit
determined at an air flow and an external pressure
η Humidifier efficiency -
h
η Mixing efficiency %
mix
η Temperature efficiency
t
−3
ρ Density kg · m
−3
ρ Standard air density kg · m
st
φ Relative humidity %
Ω Solid angle of radiation at the end of the duct rad
Subscripts
1 Inlet
2 Outlet
add Related to additional pressure difference of non-ventilation components
cas Related to AHU casing
corr Corrected value
EHA Related to exhaust air
ETA Related to extract air
el Related to electric input
ext External
fan Related to the fan
F Related to clean filter
HRS Heat Recovery System
int Internal
H Air flow with higher temperature
L Air flow with lower temperature
M Mixed air flow [mean temperature]
meas Measured value
max Maximum value
min Minimum value
s Related to static pressure
s,ext Related to external static pressure difference of the unit
s,free,fan Related to static pressure of the stand-alone fan
SUP Related to supply air
TE Related to test conditions
tot Air flow downstream of the mixing section
u Related to the air handling unit (not to the fan)
Abbreviations
AHU Air Handling Unit
HVAC Heating, ventilation and air conditioning
HRS Heat Recovery System
BVU Bidirectional Ventilation Unit
UVU Unidirectional Ventilation Unit
NRVU Non Residential Ventilation Unit

5 Ratings and performance of the entire air handling unit
5.1 General
The performance of the entire air handling unit cannot be defined as the sum of the individual
components and sections. Hence, the procedures that follow shall be applied to a complete air handling
unit. In particular cases, under agreed circumstances, and in order to define the value of SFP , these
int
procedures can be applied to a part of an air handling unit.
The methods described in 5.2 cover among other things measuring air volume flow together with
pressures and power consumption. By selecting an appropriate test system, these procedures can be
extended to include measuring the 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 Test method
5.2.1.1 Basis of method
Tests shall be carried out in accordance with one of the methods shown in EN ISO 5801. The most
suitable test installation type B, C or D shall be adopted considering the on-site or intended installation,
the geometry of the air-handling unit and the facilities available.
The three installation types are as follows:
a) installation Type B: free inlet, ducted outlet;
b) installation Type C: ducted inlet, free outlet and
c) 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 air enters or leaves the air handling unit directly from or to the
unobstructed free atmosphere. Ducted inlet or outlet signifies that air enters or leaves the unit through
a duct directly connected to the unit inlet or outlet.
5.2.1.2 Chamber test method
Where a standardized test chamber is used, it shall conform to the requirements of EN ISO 5801.
5.2.1.3 Ducted test method
The common parts of a ducted system, for Types B, C or D installations, shall conform to the
requirements of EN ISO 5801. 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.
5.2.2 Characteristics and quantities
5.2.2.1 Characteristics
a) Air flow rate/pressure performance
For air handling units installed or intended to be installed in accordance with installation category
B and D: Relationship between unit pressure p (as relevant design pressure parameter) and air
u
volume flow rate q .
v
For air handling units installed or intended to be installed in accordance with installation category
C: Relationship between unit static pressure p (as relevant design pressure parameter) and air
us
volume flow rate q .
v
b) Electrical power
Relationship between electrical input power and air volume flow rate.
If a speed adjustment device is included, e.g. frequency inverter, the electrical motor input power
shall include the power of speed control devices.
These characteristics shall be converted from the ambient temperature and pressure measured at the
−3
time of the test, to standard conditions with an air density of 1,2 kg × m . These characteristics shall be
presented for a stated nominal fan speed but without adjustment for inherent speed deviation during
the test.
5.2.2.2 Quantities
a) Air volume flow rate (q ) shall be measured by any method which is in accordance with
v
EN ISO 5801, ISO 16956, EN 12599, EN 16211, EN ISO 5167-1 or ISO 3966, e.g. a nozzle, an orifice
plate or a pitot-static tube.
b) Unit pressure (p ) and Unit static pressure (p ) shall be determined from the pressure
u us
measurements defined in 5.2.3.2. The dynamic pressure as part of the total pressure is related to
the respective measurement plane. The duct sizes shall be the sizes defined by the manufacturer.
NOTE The simplified calculation method for units supplying a pressure lower than 2000 Pa with a Mach
number of less than 0,15 according to ISO 5801 can be applied.
Unit pressure p :
u
p= p− p= p− p+ p− p (1)
u t2 t1 s2 s1 d2 d1
Unit static pressure p :
us
(2)
p= pp− = p− p− p
us s2 t1 s2 s1 d1
where
p is the sum of the static pressure and the dynamic pressure at unit outlet, expressed in Pa;
t2
p is the static pressure at unit outlet, expressed in Pa.
s2
p is the dynamic pressure at unit outlet, expressed in Pa.
d2
p is the sum of the static pressure and the dynamic pressure at unit inlet, expressed in Pa.
t1
p is the static pressure at unit inlet, expressed in Pa.
s1
p is the dynamic pressure at unit inlet, expressed in Pa.
d1
−3
c) Density of air (ρ) shall be given in kg · m , by using Formula (3) according to EN ISO 5801:
p − 0,378p
a v
(3)
ρ=
287 273+ t
( )
a
where
p is the atmospheric pressure, expressed in Pa;
a
p is the partial pressure of water vapour in the air, expressed in Pa;
v
−1 −1
287 is the gas constant of dry air, expressed in J · kg · K ;
t is the dry-bulb temperature, expressed in °C.
a
d) Temperature of the air (t ) shall be measured at the point of flow measurement.
a
e) Rotational speed of the fan (n ) shall be measured at each test point.
fan
f) Electrical motor input power (P ), the power to the fan motor, shall be measured at each test point.
el
The applied voltage and the current to each phase shall also be recorded when measured.
g) Static pressure difference of the fan Δp , expressed in Pa, shall be determined at nominal duty
s,fan
point.
5.2.2.3 Determination of external static pressure difference Δp
s,ext
The relevant external pressure size to be considered in the determination of the eco-design parameters
SFP and fan efficiency is the external static pressure difference Δp . It can be measured either directly
int s,ext
considering measurement requirements described in 5.2.3.2 or it can be derived from the air flow
rate/pressure characteristics.
The correlation between Δp and the air flow rate/pressure characteristics p (unit pressure) and p
s,ext u us
(unit static pressure) of the air handling unit is shown in Figure 2.

Installation type B Installation type C Installation type D

Δp
s,ext
p −p p − p
direct measurement
s2 s1 s2 s1
calculated based on ρ ρ
st 2 st 2
p
pv+⋅ pv+⋅
us
us 1 us 1
unit static pressure p
us 2 2
ρ
st 2 2
ρ
p − ⋅−()vv
st 2
u 2 1
calculated based on —
pv− ⋅
u2 2
unit pressure p
u
Key
ps1 is the static pressure at inlet side (pressure difference against ambient pressure, Pa);
ps2 is the static pressure at outlet side (pressure difference against ambient pressure, Pa);
-3
ρ is the density of 1,2 kg · m corresponding to the air under standard conditions (20 °C, 101 325 Pa);
st
−1
v is the calculated average velocity in the duct at the respective measurement plane (in m · s )
Figure 2 — Determination of external static pressure difference
5.2.3 Measurement procedure
5.2.3.1 Conditions for measurement
5.2.3.1.1 General
Dampers that control the flow of air in the part of the air handling unit 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
(average of the measured initial and defined final pressure loss at designed airflow – see 6.9.2) and dry
coils. If there is no negative influence on the internal pressure of the unit, the average filter pressure
difference shall be simulated by increasing the external total pressure difference of the unit with a value
equal to the difference between rated average and initial filter pressure difference.
To determine the unit performance with a loa
...

SLOVENSKI STANDARD
01-februar-2020
Nadomešča:
SIST EN 13053:2007+A1:2011
Prezračevanje stavb - Klimatske naprave - Ocenjevanje in lastnosti naprav,
sestavnih delov in sekcij/sklopov
Ventilation for buildings - Air handling units - Rating 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
des unités, composants et sections
Ta slovenski standard je istoveten z: EN 13053:2019
ICS:
91.140.30 Prezračevalni in klimatski Ventilation and air-
sistemi conditioning systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 13053
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2019
EUROPÄISCHE NORM
ICS 91.140.30 Supersedes EN 13053:2006+A1:2011
English Version
Ventilation for buildings - Air handling units - Rating and
performance for units, components and sections
Ventilation des bâtiments - Centrales de traitement Lüftung von Gebäuden - Zentrale raumlufttechnische
d'air - Classification et performance des unités, Geräte - Leistungskenndaten für Geräte, Komponenten
composants et sections und Baueinheiten
This European Standard was approved by CEN on 28 September 2018.

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 CEN-CENELEC 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 CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13053:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 5
Introduction . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 9
4 Symbols and abbreviations . 12
5 Ratings and performance of the entire air handling unit . 15
5.1 General . 15
5.2 Testing of aerodynamic performance . 15
5.2.1 Test method . 15
5.2.2 Characteristics and quantities. 16
5.2.3 Measurement procedure . 18
5.3 Testing of acoustic performance . 20
5.3.1 General . 20
5.3.2 Specific requirements concerning the set-up of acoustic tests . 21
5.4 Testing of internal specific fan power of ventilation components . 25
5.4.1 General . 25
5.4.2 Test method . 28
5.4.3 Measurement uncertainties . 33
5.5 Tolerances . 34
5.6 Test report . 35
6 Ratings and performance of components and sections . 38
6.1 General . 38
6.2 Casing . 38
6.3 Fan section . 41
6.3.1 General . 41
6.3.2 Power input of fans . 42
6.4 Coils . 42
6.4.1 General . 42
6.4.2 Testing . 43
6.4.3 Construction . 43
6.4.4 Cooler/Droplet eliminator. 43
6.5 Heat recovery sections . 44
6.5.1 General . 44
6.5.2 Classifications and requirements . 44
6.5.3 Testing . 46
6.5.4 Construction . 46
6.6 Damper sections . 47
6.6.1 General . 47
6.6.2 Requirements and testing . 47
6.7 Mixing sections . 47
6.7.1 General . 47
6.7.2 Categories and characteristics . 47
6.7.3 Requirements . 48
6.7.4 Measurements . 50
6.7.5 Field testing of mixing efficiency . 51
6.7.6 Condition for pressure loss measurement of ventilation component due to mixing . 51
6.8 Humidifiers . 51
6.8.1 General . 51
6.8.2 Categories . 52
6.8.3 Requirements . 52
6.9 Filter sections . 55
6.9.1 General requirements . 55
6.9.2 Filters installed in air handling units . 55
6.10 Passive sound attenuation sections . 56
7 Extended hygiene requirements for special applications . 56
7.1 General . 56
7.2 Accessibility . 56
7.3 Smoothness . 57
7.4 Inspection windows and lights . 57
7.5 Drainage/prevention of condensation, humidifiers . 57
7.6 Air leakage . 57
8 Instructions for installation, operation and maintenance . 57
8.1 Installation . 57
8.2 Operation and maintenance . 58
8.3 Documentation and labelling . 58
Annex A (informative) Air handling units - Heat recovery – Defrosting - Requirements and
testing . 59
A.1 General . 59
A.2 Defrosting . 59
A.2.1 Defrosting heat factor . 59
A.2.2 Non-cyclic defrosting . 59
A.2.3 Cyclic defrosting . 59
A.3 Testing . 60
A.3.1 Test rig . 60
A.3.2 Duty points . 60
A.3.3 Test procedures . 61
A.3.4 Testing of defrosting heat factor . 61
A.3.5 Total measuring time . 61
A.4 Test report . 61
A.4.1 Heat recovery device . 61
A.4.2 Defrosting heat factor . 61
Annex B (informative) Air handling units – Heat recovery – Characteristics . 63
B.1 Efficiency of the heat recovery . 63
B.2 Evaluation . 65
B.3 Evaluation of auxiliary energies. 65
B.4 Further characteristics . 66
B.5 Efficiency . 66
B.6 View of yearly energy . 66
Annex C (informative) Static pressure measurement . 68
C.1 Pressure measurement inside a unit . 68
C.2 Pressure measurements in duct-connections outside the unit . 69
Annex ZA (informative) Relationship between this European Standard and the ecodesign
requirements of Commission Regulation (EU) No 1253/2014 aimed to be covered . 70
Bibliography . 72

European foreword
This document (EN 13053:2019) 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 June 2020, and conflicting national standards shall be
withdrawn at the latest by June 2020.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 13053:2006+A1:2011.
This document has been prepared under a standardization request given to CEN by the European
Commission and the European Free Trade Association, and supports essential requirements of
EU Directive.
For relationship with EU Directive, see informative Annex ZA, which is an integral part of this
document.
This document has been revised and includes new requirements according to Ecodesign requirements
for ventilation units given in EU Commission Regulation No 1253/2014.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Introduction
This European Standard is a part of a suite 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. The position of this standard in the field of mechanical
building services is shown in Figure 1.

Figure 1 — Position of this standard in the field of mechanical building services
1 Scope
This document specifies requirements and testing for rating and performance of Non Residential
Ventilation Units, NRVU’s, specifically Air Handling Units (AHU’s). It specifies requirements,
classifications and testing of components and sections of air handling units.
This document applies to tests in a laboratory and in situ. This document is applicable both for mass
produced air handling units and tailor-made Air Handling Units.
3 −1
This document applies to AHU and individual sections of AHU with the designed air flow > 250 m · h .
This document applies to UVU's with additional air treatment components in addition to filtration.
This standard does not include:
— residential unidirectional and bidirectional ventilation units;
— nonresidential unidirectional ventilation units which consist of only a casing, a fan with or without
filter.
NOTE 1 Residential ventilation units are covered by EN 13142.
NOTE 2 Nonresidential unidirectional ventilation units which consists only casing, fan with or without filter are
covered by EN 17291.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 308, Heat exchangers — Test procedures for establishing performance of air to air and flue gases heat
recovery devices
EN 1216, Heat exchangers — Forced circulation air-cooling and air-heating coils — Test procedures for
establishing the performance
EN 1751, Ventilation for buildings — Air terminal devices — Aerodynamic testing of damper and valves
EN 1886, Ventilation for buildings — Air handling units — Mechanical performance
EN 12599:2012, Ventilation for buildings — Test procedures and measurement methods to hand over air
conditioning and ventilation systems
EN 12792:2003, Ventilation for buildings — Symbols, terminology and graphical symbols
EN 16211, Ventilation for buildings. Measurement of air flows on site. Methods
EN ISO 3741, Acoustics — Determination of sound power levels and sound energy levels of noise sources
using sound pressure — Precision methods for reverberation test rooms (ISO 3741)
EN ISO 3743-1, Acoustics — Determination of sound power levels and sound energy levels of noise sources
using sound pressure — Engineering methods for small movable sources in reverberant fields — Part 1:
Comparison method for a hard-walled test room (ISO 3743-1)
EN ISO 3744, Acoustics — Determination of sound power levels and sound energy levels of noise sources
using sound pressure — Engineering methods for an essentially free field over a reflecting plane
(ISO 3744)
EN ISO 3746, Acoustics — Determination of sound power levels and sound energy levels of noise sources
using sound pressure — Survey method using an enveloping measurement surface over a reflecting plane
(ISO 3746)
EN ISO 5136, Acoustics — Determination of sound power radiated into a duct by fans and other air-
moving devices — In-duct method (ISO 5136)
EN ISO 5167-1, Measurement of fluid flow by means of pressure differential devices inserted in circular
cross-section conduits running full — Part 1: General principles and requirements (ISO 5167-1)
EN ISO 5801, Industrial fans — Performance testing using standardized airways (ISO 5801)
EN ISO 7235, Acoustics — Laboratory measurement procedures for ducted silencers and airterminal units
— Insertion loss, flow noise and total pressure loss (ISO 7235)
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)
EN ISO 9614-2, Acoustics — Determination of sound power levels of noise sources using sound intensity —
Part 2: Measurement by scanning (ISO 9614-2)
EN ISO 9614-3, Acoustics — Determination of sound power levels of noise sources using sound intensity —
Part 3: Precision method for measurement by scanning (ISO 9614-3)
EN ISO 16890-1, Air filters for general ventilation — Part 1: Technical specifications, requirements and
classification system based upon particulate matter efficiency (ePM) (ISO 16890-1)
EN ISO 16890-2, Air filters for general ventilation — Part 2: Measurement of fractional efficiency and air
flow resistance (ISO 16890-2)
EN ISO 16890-3, Air filters for general ventilation — Part 3: Determination of the gravimetric efficiency
and the air flow resistance versus the mass of test dust captured (ISO 16890-3)
EN ISO 16890-4, Air filters for general ventilation — Part 4: Conditioning method to determine the
minimum fractional test efficiency (ISO 16890-4)
ISO 3966, Measurement of fluid flow in closed conduits — Velocity area method using Pitot static tubes
ISO 13347-1, Industrial fans — Determination of fan sound power levels under standardized laboratory
conditions - Part 1: General overview
ISO 13347-2, Industrial fans — Determination of fan sound power levels under standardized laboratory
conditions - Part 2: Reverberant room method
ISO 13347-3, Industrial fans — Determination of fan sound power levels under standardized laboratory
conditions - Part 3: Enveloping surface methods
ISO 13347-4, Industrial fans — Determination of fan sound power levels under standardized laboratory
conditions - Part 4: Sound intensity method
ISO 16956, Thermal performance in the built environment — Determination of air flow rate in building
applications by field measuring methods
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 12792:2003 and the following
apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1
air handling unit
factory made unit encased assembly containing a fan or fans, filtrating device(s) and other necessary
equipment to perform at least one or more of the following functions: heating, cooling, heat recovery,
heat transfer, humidifying, dehumidifying and mixing air
3.2
section
< air handling unit > functional element of an air handling unit consisting of one or more components in
a single casing
3.3
component
< air handling unit > smallest functional element of an air handling unit
3.4
casing
< air handling unit > enclosure of the unit, within which the components are mounted
3.5
damper section
section of air handling unit including a damper or valve
3.6
mixing section
section where e.g. outdoor air flow and the recirculation air flow are mixed in a controlled way
Note 1 to entry: The section generally consists of one damper per air flow and a mixing chamber
3.7
filter section
section including a filter or filters and an associated filterframe
3.8
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
3.9
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)
3.10
sound attenuation section
section in which sound transfer into a ductwork or into ambient air is reduced
3.11
humidifier section
section in which moisture is added to the air
3.12
fan section
section in which one or more fans are installed for moving air
3.13
functions
3.13.1
air treatment
process by which the state of the air is modified with respect to one or more of its characteristics such
as temperature, moisture content, dust content, bacterial count, gas and vapour content
3.13.2
cooling
removal of latent and/or sensible heat
3.13.3
dehumidification
controlled reduction of water vapour from the air
3.13.4
filtration
removal of particulate material from the airstream
3.13.5
heating
transfer of heat from one body or medium to another medium
3.13.6
humidification
controlled addition of water vapour to an air stream or space
3.13.7
sound attenuation
controlled reduction of sound energy
3.14
characteristics
3.14.1
air flow
movement of air within set boundaries (such as ducts)
3.14.2
air flow rate
volume flow of air passing a given plane divided by time
3.14.3
bypass leakage
unwanted and uncontrolled passing of untreated air into the treated air between the components
within a casing, such as filters and coils
3.14.4
defrosting heat factor
ratio between the energy transferred into the air supply and the maximum recoverable energy in
exhaust air, excluding the energy input for defrosting
3.14.5
unit pressure, p
u
difference between the total pressure at the outlet of the air handling unit and the total pressure at the
inlet
3.14.6
unit static pressure p
us
difference between the static pressure at the outlet of the air handling unit and the total pressure at the
inlet
3.14.7
external static pressure difference, Δps,ext
difference between the static pressure at the outlet of the air handling unit and the static pressure at the
inlet
3.14.8
humidification efficiency
ratio between the mass of water evaporated by the humidifier and the theoretical mass needed to
achieve saturation at a given temperature
3.15
mass produced air handling unit
air handling units manufactured to the same design and by the same manufacturing process, with a
range of performance characteristics for which the duty point is not defined
Note 1 to entry: Mass produced air handling units (AHUs) are designed for an undefined duty point and mostly
produced in large quantities. Their capacity is generally given in ranges so that they can be used in different
buildings and/or applications.
3.16
tailor made air handling unit
air handling unit individually designed and manufactured for a specific duty point, with defined and
known parameters, designed on a specific order and for a specific purpose
3.17
nominal external pressure
declared design external static pressure difference at nominal air flow
3.18
internal pressure difference of ventilation components, Δp
s,int
sum of the static pressure differences of a reference configuration of a BVU or an UVU at nominal air
flow
3.19
internal pressure difference of additional non-ventilation components, Δp
s,add
remainder of the sum of all internal static pressure differences at nominal air flow after subtraction of
the internal pressure difference of ventilation components (Δps,int)
3.20
internal specific fan power of ventilation components SFP
int
ratio between the internal pressure difference of ventilation components and the fan efficiency,
determined for the reference configuration
3.21
nominal duty point
point at declared design flow rate of an air handling unit at standard air conditions and at declared
external pressure which is used to assess SFP and thermal efficiency
int
3.22
nominal air flow
declared flow rate at the nominal duty point
3.23
reference configuration of a NRVU-BVU
product configured with a casing, at least two fans with variable speed or multi-speed drives, a HRS, a
clean fine filter (minimum ISO ePM1 50%) on the supply air side and a clean medium filter (minimum
ISO ePM10 50%) on the exhaust air side
3.24
reference configuration of a NRVU-UVU supply air
product configured with a casing and at least one fan with variable speed or multi-speed drive, and in
case the product is intended to be equipped with a filter, this filter shall be a clean fine filter (minimum
ISO ePM1 50%)
3.25
reference configuration of a NRVU-UVU exhaust air
product configured with a casing and at least one fan with variable speed or multi-speed drive, and in
case the product is equipped with a filter, no filter class is specified
4 Symbols and abbreviations
For the purposes of this standard, symbols and units given in EN 12792:2003 and in Table 1 apply
together with those defined by the formulas, text and annexes of this standard.
Table 1 — Symbols, terms, units and subscripts
Symbol Term Unit
−1
c Sound velocity in the air m · s
E Duct end correction value dB
f Frequency Hz
h Enthalpy
n Number of measurements within the total measuring time -
L Sound pressure level dB
p
L Sound power level dB
W
LWA A-weighted sound power level dB(A)
−1
n Rotational speed of the fan s
fan
P Electrical motor input power, including any speed control W
el
P Auxiliary electric power input (e.g. pumps) W
el,aux
Electrical power consumption due to internal pressure W
P
el,int
differences of ventilation components
Pm Reference power input W
ref
p Atmospheric pressure Pa
a
p Dynamic pressure Pa
d
p Static pressure Pa
s
p Total pressure Pa
t
p Unit pressure Pa
u
p Unit static pressure Pa
us
−1
q Mass flow of water drain and overflow kg · s
d
−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 m · s
vs
−1
q Mass flow of water inlet kg · s
w
S Section area m
−3
SFP Specific Fan Power, internal W · m · s
int
u Uncertainty range of measured data %
U range of uniformity of flow
−1
v Velocity of air at a point m · s
−1
x Absolute humidity g · kg
Δp External static pressure difference Pa
s,ext
Δp Static pressure difference of the fan Pa
s,fan
Δp Internal pressure difference of ventilation components Pa
s,int
(reference configuration)
ε Coefficient of performance -
ε Defrosting heat factor -
D
η Average overall static efficiency of power consumption -
D
η Energy efficiency -
e
η Yearly energy efficiency -
ea
η Overall static efficiency including motor and drive -
fs,fan
efficiency of the individual fan(s) in the ventilation unit
determined at an air flow and an external pressure
η Humidifier efficiency -
h
η Mixing efficiency %
mix
η Temperature efficiency
t
−3
ρ Density kg · m
−3
ρ Standard air density kg · m
st
φ Relative humidity %
Ω Solid angle of radiation at the end of the duct rad
Subscripts
1 Inlet
2 Outlet
add Related to additional pressure difference of non-ventilation components
cas Related to AHU casing
corr Corrected value
EHA Related to exhaust air
ETA Related to extract air
el Related to electric input
ext External
fan Related to the fan
F Related to clean filter
HRS Heat Recovery System
int Internal
H Air flow with higher temperature
L Air flow with lower temperature
M Mixed air flow [mean temperature]
meas Measured value
max Maximum value
min Minimum value
s Related to static pressure
s,ext Related to external static pressure difference of the unit
s,free,fan Related to static pressure of the stand-alone fan
SUP Related to supply air
TE Related to test conditions
tot Air flow downstream of the mixing section
u Related to the air handling unit (not to the fan)
Abbreviations
AHU Air Handling Unit
HVAC Heating, ventilation and air conditioning
HRS Heat Recovery System
BVU Bidirectional Ventilation Unit
UVU Unidirectional Ventilation Unit
NRVU Non Residential Ventilation Unit

5 Ratings and performance of the entire air handling unit
5.1 General
The performance of the entire air handling unit cannot be defined as the sum of the individual
components and sections. Hence, the procedures that follow shall be applied to a complete air handling
unit. In particular cases, under agreed circumstances, and in order to define the value of SFP , these
int
procedures can be applied to a part of an air handling unit.
The methods described in 5.2 cover among other things measuring air volume flow together with
pressures and power consumption. By selecting an appropriate test system, these procedures can be
extended to include measuring the 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 Test method
5.2.1.1 Basis of method
Tests shall be carried out in accordance with one of the methods shown in EN ISO 5801. The most
suitable test installation type B, C or D shall be adopted considering the on-site or intended installation,
the geometry of the air-handling unit and the facilities available.
The three installation types are as follows:
a) installation Type B: free inlet, ducted outlet;
b) installation Type C: ducted inlet, free outlet and
c) 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 air enters or leaves the air handling unit directly from or to the
unobstructed free atmosphere. Ducted inlet or outlet signifies that air enters or leaves the unit through
a duct directly connected to the unit inlet or outlet.
5.2.1.2 Chamber test method
Where a standardized test chamber is used, it shall conform to the requirements of EN ISO 5801.
5.2.1.3 Ducted test method
The common parts of a ducted system, for Types B, C or D installations, shall conform to the
requirements of EN ISO 5801. 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.
5.2.2 Characteristics and quantities
5.2.2.1 Characteristics
a) Air flow rate/pressure performance
For air handling units installed or intended to be installed in accordance with installation category
B and D: Relationship between unit pressure p (as relevant design pressure parameter) and air
u
volume flow rate q .
v
For air handling units installed or intended to be installed in accordance with installation category
C: Relationship between unit static pressure p (as relevant design pressure parameter) and air
us
volume flow rate q .
v
b) Electrical power
Relationship between electrical input power and air volume flow rate.
If a speed adjustment device is included, e.g. frequency inverter, the electrical motor input power
shall include the power of speed control devices.
These characteristics shall be converted from the ambient temperature and pressure measured at the
−3
time of the test, to standard conditions with an air density of 1,2 kg × m . These characteristics shall be
presented for a stated nominal fan speed but without adjustment for inherent speed deviation during
the test.
5.2.2.2 Quantities
a) Air volume flow rate (q ) shall be measured by any method which is in accordance with
v
EN ISO 5801, ISO 16956, EN 12599, EN 16211, EN ISO 5167-1 or ISO 3966, e.g. a nozzle, an orifice
plate or a pitot-static tube.
b) Unit pressure (p ) and Unit static pressure (p ) shall be determined from the pressure
u us
measurements defined in 5.2.3.2. The dynamic pressure as part of the total pressure is related to
the respective measurement plane. The duct sizes shall be the sizes defined by the manufacturer.
NOTE The simplified calculation method for units supplying a pressure lower than 2000 Pa with a Mach
number of less than 0,15 according to ISO 5801 can be applied.
Unit pressure p :
u
p= p− p= p− p+ p− p (1)
u t2 t1 s2 s1 d2 d1
Unit static pressure p :
us
(2)
p= pp− = p− p− p
us s2 t1 s2 s1 d1
where
p is the sum of the static pressure and the dynamic pressure at unit outlet, expressed in Pa;
t2
p is the static pressure at unit outlet, expressed in Pa.
s2
p is the dynamic pressure at unit outlet, expressed in Pa.
d2
p is the sum of the static pressure and the dynamic pressure at unit inlet, expressed in Pa.
t1
p is the static pressure at unit inlet, expressed in Pa.
s1
p is the dynamic pressure at unit inlet, expressed in Pa.
d1
−3
c) Density of air (ρ) shall be given in kg · m , by using Formula (3) according to EN ISO 5801:
p − 0,378p
a v
(3)
ρ=
287 273+ t
( )
a
where
p is the atmospheric pressure, expressed in Pa;
a
p is the partial pressure of water vapour in the air, expressed in Pa;
v
−1 −1
287 is the gas constant of dry air, expressed in J · kg · K ;
t is the dry-bulb temperature, expressed in °C.
a
d) Temperature of the air (t ) shall be measured at the point of flow measurement.
a
e) Rotational speed of the fan (n ) shall be measured at each test point.
fan
f) Electrical motor input power (P ), the power to the fan motor, shall be measured at each test point.
el
The applied voltage and the current to each phase shall also be recorded when measured.
g) Static pressure difference of the fan Δp , expressed in Pa, shall be determined at nominal duty
s,fan
point.
5.2.2.3 Determination of external static pressure difference Δp
s,ext
The relevant external pressure size to be considered in the determination of the eco-design parameters
SFP and fan efficiency is the external static pressure difference Δp . It can be measured either directly
int s,ext
considering measurement requirements described in 5.2.3.2 or it can be derived from the air flow
rate/pressure characteristics.
The correlation between Δp and the air flow rate/pressure characteristics p (unit pressure) and p
s,ext u us
(unit static pressure) of the air handling unit is shown in Figure 2.

Installation type B Installation type C Installation type D

Δp
s,ext
p −p p − p
direct measurement
s2 s1 s2 s1
calculated based on ρ ρ
st 2 st 2
p
pv+⋅ pv+⋅
us
us 1 us 1
unit static pressure p
us 2 2
ρ
st 2 2
ρ
p − ⋅−()vv
st 2
u 2 1
calculated based on —
pv− ⋅
u2 2
unit pressure p
u
Key
ps1 is the static pressure at inlet side (pressure difference against ambient pressure, Pa);
ps2 is the static pressure at outlet side (pressure difference against ambient pressure, Pa);
-3
ρ is the density of 1,2 kg · m corresponding to the air under standard conditions (20 °C, 101 325 Pa);
st
−1
v is the calculated average velocity in the duct at the respective measurement plane (in m · s )
Figure 2 — Determination of external static pressure difference
5.2.3 Measurement procedure
5.2.3.1 Conditions for measurement
5.2.3.1.1 General
Dampers that control the flow of air in the part of the air handling unit 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
(average of the measured initial and defined final pressure loss at designed airflow – see 6.9.2) and dry
coils. If there is no negative influence on the internal pressure of the unit, the average filter pressure
difference shall be simulated by increasing the external total pressure difference of the unit with a value
equal to the difference between rated average and initial filter pressure difference.
To determine the unit performance wit
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