SIST EN 16798-5-2:2018

Energy performance of buildings - Ventilation for buildings - Part 5-2: Calculation methods for energy requirements of ventilation systems (Modules M5-6, M5-8, M6-5, M6-8, M7-5, M7-8) - Method 2: Distribution and generation

This standard covers energy performance calculation of mechanical ventilation systems. It takes into account the generation (air handling unit) and distribution (duct system) parts. It does not cover the emission part (calculation of the required volume flow rates and/or supply air conditions), which is covered in prEN 16798 7 (revised EN 15242).
A calculation method for air conditioning systems, using an hourly calculation time step, is provided in a separate standard prEN 16798-5-1.

Energetische Bewertung von Gebäuden - Lüftung von Gebäuden - Teil 5-2: Berechnungsmethoden für den Energiebedarf von Lüftungssystemen (Module M5-6.2, M5-8.2) - Methode 2: Verteilung und Erzeugung

Diese Europäische Norm behandelt die Berechnung der Energieeffizienz mechanischer Lüftungsanlagen mit integrierter Heizung/Kühlung einschließlich der Brauchwarmwasserbereitung unter Verwendung eines monatlichen oder jahreszeitlichen Berechnungsintervalls oder eines Bin-Verfahrens. Sie berücksichtigt die Teile zur Erzeugung (zentrales raumlufttechnisches Gerät) und zur Verteilung (Luftleitungssystem). Sie behandelt nicht den Teil zur Emission (Berechnung der erforderlichen Luftvolumenströme und/oder Zuluftbedingungen), der durch die Norm M5 5 abgedeckt ist. Sie umfasst weder die Be  noch die Entfeuchtung. Dieses Verfahren konzentriert sich auf kleine, gebündelte Lüftungsanlagen, wie sie gewöhnlich in Wohngebäuden verwendet werden, auch wenn die Anwendung nicht in Hinsicht auf die Art des Gebäudes oder der Raumnutzung eingeschränkt ist.
Ein Berechnungsverfahren für mechanische Lüftungs- und Klimaanlagen, einschließlich Be- und Entfeuchtung, unter Anwendung eines stündlichen Berechnungszeitschritts oder eines Bin-Verfahrens ist in einer separaten Norm, EN 16798 5 1, enthalten.
Tabelle 1 zeigt die relative Position dieser Norm innerhalb des EPB-Normenpakets im Kontext der in EN ISO 52000 1 dargelegten modularen Struktur
ANMERKUNG 1   In CEN ISO/TR 52000 2 ist die gleiche Tabelle zu finden und sie enthält für jedes Modul die Nummern der relevanten EPB-Normen und der zugehörigen technischen Berichte, die veröffentlicht wurden oder in Vorbereitung sind.
ANMERKUNG 2   Die Module stellen EPB-Normen dar, auch wenn eine EPB-Norm mehr als ein Modul abdecken kann und ein Modul von mehr als einer EPB-Norm abgedeckt sein kann, wie es sich zum Beispiel bei einem vereinfachten und einem detaillierteren Verfahren verhält. Siehe auch Abschnitt 2 und Tabellen A.1 und B.1.

Performance énergétique des bâtiments - Ventilation des bâtiments - Partie 5-2 : Méthodes de calcul pour les besoins énergétiques des systèmes de ventilation (Modules M5-6, M5-8, M6-5, M6-8, M7-5, M7-8) - Méthode 2 : Distribution et génération

La présente Norme européenne traite du calcul de la performance énergétique des systèmes de ventilation mécanique avec génération de chaleur/froid intégrée, y compris la production d'eau chaude sanitaire, utilisant un intervalle de calcul mensuel ou saisonnier ou une méthode bin. Elle tient compte des aspects relatifs à la génération (caisson de traitement d'air) et à la distribution (système de conduit). Elle ne traite pas des aspects relatifs aux émissions (calcul des débits volumiques requis et/ou conditions pour l'air fourni), qui sont traités dans la norme M5-5. Elle n'inclut pas l'humidification et la déshumidification. Cette méthode se focalise sur les systèmes de ventilation de petite taille, en kit, généralement utilisés dans les bâtiments résidentiels, bien que son application ne soit pas restreinte en fonction du type de bâtiment ou d'utilisation de l'espace.
Une méthode de calcul pour les systèmes de ventilation mécanique et de conditionnement d'air, y compris l'humidification et la déshumidification, en appliquant un intervalle de calcul horaire ou une méthode bin, est fournie dans une autre norme, l'EN 16798-5-1.
Le Tableau 1 indique la position relative de la présente norme dans l’ensemble de normes PEB dans le cadre de la structure modulaire donnée dans l’EN ISO 52000-1.
NOTE 1   Le même tableau figure dans le CEN ISO/TR 52000-2 avec, pour chaque module, le numéro des normes PEB correspondantes et les rapports techniques associés qui sont publiés ou en cours d'élaboration.
NOTE 2   Les modules représentent des normes PEB, bien qu'une norme PEB puisse couvrir plus d'un module et qu'un module puisse être couvert par plusieurs normes PEB, par exemple une méthode simplifiée et détaillée respectivement. Voir également l'Article 2 et les Tableaux A.1 et B.1.
(...)

Energijske lastnosti stavb - Prezračevanje stavb - 5-2. del: Metode za izračun potrebne energije za sisteme prezračevanja - Moduli M5-6, M5-8, M6-5, M6-8, M7-5, M7-8 - Metoda 2: Distribucija in proizvodnja

Ta standard zajema izračun energetske učinkovitosti mehanskih prezračevalnih sistemov. Upošteva dele za proizvajanje (prezračevalna enota) in porazdelitev (sistem kanalov). Ne zajema pa dela emisij (izračun potrebnega volumenskega pretoka in/ali pogojev dovedenega zraka), ki je zajet v standardu prEN 16798-7 (revidiran standard EN 15242).
Računska metoda z urnim izračunom za klimatske naprave je podana v ločenem standardu prEN 16798-5-1.

General Information

• Status: Published
• Public Enquiry End Date: 01-Jul-2015
• Publication Date: 13-Jun-2018
• ICS: 91.140.30 - Ventilation and air-conditioning systems
• Technical Committee: OGS - Heating for buildings
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 19-Mar-2018
• Due Date: 24-May-2018
• Completion Date: 14-Jun-2018
• Directive: 2010/31/EU - Directive 2010/31/eu of the European Parliament and of the Council of 19 May 2010 on the energy performance of buildings (recast)
• Mandate: M/480 - Mandate to CEN, CENELEC and ETSI for the elaboration and adoption of standards for a methodology calculating the integrated energy performance of buildings and promoting the energy efficiency of buildings, in accordance with the terms set in the recast of the Directive on the energy performance buildings (2010/31/EU)
• Ref Project: EN 16798-5-2:2017 - Energy performance of buildings - Ventilation for buildings - Part 5-2: Calculation methods for energy requirements of ventilation systems (Modules M5-6, M5-8, M6-5, M6-8, M7-5, M7-8) - Method 2: Distribution and generation

Relations

• Replaces: SIST EN 15241:2007/AC:2011 - Ventilation for buildings - Calculation methods for energy losses due to ventilation and infiltration in buildings
• Effective Date: 01-Jul-2018
• Replaces: SIST EN 15241:2007 - Ventilation for buildings - Calculation methods for energy losses due to ventilation and infiltration in buildings
• Effective Date: 01-Jul-2018
• Replaces: SIST EN 15241:2007 - Ventilation for buildings - Calculation methods for energy losses due to ventilation and infiltration in buildings
• Effective Date: 08-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 16798-5-2:2018
01-julij-2018
1DGRPHãþD
SIST EN 15241:2007
SIST EN 15241:2007/AC:2011
(QHUJLMVNHODVWQRVWLVWDYE3UH]UDþHYDQMHVWDYEGHO0HWRGH]DL]UDþXQ
SRWUHEQHHQHUJLMH]DVLVWHPHSUH]UDþHYDQMD0RGXOL00000
00HWRGD'LVWULEXFLMDLQSURL]YRGQMD
Energy performance of buildings - Ventilation for buildings - Part 5-2: Calculation
methods for energy requirements of ventilation systems (Modules M5-6, M5-8, M6-5, M6
-8, M7-5, M7-8) - Method 2: Distribution and generation
Energetische Bewertung von Gebäuden - Lüftung von Gebäuden - Teil 5-2:
Berechnungsmethoden für den Energiebedarf von Lüftungssystemen (Module M5-6.2,
M5-8.2) - Methode 2: Verteilung und Erzeugung
Performance énergétique des bâtiments - Ventilation des bâtiments - Partie 5-2 :
Méthodes de calcul pour les besoins énergétiques des systèmes de ventilation (Modules
M5-6, M5-8, M6-5, M6-8, M7-5, M7-8) - Méthode 2 : Distribution et génération
Ta slovenski standard je istoveten z: EN 16798-5-2:2017
ICS:
91.140.30 3UH]UDþHYDOQLLQNOLPDWVNL Ventilation and air-
VLVWHPL conditioning systems
SIST EN 16798-5-2:2018 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 16798-5-2:2018

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SIST EN 16798-5-2:2018


EN 16798-5-2
EUROPEAN STANDARD

NORME EUROPÉENNE

August 2017
EUROPÄISCHE NORM
ICS 91.120.10; 91.140.30 Supersedes EN 15241:2007
English Version

Energy performance of buildings - Ventilation for buildings
- Part 5-2: Calculation methods for energy requirements of
ventilation systems (Modules M5-6, M5-8, M6-5, M6-8,
M7-5, M7-8) - Method 2: Distribution and generation
Performance énergétique des bâtiments - Ventilation Energieeffizienz von Gebäuden - Modul M5-6.2, M5-8.2
des bâtiments - Partie 5-2 : Méthodes de calcul pour les - Lüftung von Gebäuden - Berechnungsverfahren für
besoins énergétiques des systèmes de ventilation den Energiebedarf von Lüftungssystemen - Teil 5-2:
(Modules M5-6, M5-8, M6-5, M6-8, M7-5, M7-8) - Verteilung und Erzeugung (Revision von EN 15241) -
Méthode 2 : Distribution et génération Methode 2
This European Standard was approved by CEN on 27 February 2017.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, 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: Avenue Marnix 17, B-1000 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 16798-5-2:2017 E
worldwide for CEN national Members.

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SIST EN 16798-5-2:2018
EN 16798-5-2:2017 (E)
Contents Page
European foreword . 4
Introduction . 7
1 Scope . 9
2 Normative references . 12
3 Terms and definitions . 13
4 Symbols, subscripts and abbreviations. 14
4.1 Symbols . 14
4.2 Subscripts . 14
4.3 Abbreviations . 15
5 Brief description of the method — Output of the method . 15
6 Calculation method . 16
6.1 Output data . 16
6.2 Calculation time interval and calculation period . 17
6.2.1 Calculation interval . 17
6.2.2 Calculation period . 18
6.3 Input data . 18
6.3.1 Source of data, general . 18
6.3.2 Product data . 18
6.3.3 System design data . 21
6.3.4 Operating conditions . 22
6.3.5 Constants and physical data . 24
6.3.6 Input data from Annex A (Annex B) . 24
6.4 Calculation procedure . 24
6.4.1 Applicable time intervals . 24
6.4.2 Operating conditions calculation . 24
6.4.3 Energy calculation . 29
7 Quality control . 39
8 Compliance check. 39
Annex A (normative) Input and method selection data sheet — Template . 40
A.1 General . 40
A.2 References . 41
A.3 Input data . 41
A.3.1 Product description data . 41
A.3.2 Product technical data . 42
A.3.3 System design data . 44
Annex B (informative) Input and method selection data sheet — Default choices . 48
B.1 General . 48
B.2 References . 49
2

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B.3 Input data . 49
B.3.1 Product description data . 49
B.3.2 Product technical data . 50
B.3.3 System design data . 52
Bibliography . 56

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SIST EN 16798-5-2:2018
EN 16798-5-2:2017 (E)
European foreword
This document (EN 16798-5-2:2017) 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 February 2018, and conflicting national standards
shall be withdrawn at the latest by February 2018.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
This document supersedes EN 15241:2007.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association.
Regarding the modifications that were made with regard to EN 15241:2007, these are listed in the last
paragraph in the Introduction.
This standard has been produced to meet the requirements of Directive 2010/31/EU 19 May 2010 on
the energy performance of buildings (recast), referred to as “recast EPDB”.
EN 15241:2007 was produced to meet the requirements of Directive 2002/91/EC 16 December 2002
on energy performance of buildings referred to as “EPBD”.
For the convenience of Standards users CEN/TC 156, together with responsible Working Group
Convenors, have prepared a simple table below relating, where appropriate, the relationship between
the ‘EPBD’ and ‘recast EPBD’ standard numbers prepared by Technical Committee CEN/TC 156
“Ventilation for buildings”.
EPBD EN Recast EPBD EN
Title
Number Number
Energy performance of buildings — Part 1: Indoor environmental
input parameters for design and assessment of energy performance
1)
of buildings addressing indoor air quality, thermal environment,
EN 15251
FprEN 16798–1
lighting and acoustics — Module M1–6
(revision of EN 15251)
Energy performance of buildings — Ventilation for buildings —
Part 2: Interpretation of the requirements in EN 16798-1 — Indoor
N/A CEN/TR 16798–2 environmental input parameters for design and assessment of
energy performance of buildings addressing indoor air quality,
thermal environment, lighting and acoustics (Module M1-6)

1) At voting stage by the time the present text is published.
4

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SIST EN 16798-5-2:2018
EN 16798-5-2:2017 (E)
Energy performance of buildings — Ventilation for buildings —
Part 3: For non-residential buildings — Performance requirements
for ventilation and room-conditioning systems (Modules M5-1, M5-
EN 13779 EN 16798–3
4)
(revision of EN 13779)
Energy performance of buildings — Ventilation for buildings —
Part 4: Interpretation of the requirements in EN 16798-3 — For
N/A CEN/TR 16798–4
non-residential buildings — Performance requirements for
ventilation and room-conditioning systems (Modules M5-1, M5-4)
Energy performance of buildings — Ventilation for buildings —
Part 5-1: Calculation methods for energy requirements of
ventilation and air conditioning systems (Modules M5-6, M5-8, M6-
EN 15241 EN 16798–5–1
5, M6-8, M7-5, M7-8) — Method 1: Distribution and generation
(revision of EN 15241)
Energy performance of buildings — Ventilation for buildings —
Part 5-2: Calculation methods for energy requirements of
ventilation systems (Modules M5-6, M5-8, M6-5, M6-8, M7-5, M7-
EN 15241 EN 16798–5–2
8) — Method 2: Distribution and generation
(revision of EN 15241)
Energy performance of buildings — Ventilation for buildings —
Part 6: Interpretation of the requirements in EN 16798-5-1 and
N/A CEN/TR 16798–6 EN 16798-5-2 — Calculation methods for energy requirements of
ventilation and air conditioning systems (Modules M5-6, M5-8, M6-
5, M6-8 , M7-5, M7-8)
Energy performance of buildings — Ventilation for buildings —
Part 7: Calculation methods for the determination of air flow rates
EN 15242 EN 16798–7
in buildings including infiltration (Modules M5-5)
(revision of EN 15242)
Energy performance of buildings — Ventilation for buildings —
Part 8: Interpretation of the requirements in EN 16798-7 —
N/A CEN/TR 16798–8
Calculation methods for the determination of air flow rates in
buildings including infiltration (Module M5-5)
Energy performance of buildings — Ventilation for buildings —
Part 9: Calculation methods for energy requirements of cooling
EN 15243 EN 16798–9
systems (Modules M4-1, M4-4, M4-9) — General
(revision of EN 15243)
Energy performance of buildings — Ventilation for buildings —
Part 10: Interpretation of the requirements in EN 16798-9 —
N/A CEN/TR 16798–10
Calculation methods for energy requirements of cooling systems
(Module M4-1,M4-4, M4-9) — General
Energy performance of buildings — Ventilation for buildings —
Part 13: Calculation of cooling systems (Module M4-8) —
EN 15243 EN 16798–13
Generation
(revision of EN 15243)
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SIST EN 16798-5-2:2018
EN 16798-5-2:2017 (E)
Energy performance of buildings — Ventilation for buildings —
Part 14: Interpretation of the requirements in EN 16798-13 —
EN 15243 CEN/TR 16798–14
Calculation of cooling systems (Module M4-8) — Generation
(revision of EN 15243)
Energy performance of buildings — Ventilation for buildings —
N/A EN 16798–15
Part 15: Calculation of cooling systems (Module M4-7) — Storage
Energy performance of buildings — Ventilation for buildings —
N/A CEN/TR 16798–16 Part 16: Interpretation of the requirements in EN 16798-15 —
Calculation of cooling systems (Module M4-7) — Storage
EN 15239, Energy performance of buildings — Ventilation for buildings —
and EN 16798–17 Part 17: Guidelines for inspection of ventilation and air
EN 15240 conditioning systems (Module M4-11, M5-11, M6-11, M7-11)
Energy performance of buildings — Ventilation for buildings —
Part 18: Interpretation of the requirements in EN 16798-17 —
N/A CEN/TR 16798–18
Guidelines for inspection of ventilation and air-conditioning
systems (Modules M4-11, M5-11, M6-11, M7-11)

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
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SIST EN 16798-5-2:2018
EN 16798-5-2:2017 (E)
Introduction
This European Standard is part of a series of standards aiming at international harmonization of the
methodology for the assessment of the energy performance of buildings, called “set of EPB standards”.
All EPB standards follow specific rules to ensure overall consistency, unambiguity and transparency.
All EPB standards provide a certain flexibility with regard to the methods, the required input data and
references to other EPB standards, by the introduction of a normative template in Annex A and Annex B
with informative default choices.
For the correct use of this standard, a normative template is given in Annex A to specify these choices.
Informative default choices are provided in Annex B.
The main target groups of this standard are all the users of the set of EPB standards (e.g. engineers,
regulators, programmers).
Use by or for regulators: In case the standard is used in the context of national or regional legal
requirements, mandatory choices may be given at national or regional level for such specific
applications. These choices (either the informative default choices from Annex B or choices adapted to
national / regional needs, but in any case following the template of this Annex A) can be made available
as national annex or as separate (e.g. legal) document (national data sheet).
NOTE 1 So in this case:
— the regulators will specify the choices;
— the individual user will apply the standard to assess the energy performance of a building, and thereby use
the choices made by the regulators.
Topics addressed in this standard can be subject to public regulation. Public regulation on the same
topics can override the default values in Annex B of this standard. Public regulation on the same topics
can even, for certain applications, override the use of this standard. Legal requirements and choices are
in general not published in standards but in legal documents. In order to avoid double publications and
difficult updating of double documents, a national annex may refer to the legal texts where national
choices have been made by public authorities. Different national annexes or national data sheets are
possible, for different applications.
It is expected, if the default values, choices and references to other EPB standards in Annex B are not
followed due to national regulations, policy or traditions, that:
— national or regional authorities prepare data sheets containing the choices and national or regional
values, according to the model in Annex A. In this case, the National Annex (e.g. NA) refers to this
text;
— or, by default, the national standards body will consider the possibility to add or include a national
Annex in agreement with the template of Annex A, in accordance to the legal documents that give
national or regional values and choices.
Default references to EPB standards other than EN ISO 52000-1 are identified by the EPB module code
number and given in Table B.1. If alternative references are specified, this should be done in Table NA.1
of a National Annex, which should follow the template given in Table A.1.
NOTE 2 Example of EPB module code number: M5–5, or M5–5.1 (if module M5–5 is subdivided), or M5–5/1 (if
reference to a specific clause of the standard covering M5–5.
NOTE 3 The same module code numbering is bound to be used in other EPB standards. This will facilitate, in an
individual country, the making of a consistent set of national annexes for each EPB standard and contribute to the
overall consistency and transparency.
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SIST EN 16798-5-2:2018
EN 16798-5-2:2017 (E)
Further target groups are parties wanting to motivate their assumptions by classifying the building
energy performance for a dedicated building stock.
More information is provided in the Technical Report accompanying this standard (CEN/TR 16798-6),
including examples aiming to check the quality and usability of the standard.
CEN/TC 156 deals with ventilation and air conditioning systems in buildings. Subjects covered by
CEN/TC 156 are:
1) energy performance calculation for ventilation, air conditioning and cooling systems;
2) inspection of ventilation and air conditioning systems; and
3) installation and commissioning of ventilation and air conditioning systems.
The revision includes changes:
— for a rearrangement of content versus EN 15242:2007, in order to better fit in the modular
structure given in EN ISO 52000-1:2017;
— to cover ventilation systems which is intended for residential buildings (including air heating and
air cooling definition, see the module M5-1 standard);
— for an improved fan energy calculation, taking into consideration control strategies according to
CEN/TC 247 and fan product standards /data;
— for an improved calculation of heat recovery devices, delivering the efficiency and auxiliary energy
depending on control;
— for the consideration of recirculation;
— the formatting according to the new rules set in CEN/TS 16629;
— the consideration of ISO/TC 205 work performed in the meantime.
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SIST EN 16798-5-2:2018
EN 16798-5-2:2017 (E)
1 Scope
This European Standard covers energy performance calculation of mechanical ventilation systems with
integrated heating/cooling generation, including domestic hot water production, using a monthly or
seasonal calculation interval or a bin method. It takes into account the generation (air handling unit)
and distribution (duct system) parts. It does not cover the emission part (calculation of the required
volume flow rates and/or supply air conditions), which is covered in the M5-5 standard. It does not
include humidification and dehumidification. This method is focussed on small, packaged ventilation
systems, typically used in residential buildings, although the application is not restricted on the basis of
building or space use type.
A calculation method for mechanical ventilation and air conditioning systems, including humidification
and dehumidification, using an hourly calculation interval or a bin method, is provided in a separate
standard, EN 16798-5-1.
Table 1 shows the relative position of this standard within the set of EPB standards in the context of the
modular structure as set out in EN ISO 52000-1.
NOTE 1 In CEN ISO/TR 52000-2, the same table can be found, with, for each module, the numbers of the
relevant EPB standards and accompanying technical reports that are published or in preparation.
NOTE 2 The modules represent EPB standards, although one EPB standard might cover more than one module
and one module might be covered by more than one EPB standard, for instance a simplified and a detailed method
respectively. See also Clause 2 and Tables A.1 and B.1.

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Table 1 — Position of this standard (in casu M5–6, M5–8) within the EPB set of standards
  Building
 Overarching Technical Building Systems
(as such)
  Building PV,
Domestic
Submodule Descriptions Descriptions Descriptions Heating Cooling Ventilation Humidification Dehumidification Lighting automation and wind,
Hot water
control …
sub1  M1  M2   M3 M4 M5 M6 M7 M8 M9 M10 M11
1  General  General  General
 Common
terms and
Building
a
2 definitions; Needs
Energy Needs
symbols, units
and subscripts
  (Free) Indoor
Conditions Maximum Load and
3 Applications
without Power
Systems
 Ways to  Ways to
Express Express Ways to Express
4
Energy Energy Energy Performance
Performance Performance
 Building
Heat Transfer
categories and
5 by Emission and control
Building
Transmission
Boundaries

Building Heat Transfer
Occupancy by Infiltration Distribution and
6   EN 16798–5-2
and Operating and control
Conditions Ventilation
 Aggregation of
Energy
Internal Heat
7 Services and Storage and control
Gains
Energy
Carriers
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SIST EN 16798-5-2:2018
EN 16798-5-2:2017 (E)
  Building
 Overarching Technical Building Systems
(as such)
  Building PV,
Domestic
Submodule Descriptions Descriptions Descriptions Heating Cooling Ventilation Humidification Dehumidification Lighting automation and wind,
Hot water
control …
sub1  M1  M2   M3 M4 M5 M6 M7 M8 M9 M10 M11

Building Solar Heat
8 Generation and control   EN 16798–5-2
zoning Gains
  Building
Calculated
Dynamics Load dispatching and
9 Energy
(thermal operating conditions
Performance
mass)
 Measured  Measured
Measured Energy
10 Energy Energy
Performance
Performance Performance
11  Inspection  Inspection  Inspection
 Ways to
Express
12  BMS
Indoor
Comfort
 External
13 Environment
Conditions
 Economic
14
Calculation
a
The shaded modules are not applicable.

11

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SIST EN 16798-5-2:2018
EN 16798-5-2:2017 (E)
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
EN 1507, Ventilation for buildings — Sheet metal air ducts with rectangular section — Requirements for
strength and leakage
EN 12237, Ventilation for buildings — Ductwork — Strength and leakage of circular sheet metal ducts
EN 12792:2003, Ventilation for buildings — Symbols, terminology and graphical symbols
EN 12975-1, Thermal solar systems and components — Solar collectors — Part 1: General requirements
EN 13141-7, Ventilation for buildings — Performance testing of components/products for residential
ventilation — Part 7: Performance testing of a mechanical supply and exhaust ventilation units (including
heat recovery) for mechanical ventilation systems intended for single family dwellings
EN 13141-8, Ventilation for buildings — Performance testing of components/products for residential
ventilation — Part 8: Performance testing of un-ducted mechanical supply and exhaust ventilation units
(including heat recovery) for mechanical ventilation systems intended for a single room
EN 13142, Ventilation for buildings — Components/products for residential ventilation — Required and
optional performance characteristics
EN 14239, Ventilation for buildings — Ductwork — Measurement of ductwork surface area
EN 16147, Heat pumps with electrically driven compressors — Testing, performance rating and
requirements for marking of domestic hot water units
EN 16573, Ventilation for Buildings — Performance testing of components for residential buildings —
Multifunctional balanced ventilation units for single family dwellings, including heat pumps
EN 16798-3:2017, Energy performance of buildings — Ventilation for buildings — Part 3: For non-
residential buildings — Performance requirements for ventilation and room-conditioning systems
(Modules M5-1, M5-4)
EN 16798–5–1:2017, Energy performance of buildings — Ventilation for buildings — Part 5-1:
Calculation methods for energy requirements of ventilation and air conditioning systems (Modules M5-6,
M5-8, M6-5, M6-8, M7-5, M7-8) — Method 1: Distribution and generation
CEN/TR 16798-6, Energy performance of buildings — Ventilation for buildings — Part 6: Interpretation
of the requirements in EN 16798-5-1 and EN 16798-5-2 — Calculation methods for energy requirements of
ventilation and air conditioning systems (Modules M5-6, M5-8, M6-5, M6-8 , M7-5, M7-8)
EN ISO 7345:1995, Thermal insulation — Physical quantities and definitions (ISO 7345:1987)
EN ISO 52000-1:2017, Energy perfor
...

SLOVENSKI STANDARD
oSIST prEN 16798-5-2:2015
01-junij-2015
(QHUJHWVNDXþLQNRYLWRVWVWDYE±0RGXOD0LQ03UH]UDþHYDQMHVWDYE
5DþXQVNHPHWRGH]DHQHUJHWVNH]DKWHYHSUH]UDþHYDOQLKVLVWHPRYGHO
'LVWULEXFLMDLQSURL]YRGQMDUHYL]LMD(10HWRGD
Energy performance of buildings - Modules M5-6, M5-8 - Ventilation for buildings -
Calculation methods for energy requirements of ventilation systems - Part 5-2:
Distribution and generation (revision of EN 15241) - method 2
Energieeffizienz von Gebäuden - Module M5-6, M5-8 - Lüftung von Gebäuden -
Berechnungsmethoden für den Energiebedarf von Lüftungs- und Klimaanlagen - Teil 5-2:
Verteilung und Erzeugung (Revision von EN 15241) - Methode 2
Performance énergétique des bâtiments - Modules M5-6, M5-8 - Ventilation des
bâtiments - Méthodes de calcul pour les besoins énergétiques des systèmes de
ventilation - Partie 5-2 : Distribution et génération (révision de l'EN 15241) - Méthode 2
Ta slovenski standard je istoveten z: prEN 16798-5-2
ICS:
91.140.30 3UH]UDþHYDOQLLQNOLPDWVNL Ventilation and air-
VLVWHPL conditioning
oSIST prEN 16798-5-2:2015 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 16798-5-2:2015

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oSIST prEN 16798-5-2:2015

EUROPEAN STANDARD
DRAFT
prEN 16798-5-2
NORME EUROPÉENNE

EUROPÄISCHE NORM

March 2015
ICS 91.120.10; 91.140.30 Will supersede EN 15241:2007
English Version
Energy performance of buildings - Modules M5-6, M5-8 -
Ventilation for buildings - Calculation methods for energy
requirements of ventilation systems - Part 5-2: Distribution and
generation (revision of EN 15241) - method 2
Performance énergétique des bâtiments - Modules M5-6, Energieeffizienz von Gebäuden - Module M5-6, M5-8 -
M5-8 - Ventilation des bâtiments - Méthodes de calcul pour Lüftung von Gebäuden - Berechnungsmethoden für den
les besoins énergétiques des systèmes de ventilation - Energiebedarf von Lüftungs- und Klimaanlagen - Teil 5-2:
Partie 5-2 : Distribution et génération (révision de l'EN Verteilung und Erzeugung (Revision von EN 15241) -
15241) - Méthode 2 Methode 2
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 156.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.


EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 16798-5-2:2015 E
worldwide for CEN national Members.

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oSIST prEN 16798-5-2:2015
prEN 16798-5-2:2015 (E)
Contents Page
Foreword .3
Introduction .4
1 Scope .5
2 Normative references .6
3 Terms and definitions .6
4 Symbols and abbreviations .8
4.1 Symbols .8
4.2 Subscripts .8
4.3 Abbreviations .9
5 Description of the method.9
5.1 Output of the method .9
5.2 Optional method .9
6 Method . 10
6.1 Output data . 10
6.2 Calculation time steps . 11
6.3 Input data . 11
6.3.1 Source of data . 11
6.3.2 Product data . 11
6.3.3 System design data . 13
6.3.4 Operating conditions . 15
6.3.5 Constants and physical data . 15
6.4 Calculation procedure . 16
6.4.1 Applicable timestep . 16
6.4.2 Operating conditions calculation . 16
6.4.3 Energy calculation . 20
7 Quality control . 27
8 Compliance check . 28
Annex A (normative) Template for input data and choices . 29
A.1 Product description data – Heat pump . 29
A.2 Product technical data . 29
A.3 System design data . 30
Annex B (informative) Default input data . 32
B.1 Product description data . 32
B.2 Product technical data . 32
B.3 System design data . 33
Bibliography . 36

2

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Foreword
This document (prEN 16798-5-2:2015) has been prepared by Technical Committee CEN/TC 156 “Ventilation
for buildings”, the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 15241:2007.
3

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Introduction
This standard is part of a set of standards developed to support EPBD directive implementation, hereafter
called “EPB standards”.
EPB standards deal with energy performance calculation and other related aspects (like system sizing) to
provide the building services considered in the EPBD directive.
TC 156 deals with ventilation and air conditioning systems in buildings. Subjects covered by TC 156 are:
1) energy performance calculation for ventilation, air conditioning and cooling systems;
2) inspection of ventilation and air conditioning systems;
This standard replaces EN 15241, which was developed during the first EPBD mandate and was published in
2007.
The revision for inclusion in the second mandate package was performed by CEN/TC 156 WG 21.
The revision includes the splitting of former EN 15241:2007 into 2 separate parts.
- prEN 16798-5-1 (covering full air conditioning systems)
- prEN 16798-5-2 (covering ventilation systems which intended for residential buildings)
The revision of this standard prEN 16798-5-2 includes changes:
- for a rearrangement of content versus EN 15242:2007, in order to better fit in the modular structure given
in EN 15603
- to cover ventilation systems which intended for residential buildings (including air heating and air cooling
definition see EN 13779 rev, module M5-1)
- for an improved fan energy calculation, taking into consideration control strategies according to TC 247
and fan product standards /data
- for an improved calculation of heat recovery devices, delivering the efficiency and auxiliary energy
depending on control
- the formatting according to the new rules set in CEN/TS 16629 Detailed Technical Rules
- the consideration of ISO TC 205 work performed in the meantime.
The standard was updated to cover especially monthly or seasonal time-step.
4

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1 Scope
Table 1 shows the relative position of this standard within the EN EPB set of standards.
Table 1 — Position of this standard in the modular structure
Overarching Building (as such) Technical Building Systems
sub1 sub1 sub1
M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M11
1 General 1 General 1 General
Common terms
and definitions; Building Energy
2 2 2 Needs
symbols, units Needs
and subscripts
(Free) Indoor
Maximum Load
Applications Conditions
3 3 3
and Pow er
w ithout Systems
Ways to Express Ways to Express Ways to
4 Energy 4 Energy 4 Express Energy
Performance Performance Performance
Building
Functions and Heat Transfer by Emission &
5 5 5
Building Transmission control
Boundaries
Building
Heat Transfer by
Occupancy and Distribution &
6 6 Infiltration and 6
Operating control
Ventilation
Conditions
Aggregation of
Energy Services Internal Heat Storage &
7 7 7
and Energy Gains control
Carriers
Building Generation &
Solar Heat Gains
8 8 8
Partitioning control
Load
Calculated Building
dispatching and
Energy Dynamics
9 9 9
operating
Performance (thermal mass)
conditions
Measured Measured Measured
10 Energy 10 Energy 10 Energy
Performance Performance Performance
11 Inspection 11 Inspection 11 Inspection
Ways to Express
12 12 -- 12 BMS
Indoor Comfort
External
13 Environment
Conditions
Economic
14
Calculation

This standard covers energy performance calculation of mechanical ventilation systems. It takes into account
the generation (air handling unit) and distribution (duct system) parts. It does not cover the emission part
(calculation of the required volume flow rates and/or supply air conditions), which is covered in prEN 16798-7
(revised EN 15242).
A calculation method for air conditioning systems, using an hourly calculation time step, is provided in a
separate standard prEN 16798-5-1.
5
Descriptions
Descriptions
Descriptions
Heating
Cooling
Ventilation
Humidifi
cation
Dehumidification
Domestic Hot water
Lighting
Building automation
& control
PV, wind, .

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oSIST prEN 16798-5-2:2015
prEN 16798-5-2:2015 (E)
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
EN 1507:2006, Ventilation for buildings - Sheet metal air ducts with rectangular section - Requirements for
strength and leakage
EN ISO 7345:1995, Thermal insulation - Physical quantities and definitions (ISO 7345:1987)
EN 12237:2003, Ventilation for buildings - Ductwork - Strength and leakage of circular sheet metal ducts
EN 12792:2003, Ventilation for buildings - Symbols, units and terminology
EN 13141 (all parts), Ventilation for buildings - Performance testing of components/products for residential
ventilation
EN 14239, Ventilation for buildings - Ductwork - Measurement of ductwork surface area
EN 16147:2011, Heat pumps with electrically driven compressors - Testing and requirements for marking of
domestic hot water units
prEN 16798-3:2014, Energy performance of buildings - Part 3: Ventilation for non-residential buildings -
Performance requirements for ventilation and room-conditioning systems (revision of EN 13779)
prEN 16573:2013, Energy performance of buildings — Modules M5-6, M5-8 — Ventilation for buildings —
Calculation methods for energy requirements of ventilation systems — Part 5-2: Distribution and generation
(revision of EN 15241) — method 2
prEN 15603:2014, Energy performance of buildings — Overarching standard EPB
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN ISO 7345:1995, prEN 15603:2014,
EN 12792:2003, prEN 16798-3:2014, and the following specific definitions apply.
3.1.1
cooled area
space that is cooled to a defined set-point temperature
3.1.2
duct heat losses
heat losses (by leakage and heat transfer) of the ductwork
3.1.3
duct leakage volume flow extracted from the ventilation zone
leakage air to the extract air ducts extracted from the ventilation zone
3.1.4
duct leakage volume flow going to the ventilation zone
leakage air from the supply air ducts going to the ventilation zone
3.1.5
extract volume flow from the ventilation zone
extract air flow rate extracted from the ventilation zone
6

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3.1.6
heat losses of the AHU
heat losses (by leakage and heat transfer) of the air handling unit
3.1.7
heat transferred by preheating/precooling
heat transferred to the outside air by preheating and precooling
3.1.8
heat transferred by recirculation
heat transferred to the outside air by recirculation of extract air
3.1.9
heat transferred by heat recovery
heat transferred to the outside air by heat recovery from extract air
3.1.10
recoverable AHU heat Losses
heat losses (by leakage and heat transfer) of the air handling unit, recoverable for heating and cooling
(negative values)
3.1.11
recoverable duct heat losses
heat losses (by leakage and heat transfer) of the ductwork, recoverable for heating and cooling (negative
values)
3.1.12
required AHU heating coil input
heat required to be supplied to the air handling unit for heating the supply air to the setpoint
3.1.13
required heating coil water inlet temperature
heating coil water inlet temperature required to heat the supply air to the setpoint
3.1.14
supply outside air fraction
fraction of outside air in the supply air
3.1.15
supply volume flow rate going to ventilation zone
supply air flow rate going to the ventilation zone
3.1.16
ventilated area
space which is provided with ventilation
3.1.17
ventilation auxiliary energy
auxiliary energy for the service of ventilation (for heat recovery drives, electrical preheating and for control)
7

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4 Symbols and abbreviations
4.1 Symbols
For the purposes of this document, the symbols given in prEN 15603:2014, EN 12792:2003 and the specific
symbols listed in Table 2 apply.
Table 2 — Symbols and units
Symbol Quantity Unit
F degree-hour value for preheating the air Kh
2
H surface coefficient of heat transfer W/(m ·K)
R evaporation heat of the water kWh/kg
X moisture content kg/kg
dry air
V velocity m/s
4.2 Subscripts
For the purposes of this document, the subscripts given in prEN 15603:2014, and the specific subscripts listed
in Table 3 apply.
Table 3 — Subscripts
Subscript Term Subscript Term
amb ambient lea leakage
cas casing nc non-conditioned
cnd conditioned nom nominal
damp water damp out output generation
des design prec precooling
dhh degree hour for preheating preh preheating
du duct rca recirculation
e external rh reheating
hp heat pump req required
hr heat recovery sur surrounding
in output generation xr humidity recovery
8

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4.3 Abbreviations
For the purposes of this document, the abbreviations given in prEN 15603:2014, and the specific subscripts
listed in Table 4 apply.
Table 4 — Abbreviations
Abbreviation Term
EHA Exhaust air
ETA Extract air
IDA Indoor air
ODA Outdoor air
RCA Recirculation air
SUP Supply air
5 Description of the method
5.1 Output of the method
The method covers the calculation of
— The volume flow rates provided to a single ventilation zone (no multi ventilation zones modelling) served
by the system, based on the required values;
— The supply air temperature and moisture content, based on the required values;
— The ventilation generation input (electric energy required by fans);
— Heating and cooling input to the air handling unit (to be transferred to the connected heating and cooling
distribution systems calculation);
— The recoverable heat or cold losses from ventilation/air conditioning system for heating or cooling.
— The ventilation auxiliary energy (electric energy for drives, control devices, actuators, .).
The time step of the output can be:
a. monthly
b. yearly
according to the application of the standard and time-step of the input.
5.2 Optional method
An alternative calculation method for air conditioning systems, using an hourly calculation time step, is
provided in a separate standard prEN 16798-5-1.
9

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6 Method
6.1 Output data
The output data of this method are listed in Table 5.
Table 5 — Output data of this method
Intended
Name Symbol Unit Range Varying
destination
Electrical input of heat pump for domestic hot
Q kWh 0.∞ M1–9 Yes
W;V;hp;in
water
Electrical input of heat pump for space
Q kWh 0.∞ M1–9 Yes
H;V;hp;in
heating
Q
Electrical input of heat pump for cooling kWh 0.∞ M1–9 Yes
C;V;hp;in
M1–9, M5–
Ventilation fan energy E kWh 0.∞ Yes
V;gen;fan
4
M1–9, M5–
Ventilation auxiliary energy W kWh 0.∞ Yes
V;aux
4
Q
Recoverable duct heat losses kWh 0.∞ M2–2 Yes
ls;V;dis;rbl

Recoverable AHU heat losses Q kWh 0.∞ M2–2 Yes
ls;V;gen;rbl

Required heating coil input Q kWh 0.∞ M3–1 Yes
H;V;in;req
Energy output of heat pump to domestic hot
Q kWh 0.∞ M3–1 Yes
W;V;hp;out
water system
Energy output of heat pump to the cooling
Q kWh 0.∞ M4–1 Yes
C;V;hp;out
system
Duct heat losses Q kWh 0.∞ M5–4 Yes
ls;V;dis
AHU heat losses Q kWh 0.∞ M5–4 Yes
ls;V;gen
Heat transferred by heat recovery Q kWh -∞.∞ M5–4 Yes
hr
3
Mean supply volume flow going to zone q m /h 0.∞ M5–5 Yes
V;SUP;dis
3
Mean extract volume flow from the zone q m /h 0.∞ M5–5 Yes
V;ETA;dis
Mean duct leakage supply volume flow going
3
q m /h 0.∞ M5–5 Yes
V;lea;SUP;dis
to zone
Mean duct leakage extract volume flow from
3
q m /h 0.∞ M5–5 Yes
V;lea;ETA;dis
the zone
Supply air temperature ϑ °C −273.∞ M5–5 Yes
SUP;dis;out;k
Supply air moisture content x kg/kg dry air 0.∞ M5–5 Yes
SUP;dis;out;k
Energy output of heat pump to the space
Q kWh 0.∞ M8–1 Yes
H;V;hp;out
heating system
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6.2 Calculation time steps
The method described in Clause 6 is designed for a monthly calculation time step. With the respective input
values it can also be applied for yearly calculation time steps.
For this method, the output time step is the same as the input time-step.
This method does not take into account any dynamic effect.
This method can be used within a dynamic calculation scheme.
If there are different types of ventilation system or single ventilation system components within a ventilation
zone (e.g. decentralized ventilation units for single rooms or reheating of supply air for single zones), then the
calculations shall use the ratios of area (calculation see TR).
6.3 Input data
6.3.1 Source of data
Input data about products that are required for the calculation described in this standard shall be the data
supplied by the manufacturer if they are declared according to relevant EN product standards.
If no such data from the manufacturer is available or if the required data are not product data, default values
are given in Annex B.
Default informative data given in Annex B may be replaced by other data, for example nationally determined
data. To ensure consistency with this calculation method, input data shall be presented according to the
template given in normative Annex A.
NOTE Compliance with the template given in Annex A does not guarantee that the new data set is consistent.
6.3.2 Product data
6.3.2.1 Product description data (qualitative)
There are no product description data necessary for this standard.
6.3.2.2 Product technical data
6.3.2.2.1 General
The product data shall be the value declared by the manufacturer according to certified measurements
performed according to the relevant product standards. If values declared by the manufacturer are not
available, then default values are given in informative Annex A.
Declared values are given at standard reference test conditions. Declared values shall be adjusted according
to actual operating conditions. This adjustment is part of the calculation procedure. This applies both to
standard test values and to field test measurements.
Required technical data for this calculation procedure are listed in Table 6.
11

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Table 6 — Product technical input data list
Computed
Catalogue Validity Vary-
Characteristics Symbol Ref.
unit interval ing
Unit
Duct leakage factor f -  6.3.2.2.2
lea;du
Air handling unit leakage factor f -  6.3.2.2.3
lea;ahu
Number of stages n -   No
st
Heat recovery temperature efficiency with
η -   No
hr;k
air volume flow with stage k
Humidity recovery efficiency with air
η
xr;k  -   No
volume flow with stage k
2
Air handling unit surface area A m   No
ahu
2 2
Air handling unit heat loss coefficient U W/m K kW/m K   No
ahu
Maximum rotation speed of the rotary heat
−1
n
rot;max min   No
recovery device
Rotor drive power at max. rotation speed Phr;rot;max  kW   No
Electric power consumption of the control
ΣP  kW   No
el;V;ctrl
devices (sensors, actuators, controllers)
coefficient of performance of the heat pump EN 16147
COP
W -  No
for domestic hot water prEN 16573
power consumption of the heat pump for 3 EN 16147
p  W/(m /h)  No
W;hp
domestic hot water prEN 16573
coefficient of performance of the heat pump EN 16147
COP
H -  No
for space heating prEN 16573
power consumption of the heat pump for 3 EN 16147
p  W/(m /h)  No
H;hp
space heating prEN 16573
Energy efficiency ratio of the heat pump for EN 16147
EER  -  No
cooling prEN 16573
power consumption of the heat pump for EN 16147
3
p  W/(m /h)  No
C;hp
cooling prEN 16573
6.3.2.2.2 Duct leakage factor
The duct leakage factor is calculated as
q
v;lea;du
f = 1+
lea;du
q
v;dis;req

(1)
The air flow through the duct leakage is calculated
e
p
A ⋅ c ⋅∆p
du lea;du du
q =
v;lea;du
3600
(2)
with
3
q m /h air volume flow rate through the duct leakages
V;lea;du
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2
A m duct area. It shall be calculated according to EN 14239
du
Δp
Pa pressure difference between duct and ambient air – unless otherwise
du
specified, this is:
In supply air ductwork: the average between the pressure difference at the
AHU outlet and the pressure difference right upstream of the air terminal
device.
In extract air ductwork: the average between the pressure difference right
downstream of the air terminal device and the pressure difference at the
AHU inlet.
3 2
c
m /(s*m ) for 1 Pa Air tightness factor of the ductwork. It shall be determined
lea;du
according to EN 12237 (circular ducts) and EN 1507 (rectangular ducts)
e - pressure difference exponent; default value: 0,65
p
NOTE These standards do not follow the rule “coefficients have dimensions; factors are dimensionless”; therefore
c is called a factor in these standards and has the symbol c.
lea,du
In the absence of detailed information, duct leakage factors can be used depending on the duct air tightness
class according to Table B.1.
6.3.2.2.3 Air handling unit leakage factor
The air handling unit leakage factor is calculated
q
v;lea;ahu
f = 1+
lea;ahu
q + q
v;dis;req v;lea;ahu

(3)
with
3
q m /h air handling unit leakage airflow determined according to EN 13141
V;lea;ahu
In the absence of detailed information, duct leakage factors can be used depending on the AHU air tightness
class according to Table B.3.
6.3.3 System design data
6.3.3.1 Process design
The quantitative process design data are given in Table 7.
Default data, where appropriate, are given in Annex B.
Table 7 — Quantitative process design data
Catalogue Computed Validity
Characteristics Symbol Ref. Varying
unit Unit interval
Heat transfer coefficient from the supply
H
du;SUP;nc W/K kW/K 0.∞ * No
duct to the non-conditioned surrounding
Heat transfer coefficient of the supply air
H W/K kW/K 0.∞ * No
du;SUP;cnd
duct to the thermal zone.
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6.3.3.2 Control
The process control options are defined given by
— Control of the volume flow rate:
- Time dependent flow rate control, continuous operation during occupancy time
- Multi stage variable flow rate control
— Control of the supply air temperature: no control
— Control of the air recirculation: fixed proportion of recirculation air
— Control of the heat recovery device, depending on the heat recovery type:
- Flat plate heat exchanger without heat recovery control
- Flat plate heat exchanger is bypassed
- Rotary heat exchanger with control by changing the rotation speed
— Control of the heat pump: ON/OFF compressor
— control of the frost protection: frost is prevented by controlling the leaving temperature from the heat
recovery device
— Control of the fan: no control
14

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prEN 16798-5-2:2015 (E)
6.3.4 Operating conditions
Required operating conditions for this calculation procedure are listed in Table 8.
Table 8 — Operating conditions data list
Origin
Name Symbol Unit Range Varying
Module
Calculation interval t mth 1…12 M1–9
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