SIST EN 16798-5-1:2018

SLOVENSKI STANDARD
oSIST prEN 16798-5-1:2015
01-julij-2015
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Energy performance of buildings - Modules M5-6, M5-8, M6-5, M6-8, M7-5, M7-8 -
Ventilation for buildings - Calculation methods for energy requirements of ventilation and
air conditioning systems - Part 5-1: Distribution and generation (revision of EN 15241) -
Method 1
Energieeffizienz von Gebäuden - Module M5-6, M5-8, M6-5, M6-8, M7-5, M7-8 - Lüftung
von Gebäuden - Berechnungsmethoden für den Energiebedarf von Lüftungs- und
Klimaanlagen - Teil 5-1: Verteilung und Erzeugung (Revision von EN 15241) - Methode 1
Performance énergétique des bâtiments - Modules M5-6, M5-8, M6-5, M6-8, M7-5, M7-8
- Ventilation des bâtiments - Méthodes de calcul pour les besoins énergétiques des
systèmes de ventilation et de conditionnement d'air - Partie 5-1 : Distribution et
génération (révision de l'EN 15241) - Méthode 1
Ta slovenski standard je istoveten z: prEN 16798-5-1
ICS:
91.120.10 Toplotna izolacija stavb Thermal insulation
91.140.30 3UH]UDþHYDOQLLQNOLPDWVNL Ventilation and air-
VLVWHPL conditioning
oSIST prEN 16798-5-1:2015 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 16798-5-1:2015

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oSIST prEN 16798-5-1:2015

EUROPEAN STANDARD
DRAFT
prEN 16798-5-1
NORME EUROPÉENNE

EUROPÄISCHE NORM

May 2015
ICS 91.120.10; 91.140.30 Will supersede EN 15241:2007
English Version
Energy performance of buildings - Modules M5-6, M5-8, M6-5,
M6-8, M7-5, M7-8 - Ventilation for buildings - Calculation
methods for energy requirements of ventilation and air
conditioning systems - Part 5-1: Distribution and generation
(revision of EN 15241) - method 1
 Energieeffizienz von Gebäuden - Teil 5: Lüftung von
Gebäuden - Module M5-6, M5-8, M6-5, M6-8, M7-5, M7-8 -
Berechnungsmethoden für energetische Anforderungen von
Lüftungs- und Klimaanlagen
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 16798-5-1:2015 E
worldwide for CEN national Members.

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oSIST prEN 16798-5-1:2015
prEN 16798-5-1:2015 (E)
Contents Page
Foreword .4
Introduction .6
1 Scope .7
2 Normative references .8
3 Terms and definitions .9
4 Symbols and abbreviations . 10
4.1 Symbols . 10
4.2 Subscripts . 11
5 Description of the method — Output of the method . 11
6 Method . 12
6.1 Output data . 12
6.2 Calculation time steps . 14
6.3 Input data . 14
6.3.1 Source of data . 14
6.3.2 Product data . 15
6.3.3 System design data . 20
6.3.4 Operating conditions . 23
6.3.5 Constants and physical data . 24
6.4 Calculation procedure . 24
6.4.1 Applicable timestep . 24
6.4.2 Distribution calculation . 24
6.4.3 Generation calculation . 28
6.4.4 Energy calculation . 41
7 Quality control . 47
8 Compliance check . 47
Annex A (normative) Template for input data and choices — Method 1 . 48
A.1 Product description data — Default product description data . 48
A.2 Product technical data . 48
A.2.1 Default duct tightness class . 48
A.2.2 Default air handling unit tightness class . 48
A.2.3 Default heat recovery leakage and outdoor air factors . 48
A.2.4 Default nominal heat recovery temperature efficiency and constants for the velocity
dependence . 49
A.2.5 Default humidity recovery efficiency and constants for the calculation . 49
A.2.6 Default value for adiabatic cooling humidifier efficiency . 50
A.2.7 Default values for cooling and heating coil calculation . 50
A.2.8 Air handling unit related default values . 50
A.2.9 Fan related default values . 51
A.2.10 Specific pump energy for humidification . 51
A.3 System design data . 52
A.3.1 Qualitative process design data choices . 52
A.3.2 Default fan motor heat recovery factors . 52
A.3.3 Default quantitative process design data choices . 52
A.3.4 Limit values for the defrost control . 52
A.3.5 Default process control options . 53
A.3.6 Default heat recovery control options . 53
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Annex B (informative) Default input data — Method 1 . 54
B.1 Product description data — Default product description data . 54
B.2 Product technical data . 54
B.2.1 Default duct tightness class . 54
B.2.2 Default air handling unit tightness class . 54
B.2.3 Default heat recovery leakage and outdoor air factors . 54
B.2.4 Default nominal heat recovery temperature efficiency and constants for the velocity

dependence . 55
B.2.5 Default humidity recovery efficiency and constants for the calculation . 55
B.2.6 Default value for adiabatic cooling humidifier efficiency . 56
B.2.7 Default values for cooling and heating coil calculation . 56
B.2.8 Air handling unit related default values . 56
B.2.9 Fan related default values . 57
B.2.10 Specific pump energy for humidification . 57
B.3 System design data . 58
B.3.1 Qualitative process design data choices . 58
B.3.2 Default fan motor heat recovery factors . 58
B.3.3 Default quantitative process design data choices . 58
B.3.4 Limit values for the defrost control . 58
B.3.5 Default process control options . 59
B.3.6 Default heat recovery control options . 59
Annex C (informative) Calculation method for ground preheating and -cooling . 60
C.1 Calculation . 60
C.1.1 Temperature difference . 60
C.1.2 Moisture difference . 61
C.1.3 Pressure losses of the heat exchanger . 62
C.2 Data . 62
Bibliography . 63

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oSIST prEN 16798-5-1:2015
prEN 16798-5-1:2015 (E)
Foreword
This document (prEN 16798-5-1:2015) 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, along with prEN 16798-5-2:2014, will supersede EN 15241:2007.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association.
EN 16798 currently comprises the following parts:
— prEN 16798-3, Energy performance of buildings — Part 3: Ventilation for non-residential buildings —
Performance requirements for ventilation and room-conditioning systems;
— prEN 16798-5-1, Energy performance of buildings — Modules M5-6, M5-8, M6-5, M6-8, M7-5, M7-8 —
Ventilation for buildings — Calculation methods for energy requirements of ventilation and air conditioning
systems — Part 5-1: Distribution and generation (revision of EN 15241) — method 1 [the present
document];
— prEN 16798-5-2, 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 16798-7, Energy performance of buildings — Part 7: Ventilation for buildings — Modules M5-1, M5-
5, M5-6, M5-8 — Calculation methods for the determination of air flow rates in buildings including
infiltration;
— prEN 16798-9, Energy performance of buildings — Part 9: Ventilation for buildings — Module M4-1 —
Calculation methods for energy requirements of cooling systems — General;
— prEN 16798-11, Energy performance of buildings — Module M4-3 — Calculation of the design cooling
load;
— prEN 16798-13, Energy performance of buildings — Part 13: Module M4-8 — Calculation of cooling
systems - Generation;
— prEN 16798-15, Energy performance of buildings — Part 15: Module M4-7 — Calculation of cooling
systems — Storage — General;
— prEN 16798-17, Energy performance of buildings — Part 17: Ventilation for buildings — Module M4-11,
M5-11, M6-11, M7-11 — Guidelines for inspection of ventilation and air conditioning systems;
— prEN 16798-11, Energy performance of buildings — Module M4-3 — Calculation of the design cooling
load.
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 changes:
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— for a rearrangement of content versus EN 15242:2007, in order to better fit in the modular structure given
in prEN 15603:2013;
— to cover full air conditioning systems (including heating, cooling humidification, dehumidification; definition
see EN 13779, module M5-1);
— 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 different types of heat recovery devices (air-to-air HX, rotary and pumped
circuit), delivering the efficiency and auxiliary energy depending on control, including moisture transfer;
— for the consideration of recirculation, including control;
— for an improved humidification calculation for different humidifier types, including auxiliary energy;
— for the calculation of adiabatic cooling;
— the formatting according to the new rules set in CEN/TS 16629;
— the consideration of ISO/TC 205 work performed in the meantime.
Due to the fact that the scope is not identical, a separate document prEN 16798-5-2 was prepared for a
second method B, covering compact ventilation systems including heat / DHW generation with a monthly /
seasonal calculation method.
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oSIST prEN 16798-5-1:2015
prEN 16798-5-1:2015 (E)
Introduction
This draft 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 “EPB set of standards”.
As part of the “EPB set of standards” it complies with the requirements for the set of basic EPB documents
(EN 15603 (see Clause 2), CEN/TS 16628 and CEN/TS 16629 (see Bibliography [2] and [3])) developed
under a mandate given to CEN by the European Commission and the European Free Trade Association
(Mandate M/480, [4]), and supports essential requirements of EU Directive 2010/31/EU on the energy
performance of buildings (EPBD).
Where appropriate, the method(s) in each of the EPB standards may provide simplified procedures and/or
default values as alternative options.
— Without further specification, these simplified procedures and/or default values may be used without
restricting criteria.
NOTE For instance because these are conservative procedures or values.
The term 'default values' should not be confused with 'informative values'. If the values are given in the
normative part of the standard, they are normative values. See also next options.
— In other cases, these simplified procedures and/or default values may be intended to be used only for
situations where there is limited information. This may be the case in existing buildings with limited
possibilities to acquire all input data. In particular when the EPB set of standards is used in the context of
national or regional building regulations, specific criteria when the simplified method and/or default data
are allowed, may be given at national or regional level, following the template in Annex A. Annex B
provides (informative) default choices.
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;
3) installation and commissioning of ventilation and air conditioning systems.
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oSIST prEN 16798-5-1:2015
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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 within the EN EPB set of standards
Building
Overarching   Technical Building Systems
(as such)
sub1 M1  sub1 M2  sub1  M3 M4 M5 M6 M7 M8 M9 M10 M11
1 General  1 General  1 General
Common
terms and
definitions; Building
2 2 2
  Needs
symbols, Energy Needs
units and
subscripts
(Free) Indoor
Maximum
Conditions
3  3  3
Applications Load and
without
Power
Systems
Ways to
Ways to Ways to
Express
Express Express
4  4  4 Energy
Energy Energy
Performanc
Performance Performance
e
Building
Heat Transfer
Functions Emission
5  5 by  5
and Building and control
Transmission
Boundaries
Building
Heat Transfer
Occupancy
by Infiltration Distribution
6 and  6  6
and and control
Operating
Ventilation
Conditions
Aggregation
of Energy
Internal Heat Storage
7 Services and  7  7
Gains and control
Energy
Carriers
Building Solar Heat Generation
8  8  8
Partitioning Gains and control
Load
Building
Calculated dispatching
Dynamics
9 Energy  9  9 and
(thermal
Performance operating
mass)
conditions
Measured Measured
Measured
10 Energy  10 Energy  10
Energy
Performance Performance
Performanc
7

Descriptions


Descriptions


Descriptions
Heating
Cooling
Ventilation
Humidifi
cation
Dehumidification
Domestic Hot
water
Lighting
Building
automation and
control
PV, wind, .

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oSIST prEN 16798-5-1:2015
prEN 16798-5-1:2015 (E)
Building
Overarching   Technical Building Systems
(as such)
sub1 M1  sub1 M2  sub1  M3 M4 M5 M6 M7 M8 M9 M10 M11
e
11 Inspection  11 Inspection  11 Inspection
Ways to
Express
12     12 BMS
Indoor
Comfort
External
13 Environment
Conditions
Economic
14
Calculation
This draft standard covers energy performance calculation of mechanical ventilation and air conditioning
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 compact ventilation systems with
integrated heating/cooling generation, using a monthly or seasonal calculation time step, is provided in a
separate standard prEN 16798-5-2.
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 1886, Ventilation for buildings — Air handling units — Mechanical performance
EN 12237, Ventilation for buildings — Ductwork — Strength and leakage of circular sheet metal ducts
EN 12792:2003, Ventilation for buildings — Symbols, units and terminology
EN 13053, Ventilation for buildings — Air handling units — Rating and performance for units, components and
sections
EN 14239 Ventilation for buildings — Ductwork — Measurement of ductwork surface area
prEN 15603:2013, Energy performance of buildings — Overarching standard EPB
prEN 16798-3:2014, Energy performance of buildings — Part 3: Ventilation for non-residential buildings —
Performance requirements for ventilation and room-conditioning systems
8

Descriptions


Descriptions


Descriptions
Heating
Cooling
Ventilation
Humidifi
cation
Dehumidification
Domestic Hot
water
Lighting
Building
automation and
control
PV, wind, .

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oSIST prEN 16798-5-1:2015
prEN 16798-5-1:2015 (E)
EN ISO 5801, Industrial fans — Performance testing using standardized airways (ISO 5801)
EN ISO 7345:1995, Thermal insulation — Physical quantities and definitions (ISO 7345:1987)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN ISO 7345:1995, prEN 15603:2013,
EN 12792:2003 and prEN 16798-3:2014, and the following apply.
3.1.1
duct heat losses
heat losses (by leakage and heat transfer) of the ductwork
3.1.2
duct leakage volume flow extracted from a ventilation zone i
leakage air to the extract air ducts extracted from a ventilation zone
3.1.3
duct leakage volume flow going to a ventilation zone i
the leakage air from the supply air ducts going to a ventilation zone
3.1.4
extract volume flow from a ventilation zone i
extract air flow rate extracted from a ventilation zone
3.1.5
heat losses of the AHU
heat losses (by leakage and heat transfer) of the air handling unit
3.1.6
heat transferred by ground preheating/cooling
heat transferred to the outside air by ground preheating and cooling
3.1.7
heat transferred by recirculation
heat transferred to the outside air by recirculation of extract air
3.1.8
heat transferred by heat recovery
heat transferred to the outside air by heat recovery from extract air
3.1.9
humidification auxiliary energy
auxiliary energy needed for humidification (for pumps etc.)
3.1.10
humidification generation input
energy of carrier cr required by the humidifier (for steam humidifiers)
3.1.11
recoverable AHU heat Losses
heat losses (by leakage and heat transfer) of the air handling unit, recoverable for heating and cooling
(negative values)
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3.1.12
recoverable duct heat losses
heat losses (by leakage and heat transfer) of the ductwork, recoverable for heating and cooling (negative
values)
3.1.13
required AHU cooling coil output
heat required to be extracted from air handling unit for cooling and dehumidification of the supply air to the
setpoints
3.1.14
required AHU heating coil input
heat required to be supplied to the air handling unit for heating the supply air to the setpoint
3.1.15
required cooling coil water inlet temperature
cooling coil water inlet temperature required for cooling and dehumidification of the supply air to the setpoints
3.1.16
required heating coil water inlet temperature
heating coil water inlet temperature required to heat the supply air to the setpoint
3.1.17
required supply air moisture content
moisture content of the supply air leaving the air distribution the supply air to the setpoints
3.1.18
supply outside air fraction
fraction of outside air in the supply air
3.1.19
supply volume flow rate going to ventilation zone i
supply air flow rate going to a ventilation zone
3.1.20
ventilation auxiliary energy
auxiliary energy for the service of ventilation (for heat recovery drives, electrical preheating and for control)
4 Symbols and abbreviations
4.1 Symbols
For the purposes of this Standard, the symbols given in prEN 15603:2013, EN 12792:2003 and the specific
symbols listed in Table 2 apply.
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Table 2 — Symbols and units
Symbol Name of quantity Unit
e Exponent -
−1
n Rotation number min
7
R Flow resistance kg / m
r Evaporation heat of the water kWh/kg
v Velocity m/s
x Moisture content kg / kg dry air
ε Heat recovery efficiency -
4.2 Subscripts
For the purposes of this draft European Standard, the subscripts given in prEN 15603:2013, and the specific
subscripts listed in Table 3 apply.
Table 3 —Subscripts
EHA Exhaust air Coil Coil nom nominal
ETA Extract air Cnd Conditioned req required
IDA Indoor air Ctrl Control rot Rotation
ODA Outdoor air Des Design st1.stn Stage 1 to stage n
RCA Recirculation air Du Duct sur surrounding
SUP Supply air hr heat recovery xr humidity recovery
a Air lea Leakage zt Thermal zone
ahu Air handling unit nc non-conditioned zv Ventilation zone
5 Description of the method — Output of the method
The method covers the calculation of:
— the volume flow rates provided to the ventilation zones served by the system, based on the required
values;
— the supply air temperature and moisture content, based o
...