EN ISO 52017-1:2017

SLOVENSKI STANDARD
01-september-2017
Nadomešča:
SIST EN 15255:2007
SIST EN 15265:2007
SIST EN ISO 13791:2012
SIST EN ISO 13792:2012
Energijske lastnosti stavb - Zaznavne in latentne toplotne obremenitve ter notranje
temperature - 1. del: Splošni računski postopki (ISO 52017-1:2017)
Energy performance of buildings - Sensible and latent heat loads and internal
temperatures - Part 1: Generic calculation procedures (ISO 52017-1:2017)
Energieeffiziens von Gebäuden - Fühlbare und latente Wärmelasten und
Innentemperaturen - Teil 1: Allgemeine Berechnungsverfahren (ISO 52017-1:2017)
Performance énergétique des bâtiments - Charges thermiques latentes et sensibles et
températures intérieures - Partie 1: Méthodes de calcul génériques (ISO 52017-1:2017)
Ta slovenski standard je istoveten z: EN ISO 52017-1:2017
ICS:
27.015 Energijska učinkovitost. Energy efficiency. Energy
Ohranjanje energije na conservation in general
splošno
91.120.10 Toplotna izolacija stavb Thermal insulation of
buildings
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 52017-1
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2017
EUROPÄISCHE NORM
ICS 91.120.10 Supersedes EN 15255:2007, EN 15265:2007, EN ISO
13791:2012, EN ISO 13792:2012
English Version
Energy performance of buildings - Sensible and latent heat
loads and internal temperatures - Part 1: Generic
calculation procedures (ISO 52017-1:2017)
Performance énergétique des bâtiments - Charges Energieeffiziens von Gebäuden - Fühlbare und latente
thermiques latentes et sensibles et températures Wärmelasten und Innentemperaturen - Teil 1:
intérieures - Partie 1: Méthodes de calcul génériques Allgemeine Berechnungsverfahren (ISO 52017-1:2017)
(ISO 52017-1:2017)
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 ISO 52017-1:2017 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
European foreword
This document (EN ISO 52017-1:2017) has been prepared by Technical Committee ISO/TC 163
"Thermal performance and energy use in the built environment" in collaboration with Technical
Committee CEN/TC 89 “Thermal performance of buildings and building components” the secretariat of
which is held by SIS.
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 January 2018, and conflicting national standards shall
be withdrawn at the latest by January 2018.
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 has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association.
This document is part of the set of standards on the energy performance of buildings (the set of EPB
standards) and has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association (Mandate M/480, see reference [EF1] below), and supports essential
requirements of EU Directive 2010/31/EC on the energy performance of buildings (EPBD, [EF2]).
In case this 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, in particular for the
application within the context of EU Directives transposed into national legal requirements.
Further target groups are users of the voluntary common European Union certification scheme for the
energy performance of non-residential buildings (EPBD art.11.9) and any other regional (e.g. Pan
European) parties wanting to motivate their assumptions by classifying the building energy
performance for a dedicated building stock.
References:
[EF1] 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 of buildings (2010/31/EU) of 14th December 2010
[EF2] EPBD, Recast of the Directive on the energy performance of buildings (2010/31/EU) of
th
14 December 2010
[EF3] EN 15265:2007, Energy performance of buildings — Calculation of energy needs for space
heating and cooling using dynamic methods — General criteria and validation procedures
[EF4] EN 15255:2007, Thermal performance of buildings Sensible room cooling load calculation -
General criteria and validation procedures
Together with EN ISO 52016-1 this document supersedes EN ISO 13791:2012, EN ISO 13792:2012,
EN 15255:2007 [EF3] and EN 15265:2007 [EF4].
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.
Endorsement notice
The text of ISO 52017-1:2017 has been approved by CEN as EN ISO 52017-1:2017 without any
modification.
INTERNATIONAL ISO
STANDARD 52017-1
First edition
2017-06
Energy performance of buildings —
Sensible and latent heat loads and
internal temperatures —
Part 1:
Generic calculation procedures
Performance énergétique des bâtiments — Charges thermiques
latentes et sensibles et températures intérieures —
Partie 1: Méthodes de calcul génériques
Reference number
ISO 52017-1:2017(E)
©
ISO 2017
ISO 52017-1:2017(E)
© ISO 2017, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved

ISO 52017-1:2017(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols and subscripts . 3
4.1 Symbols . 3
4.2 Subscripts . 4
5 Brief description of the method . 5
5.1 Output of the method . 5
5.2 General description of the method . 5
6 Calculation method . 5
6.1 Output data . 5
6.2 Calculation time interval and calculation period . 6
6.3 Input data . 6
6.4 Calculation procedure . 7
6.4.1 Applicable time interval . 7
6.4.2 Assumptions . 7
6.4.3 Calculation of relevant temperatures . 8
6.4.4 Building zone thermal balance (sensible heat) .12
6.4.5 Heat transfer components .13
6.4.6 Building zone moisture and latent heat balance .22
6.4.7 Calculation steps .23
6.4.8 Boundary conditions .24
7 Quality control .25
7.1 Report of the calculation .25
7.2 Validation cases .25
8 Compliance check .26
Annex A (normative) Input and method selection data sheet — Template .27
Annex B (informative) Input and method selection data sheet — Default choices .29
Bibliography .31
ISO 52017-1:2017(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO’s adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: w w w . i s o .org/ iso/ foreword .html.
ISO 52017-1 was prepared by ISO Technical Committee ISO/TC 163, Thermal performance and energy
use in the built environment, Subcommittee SC 2, Calculation methods, in collaboration with the European
Committee for Standardization (CEN) Technical Committee CEN/TC 89, Thermal performance of
buildings and building components, in accordance with the Agreement on technical cooperation between
ISO and CEN (Vienna Agreement).
This first edition of ISO 52017-1 cancels and replaces ISO 13791:2012, which has been technically
revised.
A list of all parts in the ISO 52017 series can be found on the ISO website.
iv © ISO 2017 – All rights reserved

ISO 52017-1:2017(E)
Introduction
This document is part of a series aimed at the international harmonization of the methodology for
assessing the energy performance of buildings. Throughout, this series is referred to as a “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 document, a normative template is given in Annex A to specify these choices.
Informative default choices are provided in Annex B.
The main target groups for this document are architects, engineers and regulators.
Use by or for regulators: In case the document 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 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 document to assess the energy performance of a building, and thereby use
the choices made by the regulators.
Topics addressed in this document can be subject to public regulation. Public regulation on the same
topics can override the default values in Annex B. Public regulation on the same topics can even, for
certain applications, override the use of this document. 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 a national annex (e.g. NA) is recommended,
containing a reference to these data sheets;
— 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.
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 document (ISO/TR 52016-
[3]
2 ) accompanying this document.
The subset of EPB standards prepared under the responsibility of ISO/TC 163/SC 2 cover inter alia:
— calculation procedures on the overall energy use and energy performance of buildings;
— calculation procedures on the internal temperature in buildings (e.g. in case of no space heating or
cooling);
ISO 52017-1:2017(E)
— indicators for partial EPB requirements related to thermal energy balance and fabric features;
— calculation methods covering the performance and thermal, hygrothermal, solar and visual
characteristics of specific parts of the building and specific building elements and components, such
as opaque envelope elements, ground floor, windows and facades.
ISO/TC 163/SC 2 cooperates with other TC’s for the details on, e.g. appliances, technical building
systems and indoor environment.
This document is intended for use by specialists to develop methods for the hourly or subhourly
calculation of the internal temperatures and/or the heating, cooling and/or the humidification loads of
a thermal zone in a building.
Examples of application of such methods includes the following:
a) assessing the risk of internal overheating;
b) optimizing aspects of building design (building thermal mass, solar protection, ventilation rate,
etc.) to provide thermal comfort conditions;
c) assessing whether a building requires mechanical cooling;
d) assessing the energy needs for heating and cooling and for humidification and dehumidification;
e) assessing the sensible heating and cooling and humidification and dehumidification loads under
system design conditions.
Criteria for building performance are not included. They can be considered at national level. This
document can also be used as a reference to develop more simplified methods for the above and similar
applications.
Specific calculation procedures based on the generic calculation procedures of this document are given
in ISO 52016-1. The specific simplifications, assumptions and boundary conditions in ISO 52016-1 are
tailored to the respective application areas.
The main differences compared to ISO 13791 are the following:
— assumptions or procedures that are not relevant for the generic calculation procedures have been
moved to the standard with specific application and combined with other specific assumptions and
procedures, for example, specification of the convective heat transfer coefficients;
— the calculation of the operative temperature is added. The solution techniques for the calculation of
the operative temperature are not provided in this document, but left up to the specific application
standards (e.g. ISO 52016-1);
— the heat flow rates representing the sensible heating and cooling loads and the humidification and
dehumidification loads to hold a specific (temperature, moisture) set point are added to the formulae.
This widens the application range of the generic calculation procedures without adding complexity.
The solution techniques for the calculation of these loads are not provided in this standard, but
left up to the specific application standards (e.g. ISO 52016-1), because this is highly application
dependent;
— the validation cases have been removed, because there is no need to validate the implementation of
the generic calculation method itself. Conformance criteria and deviation allowances highly depend
[1]
on the application area. Moreover, the reference results of the main validation cases of ISO 13791
were questioned and could not be reproduced. Instead, the “BESTEST” test suite, standardized
[9]
as ANSI/ASHRAE 140 , comprises a number of test cases that are appropriate for (optional)
validation of the calculation methods described in this document. The relevant subset of BESTEST
cases is similar to the test cases of ISO 13791. The most relevant BESTEST cases have been adopted
in ISO 52016-1 for verification of the specific calculation procedures of that standard.
vi © ISO 2017 – All rights reserved

ISO 52017-1:2017(E)
Relevant editorial changes have been made, based on the detailed technical rules for all EPB standards,
including moving all (still relevant) informative annexes to a separate accompanying technical report
[3]
(ISO/TR 52016-2 ).
Table 1 shows the relative position of this document within the set of EPB standards in the context of
the modular structure as set out in ISO 52000-1.
[6]
NOTE In 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.
The modules represent EPB standards, although one EPB standard may cover more than one module
and one module may 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.
Table 1 — Position of this document (in casu M2–2, M2–3, M3–3, M4–3, M6–3, M7–3), within the
modular structure of the set of EPB standards
Building
Overarching Technical building systems
(as such)
Build-
Do- ing
Sub- De- Ven- PV,
Descrip- Descrip- Humidifi- Dehumidi- mestic Light- auto-
mod- scrip- Heating Cooling tila- wind
tions tions cation fication hot ing mation
ule tions tion ,.
water and
control
sub1 M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M11
1 General General General
Common
terms
and defi-
Building
nitions;
a
2 energy ISO 52017-1 Needs
symbols,
needs
units and
sub-
scripts
(Free)
Indoor Maxi-
Applica- condi- mum
3 ISO 52017-1 ISO 52017-1 ISO 52017-1 ISO 52017-1 ISO 52017-1
tions tions load and
without power
systems
Ways to Ways to Ways to
express express express
4 energy energy energy
perfor- perfor- perfor-
mance mance mance
a
The shaded modules are not applicable
ISO 52017-1:2017(E)
Building
Overarching Technical building systems
(as such)
Build-
Do- ing
Sub- De- Ven- PV,
Descrip- Descrip- Humidifi- Dehumidi- mestic Light- auto-
mod- scrip- Heating Cooling tila- wind
tions tions cation fication hot ing mation
ule tions tion ,.
water and
control
sub1 M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M11
Building
catego- Heat
Emis-
ries and transfer
5 sion and
building by trans-
control
bounda- mission
ries
Building Heat
occupan- transfer Distri-
cy and by infil- bution
operat- tration and
ing con- and ven- control
ditions tilation
Aggre-
gation of
energy Internal Storage
7 services heat and
and gains control
energy
carriers
Solar Genera-
Building
8 heat tion and
zoning
gains control
Load
Calcu- Building dis-
lated dy- patching
9 energy namics and op-
perfor- (thermal erating
mance mass) condi-
tions
Meas- Meas- Meas-
ured ured ured
10 energy energy energy
perfor- perfor- perfor-
mance mance mance
a
The shaded modules are not applicable
viii © ISO 2017 – All rights reserved

ISO 52017-1:2017(E)
TTabablele 1 1 ((ccoonnttiinnueuedd))
Building
Overarching Technical building systems
(as such)
Build-
Do- ing
Sub- De- Ven- PV,
Descrip- Descrip- Humidifi- Dehumidi- mestic Light- auto-
mod- scrip- Heating Cooling tila- wind
tions tions cation fication hot ing mation
ule tions tion ,.
water and
control
sub1 M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M11
Inspec- Inspec- Inspec-
tion tion tion
Ways to
express
12 BMS
indoor
comfort
External
envi-
13 ronment
condi-
tions
Economic
14 calcula-
tion
a
The shaded modules are not applicable
INTERNATIONAL STANDARD ISO 52017-1:2017(E)
Energy performance of buildings — Sensible and latent
heat loads and internal temperatures —
Part 1:
Generic calculation procedures
1 Scope
This document specifies the general assumptions, boundary conditions and equations for the
calculation, under transient hourly or subhourly conditions, of the internal temperatures (air and
operative) and/or the heating, cooling and humidification and dehumidification loads to hold a specific
(temperature, moisture) set point, in a single building zone. No specific numerical techniques are
imposed by this document.
Specific calculation procedures based on the generic calculation procedures of this document are given
in ISO 52016-1. The specific simplifications, assumptions and boundary conditions in ISO 52016-1 are
tailored to the respective application areas, such as the energy need for heating and cooling and for
humidification and dehumidification, hourly internal temperature, design heating and cooling and
humidification and dehumidification load.
NOTE Table 1 in the Introduction shows the relative position of this document within the set of EPB
standards in the context of the modular structure as set out in ISO 52000-1.
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.
ISO 7345, Thermal insulation — Physical quantities and definitions
ISO 13370, Thermal performance of buildings — Heat transfer via the ground — Calculation methods
ISO 52000-1:2017, Energy performance of building — Overarching EPB assessment — Part 1: General
framework and procedures
ISO 52010-1, Energy performance of buildings — External climatic conditions — Part 1: Conversion of
climatic data for energy calculations
ISO 52016-1, Energy performance of buildings — Energy needs for heating and cooling, internal
temperatures and sensible and latent heat loads — Part 1: Calculation procedures
NOTE 1 Default references to EPB standards other than ISO 52000-1 are identified by the EPB module code
number and given in Annex A (normative template in Table A.1) and Annex B (informative default choice in
Table B.1).
EXAMPLE 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 2 In this document, there are no choices in references to other EPB standards. The sentence and note
above is kept to maintain uniformity between all EPB standards.
ISO 52017-1:2017(E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 7345, ISO 52000-1 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
NOTE The terms of ISO 52000-1 that are indispensable for the understanding of the underlying standard are
repeated here.
3.1
building element
wall, roof, ceiling, floor, door or window that separates the internal environment from the external
environment or an adjacent space
Note 1 to entry: The definition in ISO 52000-1 reads: “integral component of the technical building systems or of
the fabric of a building”.
3.2
building thermal zone
thermal zone
internal environment with assumed sufficiently uniform thermal conditions to enable a thermal
balance calculation according to the procedures in this document
3.3
design load
maximum hourly mean value of the load, occurring during a design climate period under design use
conditions
3.4
EPB standard
[5]
standard that complies with the requirements given in ISO 52000-1, CEN/TS 16628 and
[6]
CEN/TS 16629
Note 1 to entry: These three basic EPB documents were developed under a mandate given to CEN by the European
Commission and the European Free Trade Association (see Reference [7]), and support essential requirements of
EU Directive 2010/31/EU on the energy performance of buildings (see Reference [8]). Several EPB standards and
related documents are developed or revised under the same mandate.
[SOURCE: ISO 52000-1:2017, 3.5.14]
3.5
humidification or dehumidification moisture load
hourly mean value of the water vapour mass flow to be supplied to, or extracted from the internal
environment to maintain a specified minimum or maximum humidity within the space
3.6
internal air
air of the internal environment
3.7
internal air temperature
temperature of the air in the internal environment
3.8
internal environment
closed space delimited from the external environment or adjacent spaces by building elements
2 © ISO 2017 – All rights reserved

ISO 52017-1:2017(E)
3.9
internal surface temperature
temperature of the internal surface of a building element
3.10
mean radiant temperature
uniform surface temperature of the internal environment in which an occupant would exchange the
same amount of radiant heat as in the actual non-uniform enclosure
3.11
operative temperature
uniform temperature of the internal environment in which an occupant would exchange the same
amount of heat by radiation plus convection as in the actual non-uniform environment
3.12
(sensible) heating or cooling load
hourly mean value of the heating or cooling heat flow rate supplied to or extracted from the internal
environment to maintain the intended space temperature conditions
4 Symbols and subscripts
4.1 Symbols
For the purposes of this document, the symbols given in ISO 52000-1, Clause 4 and Annex C and the
following apply.
Symbol Quantity Unit
A area m
a thermal diffusivity m /s
C heat capacity J/K
c specific heat capacity J/(kg·K)
c coefficient various
d thickness m
E ventilation parameter —
r
F view factor —
f factor —
f fraction —
G moisture flow kg/s
g heat flow rate per volume W/m
s
g acceleration due to gravity m/s
H heat transfer coefficient W/K
h surface coefficient of heat transfer W/(m ·K)
h latent heat J/kg
I irradiance W/m
J radiosity W/m
l length M
m mass flow rate kg/s
p pressure Pa
q heat flow density W/m
q air volume flow rate m /h
V
R thermal resistance m ·K/W
ISO 52017-1:2017(E)
Symbol Quantity Unit
T thermodynamic temperature K
t time s
U thermal transmittance W/(m ·K)
V volume m
v velocity m/s
x moisture content or mixing ratio kg/kg(dry
air)
x, y, z coordinates m
Λ thermal conductance W/(m ·K)
Φ heat flow rate W
α absorptance —
ε emissivity —
θ Celsius temperature °C
λ thermal conductivity W/(m·K)
μ viscosity kg/(m·s)
ν humidity by volume kg/m
−8 2 4
σ Stefan-Boltzmann constant, 5,670 × 10 W/(m ·K )
ρ reflectance —
ρ density kg/m
χ point thermal transmittance W/K
Ψ linear thermal transmittance W/(m·K)
4.2 Subscripts
For the purposes of this document, the subscripts given in ISO 52000-1, Clause 4 and Annex C and the
following apply.
Subscript Term Subscript Term Subscript Term
a air i internal s sunlit
b building i internal sources sens sensible
c convection, convec- i,j,k indexes sol solar
tive
c contact with air layer in entering, inlet sa solar to air
a
C cooling int internal sh shaded
cd conduction lat latent sk sky
a
DHU dehumidification ld load sl solar loss
dif diffuse lr long-wave radiation sup supply
dir direct m mechanical ventilation th thermal
d distribution me medium t time
d discharge mr mean radiant tb thermal bridge
a
e external or outdoor n normal to surface T thermal
eq equivalent nd need V ventilation
f floor op operative v velocity
a
Type of energy use.
4 © ISO 2017 – All rights reserved

ISO 52017-1:2017(E)
Subscript Term Subscript Term Subscript Term
g ground p projected w wind
a
H heating r radiation we water evaporation
a
HU humidification s surface X humidification and dehu-
a
midification
a
Type of energy use.
5 Brief description of the method
5.1 Output of the method
This method covers the generic methodology for the transient calculation of the internal thermal
balance in a building. This method can be used to calculate the time series of the internal temperature
and the sensible and latent heat loads.
The time interval of the output is hourly or subhourly.
5.2 General description of the method
The evaluation of the time series of internal temperature, sensible and/or latent heat loads of a building
or building thermal zone involves the solution of a system of equations for the transient heat and
mass transfers between the external and internal environment through the opaque and transparent
elements bounding the building or thermal zone envelope, as a function of internal and external heat
flow, temperature and moisture conditions.
6 Calculation method
6.1 Output data
The output data of this method are listed in Table 2. It depends on the application which data are input
and which data are output.
Table 2 — Output data of this method; time series, calculated quantities
c
Description Symbol Unit Validity Intended Varying
a
interval destination
b
module
In case the sensible heating and cooling load is given as input or equals zero:
d
Indoor air temper- θ °C 0 to 50 N.A. YES
int;a
ature
d
Internal surface Θ °C 0 to 50 N.A. YES
s
temperature of
each building
element
d
Mean radiant tem- θ °C 0 to 50 N.A. YES
int;mr
perature
NOTE For example, the EPB standards under the EPB modules M2–2 and M2–3 are based on this reference calculation
procedure and produce output for other EPB modules.
a
Practical range, informative.
b
Informative.
c
“Varying”: value may vary over time: different values per time interval, for instance: hourly values or monthly values
(not constant values over the year).
d
EPB module. Not applicable in this document because this is a reference calculation procedure.
ISO 52017-1:2017(E)
Table 2 (continued)
c
Description Symbol Unit Validity Intended Varying
a
interval destination
b
module
d
Operative temper- θ °C 0 to 50 N.A. YES
int;op
ature
In case internal moisture production and moisture supply are given as input or equal zero:
d
Moisture content x kg /kg 0 to ∞ N.A. YES
int;a H2O
(dry air)
In case indoor temperature set points are given:
d
(Sensible) heating Φ W -∞ to ∞ N.A. YES
HC;ld
and cooling load
In case indoor moisture set points are given:
d
humidification and G kg /s -∞ to ∞ N.A. YES
(D)HU;ld H2O
dehumidification
moisture load
NOTE For example, the EPB standards under the EPB modules M2–2 and M2–3 are based on this reference calculation
procedure and produce output for other EPB modules.
a
Practical range, informative.
b
Informative.
c
“Varying”: value may vary over time: different values per time interval, for instance: hourly values or monthly values
(not constant values over the year).
d
EPB module. Not applicable in this document because this is a reference calculation procedure.
6.2 Calculation time interval and calculation period
The method in this document is suitable for an hourly or subhourly time interval.
The length of the calculation period depends on the application.
6.3 Input data
The method in this document is a generic method intended for use by specialists to develop and/or
validate methods for the hourly or subhourly calculation of the internal temperature.
The input data for this method are listed in Table 3. It depends on the application which data are input
and which data are output.
Table 3 — Input data for this method; time series
Validity
b c
Name Symbol Unit Origin Varying
a
interval
In case the loads are the output:
d
Operative temperature θ °C 0 to 50 N.A. YES
int;op
(e.g. set points)
d
Moisture content x k /kg 0 to ∞ N.A. YES
int;a gH20
(dry air)
(e.g. set points)
a
Practical range, informative.
b
For instance, EPB module or (e.g. product) standard or “local” (type, geometry).
c
“Varying”: value may vary over time: different values per time interval, for instance: hourly values
or monthly values (not constant values over the year).
d
The details are given in the application standards, such as ISO 52016-1.
6 © ISO 2017 – All rights reserved

ISO 52017-1:2017(E)
Table 3 (continued)
Validity
b c
Name Symbol Unit Origin Varying
a
interval
In case the internal temperature resp. moisture content are the output:
d
(Sensible) heating and Φ W -∞ to ∞ N.A. YES
HC;ld
cooling load
d
humidification and dehu- G kg /s -∞ to ∞ N.A. YES
(D)HU;ld H20
midification
moisture load
General:
Geometrical data See 6.4. Because the calculation procedures are generic, these
d
input data cannot be specified in detail .
Thermo-physical param- See 6.4. Because the calculation procedures are generic, these
d
eters of the building and input data cannot be specified in detail .
building elements
Operating and boundary See 6.4. Because the calculation procedures are generic, these
d
conditions input data cannot be specified in detail .
Constants and physical See 6.4. Because the calculation procedures are generic, these
d
data input data cannot be specified in detail .
a
Practical range, informative.
b
For instance, EPB module or (e.g. product) standard or “local” (type, geometry).
c
“Varying”: value may vary over time: different values per time interval, for instance: hourly values
or monthly values (not constant values over the year).
d
The details are given in the application standards, such as ISO 52016-1.
Hourly climatic data shall be obtained from ISO 52010-1.
6.4 Calculation procedure
6.4.1 Applicable time interval
This procedure can be used with an hourly or subhourly time interval.
6.4.2 Assumptions
General assumptions for the calculation of the internal temperatures are the following:
— the air temperature is uniform throughout the building zone;
— the various surfaces of the building elements are isothermal;
— the heat conduction through the building elements (excluding to the ground) is assumed to be one-
dimensional;
— the heat conduction to the ground through building elements is treated by an equivalent one-
dimensional heat flow rate according to ISO 13370;
— the heat storage contribution of (linear or point) thermal bridges is neglected;
— (linear or point) thermal bridges are directly thermally coupled to the internal and outdoor air
temperatures;
— air spaces are treated as air layers bounded by two isothermal and parallel surfaces;
— the heat storage effects in the various planes of a glazed element are neglected;
ISO 52017-1:2017(E)
— the density of heat flow rate due to the short-wave radiation absorbed by each plane of a glazed
element is treated as a source term.
6.4.3 Calculation of relevant temperatures
6.4.3.1 Operative temperature
The internal operative temperature is calculated according to Formula (1):
θθ=⋅ff+−1 ⋅θ (1)
()
int;op aint;a aint;mr
where
θ is the internal operative temperature, in °C;
int;op
f is the fraction that the air temperature contributes to the operative temperature;
a
θ is the temperature of the internal air, calculated according to 6.4.3.2, in °C;
int;a
θ is the internal mean radiant temperature, the weighted average of internal surface tem-
int;mr
peratures, in °C, calculated according to Formula (2):
A ⋅θ
()
∑
jjs,
j
θ = (2)
int;mr
A
∑
j
j
where
θ is the internal surface temperature of building element j, calculated according to 6.4.3.3, in °C;
s,j
A is the area of building element j, in m .
j
6.4.3.2 Sensible heat balance equation and inte
...