SIST EN ISO 52010-1:2017

SLOVENSKI STANDARD
01-september-2017
Energijske lastnosti stavb - Zunanje podnebne razmere - 1. del: Pretvorba
podnebnih podatkov za energetske izračune (ISO 52010-1:2017)
Energy performance of buildings - External climatic conditions - Part 1: Conversion of
climatic data for energy calculations (ISO 52010-1:2017)
Energieeffizienz von Gebäuden - Äußere Umweltbedingungen - Teil 1: Umrechnung von
Wetterdaten als Eingangsgrößen für Energieberechnungen (ISO 52010-1:2017)
Performance énergétique des bâtiments - Conditions climatiques extérieures - Partie 1:
Conversion des données climatiques pour les calculs énergétiques (ISO 52010-1:2017)
Ta slovenski standard je istoveten z: EN ISO 52010-1:2017
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 52010-1
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2017
EUROPÄISCHE NORM
ICS 91.120.10
English Version
Energy performance of buildings - External climatic
conditions - Part 1: Conversion of climatic data for energy
calculations (ISO 52010-1:2017)
Performance énergétique des bâtiments - Conditions Energieeffizienz von Gebäuden - Äußere
climatiques extérieures - Partie 1: Conversion des Umweltbedingungen - Teil 1: Umrechnung von
données climatiques pour les calculs énergétiques (ISO Wetterdaten als Eingangsgrößen für
52010-1:2017) Energieberechnungen (ISO 52010-1:2017)
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 52010-1:2017 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 52010-1:2017) 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.
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.
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 14th
December 2010
Endorsement notice
The text of ISO 52010-1:2017 has been approved by CEN as EN ISO 52010-1:2017 without any
modification.
INTERNATIONAL ISO
STANDARD 52010-1
First edition
2017-06
Energy performance of buildings —
External climatic conditions —
Part 1:
Conversion of climatic data for energy
calculations
Performance énergétique des bâtiments — Conditions climatiques
extérieures —
Partie 1: Conversion des données climatiques pour les calculs
énergétiques
Reference number
ISO 52010-1:2017(E)
©
ISO 2017
ISO 52010-1:2017(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
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ii © ISO 2017 – All rights reserved

ISO 52010-1:2017(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols and abbreviations . 2
4.1 Symbols . 2
4.2 Subscripts . 3
5 Description of the methods . 4
5.1 Output of the method . 4
5.2 General description of the method . 4
6 Calculation method . 5
6.1 Output data . 5
6.2 Calculation time intervals . 7
6.3 Input data . 8
6.3.1 General. 8
6.3.2 Weather station and climatic data set . 8
6.3.3 Climatic input data . 9
6.3.4 Geometrical characteristics . 9
6.3.5 Constants and physical data.10
6.3.6 Input data from Annex A (see Annex B) .11
6.4 Calculation procedure .11
6.4.1 Calculation of the sun path . .12
6.4.2 Split between direct and diffuse solar irradiance .16
6.4.3 Solar reflectivity of the ground .18
6.4.4 Calculation of the total solar irradiance at given orientation and tilt angle .18
6.4.5 Calculation of shading by external objects .22
6.4.6 Calculation of illuminance .25
7 Quality control .26
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 .31
Bibliography .35
ISO 52010-1:2017(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 52010-1 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).
A list of all the parts in the ISO 52010 series can be found on the ISO website.
iv © ISO 2017 – All rights reserved

ISO 52010-1:2017(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.
[6]
More information is provided in the technical report (ISO/TR 52010-2 ) accompanying this document.
The subset of EPB standards prepared under the responsibility of ISO/TC 163/SC 2, Thermal performance
and energy use in the built environment — Calculation methods, 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 52010-1:2017(E)
— indicators for partial EPB requirements related to thermal energy balance and fabric features; and
— 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 TCs for the details on, for example, appliances, technical
building systems and indoor environment.
This document provides:
— Standard calculation procedures for the conversion of hourly weather data to apply as input for
energy performance calculations, in particular calculation of solar irradiance on an arbitrary
inclined surface.
— Procedures for the use of (other) output from ISO 15927-1, ISO 15927-2, and ISO 15927-4) as input
for the EPB assessment.
Common standard climatic data shall be used for the all relevant EPB modules. Most of the input data
are available from ISO 15927-1, ISO 15927-2, ISO 15927-4, ISO 15927-5 and ISO 15927-6.
These data include the variables per time interval, as described in ISO 52000-1:2017, 11.5.
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.
[7]
NOTE 2 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.
NOTE 3 The modules represent EPB standards, although one EPB standard could cover more than one module
and one module could be covered by more than one EPB standard, for instance a simplified and a detailed method
respectively. See also Tables A.1 and B.1

vi © ISO 2017 – All rights reserved

ISO 52010-1:2017(E)
Table 1 — Position of this document (in casu M1–13), within the modular structure of the set of
EPB standards
Building
Overarching Technical Building Systems
(as such)
Build-
ing
Hu- De- Do-
auto-
Ven- mid- hu- mes-
Descrip- Descrip- Heat- Cool- Light- ma- PV,
Submodule Descriptions tila- ifi mid- tic
tions tions ing ing ing tion wind, .
tion cati- ifica- hot
and
on tion water
con-
trol
sub1 M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M11
1 General General General
Common terms
Building
and definitions;
2 energy Needs a
symbols, units
needs
and subscripts
(Free)
Maxi-
Indoor
mum
3 Applications conditions
load and
without
power
systems
Ways to Ways to
Ways to express express
4 express energy energy energy
performance perfor- perfor-
mance mance
Building Heat
Emission
categories transfer
5 and
and building by trans-
control
boundaries mission
Heat
Building transfer
Distribu-
occupancy by infiltra-
6 tion and
and operating tion and
control
conditions ventila-
tion
Aggregation of
Storage
energy services Internal
7 and
and energy heat gains
control
carriers
Genera-
Solar heat
8 Building zoning tion and
gains
control
Load
Building dispatch-
Calculated
dynamics ing and
9 energy perfor-
(thermal operating
mance
mass) condi-
tions
Meas-
Measured
ured
Measured ener- energy
10 energy
gy performance perfor-
perfor-
mance
mance
Inspec-
11 Inspection Inspection
tion
a
The shaded modules are not applicable.
ISO 52010-1:2017(E)
Table 1 (continued)
Building
Overarching Technical Building Systems
(as such)
Build-
ing
Hu- De- Do-
auto-
Ven- mid- hu- mes-
Descrip- Descrip- Heat- Cool- Light- ma- PV,
Submodule Descriptions tila- ifi mid- tic
tions tions ing ing ing tion wind, .
tion cati- ifica- hot
and
on tion water
con-
trol
sub1 M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M11
Ways to
12 express indoor BMS
comfort
ISO 52010-1
External
13 environment
conditions
Economic
calculation
a
The shaded modules are not applicable.
viii © ISO 2017 – All rights reserved

INTERNATIONAL STANDARD ISO 52010-1:2017(E)
Energy performance of buildings — External climatic
conditions —
Part 1:
Conversion of climatic data for energy calculations
1 Scope
This document specifies a calculation procedure for the conversion of climatic data for energy
calculations.
The main element in this document is the calculation of solar irradiance on a surface with arbitrary
orientation and tilt. A simple method for conversion of solar irradiance to illuminance is also provided.
The solar irradiance and illuminance on an arbitrary surface are applicable as input for energy and
daylighting calculations, for building elements (such as roofs, facades and windows) and for components
of technical building systems (such as thermal solar collectors, PV panels).
Other parameters of climatic data needed to assess the thermal and moisture performance of buildings,
building elements or technical building systems [like wind, temperature, moisture and long-wave
(thermal) radiation] are to be obtained according to the procedures in ISO 15927-4. These data are
listed in this document as input and passed on as output without any conversion.
NOTE 1 The reason for passing these data via this document is to have one single and consistent source for all
EPB standards and to enable any conversion or other treatment if needed for specific application.
NOTE 2 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 9488, Solar energy — Vocabulary
ISO 15927-4, Hygrothermal performance of buildings — Calculation and presentation of climatic data —
Part 4: Hourly data for assessing the annual energy use for heating and cooling
ISO 52000-1, Energy performance of buildings — Overarching EPB assessment — Part 1: General
framework and procedures
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 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).
ISO 52010-1:2017(E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 7345, ISO 9488, ISO 52000-1
and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at http:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
EPB standard
standard that complies with the requirements given in ISO 52000-1, CEN/TS 16628 and 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 (Mandate M/480), and support essential requirements of
EU Directive 2010/31/EU on the energy performance of buildings (EPBD). Several EPB standards and related
documents are developed or revised under the same mandate.
[SOURCE: ISO 52000-1:2017, definition 3.5.14]
3.2
solar declination
angle between direction of the direct solar radiation and the equatorial plane of the earth
3.3
illuminance
quotient of the luminous flux incident on an element of the surface containing
the point, divided by the area of that element
−2
Note 1 to entry: This is expressed in lux, 1 lx = 1 lm·m .
[SOURCE: ISO 16817:2012, 3.14]
4 Symbols and abbreviations
4.1 Symbols
For the purposes of this document, the symbols from ISO 52000-1 and the following apply.
NOTE If, within this document, a symbol is more or less uniquely linked with a specific subscript, the symbol
is shown with the subscript.
Symbol Name of quantity Unit
D wind direction °
f brightness coefficients (Perez model) –
E global illuminance lx
v
F coefficient –
G irradiance W/m
H height m
H (accumulated, monthly) solar irradiation kW h/m
i index –
I calculated irradiance W/m
K Global luminous efficacy lm/W
v
k clearness index –
T
L distance m
2 © ISO 2017 – All rights reserved

ISO 52010-1:2017(E)
Symbol Name of quantity Unit
m air mass –
n number –
R earth orbit deviation °
dc
n index –
t time min, h
TZ time zone h
u wind speed m/s
x moisture content or mixing ratio kg/kg
α angle °
β angle °
γ angle °
δ solar declination °
ε clearness parameter (Perez model) –
θ Celsius temperature °C
θ angle °
λ longitude °
φ relative humidity –
φ angle, latitude °
ρ reflectivity –
ω hour angle °
4.2 Subscripts
For the purposes of this document, the subscripts given in ISO 52000-1 and the following apply.
NOTE Relevant subscripts already given in ISO 52000-1 are included if necessary for the understanding of
this document.
Subscript Term Subscript Term
a atmosphere, air ic surface of any inclination
an annual, yearly l long-wave
b beam m monthly
c constant obst obstacle
circum circumsolar segm segment
d day sol solar, sun
d diffuse sh shading
dif diffuse tot total
dir direct v visual, light
eq equation w weather station
ext extra-terrestrial z zenith
g global 0, 1, … index
grnd ground 11, 12, …. index
ISO 52010-1:2017(E)
5 Description of the methods
5.1 Output of the method
This document covers primarily the generic hourly calculation methodology of the solar irradiance on a
surface of any orientation and tilt, optionally including the effect of shading by distant objects.
To avoid serious errors in case of separate calculation of the effect of shading in case of overlapping
shading objects, it is recommended that the calculation of the effect of shading by external objects
is done in the application standard where the position, location and surroundings of the irradiated
surface is known.
For that purpose the output provides the solar irradiance not only as a total, but also as different
components. Additional output needed for the calculation of the effect of shading in standards using the
output from this document as input is the position of the sun.
The time interval of the output is hourly.
Other data from the climatic data set (not related to solar radiation) do not need any conversion, but can
be used directly in the relevant EPB standards. These are also listed in the table with output quantities.
NOTE The reason for passing these data via this document is to have one single and consistent source for all
EPB standards and to enable any conversion or other treatment if needed for specific application.
5.2 General description of the method
The method gives procedures to calculate the distribution of solar irradiance on a non-horizontal plane
based on hourly solar radiation data on a horizontal surface.
[6]
NOTE The explanation and justification is given in ISO/TR 52010-2 . The model is named after Mr Perez.
Several improvements were made in the course of time, see the list of references in the bibliography of the
technical report. The calculation procedure described in this document is based on the “simplified Perez model”
proposed in the early 1990s.
Essentially, the model is composed of three different components:
a) a geometric representation of the sky dome;
b) a parametric representation of the insolation conditions, and;
c) a statistic component linking both components mentioned before.
It is a model of anisotropic sky, where the sky dome is geometrically divided into three areas, each of
them showing a constant radiance, different from the other two.
These three areas are:
— isotropic diffuse (for the sky hemisphere);
— circumsolar radiation;
— horizon brightness.
For the purposes of this document the following is added:
— isotropic ground reflected radiation.
The diffuse (sky) radiation for the surface uses as input hourly values of diffuse horizontal and direct
beam solar radiation. Other inputs to the model include the sun’s incident angle to the surface, the
surface tilt angle from the horizontal, and the sun’s zenith angle.
4 © ISO 2017 – All rights reserved

ISO 52010-1:2017(E)
Shading by distant objects is taken into account through a shading correction coefficient for the direct
radiation. Shading of diffuse radiation and reflection by distant objects is not taken into account.
Shading by fins and overhangs is calculated in ISO 52016-1. In case of a combination of shading objects,
specified in different standards (like in this document plus in ISO 52016-1), the calculation of the
effect shall not be done separately, because the effects may overlap, leading to double counting. For
that reason this document gives as output the choice between unshaded and shaded solar radiation.
The (combined) effect of shading objects can be done in the application standard, such as ISO 55016-1
for the heating and cooling needs, design load or indoor temperature; or e.g. in standards assessing
the energy performance of thermal solar collectors, photovoltaic panels in the built environment. Such
standards contain all the details of the assessed object and of the surroundings.
6 Calculation method
6.1 Output data
The output data of this method are listed in Tables 2 to 4.
The general data needed when the climatic data set is used as input in other standards are given in
Table 2.
The calculated total solar irradiance is provided without and with the effect of solar shading by external
objects (see 6.4.3).
The solar position (altitude and azimuth) is needed as input for solar shading calculations, after the
calculation of the irradiance according to this document. For the same purpose the output is split into
direct and diffuse irradiance. The direct and diffuse solar irradiance can be divided in two sets: one set
without and one set with a correction for circumsolar irradiance. See Table 3.
Other data from the climatic data set (not related to solar radiation) do not need any conversion, but can
be used directly in the relevant EPB standards. These are listed in Table 4.
Table 2 — Output data of this method; climatic data file
c
Description Symbol Unit Validity Intended Varying
a
interval destination
b
module
Identifier for cli- - (text) text M9–2 M2–3, No
matic data file M3–3, M4–3,
M5–3, M6–3,
M7–3, M9–3
M11-X
First day of time n - 1 to 366 Same No
day;start
series (day of the
year)
Last day of time n - 1 to 366 Same No
day;end
series (day of the
year)
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
If Yes: additional information to be added.
ISO 52010-1:2017(E)
Table 2 (continued)
c
Description Symbol Unit Validity Intended Varying
a
interval destination
b
module
Day of the week - Monday to Same No
for first day Sunday (day 1
to 7)
Daylight saving - - Yes/No Same No
time in time se-
d
ries?
Leap day included? - - Yes/No Same No
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
If Yes: additional information to be added.
Table 3 — Output data of this method; time series, calculated quantities
c
Description Symbol Unit Validity Intended Varying
a
interval destination
b
module
Day of the year n – 1 to 366 M9–2 M2–3, Yes
day
M3–3, M4–3,
M5–3, M6–3,
M7–3, M9–3
M11-X
Actual (clock) n – 1 to 24 Same Yes
hour
hour for the
location (counting
number of the
hour in the day)
Calculated diffuse I W/m 0 to 1 300 Same Yes
dif
solar irradiance
Calculated diffuse I W/m 0 to 1 300 Same Yes
dif;tot
solar irradiance
excluding circum-
solar irradiance
Calculated direct I W/m 0 to 1 300 Same Yes
dir
solar irradiance
Calculated direct I W/m 0 to 1 300 Same Yes
dir;tot
solar irradiance
including circum-
solar irradiance
Calculated hem- I W/m 0 to 1 300 Same Yes
tot
ispherical solar
irradiance
Calculated global E lx 0 to 150 000 Same Yes
v
illuminance
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
Convention in this document: angle from South, eastwards positive, westwards negative.
NOTE For aggregation over a longer period: see 6.2.
6 © ISO 2017 – All rights reserved

ISO 52010-1:2017(E)
Table 3 (continued)
c
Description Symbol Unit Validity Intended Varying
a
interval destination
b
module
Calculated hemi- I W/m 0 to 1 300 Same Yes
tot;sh
spherical solar ir-
radiance, including
effect of shading
Solar altitude α ° 0 to 90
sol
angle, from hori-
zontal
Solar azimuth φ ° −180 to +180
sol
d
angle
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
Convention in this document: angle from South, eastwards positive, westwards negative.
NOTE For aggregation over a longer period: see 6.2.
Table 4 — Output data of this method; time series, other climatic data
c
Description Symbol Unit Validity Intended Varying
a
interval destination
b
module
Dry-bulb air tem- θ °C −50 to 50 M9–2 M2–3, Yes
a
perature M3–3, M4–3,
M5–3, M6–3,
M7–3, M9–3
M11-X
Wind speed at u m/s 0 to 20 Same Yes
10 m height
Wind direction D ° 0 to– 360 Same Yes
from north
Long-wave irra- G W/m 0 to 500 Same Yes
l;a
diance from the
atmosphere on a
horizontal plane
Moisture content x kg/kg 0 to 0,050 Same Yes
or mixing ratio
Relative humidity φ % 0 to 100 Same Yes
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).
NOTE For aggregation over a longer period: see 6.2.
6.2 Calculation time intervals
The method described in Clause 6 is suitable for hourly time intervals.
ISO 52010-1:2017(E)
If daily, monthly, yearly data are needed they can be aggregated from hourly data by taking the monthly
mean or monthly total values and adding the subscript corresponding with the period (d, m, an). The
number of hours per month can be aggregated in the same way.
NOTE 1 This corresponds to the time intervals needed for energy calculations and the availability of hourly
integrated solar irradiance data. If data on shorter time intervals is available the method can be applied to
shorter time intervals.
[1]
NOTE 2 ISO 15927-1 specifies procedures for calculating and presenting the monthly total or monthly
mean values of those parameters of climatic data needed to assess the overall or partial energy performance of
buildings. But when hourly data are available, as assumed in this document, such calculation is a trivial summing
and averaging.
When the hourly values for the solar irradiance, I , in (W/m ), are summed over a month, they are
x
divided by 1 000 and expressed as the solar irradiation, H , in (kWh/m ), where x is the placeholder for
x
the different irradiance components.
6.3 Input data
6.3.1 General
The basic input data are solar radiation measured at a weather station, coordinates of the weather
station and the orientation and tilt angle of the surface of interest, and the date and time for the
calculation. For shading the height of the surface, the height of the shading object and the distance of
the shading object are also required as input data.
Clause 8 provides procedures for reporting the application range of the time series of climatic data.
The measured solar radiation components that are used in the calculation are the direct beam solar
irradiance and the diffuse horizontal solar irradiance. The basic calculation of ground reflection is
based on the global horizontal radiation which in this document is calculated from the diffuse and
direct beam solar radiance.
When only the global solar radiance is measured at the weather station the diffuse and direct beam
radiance can be estimated according to 6.4.2.
The ground reflection from surroundings of the building location is needed as input data for the
calculation (see 6.4.3).
6.3.2 Weather station and climatic data set
The climatic data are to be obtained in accordance with the procedures in ISO 15927-4.
NOTE 1 See NOTE 2 in 6.2.
[1]
NOTE 2 ISO 15927-1 also contains a few conversions, such as conversion between vapour pressure, relative
humidity and mixing ratio and conversion between reference hourly mean wind speed and local mean wind
speed, that can be of use for specific applications that are described in other EPB standards.
ISO 15927-4 gives a method for constructing a reference year of hourly values of appropriate
meteorological data suitable for assessing the average annual energy for heating and cooling. Other
reference years representing average conditions can be constructed for special purposes.
Meteorological instrumentation and methods of observation are not covered; these are specified by the
World Meteorological Organization (WMO).
The climatic data are measured at main weather stations. Which weather station to use and which time
series is described in Table A.2 (normative template).
8 © ISO 2017 – All rights reserved

ISO 52010-1:2017(E)
For each time series of climatic data a reference to documentation is required that provides background
information on the selection of the time series and the intended application range. See template in
Table A.2.
EXAMPLE Heating and cooling energy (sensible, latent); ventilation and air infiltration; design heating or
cooling load; indoor comfort; thermal solar collectors; wind turbines. Where applicable: indication if it intends to
represent an average or an extreme year.
The report shall also contain information whether the climatic data consist of measured data, pre-
processed measured data or synthetic data, and the method used for pre-processing or constructing
the synthetic data. See template in Table A.2.
An informative default choice of weather station and time series, normally for each EPB standard
provided in Table B.2, is not applicable, because this choice strongly depends on local conditions.
Instead, Table B.2 contains the data from a climatic data set that is internationally widely used for
validation tests, such as the validation and verification tests described in ISO 52016-1.
6.3.3 Climatic input data
Table 5 contains data needed for the calculation of the solar irradiance at an inclined surface.
The calculation method comprises different options. Therefore not all the da
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