Paints and varnishes - Determination of solar reflectance (ISO 22969:2019)

This document specifies a method to determine the solar reflectance of coating systems using a spectrophotometer with a wide spectral range (300 nm to 2 500 nm) and global solar radiation.
This document is applicable to coating systems.

Beschichtungsstoffe - Bestimmung der solaren Reflexion (ISO 22969:2019)

Peintures et vernis - Détermination de réflexion solaire (ISO 22969:2019)

Barve in laki - Določanje odboja sončne svetlobe (ISO 22969:2019)

General Information

Status
Published
Public Enquiry End Date
01-Oct-2020
Publication Date
27-Jan-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
11-Jan-2021
Due Date
18-Mar-2021
Completion Date
28-Jan-2021

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SLOVENSKI STANDARD
SIST EN ISO 22969:2021
01-marec-2021
Barve in laki - Določanje odboja sončne svetlobe (ISO 22969:2019)
Paints and varnishes - Determination of solar reflectance (ISO 22969:2019)
Beschichtungsstoffe - Bestimmung der solaren Reflexion (ISO 22969:2019)
Peintures et vernis - Détermination de réflexion solaire (ISO 22969:2019)
Ta slovenski standard je istoveten z: EN ISO 22969:2020
ICS:
87.040 Barve in laki Paints and varnishes
SIST EN ISO 22969:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 22969:2021
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SIST EN ISO 22969:2021
EN ISO 22969
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2020
EUROPÄISCHE NORM
ICS 87.040
English Version
Paints and varnishes - Determination of solar reflectance
(ISO 22969:2019)

Peintures et vernis - Détermination de réflexion solaire Beschichtungsstoffe - Bestimmung des solaren

(ISO 22969:2019) Reflexionsgrades (ISO 22969:2019)
This European Standard was approved by CEN on 11 December 2020.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 22969:2020 E

worldwide for CEN national Members.
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SIST EN ISO 22969:2021
EN ISO 22969:2020 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 22969:2021
EN ISO 22969:2020 (E)
European foreword

The text of ISO 22969:2019 has been prepared by Technical Committee ISO/TC 35 "Paints and

varnishes” of the International Organization for Standardization (ISO) and has been taken over as

EN ISO 22969:2020 by Technical Committee CEN/TC 139 “Paints and varnishes” the secretariat of

which is held by DIN.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by June 2021, and conflicting national standards shall be

withdrawn at the latest by June 2021.

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.

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, France, Germany, Greece, Hungary, Iceland,

Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the

United Kingdom.
Endorsement notice

The text of ISO 22969:2019 has been approved by CEN as EN ISO 22969:2020 without any modification.

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SIST EN ISO 22969:2021
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SIST EN ISO 22969:2021
INTERNATIONAL ISO
STANDARD 22969
First edition
2019-07
Paints and varnishes — Determination
of solar reflectance
Peintures et vernis — Détermination de réflexion solaire
Reference number
ISO 22969:2019(E)
ISO 2019
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SIST EN ISO 22969:2021
ISO 22969:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019

All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
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SIST EN ISO 22969:2021
ISO 22969:2019(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Apparatus ..................................................................................................................................................................................................................... 2

4.1 Spectrophotometer ............................................................................................................................................................................. 2

5 Procedure..................................................................................................................................................................................................................... 2

5.1 Spectral reflectance of test specimen .................................................................................................................................. 2

5.2 Reference global solar radiation .............................................................................................................................................. 2

5.3 Determination of solar reflectance ........................................................................................................................................ 3

6 Test report ................................................................................................................................................................................................................... 3

Annex A (informative) The reference global radiation table ...................................................................................................... 4

Annex B (informative) Example of a determination method of solar reflectance.................................................8

Bibliography .............................................................................................................................................................................................................................14

© ISO 2019 – All rights reserved iii
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SIST EN ISO 22969:2021
ISO 22969:2019(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 of 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 www .iso

.org/iso/foreword .html.

This document was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee

SC 9, General test methods for paints and varnishes.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/members .html.
iv © ISO 2019 – All rights reserved
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SIST EN ISO 22969:2021
ISO 22969:2019(E)
Introduction

The solar reflectance property of a coating system is determined by the absorbed solar energy

(especially heat) of a building or an object.

This property can be expressed by a numerical value determined by calculation, thanks to which the

impact of solar energy (especially heat) on the environment can be easily understood.

Reduction of greenhouse gases and carbon dioxide (CO ) is achieved by reflecting the solar energy back

into the atmosphere, which, reduces global warming. The effect of energy saving by coating system can

be determined using solar reflectance.
© ISO 2019 – All rights reserved v
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SIST EN ISO 22969:2021
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SIST EN ISO 22969:2021
INTERNATIONAL STANDARD ISO 22969:2019(E)
Paints and varnishes — Determination of solar reflectance
1 Scope

This document specifies a method to determine the solar reflectance of coating systems using a

spectrophotometer with a wide spectral range (300 nm to 2 500 nm) and global solar radiation.

This document is applicable to coating systems.
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 3270, Paints and varnishes and their raw materials — Temperatures and humidities for conditioning

and testing
ISO 4618, Paints and varnishes — Terms and definitions
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 4618 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
global solar radiation

total of the direct solar radiation incident on a horizontal surface plus all sky and horizontal ground

reflected radiation within the 2π steradian field of view of the surface
Note 1 to entry: It is expressed in watts per square metre (W·m ).
3.2
radiant flux
radiant power
power emitted, transmitted or received in the form of radiation
Note 1 to entry: It is expressed in watts (W).
[SOURCE: IEC 60050-845:1987, 845-01-24]
3.3
reflectance

ratio of the reflected radiant or luminous flux to the incident flux in the given spectral composition,

polarization and geometrical distribution
[SOURCE: IEC 60050-845:1987, 845-04-58]
© ISO 2019 – All rights reserved 1
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SIST EN ISO 22969:2021
ISO 22969:2019(E)
3.4
solar reflectance
total solar reflectance
TSR
solar reflectance index
SRI

ratio of reflected radiant flux to global solar radiation (3.1) on coating system

3.5
integrating sphere

hollow sphere whose internal surface is a diffuse reflector, as non-selective as possible

Note 1 to entry: An integrating sphere is frequently used with a radiometer or photometer.

[SOURCE: IEC 60050-845:1987, 845-05-24]
3.6
spectrophotometer

instrument for measuring the ratio of two values of a radiometric quantity at the same wavelength

[SOURCE: IEC 60050-845:1987, 845-05-08]
4 Apparatus
4.1 Spectrophotometer

Spectrophotometer with a spectrometer capable of collecting radiations from 300 nm to 2 500 nm

utilizing an integrating sphere with either 8°:di or di:8° geometry so that the regular or specular

reflection may be included. See CIE 15 for details.
5 Procedure
5.1 Spectral reflectance of test specimen

Measurement of spectral reflectance of test specimens shall use the apparatus described in Clause 4

and the scale used for reflectometers shall be traceable to national metrology institutions. Unless

otherwise specified, spectral reflectance is measured from 300 nm to 2 500 nm and sampling interval

is 5 nm.

The test specimens shall be measured at the standard conditions, a temperature of (23 ± 2) °C and a

relative humidity of (50 ± 5) %, as specified in ISO 3270. If the alternative conditions are used, it shall

be stated in the test report.
5.2 Reference global solar radiation

Reference global solar radiation as defined by the SMARTS 2.9.5 model shall be used. The parameters

of reference global solar radiation are: at sea level for air mass, 1,0; aerosol optical depth, 0,10; water

vapor, 1,42 atm-cm; ozone, 0,340 atm-cm. The reference global solar radiation from 300 nm to 2 500 nm

for 5 nm interval is described in Annex A. If the parameter to calculate reference global solar radiation

is different, it shall be reported.

NOTE SMARTS 2.9.5 is a free software. It can be downloaded from the following website: https: //www .nrel

.gov/grid/solar -resource/smarts .html
2 © ISO 2019 – All rights reserved
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SIST EN ISO 22969:2021
ISO 22969:2019(E)
5.3 Determination of solar reflectance

Solar reflectance is determined by the spectral reflectance of test specimen and the reference global

solar radiation using Formula (1):
∫ Edλρ⋅ λλ
() ()
ρ = (1)
∫ Edλλ
where
ρ is the solar reflectance;
−2 −1
E(λ) is the reference global solar radiation (W∙m ∙nm );
ρ(λ) is the spectral reflectance of specimen;
λ is the range of wavelength from λ to λ .
1 2

NOTE In case of the wavelength interval is 1 nm instead of 5 nm, the formula becomes as follows:

λ λ
2 2
ρλ= EE()⋅ρλ()/ ()λ
λ λ
1 1
Example of a determination of solar reflectance is shown in Annex B.
6 Test report
Test report shall include the followings.
a) a reference to this document, i.e. ISO 22969:2019;
b) a description of test specimen;
c) the type of spectrophotometer;
d) the reflection measurement geometry;

e) the spectral wavelength range and measuring wavelength increments band width and nm-steps

used to scan;
f) the spectral reflectance of test specimen;
g) the solar reflectance;
h) any deviation from the test procedure specified;
i) any unusual features observed;
j) the date of the test.
© ISO 2019 – All rights reserved 3
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SIST EN ISO 22969:2021
ISO 22969:2019(E)
Annex A
(informative)
The reference global radiation table

Reference global solar radiation at sea level for air mass 1,0; aerosol optical depth 0,10; water vapor

1,42 atm-cm; ozone 0,340 atm-cm is described in Table A.1.
Table A.1 — The table of reference global radiation
Wave- Wave- Wave-
Irradiance Irradiance Irradiance Wavelength Irradiance
length length length
−2 −1 −2 −1 −2 −1 −2 −1
nm W·m ·nm nm W·m ·nm nm W·m ·nm nm W·m ·nm
300 1,48E-02 440 1,72E+00 580 1,66E+00 720 1,14E+00
305 7,65E-02 445 1,83E+00 585 1,66E+00 725 1,15E+00
310 1,89E-01 450 1,93E+00 590 1,57E+00 730 1,16E+00
315 3,11E-01 455 1,94E+00 595 1,59E+00 735 1,24E+00
320 4,24E-01 460 1,96E+00 600 1,59E+00 740 1,24E+00
325 5,70E-01 465 1,94E+00 605 1,60E+00 745 1,26E+00
330 7,22E-01 470 1,91E+00 610 1,59E+00 750 1,25E+00
335 7,10E-01 475 1,93E+00 615 1,55E+00 755 1,23E+00
340 7,56E-01 480 1,95E+00 620 1,55E+00 760 8,01E-01
345 7,48E-01 485 1,82E+00 625 1,51E+00 765 8,25E-01
350 7,93E-01 490 1,84E+00 630 1,50E+00 770 1,14E+00
355 8,21E-01 495 1,87E+00 635 1,52E+00 775 1,17E+00
360 7,79E-01 500 1,82E+00 640 1,51E+00 780 1,16E+00
365 9,43E-01 505 1,82E+00 645 1,49E+00 785 1,14E+00
370 9,90E-01 510 1,80E+00 650 1,47E+00 790 1,11E+00
375 9,24E-01 515 1,71E+00 655 1,40E+00 795 1,10E+00
380 9,70E-01 520 1,71E+00 660 1,42E+00 800 1,09E+00
385 8,45E-01 525 1,75E+00 665 1,43E+00 805 1,08E+00
390 9,89E-01 530 1,78E+00 670 1,45E+00 810 1,06E+00
395 9,29E-01 535 1,77E+00 675 1,45E+00 815 9,46E-01
400 1,40E+00 540 1,74E+00 680 1,42E+00 820 9,21E-01
405 1,53E+00 545 1,75E+00 685 1,35E+00 825 9,43E-01
410 1,56E+00 550 1,75E+00 690 1,26E+00 830 9,48E-01
415 1,63E+00 555 1,74E+00 695 1,32E+00 835 9,80E-01
420 1,62E+00 560 1,69E+00 700 1,33E+00 840 1,00E+00
425 1,59E+00 565 1,68E+00 705 1,34E+00 845 9,98E-01
430 1,44E+00 570 1,65E+00 710 1,35E+00 850 9,55E-01
435 1,61E+00 575 1,66E+00 715 1,28E+00 855 9,21E-01
4 © ISO 2019 – All rights reserved
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SIST EN ISO 22969:2021
ISO 22969:2019(E)
Table A.1 (continued)
Wave- Wave- Wave-
Irradiance Irradiance Irradiance Wavelength Irradiance
length length length
−2 −1 −2 −1 −2 −1 −2 −1
nm W·m ·nm nm W·m ·nm nm W·m ·nm nm W·m ·nm
860 9,77E-01 1 035 6,67E-01 1 210 4,31E-01 1 385 4,11E-04
865 9,42E-01 1 040 6,62E-01 1 215 4,43E-01 1 390 1,88E-03
870 9,56E-01 1 045 6,53E-01 1 220 4,48E-01 1 395 1,06E-03
875 9,46E-01 1 050 6,48E-01 1 225 4,46E-01 1 400 3,26E-03
880 9,33E-01 1 055 6,40E-01 1 230 4,50E-01 1 405 4,44E-03
885 9,21E-01 1 060 6,26E-01 1 235 4,51E-01 1 410 8,15E-03
890 9,09E-01 1 065 6,20E-01 1 240 4,48E-01 1 415 2,29E-02
895 8,09E-01 1 070 6,07E-01 1 245 4,44E-01 1 420 2,69E-02
900 6,97E-01 1 075 6,05E-01 1 250 4,40E-01 1 425 4,24E-02
905 7,57E-01 1 080 5,94E-01 1 255 4,32E-01 1 430 5,51E-02
910 6,93E-01 1 085 5,80E-01 1 260 4,17E-01 1 435 4,78E-02
915 6,83E-01 1 090 5,71E-01 1 265 3,91E-01 1 440 5,99E-02
920 7,29E-01 1 095 5,37E-01 1 270 3,80E-01 1 445 7,21E-02
925 7,20E-01 1 100 5,11E-01 1 275 4,07E-01 1 450 8,59E-02
930 5,10E-01 1 105 4,83E-01 1 280 4,00E-01 1 455 1,27E-01
935 2,82E-01
...

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