ISO 22975-4:2023

Solar energy — Collector components and materials — Part 4: Glazing material durability and performance

This document specifies definitions and test methods for glazing material durability and performance. This document is applicable to those collectors having a glazing to fit sheets or tubes of glass into collectors; accordingly, soda lime silicate glass and borosilicate glass are used. This document is applicable to solar transmittance of glass for solar collector.

Energie solaire — Composants et matériaux du capteur — Partie 4: Durabilité et performance des matériaux de vitrage

General Information

• Status: Published
• Publication Date: 01-Aug-2023
• ICS: 27.160 - Solar energy engineering
• Technical Committee: ISO/TC 180 - Solar energy
• Drafting Committee: ISO/TC 180/WG 3 - Collector components and materials
• Current Stage: 6060 - International Standard published
• Start Date: 31-Jul-2023
• Due Date: 14-Jun-2023
• Completion Date: 02-Aug-2023

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 22975-4
First edition
2023-07
Solar energy — Collector components
and materials —
Part 4:
Glazing material durability and
performance
Energie solaire — Composants et matériaux du capteur —
Partie 4: Durabilité et performance des matériaux de vitrage
Reference number
ISO 22975-4:2023(E)
© ISO 2023

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ISO 22975-4:2023(E)
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© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
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ISO 22975-4:2023(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Classification of solar glass. 2
4.1 General . 2
4.2 Solar transmittance of untreated glass . 2
4.3 Solar transmittance of single-side AR treated glass . 2
4.4 Solar transmittance of double-side AR treated glass . 2
5 Test methods for assessing material optical property of the glass .3
5.1 Preparation of test specimens . 3
5.2 Measurements of solar transmittance . 3
6 Tests for assessing the thermal stability of the glass . 3
6.1 Apparatus . 3
6.1.1 Hot oven . 3
6.1.2 Cold bath . 3
6.1.3 Basket . 3
6.2 Specimens . 3
6.2.1 Flat plate glass . 3
6.2.2 Tube glass. 4
6.3 Procedure . 4
6.3.1 Ambient temperature. 4
6.3.2 The hot oven . 4
6.3.3 The cold bath . 4
6.3.4 Heating the specimens . 4
6.3.5 Cooling the specimens . 4
6.3.6 Results . 4
7 Thermal shock resistance . .4
7.1 Test specimens. 4
7.2 Temperature difference . 4
7.3 Pass the test . 4
7.4 Progressive test . 5
7.5 High-level test . 5
8 Thermal shock endurance .5
9 Report . 5
Annex A (normative) Assessment of solar transmittance of solar glass. 6
Annex B (Informative) General characteristics of glass materials . 7
Bibliography . 9
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ISO 22975-4:2023(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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use
of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO had not received
notice of (a) patent(s) which may be required to implement this document. However, implementers are
cautioned that this may not represent the latest information, which may be obtained from the patent
database available at  www.iso.org/patents. ISO shall not be held responsible for identifying any or all
such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
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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 180, Solar Energy.
A list of all parts in the ISO 22975 series can be found on the ISO website.
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.
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INTERNATIONAL STANDARD ISO 22975-4:2023(E)
Solar energy — Collector components and materials —
Part 4:
Glazing material durability and performance
1 Scope
This document specifies definitions and test methods for glazing material durability and performance.
This document is applicable to those collectors having a glazing to fit sheets or tubes of glass into
collectors; accordingly, soda lime silicate glass and borosilicate glass are used.
This document is applicable to solar transmittance of glass for solar collector.
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 9488, Solar energy — Vocabulary
ISO 22975-1, Solar energy — Collector components and materials — Part 1: Evacuated tubes — Durability
and performance
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 9488, ISO 22975-1 and the
following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org
3.1
specimen
general term applied to test glass samples of flat plate and tube
3.2
solar transmittance
τ
s
fraction of solar radiation energy transmitted by a piece of glass in the solar energy wavelength range
of 0,3 μm to 2,5 μm for air mass 1,5 (AM1,5)
3.3
solar glass
transmittance of a piece of glass without treatment above 0,850 for air mass 1,5 (AM1,5) is call
...