prEN 17871
(Main)Glass in building - Spectrophotometric characteristics of glass products - Validation procedure for calculation tool.
Glass in building - Spectrophotometric characteristics of glass products - Validation procedure for calculation tool.
This standard provides a procedure to validate a calculation tool of spectrophotometric and thermal characteristics of the glass products following EN 410 or EN 673. It provides also the methodology to correctly use measured data in the calculation tool.
The following characteristics are included in the scope of this standard:
- light transmittance (tv)
- light reflectance - both sides (rv, r'v)
- solar direct transmittance (te)
- solar direct reflectance – both sides (re, r'e)
- total solar energy transmittance (solar factor or g value) (g)
- thermal transmittance (U value) in the vertical position
The following characteristics are excluded from the scope of this standard:
- UV transmittance (tuv)
- shading coefficient (SC)
- general colour rendering index (Ra)
- thermal transmittance (U value) at angles other than vertical
Glas im Bauwesen - Spektralphotometrische Eigenschaften von Glasprodukten - Validierungsverfahren für das Berechnungstool
Dieses Dokument liefert ein Verfahren zur Validierung eines Berechnungstools für spektralphotometrische und thermische Eigenschaften von Glaserzeugnissen nach EN410 oder EN673. Es liefert zudem die Methodik für eine korrekte Verwendung von Messdaten im Berechnungstool.
Die folgenden Eigenschaften liegen im Anwendungsbereich dieses Dokuments:
- Lichttransmissionsgrad (tv);
- Lichtreflexionsgrad–beidseitig (rv, r’v);
- direkter Strahlungstransmissionsgrad (te);
- direkter Strahlungsreflexionsgrad–beidseitig (re, r’e);
- Gesamtenergiedurchlassgrad (Sonnenfaktor oder g-Wert) (g);
- Wärmedurchgangskoeffizient (U-Wert) in der aufrechten Position.
Die folgenden Eigenschaften liegen außerhalb des Anwendungsbereiches dieses Dokuments:
- UV-Transmissionsgrad (tuv);
- mittlerer Durchlassfaktor (SC, en: shading coefficient);
- allgemeiner Farbwiedergabeindex (Ra);
- Wärmedurchgangskoeffizient (U-Wert) in anderen Winkeln als der aufrechten Position.
Verre dans la construction - Caractéristiques spectrophotométriques des produits verriers - Mode opératoire de validation pour l’outil de calcul
Le présent document fournit un mode opératoire pour valider un outil de calcul des caractéristiques spectrophotométriques et thermiques des produits verriers, conformément à l'EN 410 ou à l'EN 673. Il fournit également la méthodologie pour utiliser correctement les données mesurées dans l’outil de calcul.
Les caractéristiques suivantes sont incluses dans le domaine d’application du présent document :
⎯ facteur de transmission lumineuse (tv)
⎯ facteur de réflexion lumineuse, des deux côtés (rv, r’v)
⎯ facteur de transmission directe de l’énergie solaire (te)
⎯ facteur de réflexion directe de l’énergie solaire, des deux côtés (re, r’e)
⎯ facteur de transmission totale de l’énergie solaire (facteur solaire ou valeur g) (g)
⎯ coefficient de transmission thermique (valeur U) en position verticale
Les caractéristiques suivantes ne sont pas incluses dans le domaine d’application du présent document :
⎯ facteur de transmission de l’ultraviolet (tuv)
⎯ coefficient d’ombrage (SC)
⎯ indice général de rendu des couleurs (Ra)
⎯ coefficient de transmission thermique (valeur U) à des angles autres que la verticale
Steklo v gradbeništvu - Spektrofotometrične značilnosti steklenih izdelkov - Validacijski postopek za računsko orodje
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN 17871:2023
01-januar-2023
Steklo v gradbeništvu - Spektrofotometrične značilnosti steklenih izdelkov -
Validacijski postopek za računsko orodje
Glass in building - Spectrophotometric characteristics of glass products - Validation
procedure for calculation tool
Glas im Bauwesen - Spektralphotometrische Eigenschaften von Glasprodukten -
Validierungsverfahren für das Berechnungstool
Verre dans la construction - Caractéristiques spectrophotométriques des produits
verriers - Mode opératoire de validation pour l’outil de calcul
Ta slovenski standard je istoveten z: prEN 17871
ICS:
81.040.20 Steklo v gradbeništvu Glass in building
oSIST prEN 17871:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 17871:2023
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oSIST prEN 17871:2023
DRAFT
EUROPEAN STANDARD
prEN 17871
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2022
ICS 81.040.20
English Version
Glass in building - Spectrophotometric characteristics of
glass products - Validation procedure for calculation tool.
Verre dans la construction - Caractéristiques Glas im Bauwesen - Spektralphotometrische
spectrophotométriques des produits verriers - Mode Eigenschaften von Glasprodukten -
opératoire de validation pour l'outil de calcul Validierungsverfahren für das Berechnungstool
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 129.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, 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, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17871:2022 E
worldwide for CEN national Members.
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prEN 17871:2022(E)
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Validation procedure. 6
4.1 General outline . 6
4.2 Choice of the reference products and data . 6
4.3 Reference calculation program . 10
4.4 Calculation program to be validated . 10
4.5 Comparison procedure . 10
4.6 Difference criteria . 11
4.7 Calculation tool update validation . 11
4.8 Report content . 11
Bibliography . 12
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prEN 17871:2022 (E)
European foreword
This document (prEN 17871:2022) has been prepared by Technical Committee CEN/TC 129 “Glass in
building”, the secretariat of which is held by NBN.
This document is currently submitted to the CEN Enquiry.
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prEN 17871:2022(E)
Introduction
EN 410 is in part a measurement standard and in part a calculation standard. EN 673 is a calculation
method based on input of the emissivity according to EN 12898. The Annex ZAs of the harmonized
standards for glass assign the initial determination of both radiation and thermal properties as tasks for
a notified laboratory (AVCP system 3).
Under AVCP system 3, a notified laboratory has to perform a type test (TT) to determine the
spectrophotometric and thermal characteristics of the glass product. However, when some
characteristics have to be calculated (e.g. U value, g value, other glass thicknesses, other glass
substrates…) the manufacturer shall be allowed to undertake the calculation according to the relevant
standards. In this case, the calculation tool shall be validated by a notified laboratory and provide a report
according to this standard.
The purpose of this standard is to cover only those energy conservation and heat retention characteristics
that are stated on the Declaration of Performance under the EU Regulation 305/2011, namely:
— thermal properties
— radiation properties: light transmittance and reflectance
— radiation properties: solar energy characteristics
Characteristics other than the above are not covered as they are not required for the Declaration of
Performance.
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prEN 17871:2022 (E)
1 Scope
This document provides a procedure to validate a calculation tool of spectrophotometric and thermal
characteristics of the glass products following EN 410 or EN 673. It provides also the methodology to
correctly use measured data in the calculation tool.
The following characteristics are included in the scope of this document:
)
— light transmittance (tv
— light reflectance - both sides (r r' )
v, v
— solar direct transmittance (t )
e
— solar direct reflectance – both sides (r r' )
e, e
— total solar energy transmittance (solar factor or g value) (g)
— thermal transmittance (U value) in the vertical position
The following characteristics are excluded from the scope of this document:
— UV transmittance (t )
uv
— shading coefficient (SC)
— general colour rendering index (Ra)
— thermal transmittance (U value) at angles other than vertical
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.
EN 410:2011, Glass in building - Determination of luminous and solar characteristics of glazing
EN 673:2011, Glass in building - Determination of thermal transmittance (U value) - Calculation method
EN 12898:2019, Glass in building - Determination of the emissivity
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 410, EN 673 and EN 12898 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
applicant
party that provides the calculation program for validation
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3.2
validator
party that verifies the results of the calculation program following the procedure descried in this
document
Note 1 to entry: Within the framework of the EU Regulation 305/2011, the validator is a notified laboratory
4 Validation procedure
4.1 General outline
The applicant shall provide the validator with access to the calculation program. Results obtained with
the calculation tool to be validated shall be compared by the validator to results obtained with the
reference calculation program of the validator for defined reference products in accordance with 4.2. The
difference shall not exceed the value defined in Clause 4.6.
The reference data for tasks 1 to 15 in Table 1 shall be agreed between the validator and the applicant.
The reference data can be provided by the validator, applicant or Glass for Europe website.
NOTE Reference spectral data that can be used for the purpose of validation can be found on the Glass for
Europe website at: https://glassforeurope.com/spectral-data/.
In the case of reference data obtained from the Glass for Europe website, the applicant and validator
should use the same version (e.g. same date, version number, etc.).
4.2 Choice of the reference products and data
Calculated products shall represent the calculation t
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