EN 17871:2024
(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 - Procédure de validation des outils 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
Ta standard podaja validacijski postopek za računsko orodje v zvezi s spektrofotometričnimi in toplotnimi značilnosti steklenih izdelkov v skladu s standardom EN 410 ali EN 673. Podaja tudi metodologijo za pravilno uporabo izmerjenih podatkov v računskem orodju.
Področje uporabe tega standarda zajema naslednje značilnosti:
– prehodnost svetlobe (tv)
– odbojnost svetlobe – obe strani (rv, r'v)
– direktna sončna prehodnost (te)
– direktna sončna odbojnost – obe strani (re, r'e)
– celotna prehodnost sončne energije (sončni faktor ali vrednost g) (g)
– toplotna prehodnost (vrednost U) v navpičnem položaju
Naslednje značilnosti ne spadajo na področje uporabe tega standarda:
– prehodnost UV-žarkov (tuv)
– koeficient senčenja (SC)
– splošni indeks barvnega videza (Ra)
– toplotna prehodnost (vrednost U) pod koti, ki niso navpični
General Information
- Status
- Published
- Publication Date
- 09-Apr-2024
- Technical Committee
- CEN/TC 129 - Glass in building
- Drafting Committee
- CEN/TC 129/WG 9 - Light and energy transmission, thermal insulation
- Current Stage
- 6060 - Definitive text made available (DAV) - Publishing
- Start Date
- 10-Apr-2024
- Due Date
- 19-Jun-2024
- Completion Date
- 10-Apr-2024
Overview
EN 17871:2024 is a European standard developed by CEN that specifies the validation procedure for calculation tools used to determine the spectrophotometric and thermal characteristics of glass products in buildings. This standard ensures that software tools calculating key glass properties conform to reliable, consistent methodologies in line with EN 410 and EN 673 standards. It covers the verification of tools used for energy-related glass parameters, offering a trusted process for manufacturers and notified bodies to validate computational methods.
The standard focuses on important spectrophotometric qualities such as light transmittance and reflectance on both sides, solar transmittance and reflectance, solar heat gain coefficient (g value), and thermal transmittance (U value) in vertical orientation, excluding UV transmittance, shading coefficient, and color rendering index.
Key Topics
Scope of Validation
EN 17871:2024 addresses the validation of calculation tools computing glass properties related to energy conservation and heat retention, including:- Light transmittance (tv)
- Light reflectance front and back (rv, r'v)
- Solar direct transmittance (te)
- Solar direct reflectance both sides (re, r'e)
- Total solar energy transmittance (solar factor or g value)
- Thermal transmittance (U value) at vertical orientation
Excluded parameters include UV transmittance, shading coefficient (SC), and general colour rendering index (Ra).
Validation Procedure
The procedure involves comparison of results from the calculation tool under validation with a reference calculation tool managed by the validator (usually a notified body). Key steps include:- Selection of representative glass products (float, tinted, low-e coated, solar control, laminated) for testing
- Validation across various thicknesses and configurations (single, double, triple glazing)
- Agreement on reference data between applicant and validator, with reference spectra available on the Glass for Europe website
- Execution of calculation tasks outlined in Table 1 of the standard to assess the tool’s performance
- Application of strict difference criteria for acceptance of results as per defined tolerances
Defined Test Cases
The standard specifies at least 15 test tasks covering diverse product types and configurations such as:- Uncoated float glass at different thicknesses
- Coated glass variants with different coatings and substrates
- Laminated glass with various interlayer thicknesses and coatings
- Double and triple glazing with different gas fills and cavity widths
This comprehensive set ensures robust validation across typical building glass products.
Normative References
Key related standards referenced include:- EN 410: Determination of luminous and solar characteristics of glazing
- EN 673: Calculation method for thermal transmittance (U value)
- EN 12898: Determination of emissivity relevant to thermal calculations
Applications
EN 17871:2024 plays a critical role in the building glass industry by guaranteeing trusted and uniform results from calculation tools used to declare glass performance. Its practical applications include:
Manufacturer Compliance
Glass manufacturers using calculation software to generate Declaration of Performance (DoP) reports for glazing products ensure their tools meet EN 17871 validation requirements, supporting regulatory compliance under EU Construction Products Regulation (CPR 305/2011).Notified Body Assessment
Notified bodies utilize this standard to verify computation tools submitted by manufacturers, confirming accuracy before certification and DoP issuance.Energy Performance Optimization
Accurate calculation of solar factors and U values facilitates energy-efficient building design by enabling selection of appropriate glazing configurations.Quality Assurance
Building designers, architects, and façade engineers benefit from validated tools to confidently specify glass products with predictable energy and light performance characteristics.Research and Development
Developers of glazing products and software can employ this standard to benchmark and improve their calculation methodologies in alignment with European harmonized standards.
Related Standards
EN 410: Glass in building - Determination of luminous and solar characteristics of glazing
Provides measurement and calculation methods for key optical and solar parameters of glass products.EN 673: Glass in building - Determination of thermal transmittance (U value) - Calculation method
Governs calculation methods for thermal insulation properties of glazing.EN 12898: Glass in building - Determination of emissivity
Specifies measurement of glass emissivity, essential for thermal transmittance computations.EU Regulation 305/2011 (CPR)
Regulates the Declaration of Performance requirements for construction products including building glass.prEN 17940:2023
Addresses thermal conductivity of interlayers in laminated glass, referenced in validation details.
EN 17871:2024 integrates with these standards to provide a complete framework for reliable energy and spectrophotometric characterization of glazing products through validated calculation tools.
Keywords:
EN 17871:2024, glass in building, calculation tool validation, spectrophotometric characteristics, thermal transmittance, light transmittance, solar factor, U value validation, glazing product standards, energy performance glass, CEN standard, glass calculation software validation
Frequently Asked Questions
EN 17871:2024 is a standard published by the European Committee for Standardization (CEN). Its full title is "Glass in building - Spectrophotometric characteristics of glass products - Validation procedure for calculation tool.". This standard covers: 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
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
EN 17871:2024 is classified under the following ICS (International Classification for Standards) categories: 81.040.20 - Glass in building. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 17871:2024 is associated with the following European legislation: EU Directives/Regulations: 305/2011; Standardization Mandates: M/135. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
You can purchase EN 17871:2024 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of CEN standards.
Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2024
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: EN 17871:2024
ICS:
81.040.20 Steklo v gradbeništvu Glass in building
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 17871
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2024
EUROPÄISCHE NORM
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 - Eigenschaften von Glasprodukten -
Procédure de validation des outils de calcul Validierungsverfahren für das Berechnungstool
This European Standard was approved by CEN on 29 January 2024.
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, Türkiye 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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17871:2024 E
worldwide for CEN national Members.
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 tool . 10
4.4 Calculation program to be validated . 10
4.5 Comparison procedure . 10
4.6 Difference criteria . 10
4.7 Calculation tool update validation . 10
4.8 Report content . 11
Bibliography . 12
European foreword
This document (EN 17871:2024) has been prepared by Technical Committee CEN/TC 129 “Glass in
building”, the secretariat of which is held by NBN.
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 October 2024, and conflicting national standards shall
be withdrawn at the latest by October 2024.
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.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations 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, Türkiye and the United
Kingdom.
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, when some characteristics have to be calculated (e.g. U value, g value, …) the
manufacturer undertakes the calculation according to the relevant standards. In this case, the calculation
tool is validated by a notified body who provides a report according to this document.
The purpose of this document 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.
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 tools.
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, Glass in building - Determination of luminous and solar characteristics of glazing
EN 673, Glass in building - Determination of thermal transmittance (U value) - Calculation method
EN 12898, 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 tool for validation
3.2
validator
party that verifies the results of the calculation tool following the procedure described in this document
Note 1 to entry: Within the framework of the EU Regulation 305/2011, the validator is a notified body
4 Validation procedure
4.1 General outline
The applicant shall provide the validator with access to the calculation tool. Results obtained with the
calculation tool to be validated shall be compared by the validator to results obtained with the reference
calculation tool of the validator for defined reference products in accordance with 4.2. The difference
shall not exceed the value specified 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 produ
...
SIST EN 17871:2024 표준은 건축 분야에서 유리 제품의 스펙트로포토메트릭 특성을 평가하고, 이를 기반으로 계산 도구의 검증 절차를 제공합니다. 이 표준의 범위는 EN 410 또는 EN 673의 지침을 따라 유리 제품의 광학적 및 열적 특성을 정확하게 평가하는 데 필수적인 지침을 포함하고 있습니다. 이 표준의 주요 강점 중 하나는 유리의 다양한 스펙트로포토메트릭 특성을 명확히 정의하고 있다는 점입니다. 포함된 특성으로는 조도 전도율(tv), 양측 반사율(rv, r'v), 태양 직통 전도율(te), 태양 직통 반사율(re, r'e), 총 태양 에너지 전도율(g), 수직 위치에서의 열 전도율(U 값) 등이 있습니다. 이와 같이 구체적인 지표들은 건축 설계와 에너지 효율성을 고려하는 데 큰 도움이 됩니다. 또한, 이 표준은 측정된 데이터를 계산 도구에서 올바르게 사용하는 방법론도 제공하여 사용자가 실질적으로 적용 가능한 데이터를 바탕으로 평가를 진행할 수 있도록 합니다. 이는 실무에서의 유용성과 접근성을 높이는 요소로 작용하며, 건축 분야에서의 유리 사용을 보다 신뢰성 있게 하는 데 기여합니다. 한편, 이 표준에서 제외된 특성들은 자외선 투과율(tuv), 차광 계수(SC), 일반 색 재현 지수(Ra), 수직 이외의 각도에서의 열 전도율(U 값)과 같은 것들입니다. 이러한 선정은 표준의 범위를 한정짓고, 특정한 환경에서의 적용을 더욱 명확히 하여 사용자들이 필요한 정보를 쉽게 찾을 수 있도록 돕습니다. 결론적으로, SIST EN 17871:2024는 유리 제품의 스펙트로포토메트릭 특성을 평가하기 위한 신뢰할 수 있는 기준을 제공하며, 건축 분야에서의 유리 사용 방식에 실질적인 영향을 미칠 수 있는 중요한 문서입니다.
La norme SIST EN 17871:2024, intitulée « Verre dans le bâtiment - Caractéristiques spectrophotométriques des produits en verre - Procédure de validation pour l'outil de calcul », propose un cadre essentiel pour garantir l'intégrité des outils de calcul utilisés dans l'évaluation des caractéristiques du verre. Le champ d'application de cette norme est clairement défini, englobant des caractéristiques fondamentales telles que la transmittance lumineuse (tv), la réflectance lumineuse des deux côtés (rv, r'v), ainsi que des paramètres thermiques cruciaux comme la transmittance thermique (valeur U) en position verticale. L'une des forces majeures de cette norme est sa méthodologie rigoureuse pour l'utilisation des données mesurées dans l'outil de calcul, ce qui assure une précision et une fiabilité dans les résultats obtenus. En intégrant des éléments comme la transmittance directe solaire (te) et le facteur solaire total (g), cette norme répond aux besoins croissants de l'industrie du bâtiment en matière d'efficacité énergétique et de performances des matériaux. De plus, la procédure de validation pour l'outil de calcul est d'une grande pertinence dans le contexte actuel où les exigences réglementaires et les attentes en matière de durabilité sont en constante évolution. En excluant des caractéristiques telles que la transmittance UV (tuv) et l'indice de rendu des couleurs (Ra), la norme se concentre sur les aspects les plus significatifs pour la conception et l'analyse des systèmes de vitrage, ce qui lui confère une applicabilité précise. Dans l'ensemble, la norme SIST EN 17871:2024 constitue un document de référence indispensable pour les professionnels du bâtiment, garantissant des résultats fiables et cohérents dans l'évaluation des caractéristiques des produits en verre, tout en répondant aux enjeux contemporains liés à l'efficacité thermique et à l'utilisation optimale de la lumière dans les constructions modernes.
Die Norm EN 17871:2024 bietet präzise Vorgaben zur Validierung eines Berechnungstools, das sich auf die spektrophotometrischen und thermischen Eigenschaften von Glasprodukten konzentriert. Der Anwendungsbereich dieser Norm ist sowohl für Hersteller als auch für Planer von Bedeutung, da er die korrekte Anwendung und Auswertung von gemessenen Daten für Glasprodukte gemäß EN 410 oder EN 673 definiert. Ein wesentlicher Stärke der Norm EN 17871:2024 ist die klare Strukturierung der zu bewertenden Eigenschaften. Dazu gehören die Lichttransmission (tv), Lichtreflexion beider Seiten (rv, r'v), die direkte solare Transmission (te), die direkte solare Reflexion beider Seiten (re, r'e), der gesamte solarenergiewert (solar factor oder g-Wert) und die thermische Transmission (U-Wert) in vertikaler Position. Dies ermöglicht eine umfassende Analyse und Bewertung der Parameter, die für die energetische Effizienz und den visuellen Komfort von Gebäuden entscheidend sind. Darüber hinaus adressiert die Norm die Methodik zur richtigen Nutzung der gemessenen Daten in dem Berechnungstool, was zu konsistenten und verlässlichen Ergebnissen führt. Dies ist besonders relevant in Anbetracht der steigenden Anforderungen an die Energieeffizienz in der Bauindustrie. Allerdings schließt die Norm einige spezifische Merkmale von der Bewertung aus, darunter die UV-Transmission (tuv), den Schattierungskoeffizienten (SC), den allgemeinen Farbwiedergabeindex (Ra) sowie die thermische Transmission (U-Wert) bei anderen Winkeln als vertikal. Diese Einschränkungen sollten Anwender beachten, um Missverständnisse zu vermeiden und sicherzustellen, dass alle relevanten Faktoren in anderen Normen oder ergänzenden Berechnungstools berücksichtigt werden. Die EN 17871:2024 ist somit ein unverzichtbares Dokument für Fachleute, die in der Architektur und im Bauwesen tätig sind, da es eine solide Grundlage für die Analyse der spektrophotometrischen Eigenschaften von Glasprodukten bietet. Die Relevanz dieser Norm ist besonders in einem Zeitalter des wachsenden Bewusstseins für Nachhaltigkeit und Energieeffizienz evident, da sie es ermöglicht, informierte Entscheidungen hinsichtlich der Materialauswahl und -anwendung zu treffen.
標準SIST EN 17871:2024は、建築用ガラスの分光特性に関する重要な手続きを確立しています。この標準は、ガラス製品の分光測定および熱的特性を評価するための計算ツールの検証手順を提供しており、特にEN 410またはEN 673に準拠しています。標準の範囲には、光透過率（tv）、光反射率（rv、r'v）、太陽直接透過率（te）、太陽直接反射率（re、r'e）、総太陽エネルギー透過率（g値または太陽因子）、および垂直位置での熱透過率（U値）が含まれています。 この標準の強みは、計算ツールの適切な使用についての方法論を提供している点にあります。これにより、測定データを計算ツールで正しく活用することが可能となります。また、標準は特定のガラス製品に関する重要な性能指標をカバーしており、業界の専門家が製品の性能を正確に評価するための基盤を提供します。 ただし、標準の範囲には、UV透過率（tuv）、遮光係数（SC）、一般的な色再現指数（Ra）、および垂直以外の角度での熱透過率（U値）は含まれていません。この明確な範囲設定によって、標準は特定の用途に焦点を合わせることができ、その結果、業界での関連性が高まっています。 SIST EN 17871:2024は、現代の建築におけるガラスの利用において重要な役割を果たす期待がされ、多様なテストおよび評価手法の指針として広く受け入れられることでしょう。そのため、この標準は業界内での技術的進歩を支える重要な文書となるといえます。
The standard EN 17871:2024 presents a comprehensive and essential validation procedure specifically designed for calculating the spectrophotometric and thermal characteristics of glass products. This document delineates a clear methodology for ensuring the accuracy and reliability of the calculation tools that comply with existing standards such as EN 410 and EN 673. One of the key strengths of this standard lies in its focus on critical characteristics of glass products, including light transmittance (tv), light reflectance for both sides (rv, r'v), and solar direct transmittance (te). The inclusion of solar direct reflectance (re, r'e) and the total solar energy transmittance, commonly referred to as the solar factor or g value (g), demonstrates the standard's relevance in addressing various functional aspects of glass in building applications. The incorporation of thermal transmittance (U value) in vertical positioning further highlights the standard's applicability in real-world scenarios, assisting manufacturers and builders in achieving energy-efficient designs. The standard also provides clear guidance on the correct use of measured data, ensuring that practitioners can confidently apply these values within the calculation tool, which is fundamental in achieving accurate performance assessments. By standardizing these processes, EN 17871:2024 aids in reducing discrepancies that might arise due to inconsistent measurement or calculation methodologies across the industry. While the scope covers essential characteristics, it is noteworthy that certain elements such as UV transmittance (tuv), shading coefficient (SC), general colour rendering index (Ra), and thermal transmittance (U value) at angles other than vertical are explicitly excluded. This clarity helps users understand the limitations of the standard while focusing on its intended applications. In summary, EN 17871:2024 stands out as a vital resource for the glass in building sector, facilitating standardized validation procedures that underpin the calculation tools crucial for evaluating the spectrophotometric and thermal performance of glass products. Its focused scope and methodological clarity reinforce its relevance in promoting energy efficiency and regulatory compliance in building design.
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