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GB/T 42786-2023Graduation and test methods on thermal comfort and visual comfort of building shading (English PDF)

建筑遮阳热舒适、视觉舒适性能分级及检测方法

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

August 6, 2023

Implementation date

March 1, 2024

Scope

GB/T 42786-2023 is the English-translated version of 建筑遮阳热舒适、视觉舒适性能分级及检测方法.

GB/T 42786-2023 is the Chinese standard "Graduation and test methods on thermal comfort and visual comfort of building shading".

Its scope clause reads: This document specifies the classification of thermal comfort and visual comfort performance of building shading, testing and calculation of optical parameters of shading materials, thermal comfort, visual comfort Sensory comfort performance test and calculation and test report.

This document is applicable to the classification and testing of thermal comfort and visual comfort performance of building sunshade products. This document does not apply to materials with fluorescent or Sunshade products made of materials with retroreflective properties.

Its clauses include normative reference documents; terms, definitions and symbols.

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Document preview — GB/T 42786-2023

National Standard of the People's Republic of China

ICS: 91.010.30
Classification: P04

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Preface
1 Scope
2 Normative reference documents
3 Terms and definitions, symbols
4 rating
5 Test and calculation of optical parameters of sunshade materials
6 Thermal comfort and visual comfort performance testing and calculation
7 Test Report
Appendix A (normative) Double-beam spectrophotometer spectrum and accuracy
Appendix C (informative) The total solar transmittance gtot classification of the combination is recommended
Appendix E (Normative) Reference Glass
Appendix F (informative) Recommended inner surface temperature of light-transmitting enclosure
Appendix G (Normative) Opacity Performance Tester
Appendix H (informative) Calculation of optical performance related to sunshade products with adjustable blade angle

1 Scope

This document specifies the classification of thermal comfort and visual comfort performance of building shading, testing and calculation of optical parameters of shading materials, thermal comfort, visual comfort

Sensory comfort performance test and calculation and test report.

Sunshade products made of materials with retroreflective properties.

2 Normative reference documents

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations

For undated referenced documents, only the version corresponding to the date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document.

GB/T 2680 Architectural glass visible light transmittance, direct sunlight transmittance, total solar energy transmittance, ultraviolet transmittance and visible light transmittance

Determination of window glass parameters

GB/T 11976 Lighting performance classification and detection methods of building exterior windows

GB/T 30592 Testing method for solar heat gain coefficient of light-transmitting envelope structures

JGJ/T 151 Thermal calculation procedures for building doors, windows and glass curtain walls

JG/T 274 General technical requirements for building sunshade

JG/T 281 Test method for thermal insulation performance of building sunshade products

JG/T 440 Testing method for shading performance of building doors and windows

3 Terms, definitions and symbols

3.1 Terms and definitions

The terms and definitions defined in JGJ/T 151, JG/T 274 and the following apply to this document.

3.1.1 Thermal comfort

The thermal comfort performance of building shading mainly includes solar heat gain control performance, secondary heat gain control performance and direct transmission protection performance.

3.1.2 Solar gain control performance

When the sunshade product is fully extended and closed, it can reduce the building's cooling load in summer by reducing indoor solar heat gain. Evaluation parameters is the total solar transmittance.

3.1.3

The ratio of heat gain from solar radiation entering the room through the light-transmitting enclosure structure to the amount of incident solar radiation.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 59 pages — is available in the English PDF.

Referenced standards

Normative references

Similar standards

GB 38031-2025|GB/T42786-2023|GB/T 1.1-2020|GB/T 2680|GB/T 11976|GB/T 30592|GB/T 51366|GB/T 50353

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