T/XJBX 0179-2026 Active Group standards

T/XJBX 0179-2026 The technical specifications for the detection of light transmittance and heat transfer coefficient of energy-saving glass in architecture

Publish Date: 2026-02-01 Implement Date: 2026-03-24 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: T/XJBX 0179-2026

Standard Type: Group standards

Standard Status: Active

is_force_gb: no

CCS Name: Medical devices

ICS Name: Building glass

Publish Date: 2026-02-01

Implement Date: 2026-03-24

Scope

As an important component of building envelopes, the thermal and optical performance of energy-saving glass, such as its visible light transmittance and heat transfer coefficient, directly affects building lighting quality, air conditioning loads, thermal comfort levels, and energy consumption performance throughout its lifecycle. With the promotion and application of green buildings, near-zero energy buildings, and energy-saving renovations of existing buildings, energy-saving glass products have become increasingly diverse, including single-pane glass, insulated glass, laminated glass, vacuum glass, Low-E coated glass, and multifunctional composite glass. However, different structures and coating systems of energy-saving glass exhibit significant differences in light transmission, shading performance, heat transfer performance, and their stability under environmental conditions. Moreover, the test results directly impact product selection, project acceptance, energy consumption calculations, and quality arbitration. Therefore, establishing unified technical requirements for light transmittance and heat transfer coefficient testing is of practical necessity to ensure the accuracy, comparability, and traceability of testing results. At present, there are still issues in engineering applications and testing practices, such as inconsistent sample preparation and conditioning, differences in test conditions and boundary conditions, insufficient instrument calibration and uncertainty evaluation, and inconsistent data processing and reporting standards. These issues often lead to significant discrepancies in test results for the same product across different institutions, affecting project decision-making and quality control. Particularly for products with coated glass, inflated insulated glass, vacuum glass, and multi-cavity structures, their complex heat transfer paths and pronounced edge effects impose higher demands on the stability, sealing, and temperature field c