JC/T 2450-2018Glass used in the transparent part of passive building (English PDF)

4.1 Categories

Products are divided into single-cavity or multi-cavity insulating glass, vacuum composite insulating glass, etc., according to their structure.

4.2 Specifications

Please refer to Appendix B for the glass specifications, structure, thickness of the transparent part of the passive building.

7.1 The test methods for appearance quality, dimensional deviation, dew point, initial

gas content, ultraviolet radiation resistance, water vapor sealing durability, gas sealing durability shall be carried out in accordance with the provisions of GB/T 11944.The test method for vacuum glass properties that constitute vacuum composite insulating glass shall be carried out in accordance with the provisions of JC/T 1079.

7.2 The K value of insulating glass is calculated according to JGJ/T 151.The boundary conditions for calculating the K value of vacuum composite insulating glass are selected according to JGJ/T 151.The calculation method shall be according to JGJ 113.The thermal conductivity of the support is calculated according to Appendix D of this standard.

7.3 The test of glass spectrum and the calculation of visible light transmittance tauv are in accordance with the provisions of GB/T 2680.

7.4 The total solar energy transmittance g is calculated according to JGJ/T 151.

7.5 The total solar infrared heat transmittance gIR is calculated according to Appendix

E of this standard.

7.6 Light to solar gain ratio LSG is the ratio of visible light transmittance tauv and total solar energy transmittance g, that is, LSG = tauv/g.

8.1 Inspection classification

8.1.1 Exit-factory inspection

Exit-factory inspection includes appearance quality, dimensional deviation, dew point, and initial gas content.

8.1.2 Type inspection

Type inspection includes all inspection items required by the technology. Type inspection shall be carried out under any of the following circumstances.

a) During the production process, if there are major changes in structure, materials, processes, which may affect product performance;

b) During normal production, periodic inspections shall be carried out regularly or products will be judged to be unqualified.

8.3.2 Dew point

Take 15 specimens for dew point testing. If all are qualified, the performance will be deemed qualified.

8.3.3 Resistance to ultraviolet radiation

Take 2 specimens for ultraviolet radiation resistance test. If both specimens are qualified, the performance is deemed to be qualified.

8.3.4 Water vapor sealing durability

Take 5 specimens for the water vapor sealing durability test. If the moisture permeability index is all qualified, the performance is deemed to be qualified.

8.3.5 Initial gas content

Take 3 specimens for initial gas content test. If all 3 specimens are qualified, the performance is deemed to be qualified.

8.3.6 Gas sealing durability

Take 3 specimens for the gas sealing durability test. If all 3 specimens are qualified, the performance is deemed to be qualified.

8.3.7 Heat transfer coefficient K

Take one specimen and test its heat transfer coefficient K value. If one specimen is qualified, the performance is deemed to be qualified.

8.3.8 Visible light transmittance tauv

Take 3 specimens for the visible light transmittance tauv test. If all 3 specimens are qualified, the performance is deemed to be qualified.

8.3.9 Total solar energy transmittance g

Take 3 specimens for the test of total solar energy transmittance g. If all 3 specimens are qualified, the performance is deemed to be qualified.

8.3.10 Total solar infrared heat transmittance gIR

Take 3 specimens to conduct the test of total solar infrared heat transmittance gIR. If all

3 specimens are qualified, the performance is deemed to be qualified.

8.3.11 Light to solar gain ratio LSG

Appendix A (Informative)

Introduction to the characteristics and general indicators of passive building

A.1 The origin and characteristics of passive building

The word "passive building" is translated from the German PASSIVEHAUS. It refers to the construction of low energy consumption housing buildings, by combining various passive energy-saving means such as natural ventilation, natural lighting, solar radiation and indoor non-heating heat sources, etc., with the high-efficiency energy-saving technology of the building envelope. Whilst significantly improving the comfort of the indoor environment, passive buildings can significantly reduce building energy consumption and minimize reliance on active mechanical heating and cooling systems.

A.2 Indoor comfort index of passive building

Passive buildings are highly comfortable, healthy, environmentally friendly houses. The indoor environment shall meet.

a) Indoor temperature 20 °C ~ 26 °C;

b) Indoor relative humidity 40% ~ 60%;

c) Over-temperature frequency <= 10%;

d) Indoor carbon dioxide content <= 1000 ppm;

e) The temperature difference between the inner surface of the indoor side of the building envelope is <= 3 °C;

f) There is no condensation on the indoor side of doors and windows;

g) The sound insulation and noise reduction effect is good; the noise decibel in functional rooms, living rooms, bedrooms is <= 30 dB.

A.3 Main energy efficiency indicators of passive building

Passive building energy efficiency indicators based on cold regions in Germany and

China include.

a) Annual heating (cooling) demand per unit area <= 15 kWh/(m2 · a);

b) Total secondary energy demand (including heating, cooling, ventilation, lighting, hot water, auxiliary energy, household appliances) <= 120 kWh (m2 · a);

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