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GB/T 22476-2008: Calculation and determination of steady-state U values (thermal transmittance) of multiple glazing
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| GB/T 22476-2008 | English | 439 |
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Calculation and determination of steady-state U values (thermal transmittance) of multiple glazing
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GB/T 22476-2008
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Basic data | Standard ID | GB/T 22476-2008 (GB/T22476-2008) | | Description (Translated English) | Calculation and determination of steady-state U values (thermal transmittance) of multiple glazing | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | Q33 | | Classification of International Standard | 81.040 | | Word Count Estimation | 19,169 | | Date of Issue | 2008-11-04 | | Date of Implementation | 2009-06-01 | | Quoted Standard | GB/T 8170; GB/T 10294; GB/T 10295 | | Adopted Standard | ISO 10291-1994, MOD; ISO 10292-1994, MOD; ISO 10293-1997, MOD | | Regulation (derived from) | National Standard Approval Announcement 2008 No.18 (Total No.131) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the following three methods of insulating glass U-value calculation and determination of the steady state. This standard applies to flat glass, flat double-or multi-layer hollow glass coated glass or other material, apply to exterior pieces are hollow glass through far infrared materials. This standard specifies test methods for measuring only the central region of the insulating glass U-value, regardless of edge effect and solar radiation. U-value of available flat surface of hollow glass hollow glass calculations and determined in the same structure. | GB/T 22476-2008: Calculation and determination of steady-state U values (thermal transmittance) of multiple glazing
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Calculation and determination of steady-state U values \u200b\u200b(thermal transmittance) of multiple glazing
ICS 81.040
Q33
National Standards of People's Republic of China
IG steady state value U
Calculation (heat transfer coefficient) and Determination
[ISO 10291.1994, Glassinbuilding-Determinationof
steady-stateUvalues \u200b\u200b(thermaltransmittance) ofmultipleglazing-
Guardedhotplatemethod; ISO 10292.1994, Glassinbuilding-
Calculationofsteady-stateUvalues \u200b\u200b(thermaltransmittance) of
multipleglazing; ISO 10293.1997, Glassinbuilding-Determinationof
steady-stateUvalues \u200b\u200b(thermaltransmittance) ofmultipleglazing-
Heatflowmetermethod, MOD]
Posted 2009-06-01 2008-11-04 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This revised standard adopts ISO 10291 "Glass in building --- U values \u200b\u200bIG steady state (heat transfer coefficient) measurement --- Protection
Hot plate ", ISO 10292" Glass in building --- U values \u200b\u200bIG steady state (heat transfer coefficient) calculation ", ISO 10293" Building Glass
U values \u200b\u200b--- glass insulating glass steady state (heat transfer coefficient) measurement --- heat flow meter method. "
This standard is based on ISO 10291, ISO 10292, ISO 10293 redrafted.
The standard lists the reg number and ISO 10291 Appendix C, ISO 10292, ISO 10293 reg control list numbered.
Taking into account China's national conditions, in the use of ISO 10291, ISO 10292, ISO 10293, the standard this made some changes. For technical difference
Iso been incorporated into the body and they are involved in terms of the margin of a single vertical line identification. These techniques are given in Appendix D
List of differences and the reasons for the reference.
For ease of use, this standard made the following editorial changes.
--- "This International Standard" be replaced by "this standard";
"." --- With a decimal point instead of a comma as the decimal point, "";
--- Delete international standards foreword.
This standard Annex A, Annex B is normative appendix, Appendix C, Appendix D is an informative annex.
The standard proposed by China Building Materials Federation.
This standard by the National Standardization Technical Committee centralized building glass.
This standard is drafted by. National Glass Quality Supervision and Inspection Center.
Participated in the drafting of this standard. Guangdong Golden Glass Technologies Limited, Zhejiang Zhongli Group Holdings Ltd., Xinyi Glazier
Cheng (Dongguan) Co., Ltd., China Southern Glass Group, Chengdu Tongda Technology Glass Co., Ltd., Dongying Sheng-ming Glass Co., Ltd., Jiangsu Province, to build
Building Research Institute Co., Ltd. Shanghai Hao crystal glass.
The main drafters of this standard. Li Yong, Ji Wei book, HUANG Jian-bin, Xiang Wang, MEDICAL AND Li Da, Jiang Meiqin Wu from true.
Introduction
Insulating glass U-value (heat transfer coefficient) is used to transfer heat insulating glass characterization, determining the value of U can be obtained by the thermal resistance test,
It can also be calculated by emissivity glass after the test.
This standard contains three methods about three ISO standard U-value measurements and calculations. Testing may use any of the standard method
Insulating glass U value were measured. But U values \u200b\u200busing different methods derived there may be some differences, this is because the test system
There is an error caused, so the test results, the method used should be marked.
IG steady state value U
Calculation (heat transfer coefficient) and Determination
1 Scope
This standard specifies three methods of insulating glass U-value under steady state (heat transfer coefficient) calculation and measurement.
This standard applies to the flat glass (including embossed, cast glass), double-coated flat glass or other materials or multilayered hollow
Glass, does not apply to the outer sheet is a hollow glass through far-infrared material. Test methods specified in this standard measure only the central hollow glass
U-value (heat transfer coefficient) region, regardless of the edge effect and the influence of solar radiation. U value of the insulating glass surface of the same structure can be used flat
IG calculation and determination.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
GB/T 8170 numerical rounding rules
GB/T 10294 insulation steady thermal resistance and related properties - Guarded hot plate method
GB/T 10295 insulation steady thermal resistance and related properties - Heat flow meter method
3 Terms and Definitions
The following terms and definitions apply to this standard.
3.1
Insulating glass U-value (heat transfer coefficient) is defined under steady state conditions, the central region of hollow glass, edge effect is not considered, the two outer surfaces of the glass
Per unit time, unit temperature difference by heat per unit area, in units of W/(m2 · K).
4 Symbol
Symbols Table 1 of this standard referenced in Table 2.
Table 1
Symbol Name Unit
N u
Rn
constant
Gas heat capacity
Glass thickness (or a substitute material for glass)
Grashof registration number
Surface heat transfer coefficient
Thermal conductivity
Spacer layers
Nusselt dimensionless number
Prang authorized number
Glass (glass or alternative materials) thermal resistivity
Standard reflectance
Gas spacer layer thickness
J/(kg · K)
Dimensionless
W/(m2 · K)
W/(m2 · K)
Dimensionless
Dimensionless
m · K/W
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